QBM81系列 壓力開關 Differential Pressure Switch QBM81


  • 壓差開關/感測器
  • 壓力感測範圍:20…5000Pa(依型號而不同)
  • 應用於風車,濾網之空調通風系統氣流壓差偵測
貨號: qbm81 分類:


For air and nonaggressive gases

  • For ventilation and air conditioning plants
  • To monitor air filters, air flow, fan belts
  • To monitor pressure in clean rooms, kitchens etc.
  • Easy to mount
  • >1 mio switching cycles
  • Highly precise setting
  • Long-term stability

Siemens Differential Pressure Switch QBM81-…

In ventilation and air conditioning plants to:
Monitor differential pressure, underpressure and overpressure
Monitor air filters and air flows
Recognize torn fan belts
Differential pressure switches can be used in clean rooms, kitchens, etc.

TypePressure range(mbar)(Pa)(inH2O)
QBM81-30,2…3 mbar20…300 Pa0.08…1.2 inH2O
QBM81-50,5…5 mbar50…500 Pa0.2…2 inH2O
QBM81-101…10 mbar100…1000 Pa0.4…4 inH2O
QBM81-205…20 mbar500…2000 Pa2…8 inH2O
QBM81-5010…50 mbar1000…5000 Pa4…20 inH2O

下載型錄 : [download id=”261″]




QBM81-3, QBM81-5, QBM81-10, QBM81-20, QBM81-50

Dimensions (W x H x D)

88 x 110 x 90 mm

Connection, electrical

Screw terminals

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


Dimension (Ø x L)

81 x 90 mm