Function; Transmitter-, Min-/Max Function; Relative Pressure Sensor (Positive Pressure); Differential Pressure Sensor - Honeywell krom schroder DG Smart Technical Information

4 Function

4 Function

4 . 1 Transmitter-, MIN-/MAX function

The pressure is detected by a sensor, processed and com-
municated via an analog value on the display and made
available for signal processing to the higher-level control
system.
The transmitter function is set as the factory default. The
function can be extended by MIN, MAX monitoring. See
parameter Sensor function.
The MIN-/MAX function detects small pressure differences
via the sensor system. If a MAX or MIN switching value is
reached, it is processed and communicated to the high-
er-level control system via a safe 4–20 mA signal and/or a
safety bus protocol.
4 .2 Relative pressure sensor (positive
pressure)
Relative pressure measurement is used to monitor the MIN/
MAX switching pressure, e.g. in a blower application.
The relative pressure sensor records the difference between
the ambient pressure and port P1 or P2.
P2
P3
P1
Gas, air, flue gas, biogas
The relative pressure is measured at port P1 or P2. The un-
used port remains closed.
DG smart · Edition 09.23 · EN

4 .3 Differential pressure sensor

Differential pressure measurement is used, for example, to
safeguard an air flow rate or to monitor filters and fans.
The sensor records the difference between ports P1 and
P2.
P3
Use port P1 for the higher absolute pressure (relative pres-
sure) and P2 for the lower pressure.
P2
P1
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