The **PCC420VR-05-R6** is a specialized industrial sensor manufactured by Wilcoxon Sensing Technologies. It is a **Vibration Transmitter** designed to convert mechanical vibration into a standard industrial process control signal. --- ## 1. Core Technical Specifications The model number provides specific information about its output and range: | Feature | Specification | | :--- | :--- | | **Output Type** | 4-20 mA Loop Powered | | **Measurement Parameter** | Velocity (V) | | **Detection Type** | RMS (Root Mean Square) | | **Full Scale Range** | 0.5 inches per second (ips) | | **Termination** | R6 (Terminal block/Integral cable options depending on specific housing) | | **Frequency Response** | 10 Hz to 1,000 Hz | --- ## 2. Electronic Components & Internal Design The device functions as an integrated transducer, combining sensing elements with signal conditioning electronics. ### A. The Piezoelectric Sensing Element At its heart, the device uses a **Piezoceramic crystal**. When the machine vibrates, the crystal is subjected to stress, creating an electrical charge proportional to the acceleration of the vibration. ### B. Internal Signal Conditioning The sensor contains an internal circuit board that performs several electronic tasks: 1. **Integrator:** Since the raw crystal output is acceleration, the electronics perform a mathematical integration to convert the signal into **Velocity**. 2. **True RMS Converter:** The AC vibration signal is converted into a DC value representing the RMS energy level. 3. **Current Loop Driver:** A 4-20 mA driver regulates the current on the loop. 4 mA represents zero vibration (0.0 ips), and 20 mA represents the full scale (0.5 ips). ### C. Power Requirements * **Loop Powered:** It does not require a separate power supply. It draws power directly from the 4-20 mA loop (typically 12-30 VDC). * **Reverse Wiring Protection:** Includes diodes to prevent damage if the positive and negative leads are swapped. --- ## 3. Application and Connection This sensor is designed to interface directly with a **PLC (Programmable Logic Controller)**, **DCS**, or **SCADA** system without needing an external vibration monitor. ### Wiring Diagram Concept ```text [Power Supply (+)] ----> [Sensor Pin A] [Sensor Pin B] --------> [PLC Analog Input (+)] [PLC Analog Input (-)] -> [Power Supply (-)] ``` --- ## 4. Key Advantages * **No Specialist Knowledge Required:** Because it outputs 4-20 mA, plant electricians can treat it like a temperature or pressure transmitter. * **Noise Immunity:** Current signals (4-20 mA) are much less susceptible to electromagnetic interference over long cable runs than raw voltage signals. * **Continuous Monitoring:** Provides 24/7 data for trend analysis and early warning of bearing failure or imbalance.