NIWOT: Logbook Entries

NIWOT: bowling Messages: 11 Entries..

Return to Logbook Contents Page
Entry Date Title Site Author #Graphics
88 Tue 22-Jul-2003laser switched to new UPS (APC 1500 VA)lasersburns
87 Tue 22-Jul-2003TGA software upgrade to ver 5.06lasersburns
86 Tue 22-Jul-2003Procedure to check laser alignment (from Steve Sargent)lasersburns
76 Thu 10-Jul-2003Laser Data Download -- July 10thlasersburns
73 Tue 08-Jul-2003Laser Data Download -- July 8thlasersburns
71 Tue 08-Jul-2003Laser Data Table (Add updates here!)lasersburns
70 Mon 07-Jul-2003NOte: Laser Data giving ZERO.nonesburns
69 Mon 07-Jul-2003Note: Laser Data clippednonesburns
68 Mon 07-Jul-2003Procedure for Downloading/Checking the Laser (TGA).lasersburns
37 Wed 21-May-2003Talk with Dave Bowling (May 21, 2003)nonesburns
36 Wed 21-May-2003Plan from Dave Bowling (email from April)nonesburns


88: bowling, Site laser, Tue 22-Jul-2003 12:34:39 MDT, laser switched to new UPS (APC 1500 VA)
On Monday July 21, 2003 the UPS for the laser was switched (need to get
exact UPS model number).

The software for the UPS was not installed since we didn't want it to
interfere with the laser software.  There are some usb ports which could
be used to install the monitor the UPS with the laser PC.  All cables and
documentation for the UPS are in the tent.


87: bowling, Site laser, Tue 22-Jul-2003 12:32:15 MDT, TGA software upgrade to ver 5.06
The TGA software was upgraded at around Noon on Friday, July 18th 2003.

The files which were replaced were:

     File:  TGA.EXE
     Date:  18 Jul 2003, 7:38
     Size:  168576 bytes.
     Type:  PCEXE

     File:  TGA.OVR
     Date:  18 Jul 2003, 7:38
     Size:  49438 bytes.

These are on the C: drive in C:\tga\

old files are backed up in C:\tga_505\

86: bowling, Site laser, Tue 22-Jul-2003 12:28:26 MDT, Procedure to check laser alignment (from Steve Sargent)
Date:    Fri, 18 Jul 2003 08:22:41 MDT
To:      "Sean Burns" 
cc:      aturnip@stripe.colorado.edu, turnip@ucar.edu,
         dave Bowling 
From:    ssargent@campbellsci.com
Subject: TGA software update

Hi Sean,

Sorry this TGA is turning into such a pain to keep it running. I have 
attached two files, tga.exe and tga.ovr. These are a new version of 
the software that I hope will auto restart more reliably.

To install this new version, first, please save a backup of your 
current version, i.e. make a directory "c:\tga_505" and copy the 
entire contents of director c:\tga into it. Then just replace tga.exe 
and tga.ovr in the c:\tga directory with the new versions. 

This won't solve the real problem (the crashes), but I hope it will 
avoid the program setting the DC current and ramp B offset to 1, 
which is now preventing the automatic startup.

Thanks for wrapping the sample cell - I am anxious to see some new 
data to see if this will make the calibration more constant. You 
expressed some concern that this may have disturbed the alignment. To 
check this: 
1) adjust the DC current so that you are NOT on the absorption line, 
(start ON the normal line, then increase the DC current 1 or 2 mA)
2) Temporarily change the display in graph 1 to "ref det sig" and 
graph 2 to "smp det sig". What are these values? These are the raw 
detector signals, an indication of the optical alignment.
3) go back to the normal mode. 
4) In the parameter column, select the SMPL Gain (#6) and see what it 
shows - it should be "0 A", indicating it is in gain 0 (the lowest 
gain) and under automatic control. Repeat for "REF Gain" (#9) - it 
should also be "0 A".

I have appended below my notes on what I see in the data - a few more 
glitches, consistent with what I have seen before. Also - it looks 
like the pressure is a tiny bit higher for cal tank 2. If this trend 
continues, we may need to ask you to readjust this.

Thanks for all your efforts there!

Steve


6 July 10:51: manual start, file 07061051
6 July 10:56:42: error 8 (restarted successfully)

6 July 11:01:10 auto restart, file 07061101
glitches at:
6 July 18:28:34
7 July 07:39:30
7 July 12:43:03: error 7 (restarted successfully)

7 July 12:45:45: auto restart, file 07071245
7 July 16:39:50: error 8 (NO restart - DC current 1 mA)

8 July 10:12:19 manual restart, file 07081012
glitches at:
8 July 10:23:25
9 July 00:48:28
9 July 13:26:13
10 July 04:23:47 error 8 (NO restart - DC current 1 mA)

10 July 10:15:36 manual restart, file 07101015
glitches at:
10 July 17:32:19
11 July 07:44:43
11 July 19:57:56
12 July 10:01:37
12 July 23:51:54 (second glitch 90 sec later)
13 July 16:05:03
14 July 00:59:59: error 7 
14 July 01:03:26 auto restart, file 07140103
glitch at 
14 July 5:48:22
14 July 10:36 stopped TGA to get data

14 July 11:12:13  manual restart, file 07141112
glitches at:
14 July 22:22:19
15 July 12:17:14 (second glitch 163 sec later)
15 July 15:41:08 (this glitch goes up, not down - may be something 
else)
16 July 00:58:26: error 8 (NO restart)
The pressure in cal tank 2 seems a little bit (~0.06 mbar) too high. 
May need to readjust cal tank pressures soon.



76: bowling, Site laser, Thu 10-Jul-2003 17:06:21 MDT, Laser Data Download -- July 10th
Date:    Thu, 10 Jul 2003 12:34:24 MDT
To:      Dave Bowling , ssargent@campbellsci.com
cc:      sean.burns@Colorado.EDU, aturnip@stripe.colorado.edu, turnip@ucar.edu
From:    "Sean Burns" 
Subject: Re: flat-line... 

