ASME B40.200-2001 pdf download

ASME B40.200-2001 pdf download.THERMOMETERS, DIRECT READING AND REMOTE READING.
dial, mirror: a dial with a retlecior band for the purpose of reducing parallax error.
dial, multi-plane. a dial with graduations in approximately the same plane as the pointer (to reduce parallax error).
dial, rotatable: a feature that allows rotation of the dial relative to the pointer.
diameter, stem: the outside diameter of the stem.
element, bimetallic: the temperature-responsive component. it is composed of two or more metals mechanicafly associated in such a way that relative expansion of the metals, caused by temperature change, produces motion.
element, bimetallic helical: a bimetallic element formed in the shape of a helix.
environmental conditions: see conditions, environmental.
error: the difference between the true value and the indicated value of the variable being measured. A positive error denotes that the indicated value is greater than the true value. (See also correction.)
error, friction: the difference between the indicated values before and after the thermometer has been lightly tapped.
error, parallax: reading error induced by visual misalignment.
Fahrenheit: U.S. customary unit of temperature measurement, abbreviation °F.
failure, corrosion: failure caused by environmental or process-corrosive chemical attack.
failure, over-temperature: failure caused by environmental or process exposure to temperatures in excess of rated temperature limit. (See para. 6.3.)
failure, vibration: failure caused by exposure to vibration. (See para. 6.6.)
friction error: see error, friction. friction ring: see ring, friction.
graduations, dial. see dial, graduations.
hermetically sealed: see case, hermetically sealed. jam nut: see connector, jam nut.
length, immersion: the distance from the free end of the stem to the point of immersion in the medium.
stem length: see length, stem.
stem, plain: see connector, plain.
stop pin: a component on the dial that limits the motion of the pointer.
swivel nut: see connector, jam nut. threaded ring: see ring, threaded.
threaded window: see window, threaded.
thermometer, liquid-filled: one that contains a liquid to protect the internals from damage caused by vibration.
the rmowell: a pressure-tight receptacle adapted to receive a stem and provided with external threads or other means for pressure-tight attachment to a vessel or system.
traceability: documenaüon of the existence of a calibration chain between an instrument and he National Institue of Standards and Technology (formerly known as the National Bureau of Standards).
union connector: see connector, union.
union, lock nut: a component used to mount a thermometer having a threaded connector so that the dial may be oriented in a predetermined position.
well: see rhermowell.
window: a transparent component through which the dial is viewed.
window, heat-treated glass: a window of heat-treated (tempered) glass, which, when broken, will form small, granular pieces, usually with no jagged edges.
window, laminated glass: a window with two or more sheets of glass held together by an intervening layer(s) of clear plastic. When cracked or broken, the pieces of glass tend to adhere to the plastic.
window, plain glass: a window of commercial glass. window, plastic: a window of transparent plastic.
window, threaded: a window generally made of plastic with integral threads that match threads on the case. No separate ring is required.
3.5.1.2 Case Closure. Typical closure methods include threading the window directly to the case, retaining the window by a ring, or forming the case over the edge of the window.
3.5.2 Indication Adjustment. Some thermometers are provided with a pointer-adjusting device, which is accessible by removing the window; or with a dial- rotating mechanism, accessible without removing the window. Other thermometers are nonadjustable.
3.5.3 Dials
3.5.3.1 Units. Dials are normally graduated in either Fahrenheit or Celsius, or with two scales, such as Fahrenheit and Celsius. Dual-scale dials are useful where thermometers are employed on equipment that may be used internationally, or where users plan to convert from one unit of measure to another.
The unit of measure shall be noted on the dial, either by the word Fahrenheh or Celsius, or by the abbreviation F or C. The symbol ° is optional. The value of a subdivision may also be indicated.