Data Sheet for Product

ManualsBrandsSiemens ManualsSensors PressureDifferenzdruckfühler QBM3020-...

CA1N1916en01

2019-10-09

Smart Infrastructure

916

QBM3x20-.. QBM3x20-..D

Differential pressure

sensor

QBM3020-

QBM3120-..

for air and non

-aggressive gases

• High degree of measuring accuracy

• Adjustable characteristic curve (pressure-linear or extracting-the-root)

• Operating voltage: QBM3020-..: AC 24 V / DC 13.5…33 V

QBM3120-..: DC 8...33 V

• Output signal: QBM3020-..: DC 0...10 V

QBM3120-..: 4…20 mA

• Zero-point adjustment

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

• Maintenance free thanks to excellent long-term stability

• Calibrated and temperature-compensated measuring signal

• Supplied with plastic tubing

• Very short response time

• Actual value display*

Depending on type

Application

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.

It is also suited for measuring volume flow via differential pressure since the output

signal can be set to extracting-the-root.

Fields of application

• Measuring the slightest differential pressures in ventilation and air conditioning ducts

• Check air flows

• Monitor filters and control fans

• Pressure supervision in labs, production, and clean rooms

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

Summary of content (10 pages)

PAGE 1
s 1 QBM3x20-.. 916 QBM3x20-..D Differential pressure sensor QBM3020-.. QBM3120-.. for air and non-aggressive gases • High degree of measuring accuracy • Adjustable characteristic curve (pressure-linear or extracting-the-root) • Operating voltage: QBM3020-..: AC 24 V / DC 13.5…33 V QBM3120-..: DC 8...33 V • Output signal: QBM3020-..: DC 0...10 V QBM3120-..
PAGE 2
Type summary Type (ASN) Product number (SSN) Output signal Pressure measuring ranges Standard End value can be set 2 QBM3020-1U S55720-S233 - 50...+ 50 Pa ± (30...50) Pa DC 0…10 V QBM3020-1 S55720-S234 0...100 Pa 50...100 Pa DC 0…10 V QBM3020-3 S55720-S235 0...300 Pa 100...300 Pa DC 0…10 V QBM3020-5 S55720-S236 0...500 Pa 300...500 Pa DC 0…10 V QBM3020-10 S55720-S237 0...1000 Pa 500...1000 Pa DC 0…10 V QBM3020-25 S55720-S238 0...2500 Pa 1600...
PAGE 3
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.
PAGE 4
Mechanical design The differential pressure sensor consists of: • Sensor housing with mounting bracket, cable entry, and removable snap-on cover with safety screw • Pressure chamber with membrane and ceramic lever • PCB with terminal connections, DIP switch to switch the characteristic curve (see Commissioning notes) and potentiometer for optional end value setting on extractingthe-root characteristic (0…10 V output or 4…20 mA output respectively) • LCD on QBM3020..D and on QBM3120-..
PAGE 5
Engineering notes The transformer used must be suited for safety extra low voltage (SELV) when using an AC power supply. It must have separate windings and be designed for 100 % duty. Transformer size and fuse must comply with local safety regulations. Observe maximum permissible cable lengths.
PAGE 6
Commissioning notes Caution The values indicated under "Technical data" apply only to vertically mounted differential pressure sensors (connection nipples pointing down). Sensor calibration Value deviations are possible for horizontal mounting (housing cover on top or bottom). These deviations can be compensated for by using the zero-point adjustment. See "Zero-point adjustment" below.
PAGE 7
Technical data Electrical interface Power supply Safety extra low voltage (SELV/PELV) or class 2 (UL) QBM3020-.. Operating voltage AC 24 V ± 15 %, 50 / 60 Hz or DC 13.5...33 V 3-wire connection Power consumption < 0.5 VA Current draw < 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 QBM3120-.. 2-wire connection Output voltage DC 0 ...
PAGE 8
for QBM3x20-1U, -1, -1D − Zero point, end value − Sum from linearity, reproducible and hysteresis − TC zero point − TC sensitivity Long-term stability Response time Load change Tolerable overload on one side At P1 At P2 Rupture pressure 0…70 °C at room temperature Display (on QBM3020-…D only) Display of Degree of protection Connections Environmental conditions Standards, directives and approvals Environmental compatibility Dimensions (weight) <±1 % FS <±1 % FS < ± 0.1 % FS / °C < ± 0.
PAGE 9
Connection terminals QBM3020-xx G (+) M (0) U () Operating voltage AC 24 V or DC 13.5…33 V GND, measuring neutral Measuring signal DC 0...10 V G (+) I () Supply voltage DC 8...33 V Measuring signal DC 4...20 mA QBM3120-xx Dimensions 49 5,5 P2 P2 1916M01_01 9,6 16,3 80 86 46 18 P2 ø 6,2 46 P1 11 75 37 27,6 92 80 Dimensions in mm 9/10 Siemens Smart Infrastructure Differential pressure sensor QBM3020.. / QBM3120..
PAGE 10
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 2000 Delivery and technical specifications subject to change 10/10 Siemens Smart Infrastructure Differential pressure sensor QBM3020.. / QBM3120..