The **W2TS-NAA-R2** is a high-performance **Programmable Digital Temperature Transmitter** (specifically a head-mount type) manufactured by **M-System**. It is designed to convert signals from a temperature sensor (Thermocouple or RTD) into a standard 4-20mA DC output. Below is a detailed breakdown of its electronic specifications and components. --- ### 1. Core Technical Specifications | Feature | Specification | | :--- | :--- | | **Model Type** | W2TS Series (Head-mount Temperature Transmitter) | | **Input Type** | Universal (Thermocouple, RTD, DC mV, or Potentiometer) | | **Output Type** | 4 – 20 mA DC (2-wire system) | | **Power Input** | 12 – 45 V DC (Loop-powered) | | **Accuracy** | ±0.1% of span (depends on sensor type) | | **Communication** | PC programmable (via specialized cable) | --- ### 2. Key Electronic Functions The W2TS-NAA-R2 utilizes several integrated electronic circuits to ensure precise signal conditioning: * **A/D Converter (Analog-to-Digital):** Converts the micro-voltage from the sensor (e.g., K-type thermocouple) into a high-resolution digital signal for processing. * **Microprocessor Control:** Handles the linearization of the temperature curves. Since sensors like RTDs are not perfectly linear, the CPU applies mathematical corrections to ensure the output matches the actual temperature. * **Cold Junction Compensation (CJC):** For thermocouple inputs, the device contains a built-in sensor to measure the terminal temperature, compensating for the voltage generated at the connection point. * **Galvanic Isolation:** Provides electrical separation between the input and output (typically up to 1500V AC), protecting the control system from ground loops and electrical noise. --- ### 3. Wiring and Physical Interface The unit is designed to fit inside a standard **DIN form B connection head**. * **Terminals 1 & 2:** Sensor Input (RTD/Thermocouple). * **Terminals 3 & 4:** 4-20mA Loop output and Power supply input. * **Configuration Port:** A small jack/connector used to link the device to a PC via a "Communication Adaptor" (Model COP-US) for software-based range setting. --- ### 4. Safety and Protection Features * **Burnout Protection:** The electronic logic can be programmed to drive the output to "Upscale" (20mA+) or "Downscale" (4mA-) if the sensor wire breaks. * **Noise Filtering:** Includes digital filters to suppress 50/60 Hz electromagnetic interference commonly found in industrial environments. * **Reverse Polarity Protection:** Prevents damage to the internal circuitry if the 2-wire loop cables are connected backward. ---