User Manual

3
Smart Infrastructure
A6V11684000_en
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2021
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02
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24
Use
Focus segment
● Air handling units (AHU), with communication between controller and field devices
and connected to cloud enabling plant digitalization.
● Support of Ecodesign directive ErP 2016/2018 through the use of bus-compatible
sensors for monitoring filters, including cloud visualization.
Field of application
The QBM3700.. Modbus air pressure sensor and I/O extension is used in ventilation sys-
tems and air handling units (AHU):
● To measure and monitor pressure in air ducts and over filters and fans
● On the supply and extract air side
The QBM3700.. is ideally suited for a multitude of tasks in the HVAC industry:
● Measures relative and differential pressure and flow of air and non-aggressive gases
● Available with a differential pressure sensor
● Allows monitoring of pressure or volume flow at two individual points in the system
Topology
AHU topology with Modbus field devices and sensors
● The following digital AHU topology illustrates an example for using the QBM3700..
T
T
T
 p
 p
T
 p
 p

p
T
T
Modbus
VSD
QBM3700..
VSD
QBM3700..
Control
QBM3700..
QBM3700..