(suction pyrometer) a device for measuring furnace gas temperature. It is comprised of a thermocouple, which has been recessed into an insulating shroud, and a suction device such as an eductor, which aspirates large volumes of furnace gas through the shroud and past the thermocouple. The high velocity of a gas ensures good convective heat transfer to the thermocouple and surrounding furnace. The velocity thermocouple represents the most accurate means to measure flue gas temperature. Bare thermocouples are unacceptable for this purpose, being in error often by more than 100o F due to radiation losses.

Related Terms

RESTRICTOR

A device for producing a deliberate pressure drop or resistance in a line by reducing the cross-sectional flow area.

SAFETY CONTROL

Device to stop unit, equipment or system if unsafe pressure and/or temperatures and/or dangerous conditions are reached.

AIR COOLER

A factory-encased assembly of elements whereby the temperature of air passing through the device is reduced.

AIR COOLER

A factory-encased assembly of elements whereby the temperature of air passing through the device is reduced.

BUBBLE POINT

The differential gas pressure at which the first steady stream of gas bubbles is emitted from a wetted filter element under specified test conditions.

FILTER ELEMENT

The porous device that performs the actual process of filtration. Also known as Cartridge

ARC

A flash, caused by an electric current ionizing a gas or vapor.

CLEAN ROOM

A facility or enclosure in which air content and other conditions (such as temperature, humidity, and pressure) are controlled and maintained at a specific level by special facilities and operating processes and by trained personnel.

COMPRESSOR

A device which converts mechanical force and motion into pneumatic flow power.

ABSOLUTE ZERO TEMPERATURE

Temperature measured from absolute zero (-459.67°F, or -273.16°C).

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