Return-Path: Sean.Burns@Colorado.EDU
Delivery-Date: Thu Jul 10 12:35:17 2003
In-Reply-To: Your message of "10 Jul 2003 10:12:43 MDT."
         <3140676749bowling@biology.utah.edu> 
Content-Length: 2123


Dave/Steve,

I put the data files on the web...they are in:

 http://urquell.colorado.edu/bowling/data_laser/

i put all the files in a single tar file, tga_030710.tar (less
clicking for you to download)...i think most PCs (windows and unix)
can deal with tar files.  if you prefer having every file individually
let me know and I'll do it that way instead.  the files in the tar
file are:

 tar -tvf tga_030710.tar 
 -r-xr-xr-x   0/3      14395 Jul  8 16:48 2003 07080948.12c
 -r-xr-xr-x   0/3        308 Jul  8 16:48 2003 07080948.hdr
 -r-xr-xr-x   0/3        168 Jul  8 16:48 2003 07080948.sm
 -r-xr-xr-x   0/3      14395 Jul  8 17:12 2003 07081012.12c
 -r-xr-xr-x   0/3   30372620 Jul 10 11:23 2003 07081012.dat
 -r-xr-xr-x   0/3        424 Jul 10 11:23 2003 07081012.hdr
 -r-xr-xr-x   0/3     892248 Jul 10 11:23 2003 07081012.sm

The laser appears to be running fine again (after resetting it).  The
problem which stopped the data collection was the same as that from 2
days ago---the DC current and rampB offset were both 1 mA.  Does
something happen which causes the DC current and rampB offset to go to
1 mA?  ie, Is this a symptom of a different problem, or is this the
problem itself??  anyway, if there is anything you want me to try let
me know...

Dave, I'll put the 2 CDs I've burned so far in the robot flask
suitcase.

I'm going out to switch the East Robot flasks so if you want me to try
anything with the laser let me know and i'll check my e-mail again in
about 1-2 hours. . .

                                                SpB.



 > Thanks Sean.  Steve, assuming this is the same issue - how hard
would it be to revamp the software so that it is a bit more
conservative with turning off the laser current?  Maybe something like
"if the laser temp appears too high, wait a minute, check again, if
it's still too high, then turn it off"?  Or something like that.
 > DB
 > 
 > On 7/10/2003 8:09 AM, Sean Burns  wrote:
 > >
 > >Steve/Dave,
 > >
 > >fyi:  laser signals look like zeros this AM.  I'm on my
 > >way up there.  Should have a data file for you in
 > >a few hours.
 > >
 > >
 > >                            SpB.
 > >
 > >

73: bowling, Site laser, Tue 08-Jul-2003 16:54:39 MDT, Laser Data Download -- July 8th
Date:    Tue, 08 Jul 2003 11:04:47 MDT
To:      bowling@biology.utah.edu, ssargent@campbellsci.com,
         Russell.Monson@Colorado.EDU, aturnip@stripe.colorado.edu, turnip@ucar.edu
cc:      sean.burns@Colorado.EDU
From:    "Sean Burns" 
Subject: Laser back up and running...

Hi Dave/Steve,

The laser is up and running again.  The problem was that the "DC
current" and "Ramp B Offset" were both at 1.  I showed Brant how to
refill the Dewar and how to reset everything following the instruction
sheet.  We now have 2 dewars which will make refilling much easier
(We'll leave one dewar down at the tank on our way out today).

Since the laser instruction sheet is so clearly laid out we could
probably train everyone up here how to reset the laser. . .I guess we
can wait and see how often these crashes happen.  Also, I can stay
logged into russter and leave cockpit running so when people are up
here they can easily check the laser time series to make sure it is
running properly (or not).  I guess it depends how much extra time
people have to do this...

The files I downloaded from the PC are:

-r-xr-xr-x   1 root     sys        14395 Jul  6 17:47 07061047.12c*
-r-xr-xr-x   1 root     sys          308 Jul  6 17:47 07061047.hdr*
-r-xr-xr-x   1 root     sys          168 Jul  6 17:47 07061047.sm*
-r-xr-xr-x   1 root     sys        14395 Jul  6 17:51 07061051.12c*
-r-xr-xr-x   1 root     sys        59000 Jul  6 17:56 07061051.dat*
-r-xr-xr-x   1 root     sys          454 Jul  6 17:56 07061051.hdr*
-r-xr-xr-x   1 root     sys          168 Jul  6 17:56 07061051.sm*
-r-xr-xr-x   1 root     sys        14395 Jul  6 18:01 07061101.12c*
-r-xr-xr-x   1 root     sys      18498480 Jul  7 19:43 07061101.dat*
-r-xr-xr-x   1 root     sys          634 Jul  7 19:43 07061101.hdr*
-r-xr-xr-x   1 root     sys       543912 Jul  7 19:43 07061101.sm*
-r-xr-xr-x   1 root     sys        14395 Jul  7 19:46 07071246.12c*
-r-xr-xr-x   1 root     sys      2802560 Jul  7 23:39 07071246.dat*
-r-xr-xr-x   1 root     sys          423 Jul  7 23:39 07071246.hdr*
-r-xr-xr-x   1 root     sys        80880 Jul  7 23:39 07071246.sm*

it looks like it kept writing data files till about 23:39
yesterday..but maybe that is UTC time??...I'm also a little curious
why the file name is 07071246.*....that would be yesterday at 12:46?
Does this mean the data-stystem restarted at that time yesterday (this
would explain the clipping I saw in cockpit)?

I put these data on the web at:

 http://urquell.colorado.edu/bowling/data_laser/

If you have any other questions or something else I can check on just
let me know...I'll put the information from the data sheet in the
logbook later today.


                                        SpB.


71: bowling, Site laser, Tue 08-Jul-2003 14:26:28 MDT, Laser Data Table (Add updates here!)
This is a table to document the status of the laser.  The information
in this table is also recorded on data sheets available from Dave Bowling.

