1. Key Technical Specifications Working pressure: 0~4.6MPa (range can be adjusted) Precision: ±1.5%F.S. (linearity, hysteresis, repeatability) Total error band: ±3.0%F.S. (-30℃~+120℃) A high-precision version is also available Operating temperature: -40℃~+120℃ Storage temperature: -40℃~+120℃ Protection pressure: 6.9Mpa Burst pressure: 9.2Mpa 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: C3602 copper Pressure connection: 7/16-20UNF-2B 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 Real-time monitor refrigerant pressure in high and low pressure loops during unit operation. High-pressure protection: Cut off the compressor to prevent pipeline rupture and compressor burnout under excessive pressure. Low-pressure protection: Stop compressor operation to avoid dry burning caused by refrigerant leakage. Feed pressure signals to controller to adjust fan speed, compressor frequency and opening of electronic expansion valve for stable cooling effect. Built-in self-diagnosis function detects circuit open circuit, short circuit and abnormal pressure, outputs fault alarm signals and stores fault codes. 3. Working Principle The sensor adopts mature piezoresistive sensing technology: Refrigerant pressure acts on anti-corrosion metal sensitive diaphragm and generates tiny elastic deformation. Integrated strain resistors on the diaphragm produce linear resistance changes corresponding to pressure values. Wheatstone bridge converts resistance variation into stable analog voltage signals. Internal signal conditioning and temperature compensation circuits eliminate environmental interference and output reliable signals to the unit controller. 4. Application Scope Equipment Types Water-cooled chillers, air-cooled heat pumps, rooftop commercial air conditioners, precision air conditioners for data rooms, refrigeration units for shopping malls and supermarkets. Application Scenarios Office building central air conditioning, factory constant temperature cooling, data center heat dissipation, commercial catering cold storage systems, large public venue refrigeration equipment.