The **K3FS-RSP-1-F** is a high-performance **Signal Conditioner** (Isolator) manufactured by **Omron**. This device is specifically designed to convert a potentiometric resistance signal (from a sensor like a linear scale or rotary potentiometer) into a standardized DC voltage or current signal for PLC or controller input. --- ## 1. Core Electronic Specifications The "RSP" designation indicates a **Potentiometer Input** model. Below are the key electronic parameters: | Component / Feature | Specification Details | | :--- | :--- | | **Input Signal** | Potentiometer (Total resistance: 100 $\Omega$ to 10 k$\Omega$) | | **Output Signal** | 4 to 20 mA DC | | **Power Supply** | 100 to 240 V AC (50/60 Hz) | | **Accuracy** | ±0.1% FS (at 23°C) | | **Response Time** | 0.5 seconds max. (0 to 90%) | | **Isolation** | 3-way isolation (Input / Output / Power) | | **Insulation Resistance** | 100 M$\Omega$ min. (at 500 V DC) | --- ## 2. Key Electronic Functions ### A. 3-Way Isolation One of the most critical electronic features is the **Galvanic Isolation**. It separates the input, output, and power circuits. * **Purpose:** Prevents ground loops and protects sensitive PLC/DCS inputs from high-voltage surges on the field side. * **Dielectric Strength:** Typically rated for 2,000 V AC for 1 minute between terminals. ### B. Potentiometer Excitation The device provides a stabilized reference voltage (usually around 1.0V to 2.5V DC) to the potentiometer. * It measures the ratio of the wiper voltage relative to the total resistance, making the output highly stable even if the total resistance of the potentiometer drifts slightly due to temperature. ### C. Zero and Span Adjustment On the front panel, there are two electronic trimming potentiometers (multi-turn): 1. **ZERO Adjustment:** Sets the output to 4mA when the input sensor is at its minimum position. 2. **SPAN Adjustment:** Sets the output to 20mA when the input sensor is at its maximum position. --- ## 3. Terminal Connection Diagram The electronic wiring is simplified through an 8-pin plug-in base (typically the P2CF-08 or P3G-08). | Terminal No. | Function | Description | | :--- | :--- | :--- | | **2 & 7** | Power Supply | 100-240V AC Input | | **4 (+) & 5 (-)** | DC Output | 4-20mA Signal to Controller | | **1 (H), 3 (W), 8 (L)** | Potentiometer Input | H=High, W=Wiper, L=Low | --- ## 4. Operational Indicators The unit features a **Power LED** (Green) on the front face. If this LED is not illuminated, it indicates a failure in the internal switching power supply circuit or a lack of input AC voltage. ---