User Manual

ManualsBrandsSiemens ManualsSensors PressureDifferential_pressure_sensors QBM65…

916

QBM65-... QBM65.1-... QBM65.2-...

Differential Pressure

Sensors

QBM65...

for air and nonaggressive gases

• With choice of pressure-linear or extracting-the-root characteristic with

adjustable pressure measuring range

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

• Output signal DC 0...10 V

Use

For very demanding requirements with regard to accuracy and quality in the field of

ventilation, air conditioning and heating. To acquire the differential pressure of air or

nonaggressive gases.

Typical fields of application:

• Chemical industry (laboratories and production)

• In industrial environments (risk of contamination)

• In hospitals (e.g. in the operating theatre)

The differential pressure detectors are used:

• To measure over- or underpressure in air ducts in relation to the ambient pressure

• To measure pressure differentials between different rooms

• To acquire variable air volumes in VAV plants on the supply and extract air side

• To monitor filters and to control fans

• Especially on applications that demand:

− great accuracy

− very short response times (monitoring of fans)

− no susceptibility to contamination

CA1N1916E

27.08.2010

Building Technologies

Summary of content (8 pages)

PAGE 1
QBM65-... QBM65.1-... Differential Pressure Sensors 916 QBM65.2-... QBM65... for air and nonaggressive gases • With choice of pressure-linear or extracting-the-root characteristic with adjustable pressure measuring range • Operating voltage AC 24 V or DC 13.5…33 V • Output signal DC 0...10 V Use For very demanding requirements with regard to accuracy and quality in the field of ventilation, air conditioning and heating. To acquire the differential pressure of air or nonaggressive gases.
PAGE 2
Type summary Pressure-linear characteristic Type reference Without indication Measuring range Type reference Standard Limit value adjustable With indication − 50... + 50 Pa No --- QBM65-1 0... 100 Pa No QBM65.1-1 QBM65-3 0... 300 Pa No QBM65.1-3 QBM65-5 0... 500 Pa No QBM65.1-5 QBM65-10 0...1,000 Pa No QBM65.1-10 1) QBM65-25 0...2,500 Pa No QBM65.
PAGE 3
Mode of operation The sensor acquires the differential pressure with the help of a silicon diaphragm. The deflection of the diaphragm is sensed and converted to an electric signal. With the extracting-the-root sensors, the potentiometer is used to match the pressure measuring range on an individual basis. Depending on the type of sensor, the sensor’s electronic circuit generates either a pressure-linear or extracting-the-root signal which is calibrated and temperaturecompensated.
PAGE 4
Mechanical design The differential pressure sensor is designed for wall and ceiling mounting. It consists of: • Sensor housing with mounting bracket, cable entry and removable snap-on cover with safety screw • Pressure casing with diaphragm and lever • Printed circuit board with connection terminals and – with the extracting-the-root sensor – with a potentiometer for adjusting the limit value • LCD with the QBM65.1...
PAGE 5
1916Z02 Caution + If the pressure connection nipples face upward or are at a lower level than the air duct probes, condensation can collect inside the unit, causing damage to the sensor. – When mounting on 35 x 7.5 top hat rails to DIN, mounting bracket AQB21.2 is required which is available as an accessory item. The sensor snaps on the bracket. For direct mounting on lagged ducts, the sensor can be fitted with an AQB2000 mounting bracket (see "Accessories").
PAGE 6
Technical data Electrical interface Functional data Power supply Safety extra low voltage (SELV, PELV) Supply voltage AC 24 V ± 15 %, 50 / 60 Hz or DC 13.5...33 V Power consumption < 0.5 VA Current consumption < 10 mA Output voltage DC 0 ...
PAGE 7
Protective data Connection Degree of protection IP 54 to IEC 60 529 Safety class III to EN 60 730 Fire class to Hinged cover Pressure casing, complete Tubing UL94 HB V-2 V-2 Connection terminals screw terminals for 3 × 1.5 mm2 Cable entry Environmental conditions Pg 11 cable gland Pressure connection plastic nozzle 6.2 mm dia. Perm. ambient temperature Operation 0...70 °C – 10... + 70 °C Storage / t ransport Perm. ambient humidity Directive and standards < 90 % r.h.
PAGE 8
Dimensions 105 QBM65… 49 5,5 P2 22 P2 9,6 16,3 80 92 86 75 58 37 27,6 1916M01 80 46 4 92 51 28 35,2 6 11,6 AQB21.2 18 P2 ø 6,2 46 P1 11 9 1910M03 97 EN 60 715-TH 35-7.5 69,5 61 AQB2000 20 10 15 5,5 40 1916M02 34 5,5 20 10 21 1,5 60 Dimensions in mm 8/8  2005-2010 Siemens Switzerland Ltd. Subject to change Siemens Building Technologies Differential pressure sensors QBM65... CA1N1916E 27.08.