The **M2VF2-B3-R/UL** is a high-precision, plug-in type **Signal Conditioner (Transducer)** manufactured by **M-System**. Its primary function is to convert a variable frequency input signal into a standard analog DC output. Below is a detailed breakdown of its electronic specifications and characteristics. --- ### 1. Model Code Breakdown The model name follows a specific nomenclature that defines its hardware capabilities: | Code Segment | Meaning | Specification | |:---|:---|:---| | **M2VF2** | Model Series | Frequency Transmitter (Signal Conditioner) | | **B** | Power Input | 100V – 120V AC | | **3** | Input Type | Open Collector, Voltage Pulse, or Dry Contact | | **R** | Output Type | 4 – 20 mA DC | | **UL** | Certification | UL/cUL recognized component | --- ### 2. Key Electronic Specifications The internal electronics are designed for industrial-grade isolation and signal processing. #### A. Input Parameters (Pulse Input) The device accepts various pulse signals to determine frequency: * **Input Frequency Range:** 0 – 10 Hz minimum, 0 – 10 kHz maximum. * **Input Types:** * *Voltage Pulse:* High level 2 – 50V, Low level < 1V. * *Open Collector:* 12V / 7mA detection circuit. * **Pulse Width:** Must be at least 10 microseconds. #### B. Output Parameters (DC Current) * **Standard Output:** 4 – 20 mA DC. * **Load Resistance:** Up to 750 $\Omega$. * **Response Time:** Typically $\leq$ 0.5 seconds (0 – 90%). #### C. General Performance * **Accuracy:** $\pm$0.1% of span. * **Isolation:** 2000V AC @ 1 minute (Input to Output to Power to Ground). * **Power Consumption:** Approx. 3 VA. --- ### 3. Circuit Block Diagram Components Internally, the M2VF2-B3-R/UL consists of several critical electronic stages: 1. **Pulse Shaper:** Cleans the incoming raw pulse/frequency signal to eliminate bounce or noise. 2. **Frequency-to-Voltage (F/V) Converter:** The core processor that converts the pulse rate into a proportional voltage level. 3. **Isolation Transformer/Optoisolator:** Ensures that high-voltage transients on the input or power side do not damage the output control system (PLC/DCS). 4. **Output Amplifier:** Converts the internal voltage signal into a stable 4-20mA current loop. --- ### 4. Installation and Wiring The device utilizes a **M3.5 screw terminal** base. Because this is a "Plug-in" model, the electronics are housed in a removable module, allowing for easy replacement without disconnecting the field wiring. ```text Terminal Pin Assignment (Typical): 1. Output (+) 2. Output (-) 3. Input (+) 4. Input (-) 5. Power (L) 6. Power (N) ```