1. Key Technical Specifications Working pressure: 0~2.0MPa (range can be adjusted) Precision: ±1.5%F.S. (linearity, hysteresis, repeatability) Total error band: ±3.0%F.S. (-30℃~+100℃) A high-precision version is also available Operating temperature: -30℃~+100℃ Storage temperature: -40℃~+120℃ Protection pressure: 4.0Mpa Burst pressure: 6.0Mpa Working medium: R22, R407C, R134A and other refrigerants Service life: five million full range cycles Vibration: 11g (20~2000Hz) Electrical interface: YAZAKI RK03FB Protection level: IP69K Shell material: 304 stainless steel Pressure connection: φ6*1.0 pipe connection Supply voltage: 5.0±0.25VDC Output voltage: 0.5~4.5VDC (adjustable in 5V range) Power supply current: 10mA(Max) Load impedance: 10KΩ (typical) Output response time: 3mS Overvoltage protection: 16VDC Reverse voltage: -14VDC Short circuit protection: Yes EMC (80MHz to 1000MHz) : 3V/m ESD: 15KV air contact 8KV terminal 2KV 2. Core Function Continuously monitor refrigerant pressure of high and low pressure circuits while the air conditioner is running. Over-high pressure protection: Automatically shut down the compressor to prevent pipeline crack and compressor burnout. Over-low pressure protection: Cut off compressor operation to avoid dry burning due to refrigerant leakage. Deliver pressure data to the controller to adjust fan speed, compressor frequency and electronic expansion valve opening for stable cooling output. Built-in self-diagnosis module identifies open circuits, short circuits and abnormal pressure values, sends out fault alarm signals and stores fault codes. 3. Working Principle This sensor adopts mature piezoresistive sensing technology: Refrigerant pressure pushes the corrosion-resistant metal sensitive diaphragm and creates tiny elastic deformation. Integrated strain resistors on the diaphragm generate linear resistance changes corresponding to pressure values. The Wheatstone bridge converts resistance fluctuations into standard analog voltage signals. Internal signal conditioning and temperature compensation circuits eliminate environmental interference and output stable signals to the equipment controller. 4. Application Scope Equipment Types Water-cooled chillers, air-cooled heat pumps, rooftop commercial air conditioners, data center precision air conditioners, supermarket and shopping mall refrigeration units. Application Scenarios Central air conditioning systems for office buildings, constant temperature cooling for factories, heat dissipation of data centers, cold storage equipment for catering and large public refrigeration facilities.