The **PS87-503P-H-R2** is a high-performance, integrated pressure switch/sensor manufactured by Nidec Components (formerly Copal Electronics). It is designed for high-vacuum and high-pressure industrial applications, specifically within the semiconductor and gas handling industries. --- ### 1. Key Technical Specifications | Parameter | Specification | |:---|:---| | **Pressure Range** | -0.1 to 5.0 MPa (Gauge Pressure) | | **Output Type** | 2 NPN Open Collector Transistor Outputs | | **Analog Output** | 1 to 5 V DC | | **Power Supply** | 12 to 24 V DC ±10% | | **Current Consumption** | ≤ 30 mA | | **Accuracy** | ±1.0% F.S. (Full Scale) | | **Operating Temp** | -10°C to 60°C | --- ### 2. Electronic Component Breakdown The device functions as a mechatronic system consisting of several internal stages: #### A. Sensing Element (Pressure Transducer) The heart of the unit is a **diffused-type silicon diaphragm**. This semiconductor-based sensor utilizes the piezoresistive effect: when pressure is applied, the electrical resistance of the silicon changes proportionally. #### B. Signal Conditioning Circuit * **Amplifier:** The raw millivolt signal from the diaphragm is amplified to a usable 1-5V analog range. * **Temperature Compensation:** Internal circuitry corrects for thermal drift to ensure accuracy remains stable across the -10°C to 60°C range. #### C. Switching Logic (NPN Outputs) The "P" in the part number indicates the switching functionality. * It features **two independent NPN open collector outputs**. * These act as electronic switches that pull the load to the ground (0V) when the set pressure threshold is reached. * **Hysteresis Mode:** This allows the user to set "on" and "off" points to prevent rapid flickering (chatter) near the setpoint. #### D. Connection Interface * **H:** Represents the specific electrical connection style (typically a specialized connector or lead wire configuration). * **R2:** Refers to the pressure port fitting (specifically a **1/4 VCR type** fitting), which is a standard in high-purity gas delivery systems. --- ### 3. Part Number Decoder Understanding the specific nomenclature helps in identifying electronic behavior: * **PS87:** Series name (Thin-film/Diffused pressure switches). * **503:** Pressure range code (503 = 5.0 MPa). * **P:** Denotes Gauge pressure measurement. * **H:** High-reliability/Specific lead wire type. * **R2:** Mechanical interface (1/4 VCR). --- ### 4. Typical Application Circuit To interface this with a PLC or Microcontroller, the following wiring logic is used: ```markdown [Power Supply (+)] ----> Red Wire (12-24V) [Load/PLC Input] ----> White/Black Wires (NPN Outputs) [Common Ground] ----> Blue Wire (0V) [Analog Input] ----> Green Wire (1-5V Signal) ```