                                                                                                      TGA         Percent Transmittance
                    Time        Graph1      Graph2      LaserT     RefDetT    SmpDetT   Pressure    Analog Chan1     Ref A      Ref B     DC Current   DC "A"     Ramp B      RampB "A"
Date  Initials  Watch  TGA   12C [300 600] 13C [3 6]  arr.  lve   arr.  lve  arr. lve  arr.  lve    arr.  lve     arr.  lve   arr.  lve   arr.  lve    arr/lve  arr.   lve    arr/lve
----  --------  ----- -----  ---  ---      ---  ---   ----  ----  ---- ----  ---- ---  ----- ----   ----- -----   ----  ----  ----  ----  ----- -----  --- ---  ------ ------ --- ---
9/30   SpB      10:29 10:33  ok    ok      ok   ok    82.5   -    -10    -   -20   -   16.3   --    2.030  --     55.6   --   60.1   --   497.3  --     Y   -   10.618   --    Y   -
9/26   SpB   ----....didn't shutdown the system...see notes below----
9/23   SpB   ----....didn't shutdown the system...see notes below----
9/19   SpB      10:48 10:50  ok    ok      ok   ok    82.5  82.5  -10   -10  -20  -20  16.2  17.3   2.037 2.029   55.5  54.2  59.8  58.9  497.5 497.6   Y   Y   10.635 10.633  Y   Y
9/15   SpB      14:05 14:06 ok     ok      ok   ok    82.5  82.5  -10   -10  -20  -20  17.6  17.15  2.029 2.029   54.3  54.6  58.9  59.2  497.5 497.6   Y   Y   10.659 10.648  Y   Y
9/9    SpB      10:39 10:39 ok     ok      ok   ok     --   82.5   --   -10  ---  -20  ----  17.21  ----- 2.031   ----  55.2  ----  59.5  ----- 498.0   N   Y   ------ 10.660  N   Y
9/2    SpB      10:27 10:31 ok     ok      ok   ok    82.5  82.5  -10   -10  -20  -20  16.4  17.10  2.030 2.030   53.6  54.6  58.2  59.2  497.6 497.9   Y   Y   10.684 10.672  Y   Y
8/29   SpB   ----....didn't shutdown the system...see notes below----
8/25   SpB      11:27 11:28 ok     ok      ok   ok    82.5  82.5  -10   -10  -20  -20  16.2  16.10  2.029 2.029   55.4  53.5  59.9  58.0  497.8 497.97  Y   Y   10.693 10.690  Y   Y
8/20   SpB 12:07:22  12:14:00 ok   ok      ok   ok    82.5  82.5  -10   -10  -20  -20  17.1  17.75  2.028 2.028   54.3  53.4  59.0  58.2  497.7 497.92  Y   Y   10.728 10.727  Y   Y
8/15   SpB      11:20 11:26  ok    ok      ok   ok    82.5  82.5  -10   -10  -20  -20  16.3  17.30  2.028 2.028   54.2  54.0  58.7  58.6  497.9 498.03  Y   Y   10.75  10.72   Y   Y
8/13    AT      10:49 10:54  ok    ok      ok   ok    82.5  82.5  -10   -10  -20  -20  16.67 16.78  2.028 2.027   54.5  54.5  59.1  58.9  497.8 498.04  Y   Y   10.754 10.734  Y   Y
8/6     AT      10:38 10:41  ok    ok      ok   ok    82.5  82.5  -10   -10  -20  -20  17.20 17.41  2.029 2.028   53.6  53.5  58.3  58.0  498.0 498.23  Y   Y   10.750 10.768  Y   Y
7/30   SpB      08:56 08:58  ok    ok      ok   ok    82.5  82.5  -10   -10  -20  -20  13.60 15.44  2.030 2.029   57.4  55.9  61.3  60.1  498.0 498.30  Y   Y   10.803 10.783  Y   Y
7/25   SpB      10:51 10:51  ok    ok      ok   ok    82.5  82.5  -10   -10  -20  -20  16.87 17.58  2.027 2.027   52.0  53.0  56.8  57.7  498.1 498.41  Y   Y   10.809 10.803  Y   Y
7/21   SpB      11:15 11:16  ok    ok      ok   ok    82.5  82.5  -10   -10  -20  -20  17.17 17.46  2.028 2.028   53.2  53.0  57.8  57.6  498.2 498.39  Y   Y   10.832 10.824  Y   Y
7/18   SpB      11:55 11:55  ok    ok      ok   ok    82.5  82.5  -10   -10  -20  -20  17.38 17.25  2.027 2.027   100.  53.2  100.  57.9    1.0 498.64  N   Y    1.000 10.827  N   Y
7/17   SpB   ----all was ok....didn't shutdown the system...see notes below----
7/16   SpB      10:29 10:29  ok    ok      ok   ok    82.5  82.5  -10   -10  -20  -20  17.3  17.6   2.026 2.040   100.  53.4  100.  57.1    1.0 498.73  Y   Y    1.000 10.827  Y   Y
7/14    BB      10:30 10:30  ok    ok      ok   ok    82.5  82.5  -10   -10  -20  -20  17.4  17.6   2.026 2.026   53.0  52.7  57.7  57.5  498.2 498.35  Y   Y   10.830 10.842  Y   Y
7/10   SpB       9:49  9:51  ok    ok      ok   ok    82.5  82.5  -10   -10  -20  -20  17.06 17.25  2.026 2.026   100.  51.4  100.  57.7    1.0 498.69  N   Y    1.000 10.862  N   Y
7/8    SpB       9:26  9:27  ok    ok      ok   ok    82.5  82.5  -10   -10  -20  -20  16.05 17.3   2.027 2.026   100.  51.4  100.  56.0    1.0 498.67  N   Y    1.000 10.862  N   Y
7/6    DB       10:40 10:40  ok    ok      ok   ok    82.5  82.5  -10   -10  -20  -20  16.5  16.8   2.026 2.026   53.9  53.8  58.5  58.2  498.3 498.5   Y   Y   10.862 10.865  Y   Y
7/5    SpB      14:08 14:08  ok    ok      ok   ok    82.5  82.5  -10   -10  -20  -20  18.19 17.4   2.025 2.025   51.9  52.1  56.9  56.9  498.4 498.5   Y   Y   10.861 10.856  Y   Y


                                      Tank Pressures (psi)
Date  JD    cal1(J4)  cal2(S10)  cal3(J1)  cal4(J3)   Reference       Purge         Nafion drier1   Nafion drier2
----  ---  ---------  ---------  --------  --------  ------------  -------------    -------------   -------------
9/30  273     1600      1950       1400      1300      650, 10       350, 10          1.2 -> 1.5     0.57 -> 0.7
9/26
9/23  266     1800      2050       1450      1400      800, 10       400, 10          1.5            0.65 -> 0.7
9/19  262     1800       270       1450      1400      800, 10       410, 13->10      1.3 -> 1.5      0.6 -> 0.7
9/15  258     1950       400       1500      1500      900, 8->10    480, 13->10      --              --
9/9   252      410       500       1510      1500     1000, 10       510, 10          1.1 -> 1.5     0.55 -> 0.7
9/2   245      620       700       1600      1520     1100, 10       700, 10          1.3 -> 1.5     0.65 -> 0.7
8/29  241      750,5psi  800,5psi  1700,1-2  1600,1-2 1200, 10       700, 0->10       1.4 -> 1.5      0.6 -> 0.7
8/25  237      900      1000       1700      1610     1200, 10       720, 10          1.3 -> 1.5**    0.5 -> 0.7**
8/20  232     1000      1100       1800      1710     1350, 10       700, 10          1.3 -> 1.5      0.6 -> 0.7
8/15  227     1100      1200       1800      1750     1400, 10       710, 10          1.1 -> 1.5      0.6 -> 0.7
8/13  225     1200      1300       1800      1800     1410, 10       720, 10          1.2             0.6
8/6   218     1400      1450       1850      1800     1500, 10       800, 10          1.4             0.7
7/30  211     1500      1550       1820      1800     1600, 10       800, 10          1.2 -> 1.5      0.5 -> 0.7
7/25  206     1780      1800       1990      1920     1750, 10       860, 10          1.4 -> 1.5      0.6 -> 0.7
7/21  202     1750      1820       2000      1990     1800, 8->10    900, 10          1.5             0.65-> 0.7
7/18  199     1800      1900       2000      2000     1800, 11->10   900, 11->10      1.4 -> 1.5      0.6 -> 0.7
7/17  198     xxxx
7/16  197     1900      2000       2000      2000     1900, 10       930, 10          1.5             0.7
7/14  195     1900      2000       2000      2000     1900, 10       930, 10          1.5             0.7
7/10  191     1900      2000       2000      2000     1900, 10       900, 10          1.5             0.7
7/8   189     1900      2050       2000      2000     1950, 7 ->10   980, 11 -> 10    1.4 -> 1.5      0.6 -> 0.7
7/6   187     1990      2100       2060      2000     2000, 10       990, 12 -> 10    1.5             0.6 -> 0.7
7/5   186     2100      2200       2180      2100     2100, 12->10  1030, 10          1.7 -> 1.5      0.8 -> 0.7



