The **W2VS-AAA-R/N** belongs to the W2 series of signal conditioners/transducers, typically manufactured by **M-System**. These devices are designed to take a variable resistance input (like a potentiometer) and convert it into two isolated DC output signals. --- ### 1. Part Number Breakdown Understanding the specific configuration based on the alphanumeric code: | Code Segment | Meaning | Specification | | :--- | :--- | :--- | | **W2VS** | Series Name | Potentiometer Transmitter (Dual Output) | | **AAA** | Input/Output 1/Output 2 | **A**: 4–20 mA DC (Input/Output combinations) | | **R** | Power Input | 24V DC | | **N** | Standards/Approvals | No special approvals (Standard) | --- ### 2. Key Electronic Specifications This component acts as a high-precision bridge between mechanical position (resistance) and industrial control systems (current loops). * **Input Type:** Potentiometer (Total resistance 100 $\Omega$ to 10 k$\Omega$). * **Output 1 & 2:** 4 – 20 mA DC (Load resistance max. 350 $\Omega$). * **Isolation:** 4-way isolation (Input to Output 1 to Output 2 to Power). * **Accuracy:** $\pm$0.1% of span. * **Response Time:** $\leq$ 0.5 seconds (0 – 90%). * **Power Consumption:** Approx. 3W. --- ### 3. Internal Block Diagram Logic The device operates through four primary electronic stages: 1. **Input Conditioning:** Provides a constant voltage to the potentiometer and senses the wiper position. 2. **Isolation (Optical/Magnetic):** Converts the signal into a pulse or light frequency to jump an isolation barrier, protecting the PLC/DCS from surges. 3. **Signal Conversion:** Translates the isolated signal into a linear 4-20mA current. 4. **Dual Output Driver:** Splits the signal into two independent channels, allowing one to go to a local display and the other to a remote controller. --- ### 4. Terminal Connections | Terminal | Function | Description | | :--- | :--- | :--- | | **1 / 2 / 3** | Input | Potentiometer (CW / Wiper / CCW) | | **4 / 5** | Output 1 | 4–20mA (+) and (-) | | **6 / 7** | Output 2 | 4–20mA (+) and (-) | | **8 / 9** | Power | 24V DC (+) and (-) | --- ### 5. Common Applications * **Valve Position Sensing:** Converting the mechanical turn of a valve into a signal for a control room. * **Tank Level:** Using a float-type potentiometer to measure liquid height. * **Redundancy:** Providing two identical signals to two different safety systems simultaneously.