The **W2TS-2BY-R2/CE** is a high-precision, industrial-grade temperature transmitter manufactured by **Watanabe Electric Industry**. It is designed to convert signals from a temperature sensor (specifically a Thermocouple) into a standard DC output signal. --- ## 1. Technical Specifications The following table summarizes the primary electronic characteristics of the unit: | Feature | Specification | | :--- | :--- | | **Input Type** | Thermocouple (specified at time of order) | | **Output Range** | R2: 4 to 20 mA DC | | **Power Supply** | CE: 100-240V AC (50/60 Hz) | | **Accuracy** | ±0.1% of span (typical) | | **Response Time** | 0.5 seconds or less (0 to 90%) | | **Isolation** | Input / Output / Power (2000V AC for 1 minute) | | **Mounting** | DIN Rail or wall mounting | --- ## 2. Model Breakdown (Nomenclature) Understanding the electronic capabilities requires breaking down the part number: - **W2TS**: The series designation (Slim 2-wire or 4-wire type signal conditioner). - **2BY**: Refers to the specific input configuration (Thermocouple input with a built-in cold junction compensation). - **R2**: Defines the output signal (4 to 20 mA DC current loop). - **CE**: Indicates the power supply voltage (100-240V AC) and compliance with European CE standards. --- ## 3. Electronic Components & Functionality ### Input Circuitry (Thermocouple) The input stage includes a high-impedance amplifier and a **Cold Junction Compensation (CJC)** circuit. This ensures that the transmitter accounts for the ambient temperature at the connection terminals, preventing measurement errors caused by the "cold" end of the thermocouple. ### Signal Processing The device utilizes a linearizer circuit to convert the non-linear voltage output of the thermocouple into a linear DC current. This ensures that the 4-20mA output is directly proportional to the temperature scale. ### Isolation and Protection - **Galvanic Isolation:** The device provides three-way isolation between the input, output, and power supply. This protects sensitive PLC/DCS inputs from ground loops and electrical noise common in industrial environments. - **Burnout Protection:** It features a burnout function (selectable high or low) which forces the output to a specific state (e.g., 20mA or 4mA) if the thermocouple wire breaks. --- ## 4. Wiring Diagram Representation The unit typically follows this terminal layout for electronic integration: ```text [ Power Supply ] [ Input ] [ Output ] (1) L (+) (4) + (TC) (7) + (4-20mA) (2) N (-) (5) - (TC) (8) - (4-20mA) (3) Ground (6) N.C. ``` ---