The **W2TS-1AB-R2/CE** is a high-precision digital temperature transmitter, typically manufactured by **Waton** or associated industrial sensor specialists. It is designed to convert signals from temperature sensors into standardized electrical outputs for industrial automation. --- ### 1. Technical Specifications The following table outlines the core electronic and mechanical parameters of the device: | Feature | Specification | | :--- | :--- | | **Input Type** | Thermocouple (Standard K, J, T, E, etc.) or RTD (Pt100) | | **Output Signal** | 4-20mA DC (Two-wire system) | | **Power Supply** | 12V to 35V DC | | **Accuracy Class** | ±0.2% FS or ±0.5% FS (Model dependent) | | **Mounting** | DIN Rail Mounting (TS-35) | | **Operating Temp** | -20°C to +70°C | | **Galvanic Isolation** | Integrated (Input/Output isolation) | --- ### 2. Key Electronic Components & Features #### A. Signal Conditioning Circuitry The device contains an internal **Analog-to-Digital Converter (ADC)** that digitizes the weak millivolt (mV) signals from thermocouples or the resistance changes from RTDs. It applies a linearization algorithm to ensure the output current is proportional to the temperature. #### B. 4-20mA Current Loop The "R2" designation often refers to the two-wire configuration. The transmitter acts as a variable resistor, modulating the current drawn from the power supply between 4mA (minimum temperature) and 20mA (maximum temperature). #### C. Cold Junction Compensation (CJC) If used with thermocouples, the unit includes an internal thermistor to measure the temperature at the terminal block. This allows the electronics to subtract the ambient temperature error inherent in thermocouple circuits. #### D. Isolation and Protection * **CE Marking:** Indicates compliance with European electromagnetic compatibility (EMC) standards. * **Surge Protection:** Includes TVS diodes to protect internal circuits from voltage spikes on the signal line. --- ### 3. Wiring Configuration The unit typically follows a standard industrial pinout for DIN-rail transmitters: ```text Power Supply (+) ---- [ Terminal 1 ] [ Terminal 2 ] ---- Load/PLC Input (+) Load/PLC Input (-) ---- Power Supply (-) Sensor (+) ---------- [ Terminal 3 ] Sensor (-) ---------- [ Terminal 4 ] ``` --- ### 4. Application Areas * **PLC/DCS Integration:** Converts raw sensor data into a format readable by industrial controllers. * **Long-Distance Transmission:** 4-20mA signals are highly resistant to electrical noise over long cable runs. * **HVAC & Food Processing:** Used where precise temperature monitoring is required for regulatory compliance.