Field Notes

West Pond: 2014-09-08 16:20:00 (DOY 251)
Author: Cove Sturtevant
Others: Patty

Summary: Installed 7500 & 7550. Needs u-bolt and temp sensor. Verified Forerunner CO2 probe roll-over above 5V. Corrected clock settings on 7700.

West Pond
2014-09-08

Patty and I arrived about 16:20 PDT. It was warm, sunny, and windy. We installed a 7500 (sn 2180) and 7550 (sn WP-0666). We didnâ€™t have a U-bolt to attach it to the rail so we zip-tied it. Also didnâ€™t have the temperature sensor. Will install next time.

After install all readings looked good. The 7700 clock was reading 1 hour ahead and was in US/Pacific time. I bumped the clock back 1 hour and changed the time to Etc/GMT +8.

The Forerunner CO2 probe was reading 474 mV, which was much lower than the ~5000 mV we have been seeing. I pulled it from the water and watched the mV decline to 0 then jump to 5000 mV and continue declining. Now we know for sure that the jumps in the readings are the measurement rolling over in excess of 5000 mV. I replaced the sensor.

7500 readings:
CO2 = 16.0 mmol m-3
H2O = 610 mmol m-3
signal strength = 95.04%
p = 100.6 kPa
t = N/A
sos = 347.8 m s-1

7700 readings:
CH4 = 1.95 ppm
RSSI = 69%
Reservoir full.

Met looked good.

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