The Belimo 01APS-10U is an adjustable differential pressure switch for monitoring overpressure, vacuum, and differential pressure in air and other non-combustible, non-aggressive gases. It is widely used in HVAC systems for filter dirty indication, fan proving, and airflow/duct pressure supervision where a dependable switching (dry-contact) output is required.

This model covers a switching range of 50…500 Pa with setpoint adjustment and automatic reset. The device is designed for HVAC installations and is supplied (standard version) with practical installation items such as 2 m PVC tube, plastic duct connectors, and screws

Applications

• Air filter monitoring (clean/dirty filter indication)
• Fan proving (confirm airflow / pressure rise)
• Duct static pressure supervision
• Air handling unit (AHU) safety interlocks
• General airflow/pressure switch duties in BMS/controls