Float Switch- Model L4
Protects against high or low liquid level. Magneticaly operated switch-leak proof body.
Compact and reliable, the Model L4 Float Switch uses the time-tested Model V4 Flotect Switch body to provide dependable liquid level control to start or stop pumps, open or close valves - or actuate alarm signals. Installed in thousands of tanks and processing plants around the world, this unique magnetically actuated switching design gives superior performance. There are no bellows, springs, or seals to fail. Installed through a 1 1/2" thredolet welded to tank, the unit is easily field installed or replaced. The electrical assembly may be quickly replaced without removing the switch from the tank. Float arm hinge design limits the arm angle to prevent vertical hangup. Float is 316 stainless steel for service with compatible corrosive fluids. For use in fluids with specific gravity down to 0.7.
Features include: Simplicity of design and a leak proof switch body, machined from bar stock for pressures to 2000 PSIG, (140kg/cm2), it eliminates the possibility of process fluids entering the switch compartment. The threaded conduit enclosure cover permits easy inspection or replacement of electrical assembly without shutting down the system, or removing electrical conduit. Power must be disconnected. The unit fits directly into tank with a thredolet or flange for easy installation. All units are explosion-proof and listed with UL. and C.S.A. for Class I, Groups C and D, Class II, Groups E, F and G or are flame-proof to CENELEC/SAA EExd IIB T6.
The L4 Float Switch maintains predetermined liquid levels in tanks through direct pump control. Also used to control sump levels, scrubber system liquid levels and automatic tank dump operations. Controls levels or provides alarms for hydro-pneumatic tanks, low pressure boilers and various waste water and sewage treatment processes. With a special L-shaped float arm, it can be mounted vertically in tank top for tank overflow or alarm.
| Temperature Limits: | Standard 275°F (135°C). High temperature, MT option (not U.L., C.S.A. or CENELEC/SAA), 400°F (205°C) max. |
|---|---|
| Operating Pressure: | Body 1000 PSIG (70kg/cm2) Float 100 PSIG (7kg/cm2). See Float data below for other pressures. |
| Electrical Rating: | U.L. and CENELEC/SAA: 10A @ 125/250 VAC. C.S.A.: 5A @ 125/250 VAC, 5A resistive, 3A inductive @ 30 VDC. Optional ratings (not U.L., C.S.A. or CENELEC/SAA); MV option: Gold contacts for dry circuits. Rated 1 amp @ 125 VAC, 1 amp resistive, 1/2 amp inductive @ 30 VDC. MT option: 400°F (205°C) 5 amp @ 125/250 VAC. |
| Wiring: | UL./C.S.A. unit; 16 gauge copper wire, 6" (152mm) long, mechanically and solder bonded to switch. CENELEC/SAA unit: Terminal board. |
| Switch Body: | One piece milled and bored Brass or 316SS. |
| Float: | 316SS, l 5/8" x 5" (41mmx127mm), std. 100 PSIG (7kg/cm2) min. SG 0.7 Trim includes 430SS and silver solder. Optional floats: 316SS 150 PSIG (10kg/cm2) min. SG 0.7. 304SS 300 PSIG (21 kg/cm2) min. SG 0.7. 304SS 50 PSIG (3.5kg/cm2) min. SG 0.5. Optional floats, 2 1/2" OD (64mm) spherical. |
| Piping Connection: | 1 1/2" NPT std. for mounting in 1 1/2" thredolet. 2 l/2" NPT required for optional floats. For other mounting see application page. Thredolet fittings available. |
| Protection: | NEMA-4 watertight (IP56) standard. |
| Installation: | Horizontal installation standard. Vertical installation available. |
| Weight: | 4 lb. 9 oz. (2.07kg). |
| Options: | All 316SS wetted parts. Floats for light fluids, high pressure, and corrosive service. DPDT circuit. |
| Standard Dead Band: | 3/4" (19mm) approx. |
| Model No. | Description |
|---|---|
| L4 | Brass, Side Wall Mounting |
| L4-SS | 316SS* Side Wall Mounting |
| L4-TOP | Brass, Vertical (Top Mounting) |
| L4-SS-TOP | 316SS* Vertical (Top Mount) |
Suggested Specification:
Liquid level switches shall be operated by a type 316 stainless steel float via magnetic linkage. Wetted parts shall all be metal. No elastomeric or plastic O-rings, diaphragms or packing shall be required to contain process fluid. Switches shall be weather-proof and explosion-proof Switches shall be W.E. Anderson No. L4