Siemens QBM Series Manuel utilisateur

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)

QBM3100U025U +/- 0.25

QBM3100U1 1

QBM3100U2.5 2.5

QBM3100U5 5

QBM3100U10

+/-1% FS

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.

Document No. 129-903

Installation Instructions

October 4, 2013

Installation

Wiring Diagram

Recommended mounting positions:

•Vertical, with the pressure connections

facing downward, drain off possible

condensed water (factory calibration).

•Horizontal, with the cover facing downward.

•Horizontal, with the cover facing upward.

NOTE: Mount the transmitter with a minimum 0.39

inches (10 mm) distance to magnetic

material. If this is not possible there may be

an error of up to -.004 inch WC for

transmitters mounted on sheet steel.

Figure 3. Wiring Diagram, 4 to 20 mA.

Tubing Connections

SSEN0024R2

Figure 1. Recommended Mounting Positions.

ZP – Push Zero Point Reset

The installation position is variable by using the Zero

Point Reset button. Pressure variations can be reset

after installation.

Ensure the power supply is not interrupted when

storing customer settings (ZP – reset).

Figure 4. High and Low Pressure Connections.

The installation is now complete.

Figure 2. ZP Push Zero Point Reset.

Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and

models as design improvements are introduced. Product or company names mentioned herein may be the trademarks of their respective

Siemens Industry, Inc.

Building Technologies Division

1000 Deerfield Parkway

Buffalo Grove, IL 60089-4513

USA

+1-847-215-1000

Your feedback is important to us. If you have

comments about this document, please send them

to SBT_technical.editor.[email protected]

Document No. 129-903

Printed in the USA

Page 2 of 2

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