RTD Pt100 Probe Temperature Sensor with PTFE Flying Lead – PPL1-P

What is an RTD temperature probe?

An RTD temperature probe is a sensor used to measure temperature. RTD stands for Resistance Temperature Detector. It consists of a wire made of a material whose resistance changes with temperature. By measuring the resistance of the wire, the temperature can be determined accurately and reliably.

What is a Pt100 probe?

A PT100 probe is a type of RTD (resistance temperature detector) that consists of a platinum resistance element. It is based on the principle that the electrical resistance of platinum varies predictably with temperature changes. The platinum wire serves as the sensing element, and its resistance is measured by passing a small electrical current through it. The PT100 is the most common RTD, calibrated at 0°C (the most common calibration temperature), where it has a resistance value of 100 ohms. This base resistance, combined with the well-defined resistance vs temperature characteristics of platinum, allows for accurate temperature measurement over a wide range. PT100 probes are available in various DIN (German Institute for Standardisation) classes, such as DIN Class B and DIN Class A, which define the tolerance or accuracy of the resistance element. The higher the DIN class, the tighter the combination of both base resistance tolerance and resistance-temperature relationship tolerance. These probes are connected to the instrument's sensor input using lead wires, which can introduce some resistance error if not properly compensated for. However, PT100 probes are designed to be highly accurate, stable, and resistant to vibration and other environmental factors, making them suitable for numerous industrial and scientific applications where precise temperature measurement is critical.

What is a PTFE lead?

A PTFE lead refers to a lead or wire that is insulated with PTFE (polytetrafluoroethylene) material. PTFE is a type of fluoropolymer known for its excellent electrical insulation properties and high resistance to heat, chemicals, and moisture. PTFE leads are commonly used in various applications, including electrical and electronic industries, where reliable and durable insulation is required for transmitting signals or power while maintaining protection against external factors. The PTFE insulation ensures good electrical performance and flexibility while offering resistance to harsh environments.

What is the difference between a PT100 RTD probe and a thermocouple in terms of temperature measurement?

A PT100 RTD (Resistance Temperature Detector) probe measures temperature by detecting changes in the resistance of a platinum element, providing excellent stability and accuracy. Thermocouples, on the other hand, measure temperature based on the voltage generated at the junction of two dissimilar metals, typically nickel alloys. PT100 probes offer higher accuracy, better long-term stability, and are less prone to drift compared to thermocouples. However, thermocouples have a faster response time, can withstand higher temperatures, and are generally of lower cost. In industrial applications, PT100 probes are often preferred for precise and stable temperature measurement, while thermocouples are chosen for high-temperature or fast-response requirements.

How does a PT100 thermometer work, and why is platinum used in its construction?

A PT100 thermometer works by measuring the change in resistance of a platinum element as temperature varies. Platinum is used due to its excellent stability, linearity, and corrosion resistance over a wide temperature range. The platinum element is usually encased in a protective sheath, which can be made of materials like stainless steel or Inconel to protect it from harsh environments and high pressures. The change in the sensor's resistance is measured in ohms and converted to a temperature reading by the connected instrumentation. The PT100 probe's terminal head or terminal housing connects the platinum element to the external circuitry via a connector.

What are the IEC standards for PT100 probes, and how do they ensure accuracy?

IEC 60751 defines the tolerances, interchangeability, and construction of platinum resistance thermometers. This standard ensures consistent performance and accuracy across different manufacturers and applications.

What is the process of PT100 probe calibration, and how often should it be done

Calibration involves comparing the probe's readings to a known temperature standard and adjusting the connected instruments for accuracy. Frequency depends on usage, application, and required accuracy, but generally includes initial use, periodic checks (e.g., annually), after extreme conditions, or after repairs. Regular calibration ensures continued accuracy and reliability.