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Figure 3. Battery
Location
5. Allow span gas to flow until the displayed reading
stabilizes – approx. 3 minutes. Then, using Calibra-
tion Tool 06-9453 (supplied in Calibration Tool /
Cup Kit 19-3242), turn the Span Adjust potentiom-
eter until the displayed reading matches the
concentration stamped on the Span Gas Cylinder.
6. Calibration is now complete. Turn off the Regulator
and remove the calibration equipment.
Maintenance
Battery Installation
Remove the slotted screw from
the rear of instrument; then
lift off the front case.
Install a 9V Alkaline battery
(Duracell MN1604 or equiv.) in
the location shown in Figure 3;
then reinstall the front case.
Sensor Replacement
The sensor needs replaced when it can no longer be
calibrated to the Span Gas Cylinder value using the
Span Adjust potentiometer.
1. See Figure 4. Remove the screw from the rear of the
instrument; then lift off the front case and remove
the printed circuit board assembly.
2. Unplug the old sensor and dispose of it properly.
3. Inspect the sensor gasket and filter. Replace an
item if is torn, deformed, or contaminated with dirt.
4. Remove the wire-jumper from the pins of the new sensor;
plug in the sensor; then reassemble the instrument.
5. Calibrate the new sensor.