ActronAir High Pressure Sensor SPKT00B6R0 "Hercules" (Carel) is the Carel-supplied high-pressure transducer for Hercules variable capacity commercial systems (PKV1400T, PKV2000T), providing a continuous 4-20mA pressure signal to the CM100 commercial outdoor control board for real-time condensing pressure monitoring and capacity management. Unlike a simple on/off pressure switch, this transducer provides analogue pressure data that the CM100 uses to modulate compressor capacity before reaching the trip point -- a failed sensor causes the CM100 to default to fixed-capacity operation and may generate a pressure sensor fault alarm. Isolate power and recover refrigerant before replacing any Hercules refrigeration circuit components.