Harwil - Model L-21N & L-21VCR - Level Switch
From Controllers & Relays
The L-21 is a low cost, high performance level switch made from highly durable plastics. It features a variable liquid level differential and a single point pump up/pump down level control.
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Details
The L-21 Level Switch can be ordered with level differentials of 1, 2, 3 or 5 inches. The L-21+ can be ordered with level differentials from 12 to 48 inches. The L-21’s large differential provides immunity to nuisance switch tripping due to wave action and turbulence. The large differential also provides very low cost single point pump-up/pump-down level control. No latching relay needed!
Maintenance and checkout is easy using any standard multimeter. Each unit comes with a detailed instruction manual and parts list.
- Working Fluid Specific Gravity : 0.7 minimum
- Working Temp : 200˚F (93˚C) Maximum
- Working Pressure : 250 psig (1.724 MPa)
- Process Connection : 1 1/4' NPT
- Electrical Switch : SPDT (single pole double throw) 15A
- Enclosure : NEMA 6P / IP 67
Uses
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Water Level Control in:
- Cooling Towers
- Plating Tanks
- Washing Tanks
- Reverse Osmosis
- Fish Farms
- Fountains & Pools
- Aquariums
Specifications
HYSTERESIS (Δ LIQUID LEVEL TO ACTIVATE/DEACTIVATE SWITCH)
≈ 5″ max. travel (N/VCR).
ELECTRICAL SWITCH CHARACTERISTICS
SPDT (single pole double throw) 15 A, 1/2 hp @ 125 or 250VAC .A @ 125VDC, .A @ 250VDC 4A @ 125VAC (Tungsten lamp load)
Note: Model L-21 employs magnetic coupling between float arm and switch body. Magnetic particles can accumulate on and around magnet housing which may affect proper operation. Please conduct appropriate fluid magnetic particle evaluation and operational tests prior to and during installation and use.
WORKING FLUID SPECIFIC GRAVITY
0.7 minimum
NOTE: Model L-21N employs magnetic coupling betwee...
NOTE: Model L-21N employs magnetic coupling between float arm and switch body. Magnetic particles can accumulate on and around magnetic housing which may affect proper operation. Please conduct appropriate fluid magnetic particle evaluation and operational tests prior to and during installation and use.
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