Part # GCTRM Rev 3 (12/10/09)
Page 54
Thermocouples And How They Work
Thermocouples are used to generate voltage to hold a
magnet on a pilot safety valve. It plays an important part of
the flame safety system in a gas oven.
The thermocouple uses the combined effects of temperature
change and electricity. It consists of a bimetallic strip joined
at one end (called the hot junction). When the hot junction is
heated, a DC voltage is generated across the two other ends
of the strips (the cold junction).
The thermocouple is used to prove the pilot flame. If the pilot
flame goes out, the thermocouple prevents the main gas
from opening.
The magnitude of the voltage across the cold junction
depends on the:
• Two materials of the bimetallic strip
• Temperature difference between the hot and cold
junctions
The small amount of electricity produced is 20 to 30
millivolts. This millivoltage is used to hold open an
electromagnet assembly in the gas control. If the pilot
goes out, the thermocouple will cool down and no longer
generate electricity and in turn, de-energize the magnet,
closing the valve.
Hot
Junction
Dissimilar
Metals
Cold
Junctions
Negative Positive
Flame
Summary of Contents for G Series
Page 2: ...Part GCTRM Rev 3 12 10 09 Page 2...
Page 4: ...Part GCTRM Rev 3 12 10 09 Page 4...
Page 5: ...Part GCTRM Rev 3 12 10 09 Page 5 Section 1 Model Number Identification...
Page 17: ...Part GCTRM Rev 3 12 10 09 Page 17 Section 2 Serial Number Identification...
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Page 21: ...Part GCTRM Rev 3 12 10 09 Page 21 Section 3 Certification Markings...
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Page 25: ...Part GCTRM Rev 3 12 10 09 Page 25 Section 4 Properties And Characteristics of Fuel Gases...
Page 27: ...Part GCTRM Rev 3 12 10 09 Page 27 Section 5 Operation Of Controls...
Page 31: ...Part GCTRM Rev 3 12 10 09 Page 31 Section 6 Gas Valves And Adjustments...
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Page 49: ...Part GCTRM Rev 3 12 10 09 Page 49 Section 8 Gas Pressure Regulators...
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Page 53: ...Part GCTRM Rev 3 12 10 09 Page 53 Section 9 Thermocouples And How They Work...
Page 55: ...Part GCTRM Rev 3 12 10 09 Page 55 Section 10 Trouble Shooting The Oven Pilot Safety System...
Page 65: ...Part GCTRM Rev 3 12 10 09 Page 65 Section 13 Gas Technician s Glossary...
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Page 71: ...Part GCTRM Rev 3 12 10 09 Page 71 Section 14 Range Wiring Diagrams...
Page 75: ...Part GCTRM Rev 3 12 10 09 Page 75 3056100 US Range C836C Cuisine Series...
Page 76: ...Part GCTRM Rev 3 12 10 09 Page 76 229064 US Range 836C Cuisine Series...
Page 77: ...Part GCTRM Rev 3 12 10 09 Page 77 2706601 US Range Px S Series Left Single RC Oven...
Page 78: ...Part GCTRM Rev 3 12 10 09 Page 78 2706602 US Range Px S Series Right Single RC Oven...
Page 79: ...Part GCTRM Rev 3 12 10 09 Page 79 2706603 US Range Px S Series 2 RC Ovens...
Page 80: ...Part GCTRM Rev 3 12 10 09 Page 80 4514771 US Range Px SX Series Left Single RC Oven...
Page 81: ...Part GCTRM Rev 3 12 10 09 Page 81 4514772 US Range Px SX Series Right Single RC Oven...
Page 82: ...Part GCTRM Rev 3 12 10 09 Page 82 4514774 US Range Px SX SeriesTwo RC Ovens...
Page 83: ...Part GCTRM Rev 3 12 10 09 Page 83 2529700 ME MSTE 40RC Electric Spark...
Page 84: ...Part GCTRM Rev 3 12 10 09 Page 84 2529701 M MS 40RC...
Page 85: ...Part GCTRM Rev 3 12 10 09 Page 85 2529600 M MS 40 Electric Spark...
Page 86: ...Part GCTRM Rev 3 12 10 09 Page 86 2444200 Sentry Electric Spark...
Page 87: ...Part GCTRM Rev 3 12 10 09 Page 87 2444300 STE286RC STE284RC Left ST283RCE...
Page 97: ...Part GCTRM Rev 3 12 10 09 Page 97 Section 15 Service Bulletins...
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