Model FlS Flood level Switch descriptive data Typical Model FlS applicaTionS Control Room The Model FLS, part number 53-4701-001, is a float operated, liquid level control designed for bracket mounting in floor level sumps or troughs. The proven Magnetrol magnetic coupling is employed to transmit float movement to a single snap-action dry contact switch mechanism. The switch is factory set for 3⁄4" level differential for off-on control—alarm and/or safety shutdown service. The Model FLS is used to detect leaks or spills from critical valves, vessels, and pipelines in power plant installations, as shown in Figure 1. Worldwide level and flow solution

SERIES B SWITCH MECHANISM Voltage +250° F maximum ambient temperature Simple and rugged in design, the Model FLS is constructed of quality materials throughout to assure reliable operation and a long trouble-free service life. FLOAT ENVELOPE A perforated stainless steel float envelope is welded to a forged steel bracket assembly totally enclosing the float and providing a side mounting surface. A stainless steel bottom strap, tack welded to the float envelope, acts as a low level float stop. FLOAT AND TRIM 300 series stainless steel float with a 400 series magnetic attraction sleeve. Internal...