Evoqua WALLACE & TIERNAN GMS PLUS, Original Instruction Manual, Page: 55 / 116

GMS
plus
Installation
5.
55
5.4.3 Ozone sensor
Adjusting the zero point
Please note
During the zero point adjustment there should be no chlorine,
chlorine dioxide or ozone gas in the room air!
Proceed as follows:
1 Press the F key in the basic display.
The menu "DIAGNOSIS" is displayed.
2 Press the key until the menu "Input I" or "Input II" appears.
The current sensor current is displayed.
3 Slowly adjust the zero point potentiometer 1 (for input I) or
zero point potentiometer 2 (for input II) until "0.4 µA" is
displayed.
Please note
The potentiometers are located on the upper left part of the
GMS
plus PCB.
Setting the span Proceed as follows:
1 Press the F key in the basic display until the menu
"CALIBRATION" is shown.
Setting the span to factory
setting
2 Press the key until the menu "Test Sensor I" or
"Test Sensor II" appears.
3 Use the key to switch to edit mode.
4 Use the key to select menu "Test" and press the key to
save.
Please note
The GMS plus simulates a cell current for 5 minutes according to
the measuring range-end value.
5 In the menu " Span Sensor I" or "Span Sensor II", set the
measuring range-end value to 1.0 ppm and press the key to
save.
To end the simulation, go to "Test Sensor" and select "Off".
A Zero point potentiometer sensor I
B Zero point potentiometer sensor II
A B