The **M2VF-BFW-R2/UL** is a high-performance, plug-in type **Signal Conditioner (Transducer)** manufactured by **M-System**. Its primary electronic function is to accept a variable frequency pulse signal and convert it into a proportional DC voltage or current output. --- ### 1. Key Technical Specifications The model code "BFW" specifies the input/output configuration and power requirements. | Component / Feature | Description | | :--- | :--- | | **Input Signal (B)** | Variable frequency (Dry contact, Open collector, or Voltage pulse) | | **Output Signal (FW)** | Dual output (e.g., 4–20mA DC and 1–5V DC, depending on internal settings) | | **Power Supply (R2)** | 110V AC (Standard range: 85 – 132V AC, 47 – 66Hz) | | **Approval (UL)** | UL / cUL Class I, Division 2 certified | | **Response Time** | Approx. 2 seconds (0 to 90%) | | **Isolation** | 4-way isolation (Input to Output 1 to Output 2 to Power) | --- ### 2. Internal Electronic Operation The M2VF series utilizes a **Frequency-to-DC conversion** circuit architecture. Here is how the electronic parts process the signal: 1. **Input Pulse Shaping:** The input stage receives raw pulses. It features a noise filter and a trigger circuit that detects the frequency regardless of the waveform (square, sine, or triangular), provided it crosses the threshold. 2. **Frequency Calculation:** The internal circuitry calculates the frequency based on the time interval between pulses. 3. **Isolation Barrier:** The signal is passed through an optical or magnetic isolator to ensure that high-voltage surges on the field side do not damage the PLC or DCS connected to the output. 4. **D/A Conversion & Amplification:** The processed frequency data is converted into an analog signal and amplified to the standard 4-20mA or 0-10V range. 5. **Output Regulation:** The "Dual Output" feature allows two independent signals to be sent to different devices (e.g., a local display and a remote controller) simultaneously. --- ### 3. Wiring and Terminal Layout The unit uses a M3 screw terminal base. Below is a general representation of the electronic connections: | Terminal No. | Function | Description | | :--- | :--- | :--- | | **1 & 2** | Output 1 | Primary Analog Output (+) / (-) | | **3 & 4** | Output 2 | Secondary Analog Output (+) / (-) | | **5 & 6** | Input | Frequency Pulse Input | | **7 & 8** | Power Supply | 110V AC Input | --- ### 4. Application Use Case This specific electronic part is commonly used in: * **Flow Measurement:** Converting pulses from a turbine flowmeter into a 4-20mA flow rate signal. * **Motor Speed Monitoring:** Converting pulses from a proximity switch or encoder on a rotating shaft into a speed reference signal. * **Power Grid Monitoring:** Measuring frequency fluctuations in power lines.