PT100 RTD Sensor with Transmitter | 4-20mA Output | High Temp RTD Probe

This M20 PT100 temperature sensor combines a probe and transmitter. It's for industrial use. The PT100 sensor measures temperature. Its built-in electronics change the reading to a standard 4-20mA current loop signal. This is good for sending measurements to a PLC or controller. Features and Benefits - Integrated 4-20mA transmitter - It gives a signal that resists noise. It can go long distances without losing accuracy. - M20x1.5 threaded connection - The stainless steel housing makes a secure, pressure-tight fit in pipes and vessels. - -50°C to 500°C range - The probe measures temperatures in many processes. This includes chilled water and hot steam. - PT100 RTD element - This platinum resistance thermometer provides steady and repeatable temperature readings for process control. Applications - Checking the temperature of liquid, gas, or steam in industrial pipelines. - Measuring oil or coolant temperatures in engines and hydraulic systems. - Connecting to a control system for automated temperature setting in boilers or reactors. Safety & Preparation Before working with any electrical sensor, always ensure the power supply to the circuit is disconnected. This high temperature RTD probe is a precision sensor and should be handled with care to avoid damage to the sensing element. When installing, ensure the M20 x 1.5 thread size is compatible with your existing thermowell or connection point. Protective gloves are recommended when handling for extended periods. This product does not include a battery, so ensure your controller or data acquisition system can provide the necessary power. Identify standard RTD Values An RTD (Resistance Temperature Detector) sensor, like this PT100 temperature sensor, operates by changing its electrical resistance in response to temperature variations. A PT100 sensor specifically means it has a resistance of 100 ohms at 0 degrees Celsius. Understanding this baseline is crucial for calibration and troubleshooting. The 4-20mA output signal provided by the integrated transmitter converts this resistance change into a standard current loop, making it compatible with a wide range of industrial controllers. This allows for accurate temperature monitoring, particularly in high temperature applications. How to Test by Wire Configuration Testing an RTD sensor involves measuring its resistance. The method depends on the number of wires connected to the sensor. This high temperature RTD probe features a 4-20mA output, meaning it integrates a transmitter. However, understanding the underlying RTD wiring is still important for fault finding the sensor element itself before the transmitter stage. Always consult the wiring diagram provided with your specific sensor for precise connections to your controller. A. 2-Wire RTD A 2-wire RTD configuration is the simplest but can be prone to errors due to lead wire resistance. To test, disconnect the sensor from the circuit. Use a multimeter set to measure resistance (ohms). Connect the multimeter probes directly to the two sensor wires. At 0 degrees Celsius, a PT100 sensor should read approximately 100 ohms. Any significant deviation, or an open circuit reading, indicates a potential fault with the sensor element itself. This method is less common for precision sensors due to the uncompensated lead wire resistance. B. 3-Wire RTD (Most Common) The 3-wire RTD configuration, often found in precision sensor applications, compensates for lead wire resistance. This configuration typically uses two wires of the same colour connected to one side of the RTD element, and a third wire of a different colour connected to the other side. To test, disconnect the sensor. Measure resistance between the two like-coloured wires; this should be close to zero ohms (representing the lead wire resistance). Then, measure between one of the like-coloured wires and the third wire; this should give you the RTD's resistance (e.g., 100 ohms for a PT100 at 0°C), compensated for lead wire resistance.