Field Notes

Mayberry: 2015-04-23 09:30:00 (DOY 113)
Author: Joe Verfaillie
Others: Patty

Summary: Swapped 7500, service miniDOTs adjusting depths, mux box door may not have been latched.

Mayberry
2015-04-23

I arrived about 9:30 with Patty. It was a mild, sunny day with a cool breeze from the west. The site still looks mostly brown but green (especially tules) is beginning to poke through.

The 7700 read: 2.01ppm CH4, 30.9RSSI â€“ 71 after cleaning, wash reservoir was full

We swapped the 7500 head
Removed sn 75H-2514: 399ppm CO2, 572.5mmol/m3 H2O, 101.6SS, 16.62C, 101.0kPa
Installed sn 75H-2180: 403ppm CO2, 555.1mmol/m3 H2O, 95.9SS, 17.56C, 101.3kPa

We serviced the miniDot/Forerunner profile. The bottom level was probably in the mud. The water depth at the post was 97cm and the bottom level was at 107cm. We moved the bottom level (miniDOT sn 1221) up 15cm to 92cm and moved the middle level (miniDOT sn 1219) up 10cm to 50cm below the water level. The top level (miniDOT sn 1220) is at 25cm below water level. New desiccant packs went into the miniDots. SOMEONE screwed the miniDots together so tight again that I could barely get them apart. There is an o-ring that keeps them water tight. They only need to be snug.
[Edit 2020-04-15 by Daphne: I'm assuming Joe also adjusted the Forerunner/Eosense GP profile and moved the sensors to the same heights as the miniDOT sensors.]

We investigated strange thermocouple readings. The door to the mux box might not have been latched last time. I put desiccant packs in both boxes. I checked terminal screws and found some of the power and control screws on the AM25T turned almost a full turn.

I forgot to bring the atmospheric pressure sensor for reinstall.

0 photos found

11 sets found

7 MB_flux graphs found