Platinum Resistance Thermometer (RTD, PRT, Pt100 Sensor)
A Platinum Resistance Thermometer, commonly referred to as RTD Sensors, PRT Sensors or Pt100 Sensors, is a type of resistance temperature sensor used for a wide variety of temperature measurement applications. There are many types of Resistance Thermometer, but typically Pt100 (made using a Platinum element with a resistance of 100 ohms @ 0ºC and typically with a 38.5 ohm fundamental interval - change in resistance over the range 0 to 100ºC), available in a wide range of designs and constructions as shown below.
We are the largest manufacturer of Platinum Resistance Thermometers (RTD sensors) in Europe. Having an enormous range of components in stock means we can make virtually any sensor you specify. We can ship custom built RTD Sensors typically within 5 days or sooner.
Typical Platinum Resistance ThermometerResistance Thermometers (Pt100, RTD, PRT) -
Mineral Insulated Our most popular style of RTD sensor and ideal for most applications. Vast choice of terminations e.g. pot seals, cables, connectors, heads etc. Resistance Thermometers (Pt100, RTD, PRT) -
Rigid Stem Ideal for rigid stem applications or where the sensor is shorter than 50mm, limited to 250°C. Wide choice of terminations Hand Held
Resistance Thermometers (Pt100, RTD, PRT)A range of hand held RTD Sensors to suit a variety of applications from general purpose to surface and air temperature measurements Resistance Thermometers (Pt100, RTD, PRT) -
for Surface Measurements A wide range of RTD sensors for surface measurements including self adhesive patch, pipe, magnetic etc. Miniature
Resistance Thermometers (Pt100, RTD, PRT) 1.5 and 2.0mm diameter sensors ideal for precision temperature measurements where minimal displacement and a fast response is required Swaged Tip
Resistance Thermometers (Pt100, RTD, PRT) Fast response RTD sensors ideal for industrial and other applications Autoclave
Resistance Thermometers (Pt100, RTD, PRT) RTD sensors designed specifically for the harsh environments in autoclaves Other Popular Styles
of Resistance Thermometers (Pt100, RTD, PRT) - A wide range of RTD Sensors to suit many applications. Bayonet, bolt, stator slot, basic element styles etc.
Resistance Thermometer Materials and Theory
Several materials are available with a predictable and stable temperature versus resistance relationship such as copper, silver and gold but platinum has considerable advantages that make it well suited to resistance thermometry.
Most industrial resistance thermometer use a platinum element with a resistance of 100 ohms at 0°C, this resistance changes as the temperature changes. Resistance Thermometers are commonly used from temperatures of -50ºC to +250ºC and are favoured over thermocouples because they have a better accuracy over this range.
A constant current is applied to the RTD and the resultant volt drop as resistance changes is measured. Assemblies wired as 2, 3 or 4-wire are available - the 3 and 4 wire versions compensating for lead resistances.
A more detailed explanation of resistance thermometer theory along with technical information and data can be found here.