Harwil Corporation 541 Kinetic Drive Oxnard, CA 93030 Phone: 805.988.6800
800.562.2447 Fax:
Product Catalog MODEL - L-21N
Component Recognized (E85349) U.S. Patent No. 5,159,305
LOW COST - HIGH PERFORMANCE - ALL PLASTIC UNITS Feature Variable Liquid Level Differential PLUS Single Point Pump Up/Pump Down Level Control
Four field replaceable liquid level differential bands are standard.
H = 1.0"
H = 2.0"
H = 3.0"
H = 5.0"
Interchangeable differential band modules allow 5 minute on site switching of differential from 1.0" to 2.0" to 3.0" to 5.0" in any sequence to satisfy variable operational requirements as they occur.
Large Differential provides immunity to nuisance switch tripping due to severe wave action and turbulence.
Large Differential also provides very low cost single point pump up/pump down level control.
11 amp 120/240 VAC SPDT Switch allows direct control of 1/3 hp pumps, 1.2 kw heaters, motor contactors, solenoid valves, etc.
Special units with Gold Cross Bar/SPDT contacts allow dry circuit interfacing with computer and PLC controllers.
Intrinsically safe relay allows Model L-21 to be used in hazardous area.
Temperature to 200°F continuous at 75 psig
Pressures to 250 psig at 75°F
Maintenance and checkout is a snap for plant maintenance personnel using any standard multimeter.
Each unit comes with detailed Instruction Manual and Parts List.
Plastic test strips are available for testing in your particular "real world" chemical environment.
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.
(E85349)
H = 1.0" 
