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MODEL FCL-1056 SECTION 8.0
MAINTENANCE
55
33523-00 Electrolyte Fill Plug
9550094 O-Ring, Viton 2-014
33521-00 Membrane Retainer
23501-08 Free Chlorine Membrane Assembly: includes one membrane assembly and one O-ring
23502-08 Free Chlorine Membrane Kit: includes 3 membrane assemblies and 3 O-rings
9210356 #4 Free Chlorine Sensor Fill Solution, 4 oz (120 mL)
TABLE 8-1. Spare Parts
FIGURE 8-1. Chlorine Sensor Parts
8.3 pH SENSOR
8.3.1 General.
When used in clean water, the pH sensor requires little maintenance. Generally, the sensor needs maintenance
when the response becomes sluggish or noisy. In clean water the typical cleaning frequency is once a month. In
water containing large amounts of suspended solids, for example open recirculating cooling water, cleaning fre-
quency will be substantially greater.
8.3.2 Cleaning the Sensor
Remove soft deposits by rinsing with a stream of water from a wash bottle. If the sensor becomes coated with
rust, dissolve the rust by soaking the sensor in dilute citric acid (dissolve 5 grams of citric acid crystals in 100 mL
of water) for no longer than 30 minutes at room temperature. Rinse the sensor thoroughly with water and soak
in pH 4 buffer for several hours. Recalibrate the sensor in buffers before returning it to service.
8.3.3 Other Maintenance
The 3900VP-02-10 pH sensor supplied with the Model FCL-02 is disposable. It has no replaceable parts.