Xylem GL500 MULTICHANNEL DATA LOGGER - Manual (Page 25)

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Click on the Low EU field and enter the
low engineering unit that will be used
to calibrate the sensor, not the lowest
reading the sensor can output. In the
example of pH, enter 4 which is the
lowest calibration solution to be used.
Click Next.
Place the sensor in the condition that will
cause it to output the level corresponding
to the low EU entered in the previous menu.
Wait for the data reading to stabilize.
Click Next to complete the calibration.
XV. Digital Setup:
The Digital Setup screen is used for setting up the two digital pulse channels.