Specifications

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Siemens FI 01 · 2015 US Edition
Temperature Measurement
SITRANS TS500
Technical description
2
Measuring technology: Sensor elements
The diverse application spectrum for industrial temperature
measuring technology requires different sensor technologies.
Resistance thermometer
Sensor elements made of other basic materials with different
nominal resistances or different underlying standards are avail-
able on request. Resistance thermometers can be classified as
follows:
•Basic design:
The sensor element is built with thin layer technology. The
resistance material is applied in the form of a thin layer on a
ceramic carrier material.
• Versions featuring increased vibration-resistance:
In addition to the basic design, the vibration resistance is
improved through extra measures.
• Versions with expanded measuring range:
Elements in wire-wound design. The wire winding is embed-
ded in a ceramic body.
Thermocouples
Other thermocouples based on other thermo couples or under-
lying standards are available upon request.
The most common base metal thermocouples include:
• Type K (NiCr-Ni) more stable than type J, but drifts in upper
range.
• Type J (Fe-CuNi) narrow application band
Measuring technology: Measuring range
The measuring range describes the temperature limits within
which the thermometer can be used in a way that is meaningful
for measurement purposes. Depending on the loads present,
the thermowell materials and the desired accuracy levels, the
actual application range for the thermometer may be smaller.
Measuring technology: Measuring accuracy
Resistance thermometer
The tolerance classes of the resistance thermometers corre-
spond with IEC 751/EN 60751:
The following tables provide an overview of the scope of these
tolerances. If you exceed the specified limits with a resistance
thermometer, the values of the next lower accuracy class apply:
Resistance thermometer [°C (°F)]
Basic version and increased
vibration resistance
-50 ... +400 (-58 ... +752)
Expanded measuring range -196 ... +600 (-320.8 ... +1112)
Thermocouple [°C (°F)]
Type K -40 ... +1000 (-40 ... +1132)
Type J -40 ... +750 (-40 ... +1382)
Tolerance ∆t
Basic accuracy, Class B (0.30 °C +0.0050|t[°C]|)
(0.54 °F +0.0050|t [°F]-32|)
Increased accuracy, Class A (0.15 °C +0.0020|t[°C]|)
(0.27 °F +0.0020|t [°F]-32|))
High degree of accuracy,
Class AA (1/3 B)
(0.10 °C +0.0017|t[°C]|)
(0.18 °F +0.0017|t [°F]-32|))
Resistance thermometer
Basic version [°C (°F)]
Tolerance Range
Basic accuracy,
Class B
-50 ... +400 (-58 ... +752)
Increased accuracy,
Class A
-30 ... +300 (-22 ... +572)
High degree of accuracy
Class AA (1/3 B)
0 ... 150 (32 ... 302)
Resistance thermometer
Increased vibration-resistance [°C (°F)]
Tolerance Range
Basic accuracy,
Class B
-50 ... +400 (-58 ... +752)
Increased accuracy,
Class A
-30 ... +300 (-22 ... +572)
High degree of accuracy
Class AA (1/3 B)
0 ... 150 (32 ... 302)
Resistance thermometer
Expanded measuring range [°C (°F)]
Tolerance Range
Basic accuracy,
Class B
-196 ... +600 (-321 ... +1112)
Increased accuracy,
Class A
-100 ... +450 (-148 ... +842)
© Siemens AG 2015