Comp. NTC, KTY, PRTD
On the basis of the following chart you can decide which type is most suitable for your application.
Thin Film Platinum RTD Platinum on ceramic substrate |
NTC Thermistor metal oxide |
KTY® Silicon, Barium Titanate |
Thermo- couples |
Operating temperature range from -196°C bis 1000°C |
Operating temperature range from -100°C to 300°C, with special types to 500 °C |
Operating temperature range from -55°C to +300°C |
Operating temperature range from -200°C to +1800°C, depending on type |
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Characteristic nearly linear and standardized to DIN EN 60751 |
Non-linear characteristic curve No international standard for curves |
Characteristic more linear than NTC thermistors over the operating temperature range; linearity deviation at least 0.6°C (with optimum linearization) |
International standardization of Thermocouple types |
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Temperature measurement range standard: -70°C to +500°C high: -40°C to 1000°C |
Temperature measurement range dependent upon type; typical range 200 K |
Temperature measurement range 200 K; standard: -55°C to +150°C |
Temperature measurement range -40°C to +1700°C (range depends on type), need of cold-junction compensation, e.g. with TF-PRTD element |
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Nominal resistance drift: 0.04% after 1000 h at +500°C |
Nominal resistance drift: 0.35% after 100h at 150°C |
Nominal resistance drift: 0.45% after 1250 h at 150°C |
Dependent upon thermometer design |
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Accuracy to DIN EN 60751, Class B: ± 0.21% at +100°C ± 0.33% at +500 °C |
Typical accuracies ± 1% resistance, +/-0.2°C over narrow temperature ranges |
Average accuracy ± 5% resistance highest accuracy: ±0.5% |
Accuracy of Tolerance Class 2, depending on type: 2.5°C or 0.0075 x I t I Cabling with compensation cables |
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Signal sensitivity consistent over the entire operating temperature range; for example, > 4 ohms/Deg K for Pt1000 |
High signal sensitivity, but only for certain temperature intervals; larger resistance change per Deg. K than Pt RTD or KTY |
High signal sensitivity, approx. 15 ohm/K |
SSensitivity ranges from µV/Deg K to mV/Deg K, depending upon thermocouple type |
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Models: Basic element with connecting wires or strips, SMD types, SOT223 and TO92 cases |
Models: Epoxy or glass encapsulation; diode (DO-35) package, SMD models, many variants; for automatic assembly |
Models: Glass case, SMD and diode (DO-35) package components |
Mineral-insulated Thermocouples, bare Thermocouple wires |