cal1= 349.4 (J4), or 349.6 (J8).
*cal2= 472.2 (S10, prior to 9/19), or 467.6 (S6).

                                                       Site Samples (ppm)
       1      2      3      4      5      6      7      8      9      10     11     12     13     14     15     16     17     18
Date  air    air    air    air    349.4  472.2  air    air    375.5  416.6  349.4  472.2  air    air    air    air    349.4  472.2
      21.5m  14m    11m    9m     cal1   cal2   7m     5m     cal3   cal4   cal1   cal2   2m     1m     0.5m   0.1m   cal1   cal2          
----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----
9/30  368.7  373.6  367.9  368.5  349.4  466.9  367.7  366.8  377.0  417.2  350.4  468.1  368.2  369.4  370.6  371.8  349.8  467.4
9/26                                               --- things looked ok ---
9/23  365.3  365.8  364.4  364.6  347.1  464.1  364.7  365.6  373.1  413.9  347.2  464.2  368.1  371.1  368.7  373.1  347.2  464.1
9/19  362.5  363.0  362.0  361.7   --     --    361.2  361.1  372.3  412.9  346.4  468.3  365.7  364.8  363.8  364.4  346.3  468.2
9/15  17.2   17.2   17.2   17.2   17.3   17.7   17.3   17.2   17.4   17.5   17.3   17.6   17.3   17.3   17.3   17.3    17.6
(approximate pressures)
9/15  371.7  384.7  370.6  370.8  356.2  474.1  370.3  370.1  379.3  420.2  355.3  474.3  393.0  371.1  373.3  377.5 353.7  473.5
9/9                               346.5  467.9
9/2                               346.2  467.3                371.7  412.3  346.2  468.0                              345.9  467.7
8/25                              345.9  467.6                371.8  412.2  346.0  467.5                              345.8  467.5
8/20                              345.7  467.3                371.6  412.3  345.7  467.3                              345.8  467.3
8/15                              350.5  470.6                375.6  416.7  349.8  471.3                              348.9  470.3
8/13                              346.8  467.3                371.9  412.8  346.4  468.2                              346.2  467.9
8/6                               346.1  466.8                371.7  412.2  346.1  467.7                              345.8  467.4
7/30  365.4  364.8  363.5  364.5  346.5  468.3  364.1  370.1  371.7  412.5  346.7  468.7                              346.6  468.6
7/25  367.9  367.2  365.8  366.2  346.7  467.7  366.6  366.6  372.2  413.0  346.8  468.7  368.5  369.1  371.1  370.1  346.6  468.5
7/21  367.8  367.6  368.9  367.5  346.7  466.6  366.3  366.9  372.3  413.3  346.9  468.6  374.0  379.7  384.6  389.1  346.2  467.8
7/19 (at 13:00)                                                             348.0  470.2                              348.0  470.2
7/18  374.5  372.7  372.3  370.5  351.4  470.0  369.7  371.4  374.1  414.0  349.7  471.2  375.1  372.4  375.4  374.3  348.7  471.2
7/17 (at 11:00)                   345.8  467.5                371.8  412.4  345.8  467.4                              345.7  467.3
7/16 (at 14:00, 3 hours later)    346.0  467.4                371.9  412.5  346.1  467.5                                     467.3
7/16  366.5  366.9  366.3  366.6  343.4  463.1  366.4  366.8  368.9  409.2  343.9  464.5  367.6  369.9  369.2  371.7  347.7  464.2
7/14  371.0  370.4  369.6  369.8  349.1  471.4  370.3  371.0  375.2  416.1  349.0  471.6  371.4  372.6  373.3  376.0  348.6  471.2
7/10  369.4  368.6  368.5  368.2  350.6  473.0  369.7  369.2  377.2  418.2  350.7  473.8  369.2  370.2  371.5  374.6  350.2  473.6
7/8   373.7  373.5  372.7  373.5  349.2  470.2  374.3  375.1  375.1  415.8  349.7  472.6  377.8  374.6  377.1  376.6  349.7  472.6
7/6   369.9  370.3  369.6  368.4  348.5  470.9  368.2  369.7  375.0  415.9  348.8  471.3  370.1  371.2  373.9  374.2  348.7  471.2
7/5   369.5  369.2  369.2  369.0  348.3  469.8  369.6  370.0  374.5  414.9  347.9  470.2  370.0  370.7  375.4  374.1  347.7  469.9


       Liquid N2 Level   
Date       (cm)           Topped Off?    Laser Heater   Data Start Time         
9/30        6                Y               3.45         11:29
9/26       11                Y (not quite topped off)
9/23        8.5              Y               
9/19       11.5              Y               3.48         13:31, 13:49
9/15       11.0              Y               3.48         15:31
9/9         8.0              Y               ----         10:55(1), 11:00(2)
9/2         8.0              Y               3.46         10:50(1), 10:53(2)
8/29       11.0              Y            
8/25       13.0              Y               3.45         11:40
8/20       14.0              Y               3.46         12:33(1), 12:36(2)
8/15       14.0              Y               3.45         12:31
8/13        ?                Y               3.46         11:29, crash, 11:32
8/6         ?                Y               3.46         10:07
7/30       12.0              Y               3.47         10:01, crash, crash, 10:23 
7/25       12.0              Y               3.47         11:17 
7/21        8.5              Y               3.48         12:04
7/18       14.0              Y               3.91         14:20
7/17       didn't fill laser dewar --- will do this tomorrow.
7/16       13.5              Y               3.9          11:29 
7/14       10                Y               3.5          11:12 
7/10       14                Y               3.93         10:15 
7/8        14.5              Y (full~20cm)   3.95         10:13 
7/6        15.5              Y               3.51         10:51 (and 11:01)
7/5        11                Y               3.53         14:52


Comments:
---------
9/30:  Turned off the pump and moved the 2nd 21.5m line back down to 14m (where it was originally).
       The data system shutdown shortly after we left the tent/tower.  Didn't finish filling out the
       form before leaving the tent.

