PT100 Sensor Probe | Stainless Steel Sheath | 1/2 NPT Thread Head

This RTD PT100 temperature sensor gives you exact temperature data for industrial jobs. Its 200mm stainless steel probe works well in tough conditions. The standard 1/2" NPT thread makes it easy to put in tanks, pipes, and other equipment for steady monitoring. Features and Benefits - PT100 Platinum Element - This RTD sensor uses platinum for steady, repeatable measurements from -50°C to 250°C. - 304 Stainless Steel Body - The probe is made from corrosion-resistant steel. It's safe to use in water, oils, and other liquids. - Standard 1/2" NPT Thread - You can screw the sensor directly into common fittings. This creates a secure, leak-proof connection in industrial systems. - 3-Wire and 4-Wire Compatible - It works with both common wiring setups. A 3-wire PT100 sensor is accurate. A 4-wire setup gives the most precision by fixing lead wire resistance. Applications - Industrial Process Control - Check temperatures in manufacturing lines, chemical processing, and automated systems. - HVAC and Refrigeration - Manage temperatures in boilers, chillers, and large climate control equipment. - Fluid and Gas Monitoring - Track liquid or gas temperatures inside pipelines and storage tanks. Safety & Preparation Before working with any electrical component, including the PT100 Sensor Probe, ensure the power supply to the circuit is disconnected. This prevents electrical shock and damage to the sensor or controller. Handle the stainless steel sheath carefully to avoid bending or damaging the internal elements. When installing, use appropriate tools to secure the 1/2 NPT thread head, ensuring a tight seal without overtightening. The terminal head connectivity requires careful wiring; consult your controller’s manual for specific connection diagrams. Always verify the probe length (50mm, 100mm, 200mm) is suitable for your application before installation. Identify standard RTD Values An RTD (Resistance Temperature Detector) sensor, such as this PT100 Sensor Probe, functions by changing its electrical resistance in proportion to temperature. For PT100 sensors, 'PT' indicates platinum and '100' signifies 100 ohms of resistance at 0°C. This is a fundamental value for calibration and troubleshooting. Knowing this baseline allows you to check your RTD sensor’s functionality. If your PT100 sensor measures significantly different from 100 ohms at 0°C, it may be faulty or inaccurately calibrated. Always refer to the manufacturer's data sheet for specific resistance-temperature curves for precise measurements. How to Test by Wire Configuration To check an RTD sensor, you will typically use a multimeter to measure resistance. The method varies depending on the wire configuration. This PT100 Sensor Probe uses terminal head connectivity. Understanding the wiring helps identify issues like open circuits or shorts. The goal is to measure the resistance across the platinum element. Incorrect wiring can lead to inaccurate temperature readings or damage to the sensor or controller. Always ensure the sensor is at a known temperature when testing to compare the measured resistance against expected values for a PT100 sensor. A. 2-Wire RTD For a 2-wire RTD, resistance is measured directly across the two leads. Connect the multimeter probes to each of the two wires emerging from the terminal head. The reading will include the resistance of the sensing element plus the resistance of the lead wires. While simple, this method is less accurate, especially with longer lead lengths, as lead wire resistance can significantly impact the overall measurement. This PT100 Sensor Probe’s stainless steel sheath protects the internal components, ensuring consistent performance. Always account for lead wire resistance if using a 2-wire configuration for critical applications. B. 3-Wire RTD (Most Common) The 3-wire RTD configuration, often used with precision sensor applications, helps compensate for lead wire resistance, leading to more accurate readings. It uses two leads to measure the resistance of the platinum element and a third lead to measure the resistance of one of the lead wires. By subtracting the lead wire resistance, a more precise measurement of the sensor element’s resistance is obtained. To check a 3-wire RTD, measure the resistance between the two leads that connect to the sensing element, then measure the resistance between one of those leads and the third compensation lead.