Field Notes

Bouldin Corn: 2017-10-26 09:15:00 (DOY 299)
Author: Daphne Szutu
Others: Joe, Sam

Summary: Regular data collection/cleaning, added 24V/10A power supply, LI-7550 temperature broken, CO2 very high

2017-10-26
Bouldin Corn

We arrived at 9:15. The overpass gate was open again, maybe now that it is duck hunting season.

Joe installed a new power supply, 24V/10A. Power going into the datalogger enclosure is now 24V, and there is a DC-DC converter inside to step it down to 12V. The first screw terminal with 24V is connected to: incoming power, 7550, 7700, sonic, and DC-DC converter. The second screw terminal with 12V is connected to: DC-DC converter, green pluggable power strip, HMP fan, and camera.

Sam cleaned the EC and radiation sensors and refilled the wash box (it was mostly full). I downloaded the met, camera, and USB GHG data.

The CO2 and 7550 temperature reading were too high. We removed, inspected, and reattached the 7550 temperature sensor, but the numbers were the same. Next time we can bring a replacement temperature sensor. We'll have to look at the CO2 data closely.

I had to update the 7550 pressure coefficients again, although last time I thought we had updated them.

LI-7500 readings:
CO2 661.6 ppm (24 mmol/m3) (too high)
H2O 557
T 72.6 (too high)
P 101.4
SS 96.6 --> 102.5 after cleaning

LI7700 readings:
CH4 3.5
RSSI ?? --> 67.0 after cleaning

We left at 9:50.

0 photos found

6 sets found

17 BC_met graphs found