The **PTPH-4GA-R/CE** is a specialized high-pressure transducer/sensor, commonly utilized in industrial automation, HVAC/R systems, and hydraulic monitoring. This model is known for its "Ratiometric" output and "CE" certification for European safety standards. --- ### 1. Key Technical Specifications The following table highlights the core electronic and mechanical parameters: | Feature | Specification | | :--- | :--- | | **Sensor Type** | Piezoresistive / Pressure Transducer | | **Pressure Range** | Typically 0 to 4.2 MPa (42 Bar / ~600 PSI) | | **Input Voltage** | 5.0 VDC (±0.25V) | | **Output Signal** | Ratiometric (0.5V to 4.5V DC) | | **Accuracy** | ±1% to ±2% FS (Full Scale) | | **Thread Type** | 7/16-20UNF (Standard Refrigeration Flare) | | **Certification** | CE (Conformité Européenne) / RoHS | --- ### 2. Electronic Components & Functionality The "brain" of the PTPH-4GA-R/CE consists of three primary internal stages: 1. **Sensing Element (MEMS):** A silicon-based micro-machined diaphragm with piezoresistive strain gauges. When pressure is applied, the diaphragm deforms, changing the electrical resistance of the bridge circuit. 2. **Signal Conditioning ASIC:** An Application-Specific Integrated Circuit (ASIC) that compensates for temperature fluctuations and linearizes the raw millivolt signal from the sensor element. 3. **Ratiometric Output Circuit:** The "R" in the part number denotes **Ratiometric**. This means the output voltage is proportional to the supply voltage. If the 5V supply fluctuates slightly, the output scales accordingly, allowing the Controller/PLC to maintain accuracy by comparing the signal to the supply reference. --- ### 3. Wiring and Pinout Most versions of this sensor use a 3-pin Packard or similar automotive-grade connector. ```text Pin 1: Ground (GND / 0V) Pin 2: Supply Voltage (Vcc / +5V) Pin 3: Output Signal (Vout / 0.5 - 4.5V) ``` --- ### 4. Application Use Cases * **Refrigeration Units:** Monitoring discharge/suction pressure in high-capacity chillers. * **Hydraulics:** Real-time feedback for hydraulic fluid pressure in mobile machinery. * **Air Conditioning:** Used in VRF/VRV systems to manage compressor speeds via a PLC or PCB.