The **M2UDS-J5-R2** is a specific model within the **M2 Series** of ultra-compact, plug-in signal conditioners manufactured by **M-System** (now part of MG CO., LTD). This particular unit is an **RTD Transmitter**. Its primary function is to accept a signal from a Resistance Temperature Detector (RTD) and convert it into a standardized isolated DC voltage or current signal. --- ### 1. Model Code Breakdown The alphanumeric suffix defines the specific hardware configuration of the unit: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **M2UDS** | Model Series | Ultra-slim Signal Conditioner (RTD Input) | | **J5** | Input Type | Pt 100 (ITS-90) RTD input | | **R** | Power Input | 24V DC power supply | | **2** | Output Type | 4 – 20 mA DC (Current Loop) | --- ### 2. Key Electronic Specifications The internal electronics are designed for industrial precision and noise rejection. * **Input (RTD):** Designed for 3-wire Pt 100 sensors. It applies a small excitation current to measure resistance changes without self-heating the sensor. * **Burnout Protection:** The device includes circuitry to detect a broken wire in the RTD. It can be configured to drive the output "Upscale" (max mA) or "Downscale" (min mA) upon sensor failure. * **Isolation:** Features **3-way isolation**. This means the Input, Output, and Power circuits are electrically separated (usually up to 2000V AC). This prevents ground loops and protects sensitive PLC/DCS inputs. * **Accuracy:** Typically ±0.1% of span, ensuring high-fidelity data transmission in process control. --- ### 3. Physical & Connection Interface The "M2" series is known for its "Plug-in" base construction, allowing the electronics to be replaced without disturbing the permanent wiring. * **Housing:** Slim-line profile (29mm width) for DIN-rail mounting. * **Terminal Block:** M3.5 screw terminals located on the base socket. * **Adjustments:** Front-facing Zero and Span adjustments (trimmer potentiometers) for field calibration. --- ### 4. Application Circuit Example Below is a simplified representation of how the M2UDS-J5-R2 is integrated into a system: ```text [ RTD Sensor ] ----> [ M2UDS-J5-R2 ] ----> [ PLC / Controller ] (Temp Input) (Signal Isolator) (4-20mA Analog In) ^ | [ 24V DC Power ] ``` --- ### Summary Table | Feature | Specification | | :--- | :--- | | **Input Sensor** | Pt 100 (3-wire) | | **Output Signal** | 4 to 20 mA DC | | **Supply Voltage** | 24V DC (±10%) | | **Response Time** | ≤ 0.5 seconds (0 – 90%) | | **Mounting** | DIN Rail (via socket) |