It employes two dissimilar metals When two such dissimilar metals welded together at one end and subjected to heat, it develops a small DC voltage (EMF), corresponding to temperature....
When two such dissimilar metals welded together at one end and subjected to heat, it develops a small DC voltage (EMF), corresponding to temperature difference between hot junction (measuring junction) and cold junction (reference junction).
The temperature - EMF characteristics have an established pattern for different type of hermocouple elements like, T, J, K, N, E, R, S, etc.
Temperature - EMF characteristics conform to ANSI MC 96.1 / IEC 584 / DIN 43710 standards.
It employs high purity electrical resistance wire, non inductively wound on ceramic or glass base.
When RTD element is subjected to heat, it changes its electrical resistance value, corresponding to variation in temperature and its thermal coefficient (œ) (Alpha).
The temperature resistance characteristics have an established pattern for different resistance elements, like Copper, Nickel, Platinum etc.
Most commonly used resistance element is Platinum known as Pt 100 (100 ohms at 0°C).
Temperature resistance characteristics conform to DIN 43760 / IEC 751 / BSS 1904 / JIS C1604 standards.
Conventional thermocouple or RTD elements pass through multi bore insulators, encased in outer protection sheath and connected to temperature measuring instrument.
Mineral insulated (MI) sensors are insulated with tightly compacted high purity magnesium oxide powder, simplex or duplex, enclosed in various metal sheaths and connected to temperature measuring intrument.
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