The **FUD-D6-R.SLASHQ** is a specific model within the **FUD Series** of high-performance flow sensors (typically manufactured by companies like **Azbil**). These devices are designed for micro-flow rate measurement, often used in the semiconductor and chemical industries. Below is a breakdown of its electronic components and technical specifications. --- ## 1. Core Technical Specifications The "SLASHQ" designation usually refers to a specific calibration or interface variant within the FUD series. | Feature | Specification | | :--- | :--- | | **Sensor Type** | Thermal Mass Flow Sensor | | **Fluid Compatibility** | Pure water, chemicals, and liquids | | **Output Signal** | 4–20 mA DC (Analog) or Pulse Output | | **Power Supply** | 12 to 24 V DC | | **Connection Type** | M12 Connector or Lead Wire (model dependent) | | **Measurement Range** | Typically 0 to 500 mL/min (varies by sub-model) | --- ## 2. Electronic Component Breakdown ### A. Sensing Element (MEMS Calorimetric Sensor) The heart of the device is a **MEMS (Micro-Electro-Mechanical Systems)** chip. * **Heater:** A tiny resistor that heats the flowing fluid. * **Temperature Sensors:** Two thermopiles located upstream and downstream of the heater. * **Principle:** As fluid flows, it carries heat from the upstream sensor to the downstream sensor. The temperature difference ($\Delta T$) is electronically converted into a flow rate. ### B. Signal Processing Circuitry * **ADC (Analog-to-Digital Converter):** Converts the raw voltage from the thermopiles into digital data. * **Microprocessor:** Applies linearization algorithms and temperature compensation to ensure accuracy across different liquid temperatures. * **Amplifier:** Scales the low-level sensor signals to the standard 4-20mA output range. ### C. Interface and Protection * **Reverse Polarity Protection:** Prevents damage if the DC power wires are connected backwards. * **Noise Filtering:** Integrated capacitors and inductors to reduce Electromagnetic Interference (EMI) in industrial environments. * **Diagnostic LED:** Often includes a small LED indicator to signal power status or error states (flow over-range or sensor failure). --- ## 3. Wiring Configuration The electronic interface generally follows a standard industrial pinout for flow meters: | Pin/Wire Color | Function | Description | | :--- | :--- | :--- | | **Brown** | +V | Power Supply (12-24V DC) | | **Blue** | 0V | Ground / Common | | **White** | Output | Analog 4-20mA or Pulse signal | | **Black** | Control/Alarm | Optional digital output for threshold alerts | --- ### Important Maintenance Note Because the electronic parts are integrated into a compact, often PFA-coated (fluoropolymer) housing, they are **non-serviceable**. If the internal MEMS bridge fails due to electrical surge or chemical ingress, the entire unit usually requires replacement. ---