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MIW-DPD-X-EN-001 - 09 / 04 / 2020
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Fig. 3 Wiring and connections
GND
GND
GND
/B
Vin
A
AO1
AO2
5.
Switch on the power and perform a calibration procedure (refer to section
“OPERATING INSTRUCTIONS”) .
6.
Connect the nozzles to the duct (see
Fig. 4
). Depending the application you must
use a specific connection set to connect the nozzles of the unit to the duct:
6.1
To measure differential pressure, use PSET-QF or PSET-PVC set (pressure
measurement is the unit default setting);
6.2
To measure volume flow, use PSET-PT Pitot tube connection set, PSET-QF
or PSET-PVC connection set. If you use PSET-PT, you should enter the duct
cross sectional area [cm²] in Modbus holding register 63 for sensor module
1 or in holding register 83 for sensor module 2. If you use PSET-QF or PSET-
PVC, enter the K-factor of the fan (provided by the fan /motor manufacturer)
in Modbus holding register 62 for sensor module 1 or in holding register 82 for
sensor module 2.
In case the K-factor is not known, volume flow is calculated from a duct cross
sectional area (holding register 63 for sensor module 1 or in holding register
83 for sensor module 2) multiplied by air velocity (Pitot air velocity (holding
register 64) should be enabled and Pitot tube connected).
6.3
To measure air velocity, use PSET-PT set and enable Pitot tube air velocity via
holding register 64 for sensor module 1 or in holding register 84 for sensor
module 2. In this case the K-factor of the fan has to be 0.
DUAL DIFFERENTIAL PRESSURE
TRANSMITTER WITH DISPLAY
DPD
