SIEMENS Air Duct Differential Pressure Sensor QBM3020-1
● High degree of measuring accuracy
● Adjustable characteristic curve (pressure-linear or extracting-the-root)
● Operating voltage
– QBM3020-..: AC 24 V / DC 13,5…33 V
– QBM3120-..: DC 8…33 V
● Output signal
– QBM3020-..: DC 0…10 V
– QBM3120-..: 4…20 mA
● Zero-point adjustment
● Simple and fast mounting thanks to integrated fixing angle bar in the housing
● Maintenance free thanks to excellent long-term response
● Calibrated and temperature-compensated measuring signal
● Supplied with PVC tubing
● Very short reaction time
Description
SIEMENS Air Duct Differential Pressure Sensor QBM3020-1
Differential Pressure Sensor
Mode of operation
The sensor acquires the differential pressure using a silicon rubber membrane and ceramic
bar. Depending on the type of sensor, the sensor generates a linear or extracting-the-root
signal DC 0…10 V on the QBM3020-.. or 4…20 mA on the QBM3120.. that is calibrated and
compensated for temperature. For extracting-the-root sensors can be adapted individually
using the potentiometer.
Mechanical design
The differential pressure sensor consists of:
● Sensor housing with mounting bracket, cable entry, and removable snap-on cover with
safety screw
● Pressure chamber with membrane and ceramic lever
● PCB with terminal connections, DIP switch to switch the characteristic curve and potentiometer for optional end value setting on extractingthe-root characteristic (0… 10 V or 4…20 mA output), LCD on QBM3020-..D and
QBM3120-..D.
● Zero-point adjustment button to compensate for mounting position.
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