In-Situ Level TROLL 400/500/700/700H Operators Manual - Manual (Page 15)

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back of the sensor. The unit of measure is PSIG (pounds per square inch gauge),
measured with respect to atmospheric pressure.
Gauged Pressure Sensor
1 Sensor back
2 Sensor front
3 Water pressure, P
W
(e.g., 20 PSI)
4 Atmospheric pressure P
ATM
(e.g., 14.5 PSI)
5 Atmospheric pressure P
ATM
(e.g., 14.5 PSI)
BaroTROLL Atmospheric Pressure Sensor
Barometric pressure applies a direct stress upon open wells and surface water. Locally,
barometric effects can change significantly from location to location as a result of
topographical and micro-meteorological changes. Therefore, it is important to
compensate for the barometric pressure changes when monitoring water elevation.
BaroTROLL Sensor
1 Sensor back
2 Sensor front
3 Atmospheric pressure P
ATM
(e.g., 14.5 PSI)
4 Vacuum