The **M2RTS-R-DA-M2** belongs to the M2-Series of signal conditioners/transmitters, typically manufactured by companies like **M-System**. This specific model is a **Potentiometer Transmitter**, designed to convert resistance changes from a potentiometer into a standard analog signal. --- ### 1. Model Breakdown The alphanumeric code identifies the specific electronic configuration of the unit: | Segment | Identification | Description | | :--- | :--- | :--- | | **M2RTS** | Model Series | Potentiometer Transmitter (Plug-in base) | | **R** | Input Type | Potentiometer (Total resistance 100 $\Omega$ to 10 k$\Omega$) | | **DA** | Output Type | 4 – 20 mA DC (Current Loop) | | **M2** | Power Supply | 100 – 240 V AC (Universal AC supply) | --- ### 2. Key Electronic Specifications The internal circuitry is designed for high precision and industrial-grade isolation. * **Input Circuit:** * **Excitation Voltage:** Approx. 0.5 V DC. * **Allowable Resistance:** Total resistance must be within 100 $\Omega$ to 10 k$\Omega$. * **Output Circuit:** * **Load Resistance:** Maximum 750 $\Omega$. * **Type:** Active 4-20mA current source. * **Isolation Architecture:** * **3-Port Isolation:** Input, Output, and Power are all galvanically isolated from each other. * **Isolation Resistance:** $\ge$ 100 M$\Omega$ at 500 V DC. * **Performance:** * **Accuracy:** $\pm 0.1\%$ of span. * **Response Time:** $\le$ 0.5 seconds (0 to 90%). --- ### 3. Electronic Components & Features #### A. Signal Conditioning The unit utilizes an internal operational amplifier circuit to provide **Zero and Span adjustments**. These are accessible via the front panel, allowing the user to calibrate the 0% and 100% resistance points to the 4mA and 20mA outputs respectively. #### B. Burnout Protection This model includes electronic **burnout protection**. If the potentiometer wire breaks (open circuit), the transmitter can be configured to drive the output signal to a specific state (Upscale $\ge$ 20.9 mA or Downscale $\le$ 3.5 mA) to signal a fault to the PLC/DCS. #### C. Power Supply Section The "M2" designation indicates a wide-range switching power supply capable of handling **100V to 240V AC**. It includes internal surge filtering to protect against electrical noise common in industrial environments. --- ### 4. Terminal Connection Map | Terminal No. | Function | Description | | :--- | :--- | :--- | | **1** | Output (+) | 4-20mA Positive | | **2** | Output (-) | 4-20mA Negative | | **3** | Input (H) | Potentiometer High (CW) | | **4** | Input (S) | Potentiometer Wiper (S) | | **5** | Input (L) | Potentiometer Low (CCW) | | **7** | Power (U) | AC Line Input | | **8** | Power (V) | AC Neutral Input | ---