Cylinder head temperature guages (and most other high temperature measuring devices) use thermocouples as sending units. A thermocouple is a junction between two dissimilar metals. When this junction is heated, electrons pass from one metal to the other. Moving electrons = electric current. The greater the heat, the greater the current. If you hook a milliamneter to the output wires and calibrate it in degrees, you get a temperature guage, with no outside current input. As the current is teeny even at high temperatures, the resistance of the lead wires must be included in the calibration. If you add to or subtract from the wires, you will change the resistance, and thus the temperature reading. And now, back to our program.... H Steven Dolan dworkin@netcom.com
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