Emerson PN 51-FCL-1056 instruction manual PH Sensor, Cleaning the Sensor, Other Maintenance

MODEL FCL-1056	SECTION 8.0
	MAINTENANCE

		FIGURE 8-1. Chlorine Sensor Parts
TABLE 8-1. Spare Parts
	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)

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.

55