TST310
6
Hauser
Self heating
RTD elements are passive resistances that are measured using an external current. This measurement current
causes a self heating in the RTD element itself which in turn creates an additional measurement error. In
addition to the measurement current the size of the measurement error is also affected by the temperature
conductivity and flow velocity of the process. This self heating error is negligible when an Hauser
iTEMP
®
temperature transmitter (very small measurement current) is connected.
Calibration specifications
Hauser provides comparison temperature calibration from -80 to +600 °C (-110 °F to 1112 °F) based
on the International Temperature Scale (ITS90). Calibrations are traceable to national and international
standards. The calibration report is referenced to the serial number of the thermometer.
Material
Cable probe and process connection.
The temperatures for continuous operation specified in the following table are only intended as reference values
for use of the various materials in air and without any significant compressive load. The maximum operation
temperatures are reduced considerably in some cases where abnormal conditions such as high mechanical load
occur or in aggressive media. Please observe also the measuring range of the temperature sensor (
Connecting cable insulation
Cable probe: Ø6 mm (0.24 in) and Ø3 mm (0.12 in) Minimum insertion length in mm (in)
Temperature range
-80 °C to -40 °C (-110 °F to -40 °F)
200 (7.87)
-40 °C to 0 °C (-40 °F to 32 °F)
160 (6.3)
0 °C to 250 °C (32 °F to 480 °F)
120 (4.72)
250 °C to 550 °C (480 °F to 1020 °F)
300 (11.81)
Material name Short form
Recommended max.
temperature for
continuous use in
air
Properties
AISI 316L/
1.4404
X2CrNiMo17-12-2
650 °C (1200 °F)
• Austenitic, stainless steel
• High corrosion resistance in general
• Particularly high corrosion resistance in chlorine-based and acidic, non-oxidizing atmospheres
through the addition of molybdenum (e.g. phosphoric and sulfuric acids, acetic and tartaric
acids with a low concentration)
• Increased resistance to intergranular corrosion and pitting
AISI 316Ti/
1.4571
X6CrNiMoTi17-12-2 700 °C (1292 °F)
• Properties comparable to AISI316L
• Addition of titanium means increased resistance to intergranular corrosion even after welding
• Broad range of uses in the chemical, petrochemical and oil industries as well as in coal
chemistry
• Can only be polished to a limited extent, titanium streaks can form
Designation
Features
PVC (polyvinyl
chloride)
• Very good acid resistance
• High hardness, resistance to inorganic chemicals, particularly acids and alkalis
• Low impact strength and low temperature stability
Silicone
• Flame-retardant, flame-resistant
• Permanently elastic at high and low temperatures
• Aging and weather-resistant
• Ozone and UV-resistant
• Oil, solvent, and fuel-resistant (fluorosilicones), water-repellent
• Flue gas-resistant
PTFE
• Resistance to nearly all chemicals
• Good mechanical loading capacity over a broad temperature range
• Working temperature up to +200 °C (+392 °F)
