Calibrating Level Sensors For Depth To Water Readings - Global Water GL400 User Manual

Calibrating Level Sensors for Depth to Water Readings

Note, that to take depth to water readings, the bar graph must be
calibrated to the full scale of the sensor. Follow the worksheet
Calibrating Bar Graph to Higher or Lower Ranges*.
The first step is to find the Total Depth of the sensor. This is the
distance from the end of your sensor to your datum. (Cable lengths
from the factory are not exact. You may need to measure for precise
distances.)
Total Depth = _____________
Next, find the maximum Sensor Depth (range of the sensor). In the
Calibration** section of the software, you can find this value by
using the following equation:
Sensor Depth = | High EU______ - Low EU______ |
Sensor Depth = ___________
Now you can find your new Engineering Units using these steps:
New Low EU = Total Depth
New Low EU = ___________
New High EU = Total Depth – Sensor Depth
New High EU = __________
Finally, enter these New EU values into your datalogger and verify
the readings are correct**.
* See Appendix B: Worksheets, page 36
**See Analog Channel Calibration, pages 25 – 27
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Worksheets
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