Based on your query, the **FTS-N2-R/BN** appears to be a specific model variant of a **Thermal Flow Sensor** (likely from the FTS series by manufacturers like *GEMS Sensors* or similar industrial automation brands). These devices are used to monitor the flow rate and temperature of liquids. Below is the breakdown of its electronic components, specifications, and wiring structure. --- ### 1. Functional Overview The FTS-N2-R/BN is an electronic flow switch that operates on the **calorimetric principle**. It uses two thermistors (sensors) inside the probe: one is heated, and the other measures the fluid temperature. The cooling effect of the flowing fluid is used to determine the flow rate. ### 2. Technical Specifications | Feature | Specification Details | | :--- | :--- | | **Operating Principle** | Calorimetric (Thermal) | | **Switching Output** | Relay (indicated by the **-R** in the model code) | | **Housing Material** | Nickel-plated brass (indicated by **BN**) | | **Connection Type** | Typically M12 Circular Connector or Hardwired Cable | | **Media Compatibility** | Water and water-based liquids | | **Pressure Rating** | Usually up to 100 bar (verify with datasheet) | --- ### 3. Key Electronic Parts The internal circuitry consists of several critical stages: 1. **Sensing Element:** A pair of matched NTC or PTC thermistors housed in the metal tip. 2. **Signal Processing (ASIC):** An internal integrated circuit that compares the temperature differential between the sensors and converts it into a standardized signal. 3. **Adjustment Potentiometers:** Most units feature "Teach-In" buttons or screw-potentiometers to set the setpoint (the flow rate at which the switch triggers). 4. **Output Relay:** A physical or solid-state relay that opens or closes a circuit when the flow drops below or rises above the setpoint. 5. **LED Indicators:** * **Red:** Flow below setpoint (Switch off). * **Yellow/Amber:** Flow at setpoint. * **Green:** Flow exceeds setpoint. --- ### 4. Wiring and Pinout Since this model features a **Relay (-R)** output, the wiring typically follows this logic: | Pin/Wire Color | Function | Description | | :--- | :--- | :--- | | **Brown** | +VDC | Power Supply (typically 24V DC) | | **Blue** | 0V / GND | Ground | | **White** | Relay COM | Common contact for the switch | | **Black** | Relay NO/NC | Normally Open or Normally Closed contact | --- ### 5. Application Usage * **Pump Protection:** Ensuring a pump does not run dry. * **Cooling Systems:** Monitoring the flow of coolant in welding machines or induction furnaces. * **Lubrication Monitoring:** Confirming oil or lubricant flow in heavy machinery.