The part number **P51100AGP20MA000000** typically refers to a high-precision pressure transducer from the **SSI Technologies (MediaSensor)** P51 series. These sensors are designed to measure liquid or gas pressure in industrial, automotive, and commercial applications. ### Technical Specifications Breakdown The alphanumeric code provides specific details about the construction and electrical characteristics of the sensor: | Feature | Specification | Description | | :--- | :--- | :--- | | **Series** | P51 | MediaSensor™ pressure transmitter series. | | **Pressure Range** | 100 | Measured in PSI (0 to 100 PSI). | | **Pressure Type** | A | **Absolute**: Measured relative to a vacuum. | | **Output Type** | G | **4-20 mA**: Standard industrial current loop output. | | **Port Thread** | P | **1/4" - 18 NPT**: Standard pipe thread for mounting. | | **Electrical Connector** | 20 | **20-inch harness/wires**: Lead wire length or specific connector style. | | **Accuracy** | M | **±1.0%**: Total error band (typical for this class). | | **Calibration/Option** | 000 | Standard factory calibration. | --- ### Internal Electronic Components The "Electronic Parts" within this device consist of a **micro-machined (MEMS) piezoresistive silicon sensing element**. Here is how the internal circuitry functions: #### 1. The Piezoresistive Bridge The heart of the sensor is a Wheatstone bridge etched onto a silicon diaphragm. When pressure is applied, the diaphragm flexes, changing the resistance of the bridge. #### 2. ASIC (Application Specific Integrated Circuit) The low-level millivolt signal from the bridge is sent to an onboard ASIC which performs: * **Signal Amplification:** Boosting the weak signal. * **Temperature Compensation:** Correcting errors caused by thermal expansion/contraction. * **Digital-to-Analog Conversion:** Converting the processed signal into a stable current output. #### 3. Signal Conditioning (4-20 mA Loop) Since this model features a **"G" (4-20 mA)** output: * It operates as a **2-wire transmitter**. * The current consumption changes linearly based on the pressure. * It is highly resistant to electrical noise over long cable runs, making it ideal for industrial environments. --- ### Key Applications * **HVAC/R Systems:** Monitoring refrigerant pressures. * **Hydraulics/Pneumatics:** Real-time monitoring of fluid power. * **Process Control:** Chemical or food processing where accuracy is critical. * **Automotive:** Fuel or oil pressure sensing. ---