Data Sheet for Product
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Siemens Differential pressure sensor QBM4000…/ QBM4100… CE1N1919en01
Smart Infrastructure 2019-10-09
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