Harwil - Model L-21N & L-21VCR - Level Switch - Datasheet

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. Interchangeable differential band modules, for all non-L-21+ versions, allow for 5 minute on-site switching of differentials from 1.0” to  2.0” to 3.0” to 5.0” in any sequence to satisfy variable operational requirements as they occur. Its large differential provides immunity to nuisance switch tripping due to severe wave action and turbulence. The large differential also provides very low cost single point pump up/pump down level control.