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APPLICATIONS
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. 

 
PHYSICAL 
DATA
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 L4 FLOTECTŽ Level Switches




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)