The HL842 is designed for short measurements with a fixed 316S.S. rigid rod. There is no pre-set limit for rigid rod lengths, but the longer the rod gets, the more difficult it is to transport and install. Sitron recommends lengths no greater than 8 feet (2.43 m); for lengths greater than 8 feet (2.43 m) the HLC842, having no pre-set limit on cable lengths, is the ideal solution. The HLF842 has an electronic module in the probe's enclosure with a Zero/Span adjustment.

The HLF842 submersible pressure sensor uses a 316S.S. piezoresistive diaphragm filled with silicon to interface between the water and the sensing element. This silicone diaphragm is highly flexible and touches the sensing element, producing a sensor with exceptional linearity and very low hysteresis.

Pressure ranges from 0 to 4.5-PSI (0 to 0.3bar) gauge.