The **FRTD-R-4WC-R** is an industrial-grade **Resistance Temperature Detector (RTD)** probe, specifically designed for high-precision temperature sensing in sterile or sanitary environments. --- ## 1. Core Electronic Specifications This component operates on the principle of electrical resistance changes relative to temperature fluctuations. | Feature | Specification | | :--- | :--- | | **Sensor Type** | RTD (Pt100) | | **Element Material** | Platinum (Pt) | | **Resistance at 0°C** | 100 $\Omega$ | | **Wiring Configuration** | 4-Wire (4WC) | | **Tolerance Class** | Class A (Standard) | | **Temperature Range** | -50°C to +200°C (Typical for sanitary) | --- ## 2. The "4-Wire" Circuitry Advantage The **"4WC"** in the part number stands for **4-Wire Configuration**. This is the most accurate way to wire an electronic temperature sensor. * **Lead Wire Compensation:** In 2-wire or 3-wire systems, the resistance of the copper lead wires can add error to the reading. * **Constant Current Loop:** A 4-wire circuit uses two wires to provide a constant current and two separate wires to measure the voltage drop across the Pt100 element. * **High Accuracy:** Because the measurement circuit has very high impedance, virtually no current flows through the measurement leads, eliminating lead-wire resistance errors entirely. --- ## 3. Physical & Mechanical Integration The "R" suffix and the general series code indicate the physical housing used to protect the delicate platinum electronics. * **Sanitary Fitting:** Often features a Tri-Clamp or flange design to prevent bacterial growth in food/pharma applications. * **Protection Tube:** The internal platinum element is encapsulated in a stainless steel sheath (316L) to protect it from moisture and pressure. * **Connection Head:** Usually features a terminal block for field wiring or an integrated 4-20mA transmitter. --- ## 4. Typical Applications The electronic precision of the FRTD series makes it ideal for: 1. **Pharmaceutical Fermentation:** Precise heat control for microbial growth. 2. **CIP (Clean-in-Place) Systems:** Monitoring high-temperature caustic wash cycles. 3. **Dairy Processing:** Ensuring pasteurization temperatures are met within 0.1°C.