Metabo Dry-running Sensor Hydrostop User Manual download pdf (Page 9)

Hydrostop

2.2

The dry-running sensor may only be used with garden irrigation systems and pond

pumps or similar. It must not be used in liquid food handling installations (drinking

water or drinks).

Note:

Pumps designed for pumping liquids cannot prime air for a prolonged period:

the pumped liquid provides – similar to the oil in an automobile engine – lubri-

cation and cooling. If the liquid is absent the pump can be damaged. 

The Hydrostop dry-running sensor prevents a pump priming air. It is installed

in the pump’s discharge line. As long as there is water in the line, the water

pressure is sensed by a pressure-sensing switch, closing the circuit supplying

the power to the pump, and the pump runs. If no liquid is pumped, the spring-

actuated pressure-sensing switch opens the supply circuit, and the pump

stops.



Operating controls

1. Plug

2. Tee fitting,

threaded

3. Sensor enclosure

4. Female connector

5. Push-button

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Metabo Dry-running Sensor Hydrostop User Manual Page 9