Siemens Differential pressure monitor QBM81...

Used as a flow switch or filter monitor in air ducts.
Supplied complete with set of 2 air duct connectors (plastic)
and 2 m long PVC tube.

Digital outputs 1-pin  Potential-free
Switchover contact
Permissible operating pressure 7500 Pa
Ambient temperature, operation -30...85 °C
Mounting position Diaphragm vertical, pressure connection pointing
downward
Digital output, switching voltage DC 24 V / AC 24...250 V
Digital output, switching current 0.01...5 (3) A
Pressure conneciton Connection branch, 6.2 mm dia.
Degree of protection IP54
Dimension (Ø x L) 81 x 90 mm

20…300Pa BPZ:QBM81-3 QBM81-3
50…500Pa BPZ:QBM81-5 QBM81-5
100…1000Pa BPZ:QBM81-10 QBM81-10
500…2000Pa S55720-S125 QBM81-20
1000…5000Pa S55720-S126 QBM81-50