The **PTPH-4GG-R/CE** is a specialized high-pressure pressure transducer manufactured by **Nachi-Fujikoshi** (typically used in hydraulic systems). It is designed to convert hydraulic pressure into an analog electrical signal for monitoring and control. ### Technical Specifications | Feature | Specification | | :--- | :--- | | **Type** | Pressure Transducer (Strain Gauge based) | | **Rated Pressure** | 35 MPa (approx. 5076 PSI) | | **Supply Voltage** | 10V DC to 28V DC (standard range) | | **Output Signal** | 1 to 5V DC (standard for CE series) | | **Connection Thread** | G1/4 (with O-ring seal) | | **Electrical Connection** | DIN 43650 Connector (4-pin) | | **Accuracy Class** | ±0.5% F.S. (Full Scale) | | **Compliance** | CE Marked (European Safety Standards) | --- ### Key Electronic Components & Operation The PTPH-4GG-R/CE operates through several internal electronic stages: #### 1. The Sensing Element (Strain Gauge) The "heart" of the device is a **Thin-film Strain Gauge** bonded to a stainless steel diaphragm. When hydraulic pressure is applied: * The diaphragm undergoes microscopic deformation. * The electrical resistance of the strain gauge changes proportionally to the mechanical stress. #### 2. Signal Conditioning Circuitry Because the raw change in resistance is very small (millivolts), internal electronics perform the following: * **Amplification:** Boosts the millivolt signal to a stable 1–5V range. * **Temperature Compensation:** Uses thermistors to ensure the reading remains accurate even as the hydraulic oil temperature fluctuates. * **Filtering:** Removes "noise" or electrical interference caused by nearby hydraulic pumps or motors. #### 3. Output Configuration The **"R/CE"** suffix indicates specific compliance and output characteristics: * **R:** Indicates a specific pressure range or connector orientation common in Nachi's "R" series valves. * **CE:** Confirms the unit is shielded against Electromagnetic Interference (EMI), making it safe for use in industrial environments with high electrical noise. --- ### Wiring Configuration (Typical DIN Connector) | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | Power (+) | Positive input (10-28V) | | **2** | Common (-) | Ground / 0V | | **3** | Output (+) | 1-5V Signal Output | | **4/Case** | Shield / PE | Earth Ground (Protective) | --- ### Application Note This part is commonly found integrated with **Nachi PZS** or **PVS** series piston pumps. It provides real-time feedback to a PLC (Programmable Logic Controller) to maintain constant pressure or to trigger safety shutdowns if pressure exceeds 35 MPa.