9/26:  12:00 MST, filled LN2.  Note:  there is no more LN2 at MRS.  Need to bring up 10-l dewars
       from CU.

9/23:  No data download.  Only checked pressures and ppm values.  cal1 seemed to have a slightly
       higher pressure then the other lines, but didn't change anything (it was 17.4 (cal1) 
       vs 17.3 (others)).  At 9:28 MST filled LN2.

9/19:  Replaced cal tank2---Sirfer 10 with the backup, S6.  Adjusted tank pressures.  They seemed to not 
       need much adjustment.  The 1st time checked the values the valve for cal2 was not open.  Re-opened
       this valve and restarted the data at 13:49.

9/17:  9:39 MST--shutdown laser system.  Changed filters at all levels on the main tower (upper 6 levels).
       Changed inlet orifice at 2m (10:50 MST).  10:59 MST---restarted laser data collection.  Also topped
       off LN2 (not all the way since i'll be back up on Friday).  Didn't download any data, but did stop
       the data system and shutdown the pump.  Also, adjusted purge flow from 8->10 and Nafion Dryer2 from
       0.8-> 0.7.

9/15 : At 13:22 MST shutdown the pump to change the inlet filters.  Only changed the lowest 4 inlets
       (ie, the ones on the mini-tower).  Moved the 14m inlet up to be co-located with the 21.5m
       inlet (at about 14:00 MST).  (Note: forgot to check the nafion driers)

9/9 : When I arrived the PC was off---restarted the PC and recorded a short data file (~30 min) before
      shutting the system down and burning a CD.  There were power problems last night which was probably
      the reason the PC was off.  Note:  the fan did not sound very good when booting the PC. . .though
      it does seem to be blowing air ok.  Also note, the "OffsetGn" box was not activated---i had to
      manually start this.  The fan sounded better after running a little while, but still whines every
      now and then.

9/2 : Had to restart data system one time.  It looks to me like the gas out of cal1 and cal2 are being
      used faster than previously.

8/29: At about 13:00 MDT noticed that the flow of the UHP air was at zero cc/min.  Adjusted it back
      to 10 cc/min.  Also, adjusted the Nafion driers and checked the ref gas (it was ok at 10 cc/min).
      And topped off Liquid N2.  Readjusted the tarp over the cylinders.  Didn't download any data.

8/27: at around 1pm the tarp was wrapped around the cylinders.

8/25: Topped off Liquid N2 BEFORE filling in the data sheet.  It's raining.  Also, note:  Nafion dryer
      adjustment was not made until about 14:30 MDT (forgot to check it when filling out the form).

8/20: Reset the PC time to be near GPS time (the PC clock had drifted so it was off by about 7 minutes...see
      above table for exact time difference).  Crashed one time on rebooting.  Around 13:50 is when i actually 
      filled out the co2 concentrations since i went off and did the east robot right after re-starting the system).

8/15: Changed the pump oil.  Changed the inlet filters.  Note that the cal gases measurements are closer to
      the actual cal gas values (not sure why?). 

8/13: Last weeks CD was corrupted.  Made 2 CDs today.  (1) Data from Aug 6-13; (2) Data from July 31-Aug13 
      (some redundant files!).  Nafion flows are a bit low (not adjusted to normal level).  Crashed at
      beginning of restart -- had to restart.

 8/6: Laser had a good week.  No thunderstorms.

7/30: There was a crash right after starting (while recording values from site3).
      Went to the blue screen and had to restart tga.  After this the Tgaparam.tgs file
      was corrupted (there was no "Ramp B offset" in the parameter list) and had
      to be recopied from an old version of the file.  The tga then crashed again.
      The third time is ran ok.  After the 2nd crash the error message was:
                  Runtime error 205. at 0210:000C

      Also, the flow in the Nafian driers was lower than normal.

7/25: There was a crash right after starting (while recording values from site3).
      Went to the blue screen and had to restart tga.  happened at about 11:20.
      After that it started up ok.

7/21: No crash with the new software.  Shutdown the system to download data.  Also,
      installed the new UPS.  The cal gas values seem a bit low so I checked
      the alignment (see e-mail from Steve about how to do this---it's in the binder at
      the tent).  Here are the results:

                                DC Current
                optimal (498.17)           increased (499.17)
                ----------------           ------------------
  ref det sig.   2.4 (dropping)           6.16 (fairly steady)
  smp det sig.  27.6 (changing)          46.88 (fairly steady).

                 smp gain=0A (ok)     ref gain=0A (ok).



7/18: Laser crashed Thursday afternoon.  Installed new TGA software
      from Steve.  Had a few problems reading from the floppy drive.
      Needed to move the files to a different floppy disk with the gateway laptop
      and then it worked ok.  Everything else seemed to work fine.  The new
      software closes the valves when tga is moved into run mode.

7/17: laser was running fine so I just let it go.  I did record the cal gas numnbers to
      see if they were closer than what we saw yesterday.  It was almost exactly the same
      as yesterday (reading about 4ppm lower than the cylinder values).

7/16: Crashed sometime during the night.  Russ and I wrapped the sample cell with foam.  The
      cal values were quite a bit off when the system first came up (order of 6ppm).  This 
      difference had decreased to about 4 ppm 3 hrs later.  Also, I connected a wire from
      the grounding rod to the PC chassis...here are the voltages I measured:

                       1) DC Voltage:  0.3-0.4 mV
                       2) AC Voltage:  1.8 mV
                       3) Resistance:  2.1 ohms.

7/14: Brant (BB) stopped the data, burned the CD and filled out the sheet.  Was running fine
      when we arrived and was running fine when we left.  Replaced the 37-pin transputer cable
      which Steve FedEX'ed to me.

7/10: Sometime during the night the laser stopped working...this is the "lost linelock" error.
      Restarted fine.

7/8:  Yesterday (7/7) afternoon at about 16:39 MDT the data system lost linelock and output became zero mV.
      When arrived at the PC the message was, "lost linelock"; settings:  DC Current=1, RampB Offset=1.
      Appeared to restart ok.

7/6:  Error when restarting....Restarted at 10:56, restarted automatically, sampling level 8 at this time.  
      DC Current and "Ramp B" Offset equals 1, manually linelock and manually restared data collection.

7/5:  Sample Cell pressure slightly lower when restarted---probably due to change in the Nafion Drier flow rate.

                                                                                































70: bowling, Site none, Mon 07-Jul-2003 16:45:45 MDT, NOte: Laser Data giving ZERO.
July 7, 2003.

