Johnson Controls P70GA-27 Industrial Temperature Sensor

The Johnson Controls P70GA-27 is an open-low pressure control switch designed to protect refrigeration and HVAC equipment by signaling or interrupting power when suction pressure falls below the setpoint. The M-BLK variant features a 1/4" FNPT mounting port for straightforward integration into standard refrigerant lines. Rated for an operating range that typically spans from 20 inHg to 100 psi, this device uses a straightforward open-low switch action to energize or de-energize the circuit as pressure drops. Part of the P70 family of controls, the P70GA-27 is commonly used to safeguard compressors and evaporators in commercial and industrial systems, where maintaining adequate low-side pressure is critical to prevent motor stall or damage. A closely related P70GA-27C variant is described as Temperature/Process Control, reflecting the family’s broader role in temperature and pressure protection across refrigeration and process cooling installations. Typical applications include evaporator protection in refrigeration systems and air-conditioning setups, where a reliable, durable control point helps prevent underpressure conditions from impacting performance.