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



Related Terms

CASING

A covering of sheets of metal or other material such as fire resistant composition board used to enclose all or a portion of a steam-generating unit.

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).

SILICA

A scale-forming element found in some boiler feedwaters.

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.

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.

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.

CLEANABLE

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

CEILING

A covering usually of wood, placed over the tank top for its protection

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