Siemens QBM81-3 Differential Pressure Switch 08-1.2" H2O

Siemens QBM81-3 Differential Pressure Switch is a precise on measuring and controlling dead pressure in HVAC systems. This switch is designed for use in applications requiring accurate pressure monitoring in the water column range of 0.08 to 1.2". At just 0.51 pounds and protected by a polycarbonate shell, it’s tough enough to work in extremely cold conditions (-40 to +185°F). The QBM81-3 is normally used in clean room conditions, ventilation systems and air handling units for optimal airflow and pressure balance.It measures and when the setpoint is reached, it activates an electrical allows the HVAC system to make automatic changes or sound an alarm.