basics of thermocouples and rtds
TRANSCRIPT
BASICS OFTHERMOCOUPLES &
RTDs
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Contents What is Temperature Sensor.
• Types of Temperature Sensors.
Thermocouples.
• Types Of Thermocouples.
• MI & Non MI Construction.
• Thermocouple Insert construction.
RTDs.
• Types of RTDs.
• Special RTDs.
• RTD Insert Construction.
Applications.
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What is Temperature Sensor ? The degree of Heat present in an object is called temperature and
the Device which is used to Measure the temperature is called Temperature Sensors.
The need of Temperature Sensor is to Quantify and Measure the Object’s Temperature.
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Types Of Temperature SensorsThermocouples.
RTDs (Resistance temperature
Detectors).
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Thermocouple Thermocouple is a pairs of dissimilar metal wire joint at one end, which
generate a net thermoelectric voltage between the open pair according to temperature difference between the ends.
A thermocouple is made of two or more metals joined together to form two junctions.• One junction is connected to an object whose temperature is to be
measured called as measuring junction.• Other junction is connected to an object of known temperature
called as reference junction.• This is how Thermocouple measures unknown temperature of the
object with reference to the known temperature of an another object.
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Types of Thermocouples
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Tolerance Table for Type Thermocouples
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MI & Non MI Construction
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Thermocouple Insert Construction
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RTDs (Resistance Temperature Detectors)
Resistance thermometer use metals that alter there electric resistance when heated.
Platinum is the most commonly used material for industrial RTD. However Copper and Nickel are also used for some applications.
The resistance at 0°C is called R and it is an important parameter to be defined. The most commonly used RTD element is of platinum with resistance of 100 O at 0 °C. Thus named as Pt 100.
Platinum RTD are suitable for temperature range -200 to 850°C. Normally industrial RTD’s are used up to temperature range of 400°C.
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Types of RTDs
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Tolerance Table for Type RTD
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Special RTDs
• Slide shoe bearing RTDs.• Vibration proof RTDs for Bearing & DG sets.• Motor & Transformer winding temperature RTDs.• Handheld & Probe in various designs.• RTDs with IBR approved Thermowells.• Strap on RTDs for nuclear application.• High Temperature RTDs up to 1/10 DIN.• Semi Standard PRTs with NABL Certificate.• Calibrated at Fixed points suitable up to 661°C.
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RTD Insert Construction
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Applications of Thermocouples & RTDs• Cement Industries
• Power Industries
• Steel Industries
• Glass Industries
• OEM’s Industries
• Non- Ferrous Industries
• R & D Industries
• Pharmaceutical Industries
• Petrochemical Industries
• Nuclear Industries.
• Chemical & fertilizers Industries
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