METCRAX: TRH Messages: 21 Entries..

TRH has been quality controlled
Summary:

1. T.flr and T.sht: ok
2. RH.flr and RH.sht, RH.sht shoots up to ~150-200% when temp. gets too cold.
3. RH.eu, note: had to remove a lot of data on 1.5m, 3m, and 5m, the 3m required most removal of data. Sensors were "ratty".
4. T.eu: ok
5. T.el: note: had to remove some data from T.5m, T.8.5m, T.1.5m, and the most from T.3m
6. RH.el: note: RH.5m was bad after Oct.6, had to remove some data from RH.3m 
and 8.5m.
7. T.sw, ok
8. RH.sw, ok, was consistantly higher than rim, not sure if ok, but probably is
9. T.rim, ok
10. RH.rim, ok
11. T.wu, note: everything ok except T.1.5m was bad and was replaced OCt.10
12. RH.wu, note: everyting ok except some bad data at RH.1.5m from sep. 23 -
sept. 27, also removed a little data for RH.1.5m.
13. T.wl, everything ok except removal of a little data when replaced T.0.5m with T.1.5m on oct. 4.
14. RH.wl everything ok except removal of a little data when replaced T.0.5m with T.1.5m on oct.4.

TRH serial numbers determined from data files sfx_20061015120000.dat,
where sfx = flr, el, wu, etc.

dsm=1, flr:
s=1004: TRH701
s=1014: TRH702
s=1024: TRH005
s=1034: TRH006

dsm=2, el:
s=1004: TRH204

dsm=3, wl:
s=1004: TRH704 (after 18:24 UTC 10/4/06
s=1014: TRH004 (after 20:06 UTC 10/6/06; TRH704 until 18:00 UTC 10/4/06)
s=1024: TRH104
s=1034: TRH502
s=1044: TRH101

dsm=4, eu:
no TRH at this site

dsm=5, wu:
s=1004: TRH703
s=1014: TRH007
s=1024: TRH008
s=1034: TRH001

dsm=6, rim:
s=1004: TRH206

dsm=7, sw:
s=1004: TRH003

The solar panel units on the SHT sensors have shutdown. The .5m and 2m
shutdown on the night of 10/23 while the new unit at 5m shutdown last night.
These units were not designed for extensive outdoor use.

I tried to align the SHT probe such that the sensor was perpendictular to the
air flow to see if that would improve the performance compared to the 50Y.
This took place during our routine visit to the floor (~11:30 to 13:00).

A new solar panel/battery system was attached to SHT.5m. The sensor
is woking again.

The TRH booms apparently were installed in the wrong order (despite being
clearly labeled).  We now know that the order of the sensors in the data
is: 1.5m, 5m, 8m, and 3m.  I will change the config now to reflect this
change.

Steve played around with TRH.5m probe, but this did not recover the humidity 
values.

The 5m SHT sensor died last night. This the unit that does not have the solar
panel. So a full set of 3 AA batteries lastest about 1 week. A new solar
panel unit will be installed hopefully today.

I changed the output message of the SHt probes so that we are collecting the
raw data for temperature and RH. This took place during our visit today, around
1:30pm.

The 5 minute averages compared to the TRH sensors are not as good as expected.
I believe this may be due to the wireless link. Each unit uses a radio talking
to a common master tied to the ADAM. The radios due not have a high level of
collision protection so some data messages may be bad. I saw this event during
lab tests. Therefore the 5 minute data may have bad data averaged in. I'll
need to look at the raw data.

On Wednesday, 18th, we installed 3 prototype Sensirion SHT75 temperature/
humidity probes. They are collocated with TRH sensors at .5m, 2m, and 5m
heights. The probes were mounted instide the TRH shield.

We've seen that T.2m.flr is always higher than T.0.5m.flr, even in the day.
This usually is a symptom of a bad fan at 2m, that would cause it to read
high.  We inspected these fans today, but all were working (though 2m was
quieter and seemed to have slightly less flow).  Nevertheless, we decided
to swap the fans between these two sensors.  This was done by Steve S. between
1200-1300.  Now the profile changes as expected.  (Though is 0.5m could now bee
too high/low??)

He also took advantage of the opened-up sensors to check and possibly adjust
the SHT75 sensors he installed yesterday (or was it the other way around?)

The SHTs give bad (high) RH values when the temperature is below zero.  Steve
Semmer thinks this is an error in the unsigned math used by the PIC.  We'll
see if it is correctable, but in any case won't worry about it.

Tried to fix the problem with the RH at 3m at east upper, but it appeared to be behaving itself while we were there...

Swapped the wires for the 1.5m and 3m RH within the Campbell data logger and 
the bad data followed the 50Y.
Swapped the RH transducers between 1.5m and 3m and the problem stayed at 3m.
The conclusion is that the problem is in the wiring between the 50Y transducer 
and the Campbell data logger.

Replaced TRH007 at 1.5m on wu on the afternoon of 10/10/06.

Would not go back into the boom so used a file,
WD-40, and a small sledge to get it in... Might be 
still a little tight coming out.

Because 1.5 m RH is ratty at east upper, Charlie tightened the terminals in the 
50Y data logger.

Because 3 m RH is ratty at east lower, Charlie tightened the terminals in the 
50Y data logger.

Removed 1.5m TRH at west upper this afternoon, 10/7/06
kh20 s/n = 1395

The 1.5m TRH sensor was reinstalled at wl.

7/9/07:

Reinstalled at 13:06 (Arizona) 10/6/06

10/4/06, morning

Charlie and I tried to install the TRH that had been sent to Boulder at 0.5 m 
on the west lower slope station, but it did not work.  
The T and RH data were not correct and the fan did not work.

Moved the 1.5 m TRH down to 0.5 m and took the bad TRH back to the base.


7/9/07:

TRH 004 at 1.5 m was replaced by TRH 704 at 18:23 (UTC?)

10/4/06, morning

Charlie and I fixed 1.5 m TRH, which was reporting a temperature of -40 C, 
by unplugging and plugging back in the 50 Y at the end of the circuit board.
Simply recycling power did not work.