Mineral Insulated or Fabricated thermocouples, as well as exposed junction thermocouples, in various sizes all in ANSI colours.
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Comparison of Sensor Types
|Thermocouple||Platinum Resistance Thermometer||Thermistor|
two dissimilar metals/alloys
|Platinum-wire wound or flat-film resistor||Ceramic
|Accuracy (typical values)||0.5 to 5.0°C||0.1 to 1.0°C||0.1 to 1.5°C|
|Long term Stability||Variable, Prone to ageing||Excellent||Good|
|Temperature range||-200 to1750°C||-200 to 650°C||-100 to 300°C|
|Thermal response||Sheathed – slow Exposed tip – fast 0.1 to 10 secs typical||Wirewound – slow
Film – faster 1-50 secs typical
|generally fast 0.05 to 2.5 secs typical|
|Excitation||None||Constant current required||None|
|Characteristic||Thermovoltage||PTC resistance||NTC resistance (some are PTC)|
|Linearity||Most types non-linear||Fairly linear||Exponential|
|Lead resistance effect||Short cable runs satisfactory||3 & 4 wire – low. 2 wire – high||Low|
|Electrical “pick-up”||susceptible||Rarely susceptible||Not susceptible|
|Interface||Potentiometric input. Cold junction compensation required||Bridge
2,3 or 4 wire
|2 wire resistance|
|Vibration effects/ shock||Mineral insulated types suitable||wirewound – not suitable. Film – good||Suitable|
|Output/ characteristic||From 10µV/°C to to 40µV/°C depending on type
||approx. 0.4 W/°C||-4% / °C|
|Extension Leads||Compensating cable||Copper||Copper|
|Wirewound – more expensive
Film – cheaper
Comments and values shown in this chart are generalised and nominal. They are not intended to be definitive but are stated for general guidance.