PT100 Sensor with Transmitter | M20x1.5 Thread | 4-20mA RS485

This armored PT100 sensor gives accurate temperature readings in tough industrial settings. The metal casing protects the sensing element from vibration, moisture, and physical impact. This helps ensure steady performance. It's made to connect directly into process control systems with a standard M20x1.5 thread. Features and Benefits - Stainless Steel Sheath - Protects the internal PT100 element. You can carefully bend it to fit into tight spaces. - Integrated Transmitter - Changes the RTD signal to a stable 4-20mA, 0-5V, or RS485 output for sending over long distances. - Accurate RTD Element - A PT100 RTD gives better accuracy and stability than a typical K-type thermocouple for important processes. - Wide Temperature Range - Measures temperatures from -50°C up to 450°C. It works for ovens, tanks, and pipelines. Applications - Industrial Ovens and Furnaces - Monitor internal temperatures with a sensor made for harsh, hot places. - Liquid and Gas Pipelines - Install directly into pipes using the threaded connection to measure fluid temperatures precisely. - HVAC and Refrigeration - Track temperatures in large cooling and heating systems for good efficiency and control. Safety & Preparation Before working with any PT100 sensor, ensure the power supply to the circuit is disconnected. This prevents electrical shock and potential damage to the sensor or controller. Always handle the sensor carefully to avoid bending or damaging the armored construction. When installing the M20x1.5 thread, use appropriate tools to ensure a secure fit without over-tightening. Verify that the output signal (4-20mA, 0-5V, RS485) is compatible with your receiving device before making connections. Refer to your system’s documentation for correct wiring diagrams for your specific controller. Identify standard RTD Values An RTD (Resistance Temperature Detector) is a precision sensor that measures temperature by correlating resistance with temperature. The PT100 sensor, as in this product, is a common type of RTD. "PT" indicates it's made from platinum, and "100" signifies it has a resistance of 100 ohms at 0°C. Other common RTD values include PT500 (500 ohms at 0°C) and PT1000 (1000 ohms at 0°C). J-type and K-type thermocouples are different sensor types also used for temperature measurement, employing different principles than RTDs. How to Test by Wire Configuration To check an RTD sensor, you will typically measure its resistance. This measurement will vary with temperature, so comparing it to a known temperature (e.g., room temperature) and the sensor's resistance table is crucial. The number of wires on an RTD determines how you test it and how accurately it compensates for lead wire resistance. This product offers PT100, J-type, and K-type sensor options, each requiring specific testing methods. A. 2-Wire RTD A 2-wire RTD is the simplest configuration. To test, connect an ohmmeter directly across the two wires. The measured resistance will include both the sensor's resistance and the resistance of the lead wires. This configuration is generally less accurate for applications requiring high precision over long distances because it cannot compensate for lead wire resistance. Ensure the connections are clean and secure for an accurate reading. Compare the reading to a known resistance-temperature chart for a PT100 sensor. B. 3-Wire RTD (Most Common) The 3-wire RTD is the most common configuration for PT100 sensors because it provides better accuracy by compensating for lead wire resistance. To test, connect the ohmmeter between one of the common wires (usually red) and each of the two other wires (usually white). The resistance between the common wire and each of the other wires should be approximately equal. The difference between these two readings represents the lead wire resistance, which the controller can then subtract for a more accurate temperature reading.