Water Detection Sensor; Water Detection Sensor Installation - Lorentz PSk2-7 Manuel D'installation Et De Fonctionnement

Potential problems with the well probe in surface
water – The probe has a moving float. It is highly resistant
to deposits and debris. However, the float can become stuck
where algae or water creatures are present in surface water.
Possible solutions are:
ƒ Fix the probe independently of the pump and pipe
(clamped to a weight, but not to the drop pipe). This
way, it can be pulled out for inspection or cleaning
without the need to lift the pump. (This may not be
feasible if the well casing is smaller than 6 in)
ƒ Pull the probe out periodically (with the pump, if neces-
sary) for testing and inspection. The pump should stop
a few seconds after the probe leaves the water.
ƒ Wrap the probe in a protective screen (fiberglass
window screen, for example).
ƒ Use a different type of float switch. You can use any
switch that makes contact on rise (normally open).
Use an encapsulated switch instead of the well probe
if there is enough space for it to operate properly, for
example the LORENTZ float switch.
CAUTION – Never let the pump run dry.
Dry running will damage the pump and
void the warranty. LORENTZ requires a dry
run protection for every pump system.
CAUTION – The well probe must be
positioned vertically, within 10°. If the
pump is not to be installed vertically, find
an alternative way to mount or suspend
the probe, so that it is located higher than
the pump, and in a vertical position.
Pump Accessories Installation

10.2 Water detection sensor

The water detection sensor protects the surface pump from
dry run. It is ONLY installed with surface pumps.
For operation with submersible pumps the terminals 5 and
6 need to be bypassed with a jumper cable. If the jumper is
not in place the controller will show "Source Low" and the
pump will not run.
CAUTION – For submersible pumps a
jumper cable between the terminals 5 and
6 has to be installed.
CAUTION – If the water level of the water
source drops below the inlet of the
suction pipe the pump will suck in air
together with the water.
CAUTION – Air inside the suction pipe can
lead to cavitation and/or dry running of
the pump.
The terminals 5 and 6 inside the PSk2 controller are for
connecting the LORENTZ water detection sensor, cf. chapter
"8.5.3 Terminal description" on page 27.

10.2.1 Water detection sensor installation

This section is for the installation of the LORENTZ water
detection sensor only. This guide is not universally applicable
for sensors of other suppliers/manufacturers.
LORENTZ recommends using a water detection sensor to
protect the pump against water shortage.
WARNING – Running the pump complete-
ly dry will damage the pump within
seconds and void the warranty. The
purpose of the water detection sensor is
to sense the loss of water and turn the
pump off before it can run dry.
The sensor has to be installed close to the pump inlet.
If the controller detects dry running it will stop the pump.
Following a run dry situation the pipeline must be refilled
manually. Check the pipeline for leakage.
The controller will delay the restart after the pipeline has
been refilled for 15 minutes.
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