Emerson PN 51-FCL-1056 Constant Head Flow Controller, Cleaning the flow controller

MODEL FCL-1056	SECTION 8.0
	MAINTENANCE

8.4 CONSTANT HEAD FLOW CONTROLLER

8.4.1 General

After a period of time, deposits may accumulate in the constant head overflow chamber and in the tubing leading to the flow cell(s). Deposits increase the resistance to flow and cause the flow to gradually decrease. Loss of flow may ultimately have an impact on the chlorine sensor performance. The flow controller is designed to provide about 2 gal/hr (120 mL/mm) flow. Loss of flow to about 1 gal/hr (60 mL/mm) causes about a 5% decrease in chlorine sensor output. Loss of flow has almost no effect on pH sensor performance other than to increase the overall response time.

8.4.2 Cleaning the flow controller

The low flow controller can be taken apart completely for cleaning. Use a strong flow of water to flush out the tub- ing. A pipe cleaner or a small bottlebrush can remove more adherent deposits. To prevent leaks, apply a thin layer of silicone grease (or equivalent) to the two O-rings at the base of overflow chamber and to the O-ring sealing the central overflow tube to the base.

8.4.3 Other Maintenance

Table 8-2 and Figure 8-2 show the replacement parts for the flow controller assembly used in Model FCL-01. Table 8-3 and Figure 8-3 show replacement parts for the flow controller assembly used in Model FCL-02.

56