See Figure 12-14. The conical end of the check valve points in the direction of the air
flow.
13. Replace the air pump access panel.
14. Connect the sample pump tubing to the pump. Connect the reagent and air
injection tubing. Connect the air inlet tubing to the barbed fitting at the bottom of
the enclosure.
12.3.6 Replacing the air pump diaphragm and check valves
Complete the following steps to replace the air pump diaphragm and check valves on your
total chlorine system.
WARNING!
HAZARDOUS VOLTAGE
Can cause severe injury or death. Disconnect power before servicing.
Procedure
1. Disconnect power to the transmitter.
2. Refer to Figure 12-12. Disconnect the reagent and air injection tubes. Disconnect the
suction and discharge fitting by turning the Luer fitting in the direction shown in the
figure. Disconnect the air pump inlet tubing from the barbed fitting at the bottom of
the enclosure.
3. Remove the four screws (circled in Figure 12-13) holding the air pump access panel.
Pull out the pump and panel.
4. Disconnect the air inlet and outlet tubing from the air pump.
See Figure 12-14.
5. Remove the five screws (surrounded by squares in Figure 12-13) holding the air
pump to the access panel.
6. Pull the rubber base off the pump.
7. Using needle nose pliers, remove the air inlet fitting from the side of the air pump.
See Figure 12-16.
Inlet FittingFigure 12-16:
Maintenance
Manual 65
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