Sensor Probe | Stainless Steel RTD | 420mm Length with 1/2 Thread

This stainless steel RTD PT100 temperature sensor gives accurate, consistent measurements for industrial control and monitoring. The PT100 sensor probe works from -200°C to 420°C. Its threaded body makes a tight, leak-proof fit in pipes or tanks. Features and Benefits - Uses a Class A platinum RTD element - This offers better accuracy and long-term stability than most thermocouples in this range. - Has a 304 stainless steel probe and housing - This resists rust. It makes the waterproof PT100 sensor good for liquids, food processing, and chemical areas. - Mounts with a standard 1/2" NPT thread - It installs easily and securely into common ports on industrial gear, tanks, and pipes. - Has an aluminum terminal head - This protects the 3-wire connections from moisture and bumps. It also lets you get to the wiring easily. Applications - Checking liquid temperatures in brewing vats, chemical reactors, or water heaters. - Controlling temperature inside industrial ovens, kilns, and environmental chambers. - Measuring bearing or fluid temperatures in machines for upkeep. Safety & Preparation Before working with any electrical component, ensure the power supply to the system is completely isolated. This prevents electrical shock and damage to the sensor or controller. Always allow sufficient time for any system to cool down if high temperatures are involved, as this sensor is designed for temperatures up to 420°C. When handling, avoid bending or stressing the 420mm stainless steel probe unnecessarily, as this could compromise its accuracy. Have your multimeter ready and set to resistance (ohms) for testing. Identify standard RTD Values An RTD, or Resistance Temperature Detector, is a type of precision sensor used to measure temperature. It works by correlating resistance to temperature. A PT100 RTD, like this sensor probe, has a resistance of 100 ohms at 0°C. This is a fundamental value for checking the sensor's functionality. As the temperature increases, the resistance of the PT100 also increases in a predictable manner. This allows a controller to accurately interpret temperature based on the resistance reading. How to Test by Wire Configuration Testing an RTD sensor involves measuring its resistance with a multimeter. The method varies slightly depending on the number of wires. This sensor is an RTD PT100 type, and understanding its wiring configuration is crucial for accurate diagnostics. The goal is to measure the resistance across the platinum element. A. 2-Wire RTD A 2-wire RTD is the simplest configuration. It has two wires connected to the sensing element. To test, simply connect the multimeter leads to each of the two wires. The reading will indicate the total resistance, which includes the resistance of the platinum element and the resistance of the lead wires. While easy to test, the lead wire resistance can introduce inaccuracies, especially over long distances. This configuration is generally less precise than 3- or 4-wire RTDs. B. 3-Wire RTD (Most Common) A 3-wire RTD, which is the most common configuration for PT100 sensors, uses a third wire to compensate for lead wire resistance. To test, identify the two wires that show a resistance of approximately 100 ohms at 0°C (or a value consistent with ambient temperature). The third wire should show very low or zero resistance when measured against one of the other two wires. This allows a controller to subtract the lead wire resistance, providing a more accurate temperature reading.