The **F2VS-J0-R** is a specific model within the **F2VS series** of Digital Flow Sensors manufactured by **Azbil** (formerly Yamatake). These devices are designed to measure the flow rate of clean gases (like air or nitrogen) using micro-thermal flow sensing technology. --- ## 1. Core Electronic Components & Architecture The device integrates several high-precision electronic subsystems to convert physical gas flow into a digital or analog signal. | Component | Function | | :--- | :--- | | **Micro-Flow Sensor Chip** | A MEMS (Micro-Electro-Mechanical System) thermal sensor that detects mass flow. | | **Signal Conditioner** | Amplifies the micro-volt signals from the thermal bridge to a usable voltage. | | **A/D Converter** | Converts the analog voltage from the sensor into a high-resolution digital value. | | **Microprocessor (MCU)** | Handles linearization, temperature compensation, and output logic. | | **Interface Circuitry** | Provides the NPN/PNP switch outputs and the 1-5V analog output. | --- ## 2. Technical Specifications (Electronic) The "J0-R" suffix typically denotes specific output configurations and flow ranges. Below are the standard electronic characteristics for this series: | Parameter | Specification | | :--- | :--- | | **Power Supply** | 12 to 24 VDC (±10%) | | **Current Consumption** | 50 mA or less | | **Control Output** | NPN or PNP open collector (Max 30V, 80mA) | | **Analog Output** | 1 to 5 VDC (Impedance approx. 1 kΩ) | | **Response Time** | ≤ 50 ms (Selectable filters available) | | **Display Type** | 3-digit, 7-segment LED (Red) | --- ## 3. Key Electronic Features ### Micro-Thermal Sensing (MEMS) Unlike mechanical flow meters, the F2VS-J0-R uses a **heat transfer principle**. A heater element is placed between two temperature sensors. As gas flows, it carries heat from the upstream sensor to the downstream sensor. The electronic circuit measures this temperature differential to calculate the flow rate. ### Temperature Compensation Gas density changes with temperature. The onboard electronics include a thermistor to monitor gas temperature and apply a correction algorithm in real-time, ensuring the reading remains accurate regardless of environmental fluctuations. ### Output Logic The device features dual output capabilities: * **Switch Output:** Used for "Pass/Fail" logic (e.g., verifying a vacuum pick-up or a leak). * **Analog Output:** Used for data logging or continuous monitoring via a PLC (Programmable Logic Controller). --- ## 4. Wiring Diagram (Conceptual) ```mermaid graph LR A[Brown: +V 12-24VDC] --- B[F2VS Unit] C[Blue: 0V/GND] --- B D[Black: Control Output] --- B E[White: Analog Output 1-5V] --- B ``` ---