Siemens QBM4000 Series User manual

CE1N1919en01

201

9-10-09

Smart Infrastructure

1919

QBM4000-..., QBM4100-1U QBM4100-1D

Differential pressure

sensor

QBM4000...

QBM4100...

For air and non-aggressive gases, with calibration certificate.

•Calibration certificate from the factory

•High degree of measuring accuracy

•Pressure-linear characteristic curve

•Operating voltage AC 24 V / DC 13.5…33 V or DC 11…33 V

•Output signal DC 0...10 V or 4…20 mA

•Simple and fast mounting thanks to integrated fixing angle bar in the

housing

•Calibrated and temperature-compensated measuring signal

•Excellent long-term response

•Supplied with connection set

•Very short reaction time

•Display* indicates the present differential pressure

* Depending on type

Use

The differential pressure sensor acquires differential, over and under pressure of

air and nonaggressive gases if a high degree of measuring accuracy and quality is

required as well as a requirement for a calibration certificate.

Fields of application:

•Measuring slightest differential pressures in ventilation and air conditioning ducts

•Check air flows

•Monitor filters and control fans

•Pressure supervision in labs, production, storage and clean rooms

•For acquiring variable air flow in VAV plants on the supply and extract air side

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Type summary

Type (ASN) Product number (SSN) Measuring range Output signal LCD

QBM4000-1

S55720-S247

0...100 Pa

DC 0...10 V

QBM4000-3

S55720-S248

0...300 Pa

DC 0...10 V

QBM4000-10

S55720-S249

0...1000 Pa

DC 0...10 V

QBM4000-25

S55720-S250

0...2500 Pa

DC 0...10 V

QBM4100-1U

S55720-S251

-50...+ 50 Pa

4...20 mA

QBM4100-1D

S55720-S252

0...100 Pa 4...20 mA Yes

1 Type with digital display.

100 Pa = 1 hPa = 1 mbar

Ordering and delivery

When ordering a differential pressure sensor, please specify the quantity, type, and

product name.

Type (ASN)

Product number (SSN)

Product designation

QBM4000-1 S55720-S247 Differential pressure sensor with calibra-

tion certificate.

A round plug connector (Lumberg RKC 30/11) and a 2-meter PVC tube is included

with the differential pressure sensor.

Additional accessories may be ordered separately.

Accessories

Additional sets of air duct probes are available depending on measuring require-

ments. Various mounting brackets are also available depending on installation

location.

Type Name Data sheet

AQB2000 Mounting bracket, for mounting sensors in isolated

air ducts. N1590

AQB21.2

Top hat rail adapters (5 pieces) for DIN top hat rails,

HT 35-7.5 N1590

FK-PZ1

Air duct probe, short, stainless steel, with elastic

lead-through for simple, quick, and airtight mount-

ing.

N1589

FK-PZ2

Air duct probe, long, aluminum, with orifice plates

for precise measuring requirements.

N1589

Mode of operation

The sensor acquires the differential pressure using a silicon rubber membrane and

ceramic bar. The sensor generates as per the deflection, a linear and temperature-

compensated output signal DC 0...10 V or 4...20 mA.

Conversion

Example

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Design

The differential pressure sensors consist of:

•Sensor housing with fixing angle bar, 3-pin plug and hinged lid with sealed safety

screw

•Pressure chamber with membrane and ceramic lever

•Circuit board

•LCD display for the digital display of the sensor signal in Pa (for QBM41…D only)

1919Z01

1 2 3 43

1 3-pin plug

2 Display window (on QBM4100-1D only) for the digital display of the sensor

signal

3 Connection nipples (see "Mounting notes")

4 Sealed safety screw for hinged cover

Mounting and installation notes

The differential pressure sensor is suited for direct mounting on air ducts, walls,

ceilings, or in control panels.

The sensor must be installed vertically.

The supplied 2 meter plastic tubing can be modified to the duct connection on the

plant.

To achieve the housing protective class indicated under "Technical data", the dif-

ferential pressure sensors must be mounted with the pressure nipple facing down.

In addition, they should be higher than the air duct probes.

If the pressure connection nipples point upward or are at a lower level than

the air duct probes, condensation can collect inside the sensor, causing

damage to the device.

The pressure tubing for the sensor nipples are connected as following to the differ-

ential pressure sensors:

On the air duct side

On the pressure sensor side

Tubing with higher pressure side

(lower vacuum)

Connect to pressure nipple "P1" or "+".

Tubing with lower pressure side

(higher vacuum)

Connect to pressure nipple "P2" or "−".

The sensor is supplied with mounting instructions.

Refer to the Manual sensor installation from the BT download center for additional

information.

•Power supply by SELV or class 2 power supply with limited output of 15 W or

less. (UL requirement)

•Use only copper wiring

Display, setting, and

connection elements

Key

Caution

Note

Caution

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Commissioning notes

The values indicated under "Technical data" apply only to vertically mounted differ-

ential pressure sensors (connection nipples pointing down).

The sensor is calibrated at the factor in the vertical position. As a consequence, the

sensor must be installed in the vertical position. For horizontal installation (hous-

ing cover top or bottom), deviations occur to measured values that negate the

measured values on the certificate.

