Siemens QBM65-3 Differential Air Pressure Sensor

Siemens QBM65-3 Differential Air Pressure Sensor

Product Description The Siemens QBM65-3 differential (overpressure) sensor is designed for high-precision measurement of pressure differences in air and non-aggressive gases within ventilation, air conditioning, and heating (HVAC) systems. Operating via a sensitive membrane, the device converts physical pressure displacement into a linear analog control signal. This sensor is ideal for buildings with strict requirements for air quality and climate control accuracy. It comes in a durable protective housing featuring an integrated cable gland.

Specifications

• Model: QBM65-3 (HVAC Products)

• Manufacturer: Siemens Building Technologies AG (Assembled in Switzerland)

• Pressure Measurement Range: 0 to +300 Pa (0...300 Pa)

• Maximum Allowable Pressure (Overload): up to 5000 Pa (pmax.: 5000Pa)

• Supply Voltage: SELV 24 V AC (±15%) or 13.5 to 33 V DC

• Output Signal: Analog, 0...10 V DC (0...10VDC), linear characteristic

• Enclosure Protection Rating: IP54

• Maximum Ambient Operating Temperature: T70 (up to +70°C)

• Wiring Layout / Terminal Marking: G (+ IN / Power), U (Signal OUT), M (GND / Common)

• Certifications: CE, N474, conforms to UL std. 3101-1, certified to CSA C22.2 no. 1010.1

Application

• Monitoring and controlling differential air pressure in ventilation ducts.

• Monitoring air filter clogging status in air handling units (AHUs).

• Measuring static and dynamic pressure for controlling fans and air dampers.

• Draft control in smoke extraction and air conditioning systems.

• Use in commercial and industrial building automation systems (smart buildings, climate control).