Gestra NRS1-52 Low & High Level Alarm Switch 24VDC
The level switch NRS 1-52 operates in conjunction with level electrodes NRG 16-.. and ER 5, and functions as a limit switch (for instance) in steam boiler and (pressurized) hot-water installations.

The level switch detects and indicates a MIN and a MAX water level.
The level switch can work with the following level electrodes: NRG 10-52, NRG 16-52, NRG 16-36, NRG 16-4 and ER 5.-1.

The level switch NRS 1-52 operates using the conductive measuring principle of the electrical conductivity of the water for signalling the water level. The level switch has been designed for differing electrical conductivities and connecting two level electrodes.

The length of the associated electrode rod determines the MIN and MAX water level switch points.

The level switch detects that the MIN or MAX water level is achieved when the corresponding electrode rod is exposed or submerged. After the de-energizing delay has elapsed, the MIN or MAX output contact is switched over. At the same time, the MIN or MAX LED changes from green to red.

A "Test" button allows the simulation of a MIN or MAX alarm.