Data Sheet for Product

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Siemens Differential pressure sensor QBM3020.. / QBM3120.. CA1N1916en01
Smart Infrastructure 2019-10-09
Commissioning notes
The values indicated under "Technical data" apply only to vertically mounted differential
pressure sensors (connection nipples pointing down).
Value deviations are possible for horizontal mounting (housing cover on top or bottom).
These deviations can be compensated for by using the zero-point adjustment. See
"Zero-point adjustment" below.
The settings of the characteristic curve (pressure-linear / extracting-the-root) using a
DIP switch.
DIP switch Characteristic curve
*
Pressure-linear characteristic
curve
Extracting-the-root characteristic
curve
* Factory setting
See also Display, setting and connection elements
1. Wiring connection terminals – Do not connect pressure tubing at this time.
2. Press the zero-point adjustment button for more than 2 seconds until the LED briefly
lights up. The zero-point adjustment is additionally indicated on types with LCDs
with "0 Pa".
A menu opens if you press the zero-point button for less than 2 seconds on LCD
types. It closes automatically by multiple presses or a waiting period of 8 seconds.
3. Connect pressure tubing
Disposal
The device is considered electrical and electronic equipment for disposal in terms of the
applicable European Directive and may not be disposed of as domestic garbage.
• Dispose of the device via the channels provided for this purpose.
• Comply with all local and currently applicable laws and regulations.
Caution
Sensor calibration
Set characteristic curve
Zero-point adjustment