PT100 Sensor | 2mm 3-Wire Stainless Probe | High Temp up to 200°C

This waterproof PT100 sensor has a very small 2mm or 3mm probe. It gets accurate temperature readings in tight spaces. The stainless steel housing is fully sealed. This mini PT100 probe can go directly into liquids. It gives accurate industrial or lab measurements. Features and Benefits - Small 2mm or 3mm probe - It fits into small ports and equipment. Standard sensors cannot go there. - Fully waterproof build - The sealed probe tip means it can be a submersible PT100 sensor. It monitors liquids. - Wide temperature range - It measures from -50°C up to 200°C. This makes it a useful high temperature PT100 probe. - 3-wire PT100 sensor setup - The third wire accounts for cable resistance. This gives more accurate readings than a 2-wire setup. This is especially true over longer distances. Applications - Industrial process control - It monitors fluid temperatures in small pipes, tanks, and machinery. - Laboratory settings - It gets precise temperature data from liquids. This includes beakers, vials, or test equipment. - HVAC and refrigeration - It checks coolant lines and system parts. This helps with diagnostics and performance tuning. Safety & Preparation Before working with any electrical components, always ensure the power supply to the system is completely disconnected. This prevents accidental shocks and damage to the sensor or controller. When handling the PT100 sensor, avoid bending or stressing the 2mm stainless steel probe excessively, as this could compromise its accuracy and IP67 protection. Ensure your hands are clean and dry to prevent contamination of electrical connections. A multimeter will be essential for testing. Identify standard RTD Values An RTD (Resistance Temperature Detector) sensor, like this PT100, measures temperature by correlating resistance with temperature. For a PT100 sensor, '100' indicates that it has a resistance of 100 ohms at 0 °C. As the temperature increases, so does the resistance. This particular sensor operates in a temperature range of -50 to 200 °C. Understanding these base values is crucial for checking the sensor's functionality and ensuring it's reporting accurate readings to your controller. How to Test by Wire Configuration To check an RTD sensor, you will need a multimeter capable of measuring resistance. The method varies slightly depending on the wiring configuration. Always refer to your controller's manual for specific connection requirements. This PT100 sensor uses a 3-wire configuration, which is common for achieving higher accuracy by compensating for lead wire resistance. Testing ensures the sensor is functioning correctly within its specified temperature range. A. 2-Wire RTD A 2-wire RTD sensor has two wires connected to the sensing element. To test, connect the multimeter to both wires and measure the resistance. Compare this reading to a known resistance-temperature chart for a PT100 sensor. If the sensor is at 0 °C, you should read approximately 100 ohms. Variations will occur with temperature changes within the -50 to 200 °C range. This configuration is generally less accurate for long wire runs as lead wire resistance is included in the measurement. B. 3-Wire RTD (Most Common) This 2mm 3-wire stainless probe is a common configuration for improved accuracy. It has three wires: two for current flow and one for voltage measurement, allowing the controller to compensate for lead wire resistance. To test, label the wires (e.g., A, B, C). Measure resistance between A and B, then A and C, and finally B and C. Two of these readings should be very close to each other (representing the lead wires), and one should be the sensor resistance plus one lead wire. At 0 °C, the sensor resistance will be around 100 ohms.