Fema DCM Series Assembly And Operating Instructions Manual page 35

1.32 Differential pressure switch
Pressure connection: 2 x G
Connect the high and the low pressure
according marks. A mistake of the pressure
connections may lead to malfunctioning.
1.4 Setting the switching pressure
internal thread.
[ HH
The switching pressure is set using the setting
spindle. Before setting loosen the setscrew
located above the scale by approx. 2 turns
and tighten it again after setting.
The scale value corresponds to the upper
switching point (for rising pressure). The lower
switching point (for falling pressure) is lower by
the switching difference. The scale serves as
estimated value scale, a pressure gauge is
required for accurate settings.
On terminal connection housings the setting
screw is available after removing the cover.
Caution: Switch off voltage.
S
P
High Low
Pressure P Pressure S
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