I was about to leave and was checking the laser data one last time. Both
signals are at zero.  This appeared to happen at about 22:39 UTC (16:39 MDT).

Will check these again tomorrow morning (might need to go up to the site
to figure out what happened).


69: bowling, Site none, Mon 07-Jul-2003 15:24:08 MDT, Note: Laser Data clipped
July 7th, 2003.

Started cockpit this morning and laser data appeared to
be working fine.  Since cockpit leaves a data trace as it
runs, I can see that, at some point during the day, the laser
data were clipping.  It's difficult to say how long this happened
for (it looks like a short time).  It was sometime between about
10am and 2pm MDT.  Everything looks fine now so there is nothing
to do about this.


					SpB.


68: bowling, Site laser, Mon 07-Jul-2003 15:20:01 MDT, Procedure for Downloading/Checking the Laser (TGA).
This is the ASCII version of a word file written by Dave Bowling.

For the original MS Word file go to:

      http://urquell.colorado.edu/bowling/docs/

The file is:

     41472 Jul  7 11:02 Tga_procedure_ver2.doc

In addition the spreadsheet for the data collection is
there...this file is:

    19456 Jul  7 11:02 niwot_field_form.xls


-------------------------------
Tga_procedure_ver2.doc
7/7/03

Niwot TDL Site Management and Data Collection

Be sure to go to the site with liquid nitrogen every time you visit.
Serious problems will result if the laser heats up.  (But wait until
the appropriate step below to refill the LN2 dewar.)

Items in bold should be recorded on a unique field form for each collection date.  

Record parameters upon arrival at the site:

1) If the keyboard lock is on ("Run" selected on Parameter menu), use
the down arrow key and select "Run/Edit" so you can use the keyboard.

2) Note the date, your name, time (your watch), and TGA time on the
field form.

3) Note if graph 1 is set to 12C (Y/N), and that the graph limits are
300 to 600 (Y/N).  Verify that graph 2 is set to 13C (Y/N), and that
the graph limits are 3 to 6 (Y/N).  These should always be true, if
not there is a problem in data collection and we need to know it.

4) Verify that Linelock, DataColl, Gradient, Laser on, SiteMean,
OffsetGn, and DualRamp are all correct (all should be on except
Gradient). Check the boxes on the field form (initial values column)
to indicate this.

5) Record the laser temperature, reference detector temperature, and
sample detector temperature.

6) Record the long cell pressure (use graph 3, set up the graph if
necessary - graph 3 does not alter data collection).

7) Change Graph 3 to TGA Ana Chan 1 and record the voltage to 3
decimal places (eg, 2.026; this is a measurement of long cell
temperature).  If the Ana Chan is not 1 (if it's 2 or 3) then you need
to select that channel using the Parameter menu.  The yellow nominal
"nom" selection under that menu should be 1.

8) Record the transmittance in the reference detector for ramps A and
B (Ref A % trans and Ref B % trans).  These should be visible in the
detector graph section, set up the graph if necessary.

9) Record the DC current, and note if there is an "A" following it
(Y/N) indicating that the automatic line lock is on for 12C.

10) Record the Ramp B Offset, and note if there is an "A" following it
(Y/N) indicating that the automatic line lock is on for 13C.

11) Type "S" to toggle site means mode (mean data collection ) off.

12) Type "D" to toggle 10 Hz data collection off.  You'll be asked to
hit a key to save data, or given an option to erase the data files and
you definitely don't want to do that.

13) Now that data collection has ceased, there is one more parameter
that needs to be recorded.  Change graph 1 to Laser heater and record
the voltage.

14) Hit Esc to return to blue menu.

15) Hit X to exit to DOS.

16) At the C:\tga> prompt type "exit" to return to Windows.

-------------------------------------
Burn data to a CD:

1) Open SimpliCDROM using icon.
2) Insert a blank CD.
3) Open Windows Explorer using icon.
4) Go to C:\tgadata.
5) Select all files and drag them to the CDROM window.
6) Go to C:\tgaparm.

7) Select all files except Tgaparm.tgs and drag them to the CDROM
window.

8) Go to CDROM window and click "Burn Disc" button.  No need to label
the volume.

9) Wait until CD is finished burning before proceeding to next step,
otherwise the CD won't burn properly.  While you're waiting, measure
the depth of the liquid nitrogen in the dewar and record the LN2 depth
on the field form.  Use a cable tie as a dipstick and blow on the cold
cable tie once you pull it out of the dewar (this makes it really
visible).  There is no box for this measurement on the original
printed field form (version 2 now has it), so just write the depth in
the comments section if you have the version 1 form (upper right
corner of the form indicates the version).  If you don't have a tape
measure, indicate the depth on the left side of the field form with a
line so it can be measured later.  After measuring, top off the LN2
and indicate that you did this by checking the LN2 filled? box on the
field form.

10) Using Explorer, move all files EXCEPT Tgaparm.tgs to the
subdirectory C:\tgaparm\oldparmdata.  This should leave only
Tgaparm.tgs and the oldparmdata folder in the directory.

11) Return to C:\tgadata and move all files to C:\tgadata\oldtgadata.
This should leave an empty directory with the exception of the
oldtgadata folder.

12) Check disk space at bottom of Explorer and consider deleting files
(oldest first) if it becomes necessary (unlikely).  It's best to keep
them on the hard disk as long as we can for an extra copy.

13) Close Windows Explorer window.

14) Close CDROM software, don't save the layout.

15) Label the CD with a Sharpie with "Niwot" and the date.  If this is
the second collection of the day, indicate so on both the CD and on
the field form so it's clear.

-------------------------------------
Start up the TGA run again:

1) Open MSDOS window using icon.
2) At C:\tga> prompt type "tga" to get the blue menu.
3) Select R for real time screen.  TGA parameters will change and adjust.

4) At this point, all the relays are on and cal gas is being wasted as
a result.  Press "S" twice to toggle site means mode on and off which
turns off the relays.

5) Watch laser, reference detector, and sample detector temperatures
for stability.

6) While you wait for stability, check tank pressures and flow rates
for relevant tanks and the Nafion driers and record them on the field
form.  Adjust if necessary and make a note on the field form if you
did this.

7) Once temperatures are stable (usually several minutes), make sure
Ref A and Ref B are displayed in detector graph window.  Set up the
graph if necessary

8) Verify absorption lines are in the detector graph window, then
press "I" to line lock for 12C.  If you can't find the absorption
lines, then you need to look for them.  Check the manual.  Note that
to search for the lines you need to manually turn on one of the inlet
lines using the switches on the relay board to provide some gas to the
long absorption cell.

9) Press "Alt-I" to line lock for 13C.

10) Verify that all relay switches are in the "auto" position.

