What Is Pt500 Temperature Sensor? You are here: Home / What Is / What Is Pt500 Temperature Sensor? Pt500 sensors are a rare type of platinum resistance thermometer. Pt refers to that the sensor is made from Platinum (Pt). 500 refers to that at 0°C sensor has a resistance of 500 ohms (Ω). See definition: Resistance thermometer View Our RTD Sensors If you want to order a temperature sensor or you are unsure exactly what you need, get in touch and we can help you. Contact Us Share on facebook Share on twitter Share on linkedin