Function - Grundfos DPI Montage- Und Betriebsanleitung

5. Function

The sensor measures the differential pressure between the high pressure
(P1) and the low pressure (P2). It may for example be the differential
pressure between the flanges on the suction and discharge side of a pump.
Fig. 2 DPI with position of P1 and P2
Connect the sensor to the pressure gauge tappings of the pump flanges or to
other measuring points in the system by means of 7/16"-20 UNF copper
capillary tubes.
The pressure measurement is carried out by a silicon chip covered with a
special coating developed by Grundfos.
The sensor signal is sent to an external controller or to a motor controller.
The sensor is supplied with power from an external voltage supply or direct
from the terminal box of the motor.
P2
P1
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