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 gar-

bage.

•Dispose of the device via the channels provided for this purpose.

•Comply with all local and currently applicable laws and regulations.

Technical data

Power supply Safety extra low voltage (SELV/PELV)

or class 2 (UL)

QBM4000-...

3-wire connection Operating voltage

Power consumption

Current draw

AC 24 V ±15 %, 50/60 Hz or DC 13.5...33

< 0.5 VA

< 10 mA

External supply line protection Fuse slow max. 10 A

Circuit breaker max. 13 A

Characteristic B, C, D according to EN 60898

Power source with current limitation of max. 10 A

Output signal DC 0...10 V, RLast > 10 k

Ω

(not galvanically

separated, 3-wire connection, short-circuit proof,

protected against reverse polarity)

QBM4000-...

2-wire connection Operating voltage

for ohm loads up to 500 Ω.

Power consumption

Current draw

DC 8...33 V

DC 18…33 V

<0.7 VA

4...20 mA

Output signal 4...20 mA

][

A0,02

V8tagesupply vol

Rload Ω

−

2-wire technology, short-circuit proof, protected

against reverse polarity).

Product data

Measuring range

Refer to "Type summary"

Sensing element

Piezo-resistive (silicone membrane, ceramic bar)

Degree of measuring accuracy at required

installation position and room temperature

25 °C.

(FS = Full Scale)

QBM4100

-1U Sum from zero point, linearity, reproducible

and hysteresis.

TC zero point

TC sensitivity

<±1 %FS (<±1 Pa)

<±0,1 % FS/°C

<±0,06 % FS/°C

Caution

Sensor calibration

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QBM4000-1

QBM4100-1D Zero point

Sum from linearity, reproducible and hysteresis.

TC zero point

TC sensitivity

<±1.0 % FS

<±1 % FS

<±0.1 % FS/°C

<±0.06 % FS/°C

QBM4000-3 Zero point

Sum from linearity, reproducible and hysteresis.

TC zero point

TC sensitivity

<±0.7 % FS

<±1 % FS

<±0.05 % FS/°C

QBM4000-10

QBM4000-25

Zero point

Sum from linearity, reproducible and hysteresis.

TC zero point

TC sensitivity

<±0.7 % FS

<±1 % FS

<±0.04 % FS/°C

<±0.02 % FS/°C

Long-term stability

±1.0% FS as per DIN IEC 60 770

Response time

Load change

<20 ms

<10 Hz

Tolerable overload on one side

on P1.

At P2

5,000 Pa

(10,000 Pa for types QBM4000 -10, -25)

400 Pa

Rupture pressure

at room temperature

at 70 °C

2 × overload

1.5 × overload

Display (QBM4100-1D only)

Display of:

LCD, 2-line, 8 position each, alphanumeric, not

background lit

Differential pressure in Pa.

Media

Admissible medium temperature.

Air and slightly aggressive gases

0...70 °C

Maintenance

Maintenance free

Degree of protection Protection degree of housing at recommended

installation

IP54 according to EN 60529

Protection class

III according to EN 60730-1

Connections Electrical connections 3-pin round plug with screw terminals 1.5 mm2

(Lumberg RKC 30/11)

Pressure connections PVC nipples

∅

6.2 mm, under pressure side is

designated as 'P2' or ' – '.

Environmental conditions Permissible ambient temperature

Operation

Transport and storage.

0...70 °C

-25...+70 °C

Permissible ambient humidity

<90 % r.h. (without condensation).

Directives, standards

Product standard EN 61326-1

Electrical equipment for measurement,

control and laboratory use. EMC require-

ments. General requirements

EU Conformity (CE)

RCM Conformity

CE1T1910xx_01 *)

CE1T1910en_C1

UL 60730-1 / UL 60730-2-6,

http://ul.com/database

Environmental compati

bility

The product environmental declaration

CE1E1916*) contains data on environmentally compat-

ible product design and assessments (RoHS compliance

, materials composition, packaging,

environmental benefit, disposal).

Dimensions (weight)

Weight (with packaging)

0.250 kg (with round plug connector).

Weight (with packaging), with display

0.263 kg (with round plug connector).

*) The documents can be downloaded from http://siemens.com/bt/download.

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Siemens Differential pressure sensor QBM4000…/ QBM4100… CE1N1919en01

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Connectors

Front view of the plug on the sensor housing (internally wired at the factory) or

the view of the connection side of the cable plug.

Terminal assignment

Operating voltage AC 24 V (SELV) or DC 13.5…33 V.

Output signal DC 0...10 V (reference point M)

GND

Front view of the plug on the sensor housing (internally wired at the factory) or

the view of the connection side of the cable plug.

Terminal assignment

Supply voltage DC 8…33 V.

Output signal DC 4…20 mA.

Dimensions

11 86

ø 6,2

27,6

9,6

16,3

1919M01

5,5

Dimensions in mm

QBM4000-..

QBM4100-1.

Published by:

Siemens Switzerland Ltd.

Smart Infrastructure

Global

Headquarters

Theilerstrasse 1a

-6300 Zug

Switzerland

Tel. +

41 58-724 24 24

www.siemens.com/buildingtechnologies

Delivery and technical specifications subject to change

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