The Temperature Sensor Specialists

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Category Archives: Pt100

Element and Assembly Resistance Thermometer Accuracy

Resistance Thermometer, Pt 100, RTD, whatever you call them, are devices that change resistance with temperature. They are available in a number of defined accuracy bands.

European Resistance Thermometers are usually available as 100Ω at 0°C and 138.5Ω at 100°C according to BS EN 60751 with a linear resistance change within and beyond these temperatures. Resistance Thermometers can be set to 500 or 1000 Ω

Elements can be rated to -200°C and up to +600°C.

RTD’s can be more accurate than Thermocouples, however the expected accuracy of an assembly can easily be misunderstood.

Common Resistance Thermometer Element Types

The Pt 100 sensing element is available in a number of forms:

Thin Film elements are the volume leader inexpensive device.… Read more

High Voltage Temperature Sensor Design

Temperature sensors regularly go into some very unpleasant environments. Usually this involves chemicals, pressure, temperature extremes or high vibration. Recently we had an enquiry for Resistance Thermometers (Pt 100) to go into high voltage transformers. The probe specification included a test at 3600V AC for 1 minute.  Peak Sensors had very little experience of a high voltage temperature sensor.

The best designs come from collaborative efforts. Peak Sensors knew all the details about making and protecting the probe. The customer was familar with high voltages.

Insulation

The usual insulating polymers (PVC, PTFE, PFA Silicon Rubber) used with temperature sensors were not good enough insulators.… Read more