11) Set graph 1 to 10 Hz Conc A.

12) Set graph 2 to 10 Hz Conc B.  These steps are critical as the data
that is plotted in graphs 1 and 2 is the data that is saved.  If you
select some other parameter to be graphed here you will ruin data
collection so make sure!  Note that graph 3 does not affect data
collection and can be adjusted and modified as necessary while
running.

13) Set graph limits on graph 1 to 300 and 600.

14) Set graph limits on graph 2 to 3 and 6.  These steps set the D/A
output ranges that are read by the 21X datalogger and saved to the CU
data system.

15) Press "D" to start 10 Hz data collection.
16) Press "S" to start site means mode.

17) Immediately check the time and record it on the field form as the
data start time (TGA time, not your watch, hh:mm).  This is used to
name data files.

18) On a 6-minute interval boundary (top of the hour, 6 mins after the
hour, etc) the profiler will begin cycling through the 18 sites.  You
may need to wait up to 6 minutes before the data in the next step
appears on the screen.

19) As the TGA cycles through the 18 sites, write down the [12CO2]
concentration that appears on the screen for each site (labeled
MeanConc in the 3-row table near upper left).  Only 3 sites are
visible at a time and if you miss one then you have to wait until it
comes around again (a cycle takes 6 minutes).  Check to make sure the
air values are reasonable and that the cals are within 5 (10?) ppm of
the correct value (at right of the cells on the field form).  If the
cals are farther off than 5-10 ppm from correct there may be no flow
from the tanks and this needs to be fixed by adjusting delivery
pressure on the tanks.  This is not as easy as it sounds - call Dave
or Steve.

20) Record these things again and verify that they are similar to the
values that you saw earlier: laser temperature, reference detector
temperature, sample detector temperature, pressure, TGA Ana Chan1, Ref
A % trans, Ref B % trans, DC Current, DC Current "A", Ramp B Offset,
Ramp B Offset "A".  Don't check the laser heater again as this will
cause data collection problems.  This step can be combined with the
above step if you're paying attention since the above step involves
some waiting.

21) Verify that Linelock, DataColl, Gradient, Laser on, SiteMean,
OffsetGn, and DualRamp are all correct (all should be on except
Gradient). Check the boxes on the field form (after restart column) to
indicate this.

22) Put in "Run" mode instead of "Run/Edit" mode to lock the keyboard
(left end of menu).

23) Shut the tent window in case it rains.

If the system crashes after you restart: It will try to restart
everything automatically, and if you had data collection on ("S" and
"D") it will turn them back on.  HOWEVER - sometimes when there is a
crash, the software sets DC current and Ramp B Offset to 1 mA, in
which case the software will never be able to find the absorption
lines.  If you see a crash, immediately check these parameters and set
them to the appropriate values if they are set to 1 (use the latest
values on the field form if you have them, otherwise try DC Current =
498.5, Ramp B Offset = 10.865).  You will usually need to manually
LineLock ("I" and "Alt-I") after things stabilize, or in some
instances you may need to search for the lines manually by adjusting
DC current (see the manual).  You may also have to restart data
collection ("S" and "D", record the time again).  This seems to occur
within 4-6 minutes of restarting, but does not repeat.  Keep an eye
out for this problem before leaving the site.  

The values that are written down in the "after restart" columns and
for [12CO2] at the 18 sites should reflect the system condition when
you leave the site, once things are working properly.  Please watch a
while longer and either write down the second round new values or at
least verify that they did not change as the system runs a complete
6-minute cycle.  Please take detailed notes on any crash that you see
(in comments section on the field form), and let us know as soon as
possible so we can diagnose the problem.

Contact info - call anytime

Dave Bowling, Dept of Biology, Univ. of Utah
801-581-2130 work
801-832-9765 home

Steve Sargent, Campbell Scientific
435-750-1705



37: bowling, Site none, Wed 21-May-2003 12:35:28 MDT, Talk with Dave Bowling (May 21, 2003)
Date:    Wed, 21 May 2003 10:50:27 MDT
To:      aturnip@stripe.colorado.edu
cc:      sean.burns@Colorado.EDU
From:    "Sean Burns" 
Subject: Bowling Phone Call...

Hi Andrew,

Dave Bowling called and I talked to him for about 1/2 hour....here our
my notes from our talk (i'll put these in the logbook)...i think you
already know about most all of these:

General:
--------

1. On June 30th we will need extra people to haul Laser and Robot
system out to the field.  

2. He wanted to have everything setup and ready for installation prior
to them arriving on the 30th.

3. He is going to mail us a csat sonic this week.

Laser System:
-------------

1. Order a cylinder of 5% Ultra-pure Air + a regulator for this tank
that will allow for low-delivery flow rates (for laser system).  In
addition we should have a tank of CO2-free air (not N2!) which they
can use to dilute the Ultra-pure tank.  Dave is bringing along 8 cal
cylinders for the system....at any given time 5 cylinders will be
attached to the laser system.

2. Tent---should be near the main tower...best not to have a floor so
they can put supports into the ground.  Within the tent will be a PC
to run the laser system...he asked if we can find a table for the PC
and chairs to sit on.  Also, since they plan on working at night, a
light for the tent.

3. Big pump for laser (should be about 100' away from the tent since
it is noisy).  Need to have a pallate for the pump (for leveling) and
a tarp to keep the rain off of it (need to keep open for cooling).
Probably best to have the exhaust from the pump downhill of the tower.
(note: can't scrub the exahuast since the laser is sensitive to
pressure constrictions at outlet).

4. Liquid Nitrogen.  Need about 10L 2 times per week.  (might be less
than this).  I recall you talked to steve at MRS about the deliveries
going to MRS...was that the plan?

5. Need 2 differential analog inputs on a datalogger for laser
diagnostic signals.  The signal is +/- 10V but should be able to work
with a CR-23X (since laser is a campbell instrument).



Robot System:
-------------
1. Robots will be DC powered.

2. Need to select robot sites (E and W of main tower).  I think Russ
wants to be in on this, right?

3. Need to get power out to the tower sites.

4. Two Sections of scaffolding tower to mount the robots and keep them
off the ground.  A way to get the inlets to treetops (pvc tubing?).

