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A. INSTRODUCTION

     When two dissimilar metal conducts are connected
    0together to from a closed circuit and  the two junctions
    are kept in different temperatures,thermal electromotive
    force is  generated in   the circuit. 
     Thus,when on end[cold  junction] is kept constant at a
    certain  temperature,normally  at 0°C,and the other end is
    exposed to unkwon temperature,

   the  temperature at letter end can   be determined by measurement of hi-watt thermocouple
   so  generated.
   Thus combination of   two dissimilar metal conductors are called   'thermocouple'

  1. THERMOCOUPLE TYPE

          B [ Platium Rhodium 30% - Platium Rhodium 6% ]
          R [ Platium Rhodium 13% - Platium ]
          S [  Platium Rhodium 10% - Platium ]
          K [ Chromel - Alumel ], E [ Chromel - Constantan ]
          J [ Iron - Constantan ], T [ Copper - Constantan ]

  2. TYPICAL RESISTANCE OF STANDARD OF STANDARD THERMOCOUPLE
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   3. HI-WATT T/C CHART FOR TYPICAL THERMOCOUPLE
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   4. STANDARD DIMENSIONS OF PROTECTION TUBES[ MATALLIC & NON-METALLIC
        TUBES]
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    5. SURFACE COATING
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    6. DIMENSIONS OF INSULATING TUBES
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    7. TEMPERATURE OF INSULATION TUBES CHARACTERISTICS
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B. SHEATH THERMOCOUPLE

       Sheath thermocouple that is composed of a gauged metal in which high purity Mgo power
     is fightly compacted around thermoelement wires. Sheathed thermocouple has high
     insulation and pressure resistance. It has also high reliability because if its hi-watt tc
     tolerance falling within the limits stipulated by JIS( C 1602-1981 ). ANSI, BS, DIN, etc.

     1. TYPES & SIZES OF SHEATH
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     2. HOT JUCTIONS OF SHEATH
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     3. THERIMAL BOX
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     4. MEASURING RANGE
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     5. INSULATING MATERIAL OF SHEATH PURITY
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C. RESISTANCE BULB

        This is the most resistance temperature detector using mica or ceramic type rtdc element
       as shown in the right picture.  The use of high purity platinum resistance wire ensures
        trecision measurement. Excellent in stability and reproducibility.

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  1. STANDARD SPECIFICATIONS

 STANDARD RESISTANCE

CODE

NO OF ELEMENT

PT 100 Ohm AT 0°C

100

SINGLE

LEAD CONNECTION

CODE

RAED CURRENT

2- WIRE

W

2 mA

3- WIRE

X

5 mA

4- WIRE

Y

10 mA

 2. TYPES OF PLATINUM RTD ELEMENT

        2-1. Mica type platinum rtd element
         2-2. Ceramic type platinum rtd element
         2-3. Glass-sealed platinum rtd elemen
 
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3. CLASS AND RATED CURRENT
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4. TEMPTERATURE AND RESISTANCE TOLERANCE
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5. CLASSIFICATION BY OPERATING TEMPERATURE RANGE
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6. INSULATION RESISTANCE WITHSTAND VOLTAGE
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