Siemens Symaro QBM3020-25 Differential Pressure Sensor | 0–2500 Pa HVAC Air Sensor

Achieve high-accuracy environmental metrics across your building management systems with the premium Siemens QBM3020-25 Air Differential Pressure Sensor (Order No. S55720-S238). Part of the trusted Symaro family, this high-end industrial sensor is engineered explicitly for HVAC ventilation grids, cleanrooms, medical labs, and air duct systems to measure differential, over-, and under-pressure of air or non-aggressive gases.

The instrument relies on a highly responsive, piezo-resistive silicone membrane and ceramic bar sensing diaphragm mechanism to capture minute pressure shifts with an ultra-fast response time of less than 20 ms. The onboard intelligence supports a dual-profile switchable selection via an internal DIP switch, enabling engineers to swap between a standard pressure-linear output or an extracting-the-root characteristic curve for high-demand volumetric flow calculations. Housed inside a durable, transparent polycarbonate enclosure rated to IP54 standards for dust and splash deflection, it features a threaded cable gland port on the left for safe signal deployment, a dedicated lower differential pressure connection branch (6.2 mm diameter), and wide side keyway lugs for fast panel integration.

Product Details

• Brand: Siemens Building Technologies

• Model Number: QBM3020-25

• Stock Number: S55720-S238

• Product Series: Symaro Sensors

• Device Type: Air Duct Differential Pressure Sensor

• Pressure Measuring Range: 0 to 2500 Pa (Pascal)

• Operating Voltage: 24 VAC ($\pm$15%, 50/60 Hz) or 13.5 to 33 VDC

• Analog Output Signal: 0–10 VDC (3-wire connection, short-circuit proof)

• Response Time Parameter: < 20 ms

• Maximum Permissible Overpressure: 0.1 bar

• Ingress Protection Class: IP54 Rated