The **F2VS-B2-R/Q** is a specific model within the **F2VS Series** of electronic flow sensors, typically manufactured by companies like **Azbil** (formerly Yamatake). These devices are designed for measuring and monitoring the flow rate of gases, often used in semiconductor manufacturing and industrial automation. Below is the breakdown of its electronic components, specifications, and features. --- ### 1. Key Technical Specifications The model suffix codes (B2-R/Q) define the specific electronic output and interface configuration. | Feature | Specification | | :--- | :--- | | **Sensor Type** | Thermal Mass Flow Sensor | | **Flow Direction** | Uni-directional (Standard) | | **Power Supply** | 12 to 24 V DC | | **Output Signal** | 1–5V DC (Analog) or 4–20mA (Current) | | **Control Interface** | NPN or PNP Open Collector (model dependent) | | **Response Time** | Fast (typically < 50ms to 100ms) | --- ### 2. Core Electronic Components The internal architecture of the F2VS series consists of several critical electronic subsystems: #### A. Thermal Flow Sensing Element The heart of the device is a **MEMS (Micro-Electro-Mechanical Systems)** thermal sensor. * **Heating Element:** A micro-resistor that heats up. * **Temperature Sensors:** Located upstream and downstream of the heater. As gas flows, it carries heat from the upstream sensor to the downstream sensor. The temperature difference is electronically converted into a mass flow measurement. #### B. Signal Processing Circuitry (ASIC) The raw data from the MEMS sensor is processed by an onboard Integrated Circuit: * **Linearization:** The raw thermal signal is non-linear; the electronics use a lookup table or algorithm to provide a linear output. * **Temperature Compensation:** Corrects for fluctuations in the ambient gas temperature to ensure accuracy. #### C. Output Drive Stage * **D/A Converter:** Converts digital processing data back into an analog voltage (1-5V) or current (4-20mA). * **Switching Transistors:** Provides discrete "Event" or "Alarm" outputs when flow hits a specific setpoint. --- ### 3. Model Suffix Breakdown (B2-R/Q) The letters at the end of the model number specify the electrical interface: * **B2:** Refers to the flow range and body size (specific to the gas type, often Air or Nitrogen). * **R:** Usually indicates the type of output connector or specific wiring pinout (often a circular connector). * **Q:** Often denotes a "Quick-Connect" feature or a specific logic for the digital outputs (e.g., NPN/PNP configuration). --- ### 4. Wiring and Connection The device typically utilizes a multi-core cable or a M8/M12 style connector. | Wire Color (Standard) | Function | Description | | :--- | :--- | :--- | | **Brown** | V+ | Power Supply (12-24V DC) | | **Blue** | 0V | Power Ground / Common | | **Black** | OUT 1 | Control Output (Switching) | | **White** | Analog OUT | 1-5V or 4-20mA Flow Signal | --- ### 5. Application Usage Because of its high-speed electronic response and high sensitivity, this part is used in: 1. **Suction Verification:** Checking if a vacuum component has successfully "picked up" a part in SMT lines. 2. **Leak Testing:** Detecting minute drops in pressure/flow in sealed electronic housings. 3. **Nitrogen Purging:** Monitoring the flow of inert gas into sensitive electronic storage. ---