The **FRTD-R-30-R** is a specific model within the series of **Flat-type Resistance Temperature Detectors (RTDs)**. These sensors are primarily used for surface temperature measurement where space is limited and a low profile is required. --- ### 1. Component Overview An RTD operates on the principle that the electrical resistance of a metal changes predictably with temperature. The "FRTD" designation typically refers to a Thin Film Platinum sensor mounted on a ceramic substrate, encapsulated for protection. | Feature | Specification Details | | :--- | :--- | | **Sensor Type** | Pt100 or Pt1000 (Platinum Resistance) | | **Form Factor** | Flat, Thin-film | | **Resistance at 0°C** | 100 $\Omega$ (Standard for R-30 series) | | **Temperature Coefficient** | 0.00385 $\Omega$/$\Omega$/°C (DIN/IEC 60751) | | **Configuration** | Usually 2-wire or 3-wire (Model dependent) | --- ### 2. Breakdown of the Model Code While specific manufacturers (like Hayashi Denko or similar industrial brands) use this nomenclature, the parts generally break down as follows: * **FRTD:** Flat Resistance Temperature Detector. * **R:** Refers to the "Ribbon" or "Round" lead wire type depending on the specific manufacturer catalog. * **30:** Often denotes the physical dimensions (e.g., 3.0mm width) or the lead wire length. * **-R:** Often signifies a "Right-angle" lead exit or a specific "RoHS" compliance rating. --- ### 3. Electrical Characteristics To integrate this part into a circuit, you must consider the following electronic parameters: #### A. Self-Heating Because a current must be passed through the resistor to measure voltage, the sensor will generate a small amount of heat. * **Maximum Current:** Generally kept below **1mA** to prevent measurement errors. #### B. Accuracy Classes RTDs like the FRTD-R-30-R usually follow international standards: * **Class A:** $\pm(0.15 + 0.002|t|)$ °C * **Class B:** $\pm(0.30 + 0.005|t|)$ °C #### C. Wiring Interface Typical interface circuits include: 1. **Wheatstone Bridge:** For high-precision analog conversion. 2. **Constant Current Source:** Paired with an ADC (Analog-to-Digital Converter) like the MAX31865. --- ### 4. Typical Applications * **Semiconductor Equipment:** Monitoring the temperature of wafer plates. * **Medical Devices:** Surface monitoring of diagnostic equipment. * **Power Electronics:** Monitoring heat sink temperatures to prevent thermal runaway.