A thermometer whose sensitive element has been made to approximate a black body by covering it with lampblack.



Related Terms

LIQUID-IN-METAL THERMOMETER

A thermometer in which the thermally sensitive element is a liquid contained in a metal envelope, frequently in the form of a Bourdon tube.

LIQUID-IN-GLASS THERMOMETER

A thermometer in which the thermally sensitive element is a liquid contained in a graduated glass envelope; the indication of such a thermometer depends upon the difference between the coefficients of thermal expansion of the liquid and the glass; mercury and alcohol are liquids commonly used in meteorological thermometers.

PROPORTIONAL CONTROL

A mode of control in which there is a continuous linear relation between value of the controller variable and position of the final control element (modulating control).

BEARING CREEP

Area of rolling element changes. Inner race slowly creeps around shaft.

BRIDGING

A condition of filter element loading in which contaminant spans the space between adjacent sections of a filter element, thus blocking a portion of the useful filtration.

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.

CARBON

A non-metallic element - No. 6 in the periodic table. Diamonds and graphite are pure forms of carbon. Carbon is a constituent of all organic compounds. It also occurs in combined form in many inorganic substances; i.e., carbon dioxide, limestone, etc.

BURST PRESSURE RATING

The maximum specified inside-out differential pressure that can be applied to a filter element without outward structural or filter-medium failure.

CLEANABLE

A filter element which, when loaded, can be restored by a suitable process, to an acceptable percentage of its original dirt capacity.

SILICA

A scale-forming element found in some boiler feedwaters.

Related questions

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