Data Sheet for Product

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Siemens Differential pressure sensor QBM3020.. / QBM3120.. CA1N1916en01
Smart Infrastructure 2019-10-09
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 (see
Commissioning notes) and potentiometer for optional end value setting on extracting-
the-root characteristic (0…10 V output or 4…20 mA output respectively)
• LCD on QBM3020..D and on QBM3120-..D
• Zero-point adjustment button to compensate for mounting position
(see "Commissioning notes")
1916Z01_01
1
2 3
4
65 7 8 9
1 Cable entry gland Pg 11 with cable strain relief
2 Push-button for zero-point adjustment
3 LCD (QBM3020-..D and QBM3120-..D), to digitally display the sensor
signal in Pascal
4 DIP switch to change the characteristic (see "Set characteristic curve
under "Commissioning notes")
5 Connection nipples (see "Mounting notes")
6 Potentiometer to set amplification at extracting-the-root output characteristic
7 Terminal block
8 Safety screw for hinged cover
9 LED for zero-point adjustment
Display, setting and
connection elements
Key