Global Water WL16S Instruction Manual page 31

Assume that you wish to set the zero reference point to the lowest water level
in the data record. This will show this low level as zero and all others as a positive
level above it.
• Download the historical data and find the lowest water level in the record.
• Enter the setup menu and note the difference between the Low and High EU
numbers; this is always the depth at which, the sensor was calibrated.
• Type the lowest water level from the data record into the Low EU field.
• Add this number to the calibration depth and enter it into the High EU field.
• Re-program the data logger according to the programming procedure.
Suppose you want to set the zero reference level to that of a specific event
(date/time or a specific event such as a significant rainfall or a well pump turning on).
Note that this will set a zero reference. Other levels are relative to this and can
include negative numbers.
• Download the historical data and find the water level in the record for the
reference date/time (or special event) you are interested in.
• Enter the setup menu and note the difference between the Low and High EU
numbers; this is always the depth at which, the sensor was calibrated.
• Type the water level from the data record which corresponds to the specific
date/time or event into the Low EU field.
• Add this number to the calibration depth and enter it into the High EU field.
• Re-program the data logger according to the programming procedure.
Suppose you want to set the current water level as the zero reference.
If you want the current level to read zero you must only take a single reading and
offset the Low and High EU numbers by that amount. Note that this will set a zero
reference and that other levels are relative to this and can include negative numbers.
• Install the WL16 and take a reading.
• Enter this reading into the Low EU field as a negative number. If you
measure 8.35 feet, enter –8.35 as the new Low EU.
• Add the calibration depth to this number and enter it in the High EU field.
• Re-program the data logger according to the programming procedure.
Global Water
800-876-1172 • globalw.com
- 31 -