Siemens QBM4000 Series User manual

CE1N1919en01
201
9-10-09
Smart Infrastructure
s
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
No
QBM4000-3
S55720-S248
0...300 Pa
DC 0...10 V
No
QBM4000-10
S55720-S249
0...1000 Pa
DC 0...10 V
No
QBM4000-25
S55720-S250
0...2500 Pa
DC 0...10 V
No
QBM4100-1U
S55720-S251
-50...+ 50 Pa
4...20 mA
No
QBM4100-1D
1
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
or
Circuit breaker max. 13 A
Characteristic B, C, D according to EN 60898
or
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
<±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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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
18
11 86
80
92
ø 6,2
75
37
27,6
80
49
9,6
16,3
P2
P2
1919M01
5,5
P1 P2
Dimensions in mm
QBM4000-..
QBM4100-1.
Published by:
Siemens Switzerland Ltd.
Smart Infrastructure
Global
Headquarters
Theilerstrasse 1a
CH
-6300 Zug
Switzerland
Tel. +
41 58-724 24 24
www.siemens.com/buildingtechnologies
© Siemens Switzerland Ltd 2005
Delivery and technical specifications subject to change