5. We supply 2 tanks of CO2 to go with the robots.





36: bowling, Site none, Wed 21-May-2003 12:31:04 MDT, Plan from Dave Bowling (email from April)
Date: Mon, 21 Apr 2003 13:37:32 -0600 (MDT)
From: turnipseed andrew a 
To: Sean Burns 
Subject: summer plans (fwd)



Sean - just forwarding you some stuff I got today for Bowling et
al. at Utah.  Also - talked to Kurt at ATD - he says go for it with
extension cords and battery charger/battery system.  He may even have
some long extension cords he could loan us for the summer.

andrew

Andrew A. Turnipseed
EPO Biology
Campus Box 334
Univ. of Colorado, Boulder
303-492-5796
aturnip@colorado.edu



---------- Forwarded message ----------
Date: 21 Apr 2003 12:00:52 -0600
From: Dave Bowling 
To: "Monson, Russ" ,
     "Schauer, Andy" ,
     Dean Andersen ,
     "Sargent, Steve" ,
     "Turnipseed, Andy" ,
     "Bowling, D" 
Subject: summer plans

Hi everyone,

We're coming to Colorado in 5 weeks, so we need to get moving.  Last
time I posed several questions, and got answers to most things.  The
latest version of the summer plans thing is attached.  We no longer
plan to interface with the existing profiler system.

There is a proposed deliniation of responsibilities for some tasks
like solar power and structures to mount things on.  Andy T and Russ,
please take a look and make sure you can provide everything on the
list under your name (or tell me now if you can't and we'll figure
something else out).

Andy T and Andy S, please coordinate as necessary to make things work
- you'll each need details from the other I'm sure.

Please let me know if you have any questions.

DB


-----------------------------------------------------------------------

(Message inbox:401)

Date:    Mon, 21 Apr 2003 13:36:22 MDT
To:      Sean Burns 
From:    turnipseed andrew a 
Subject: Re: niwot ridge plan attached (fwd)



---------- Forwarded message ----------
Date: 21 Apr 2003 11:01:12 -0600
From: Andy Schauer 
To: turnipseed andrew a 
Subject: Re: niwot ridge plan attached

hi andy,

gearing up for the trip here. i have a few uncertainties.

1) you were checking on some sections of tower...do you have a
structure that we can mount these autosamplers to? they are 1 50 lbs
and need to be upright (i have attached photos). whomever will be
servicing them (swapping flasks, changing reagents, etc) will be most
appreciative if they are mounted at lab bench height. in the past we
have used scaffolding tower material , our own frame built out of
unistrut, and sheds. if you do not have anything for mounting, please
let me know so i can plan accordingly.

2) we will need one cylinder for each autosampler of ~400ppm. can you
provide this or give me contact information to a sugge sted source so
i can get the ordering going?

thanks, andy, looking forward to meeting you!

andy



On 1/31/2003 12:07 PM, turnipseed andrew a  wrote:
 Dave and all

 A few comments - also include some comments on Deans reply.

 Starting Date ; no problems on end of May - you just may realize you
 could be setting up in the snow.  Last few years have been dry and
 meltoff occurred early.  Snow was gone by last days of May.  However,
 the year we approached average snowpack (1999) - snow lasted into
 mid-June.

 So far we're at ~70% of average - another dry year, but as Russ keeps
 telling me - El Nino is supposed to give us a dry mid-winter and a
 wet spring - so its too early to speculate.  One other note - I may
 be out of town for a long (3-4) day weekend after May 27.  But should
 be around when everyone first gets here.
 
 On Dean's comment about NCAR coming.  No concerns here.  Meeting
 yesterday concerning the inititiative that funded last fall's
 study. No plans to come back this summer as far as I can tell.
 Jeilun Sun (who headed the study) just wants to work on data
 analysis.
 
 Dave's questions :

 (1) Logger program - I'll send that shortly - having 2 offices I
 always find that what I need is at the other office.

 (2)(3) I have to refresh myself on how many control ports are on a
 CR10x (which runs the profiler).  We are using 4 to control the
 valves.  At the very least, you could connect to the 4 control ports
 and then use their values (0 or 5V) to deduce the level.  Have to
 think a bit more about how to synchronize - but can't believe its too
 difficult.  I'll have to look for the electronics drawings - they
 were made by an undergrad who's long gone, but I think we still have
 copies of these.
 
 Pressure transients and flow rates. This will be much easier to see
 once I find a picture of the flow system - but will try to describe
 it anyway.  I think Dean is right in that the flow through the main
 lines should be kept pretty high so that you don't condense water in
 them (especially on high inlets that then lay on the ground going
 back to the IRGA).  However, the sampling flow rate through the IRGA
 could (and probably should) be reduced.  It is not a 3-way valve -
 the main lines are being continously pumped by a main pump.  There
 are tees on the main lines that lead to a solenoid mainfold (2-way
 valves) which select which level gets sampled to the irga.  the main
 flows are controlled by rotameters (simply a needle valve) and you
 can see the flow drop about 30% when a level is sampled (because now
 a second pump is pulling that line as well).  Dean said that the
 sampling flow rate through the irga was about 1 Lpm - seems awfully
 high to me.  Seems like we need less of pump on this end and should
 flow this around 200-400 sccm - maybe be using the TDL pump. the
 downside to slower flow is slower flushing time, but most of the
 tubing is (or could be) 1/8" and should flush in just a few seconds
 (< 5) even with a much slower sampling flow rate.  I would think that
 lowering the sampling flow rate should greatly reduce the pressure
 transient, because the Irga pressure (~ 580 mbar, from Dean) seems
 awfully low relative to what is probably in the main lines/glass
 reservoirs (probably closer to ambient - 700 mbar).  The profiler on
 the CU tower (another independent profiling system - the one you used
 Dave) works more like this - it has a sampling flow of ~ 350 sccm and
 you don't see really bad pressure transients - its also easier to
 match the pressure during zero's and span's as well - you don't have
 to pull a high flow rate off of the cylinders.
 
 Sample heights - My profile system on the CU tower has an inlet a 0.5
 m and at 1 m.  Can send you some of the data from those 2 levels
 (plus others) if you wish.  But I agree with Dean - the difference
 between 1 and 0.5 m is not as high as I would have expected.  It sort
 of looks like the lowest 5-6 m actually get reasonable well-mixed at
 night - probably due to a relatively strong drainage flow along the
 ground.  There's a sharp drop above 6 m accompanied by a minimum in
 wind speed and temperature at that height.
 
 So - I'll try to gather some drawings and logger code and send them
 along shortly.
 
 cheers
 
 andrew
 
 
 On 30 Jan 2003, Dave Bowling wrote:
 
   Hi all,
  
   Here's an updated version of the sampling plan.  There is a list
  of questions at the end that need to be addressed by you Colorado
  people.  Please take a look and respond to those questions which
  you think you can answer.
  
   There is also a description of details of the profile system that
  I got from a few phone calls.  Dean and Andy T, please look that
  stuff over and correct as necessary.
  
   Russ, let's talk on the phone once you have a chance to look this
  over.
  
   Thanks,
   Dave
   --
   Dave Bowling
   Dept. of Biology
   257 S. 1400 E.
   Salt Lake City, UT 84112
   (801)-581-2130
   bowling@biology.utah.edu