The **M2VF2-4W2-R/UL** is a high-precision, plug-in type signal conditioner (transducer) manufactured by **M-System** (now MG CO., LTD.). It is specifically designed to convert a variable frequency input (from sensors like flow meters or tachometers) into a standard DC output signal. --- ### ## Technical Specifications The model number breaks down into specific electronic characteristics: | Component Code | Description | Specifications | | :--- | :--- | :--- | | **M2VF2** | Base Model | Variable Frequency Transmitter | | **4W** | Input Type | Contact, Open Collector, or Voltage Pulse | | **2** | Output Type | 4 – 20 mA DC (Source) | | **R** | Power Input | 24V DC | | **UL** | Standard | UL/cUL Class I, Div 2 Approval | --- ### ### Key Electronic Components & Functionality #### 1. Input Section (Frequency Detection) The device is designed to interface with various pulse-emitting sensors. * **Trigger Levels:** It features adjustable threshold levels to detect pulses from different sources (dry contacts, NPN/PNP, or magnetic pickups). * **Pulse Width:** It can process pulses with a minimum width of 10 microseconds. #### 2. Signal Processing (F/V Conversion) At the heart of the M2VF2 is a **Frequency-to-Voltage (F/V) converter**. * **Linearization:** It ensures the output is proportional to the input frequency. * **Frequency Range:** The range is typically field-adjustable (within the specific factory-ordered range) using the "Zero" and "Span" potentiometers on the front panel. #### 3. Output Section (Current Loop) The device converts the processed signal into a **4-20mA DC** loop. * **Load Resistance:** It can drive a load up to 750 $\Omega$. * **Response Time:** Approximately 0.5 seconds (0 – 90%). #### 4. Isolation & Protection * **3-Way Isolation:** Provides electronic isolation between the **Input**, **Output**, and **Power** terminals (up to 2000V AC). This prevents ground loops and protects sensitive PLC/DCS inputs from electrical noise. * **UL/cUL Certification:** Built with components that meet safety standards for hazardous locations (Class I, Division 2). --- ### ### External Connections (Pin Layout) The unit uses a standard 8-pin socket base. | Pin No. | Function | Description | | :--- | :--- | :--- | | 1 | Output (+) | 4-20mA Positive | | 2 | Output (-) | 4-20mA Negative | | 3 | Input (+) | Frequency Pulse Input | | 4 | Input (-) | Common | | 7 | Power (+) | +24V DC | | 8 | Power (-) | 0V DC | ---