Temperature measurement in industry is usually done mainly by below methods
- Direct :- RTD or Thermocouple
- Indirect :-
Temperature transmitter are generally recommended where distance between sensing element is more than 250 ft to avoid lead wire error .
Sensing element immersed should be 4.5 inch to avoid stem conduction error
Temperature Elements can be directly connected to the controller but it requires
- Temperature conversion cards
- Multi-channel Temperature cards
RTD signal is generated in ohms or mV
Thermocouple signal is generated in mA
Immersion length should vary between 1/3 to 2/3 of pipe depending upon wake frequently calculation
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Thermowell(TIPS for Selection)
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Temperature Gauges(TIPS for selection)
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Temperature Element RTD
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Temperature Element Thermocouple
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Temperature Transmitter
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Optical Pyrometer