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An alternative to the Pirani gauge is the thermocouple gauge, which works on the same principle of detecting thermal conductivity of the gas by a change in temperature. In the thermocouple gauge, the temperature is sensed by a thermocouple rather than by the change in resistance of the heated wire.
The ring under the spark plug is used to transfer the heat from the plug to the thermocouple. The gauge and cold junction are usually calibrated at room temperature, 72 °F (22 °C). Because the thermocouple is calibrated for room temperature, the gauge readings will only be 100% accurate at that engine compartment temperature.
In January 2014, a spending bill passed by the House appropriated $100 million for the GCV program, even though the Army had requested $592 million for the program for FY2014. The Army planned to spend 80 percent of its ground vehicle modernization budget on the GCV over the next five years, with costs ranging from $29–34 billion.
A thermocouple (the right most tube) inside the burner assembly of a water heater Thermocouple connection in gas appliances. The end ball (contact) on the left is insulated from the fitting by an insulating washer. The thermocouple line consists of copper wire, insulator and outer metal (usually copper) sheath which is also used as ground. [33]
GCV may refer to: United States Navy good conduct variation; Grand Cross of Valour, an honour of Rhodesia; Gross calorific value; Ground Combat Vehicle, a cancelled ...
is the resistance of the sensor at 100 °C. Pure platinum has α = 0.003925 Ω/(Ω·°C) in the 0 to 100 °C range and is used in the construction of laboratory-grade RTDs. [citation needed] Conversely, two widely recognized standards for industrial RTDs IEC 60751 and ASTM E-1137 specify α = 0.00385 Ω/(Ω·°C). Before these standards were ...
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