| 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
CE1N1919en01
2014-07-30 Building Technologies
Type summary
| Type (ASN) |
Product number (SSN) |
Measuring range |
Output signal |
LCD indication |
| 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 calibration 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 requirements. 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 mounting. |
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 temperaturecompensated output signal DC 0...10 V or 4...20 mA.
Conversion
Example
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Siemens Differential pressure sensor QBM4000…/ QBM4100… CE1N1919en01
Building Technologies 2014-07-30
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
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 differential 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 differential 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.
Display, setting, and connection elements
Caution
Note
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Siemens Differential pressure sensor QBM4000…/ QBM4100… C
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