The **PCC420VR-25MM-R6** is a high-performance industrial vibration sensor manufactured by Wilcoxon Sensing Technologies. It belongs to the **PCC420 series**, which are 4-20 mA velocity sensors designed for permanent mount monitoring on rotating machinery. --- ### 1. Core Technical Specifications The following table outlines the primary electronic and physical characteristics of this specific model: | Parameter | Specification | | :--- | :--- | | **Output Type** | 4-20 mA (Current Loop) | | **Measurement Type** | RMS Velocity | | **Full Scale Range** | 0 to 25 mm/s (Metric) | | **Connector Type** | R6 (2-pin MIL-C-5015) | | **Frequency Response** | 10 Hz to 1,000 Hz (±10%) | | **Power Requirement** | 12 - 30 VDC | | **Mounting Thread** | 1/4-28 tapped hole | --- ### 2. Key Electronic Components & Operation The sensor functions as an integrated unit that converts mechanical vibration into a standard industrial electrical signal. * **Piezoelectric Element:** The heart of the device is a PZT (Lead Zirconate Titanate) ceramic crystal. When mechanical stress (vibration) is applied, it generates a proportional charge. * **Internal Integrator:** Since the raw output of a piezo crystal is acceleration, the sensor contains internal circuitry that performs a mathematical integration to convert the signal to **Velocity (mm/s)**. * **RMS Conversion:** The electronics include a Root Mean Square (RMS) converter. This averages the vibration intensity to provide a steady DC current output suitable for PLC/DCS input. * **Loop-Powered 4-20 mA Transmitter:** The sensor acts as a current regulator. * **4 mA** represents 0 mm/s (no vibration). * **20 mA** represents 25 mm/s (full scale). --- ### 3. Connection and Wiring The **R6 connector** indicates a standard 2-pin military-style threaded connector. The wiring typically follows this logic: ```markdown Pin A: Positive (+), 12-30 VDC Pin B: Negative (-), 4-20 mA Signal / Return ``` *Note: The loop is usually completed by connecting a load resistor at the PLC/DCS side to convert the current back into a voltage signal for processing.* --- ### 4. Applications The PCC420VR-25MM-R6 is primarily used for **Balance-of-Plant (BoP)** equipment, including: 1. **Industrial Fans and Blowers:** Monitoring for unbalance or bearing wear. 2. **Pumps:** Detecting cavitation or misalignment. 3. **Motors:** General health monitoring for predictive maintenance.