Thermocouple (T / C)

     Resistance Temperature Detector (RTD)

• 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 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.

ENCLOSURE

• Staninless Steel, Die Cast Aluminium with cable entry.
• Protection : IP, Flame Proof Gr IIA, IIB or IIC, Increased Safety.
• Termination : Brass/SS connectors with markings for polarity, colour codes and type of Thermocouples.
  Spring Loaded Terminal Block - if required.