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Installation Instructions

Document No. 129-903 

October 4, 2013

 

Air Differential Pressure Sensors 

 

 

Item Number 129-903, Rev. BA

 

Page 1 of 2 

Product Description 

The Siemens QBM Series Air Differential Pressure 
Sensors use a well-proven ceramic technology. 
They deliver temperature-compensated sensor 
signals for registering airflow in HVAC systems and 
for the measurement of differential pressures in 
environmental, laboratory and cleanroom 
applications. 

Product Numbers 

Product Number 

Percent 

Accuracy 

Pressure 

Range 

Inches WC

(Water 

Column) 

QBM310/- 

0.25 

QBM3100U1 1 

QBM3100U2.5 2.5 

QBM3100U5 5 

QBM3100U10 

+/-1% FS 

10 

Contents 

 Sensor 

 Conduit 

Adapter 

Warning/Caution Notations 

WARNING: 

 

Personal injury/loss of life may 
occur if you do not follow the 
procedures as specified. 

CAUTION: 

 

Equipment damage/loss of 
data may occur if you do not 
follow the procedures as 
specified. 

Required Tools 

 

Small, Phillips screwdriver 

 

Small, flat-blade screwdriver 

 Adjustable 

wrench 

Expected Installation Time 

30 minutes 

Prerequisites

 

Even though the device is protected against electro-
magnetic interference, installation and cabling must 
be carried out correctly to ensure interference 
immunity. 

 

Use shielded cables for the signal and control 
lines with the connecting lead of the shield 
being kept as short as possible. The connection 
point of the shielding depends on the existing 
connection conditions. 

 

Never route signal and control cables together 
with the trunk line or feeder cables of motors, 
cylinder coils, rectifiers, and so on. The cables 
must be routed in conductive and grounded 
cable conduits. This applies especially to long-
distance cables, or environments where the 
cables are exposed to strong radio waves from 
broad casting stations. 

 

CAUTION: 

 

 

Prior to mounting or removing the 
sensor, verify that the system is 
depressurized. 

 

Do not mount sensors in locations 
subject to high pressure pulses. 

 

Significant thermal changes in the 
sensor environment can lead to a zero 
shift. As a result, the measuring value 
displayed in a depressurized state will 
read zero. This kind of drift can be 
corrected by zero point reset. 

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