Campbell Scientific CRS451/CRS456 Submersible Water-Level Recording Sensor - Manual (Page 16)

CRS451/CRS456 Submersible Water-Level Recording Sensor
4. Add offset to relate water level measurements to a known datum or
reference point. (Aquifer test start at level 0.)
a) This step is optional and not required.
b) This offset takes effect at the Start Time—which is set in a subsequent
screen—so it is necessary that this sensor be in its permanent
measurement position before the Start Time, otherwise the offset
correction will not be correct.
5. Select a Start and Stop Time.
a) Select a time in the future when measurements should begin.
Selecting a time in the past will force the sensor to begin making
measurements immediately at the indicated frequency. If an offset
calculation was selected in the previous screen, the sensor will not
make correct measurements. If an offset calculation is needed, a Start
Time must be selected far enough in the future that the sensor can be
properly placed in its measurement position before measurements
begin.
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