Dry-running protection for water pumps is one of the most important monitoring functions, as bearings and shaft seal may be damaged if the booster pumps run dry. It is thus always recommended to install dry-running protection on all booster sets.
There are three different methods for detection of water shortage:
- Pressure switch on suction manifold or float switch/electrode relay in the supply tank: Dry-running protection with pressure/level switch.
- Measurement of inlet pressure in the suction manifold by means of an analogue pressure transmitter: Dry-running protection with pressure transmitter.
- Measurement of level in the supply tank by means of an analogue level transmitter: Dry-running protection with level transmitter.
Many Grundfos pumps and boosters are protected against dry running as standard.