ASME B40.100:2005 pdf download Pressure Gauges and Gauge Attachments
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This Standard (B40.1) is confined to analog, dial-typegauges,which,utilizing elastic elements, mechanicallysense pressure and indicate it by means of a pointermoving over a graduated scale.
This Standard does not include gauges of special configuration designed for specific applications, edge reading, deadweight or piston gages, or any other gaugesnot using an elastic element to sense pressure.
2 PRESSURE GAUGESGENERAL
2.1 Pressure Terms
See Fig. 1.
2.2 Pressure Gauge Components
See Fig. 2.
2.3 Pressure Gauge Terminology
absolute pressure: see pressure, absolute
absolute pressure gauge: see gauge, absolute pressure.accuracy: the conformity of a gauge indication to anaccepted standard or true value. Accuracy is the differ-ence (error)between the true value and the gauge indication expressed as a percent of the gauge span. It is thecombined effects of method, observer, apparatus, andenvironment.Accuracy error includes hysteresis andrepeatability errors, but not friction error. It is deter-mined under specific conditions. See Table 1.
Accuracy, reference: the accuracy of a gauge under refer-ence conditions [normalposition at 20C1C(approximately 68F2F) and 29.92 in.Hg (101.32 kPa)barometric pressurel.
adjustment,pointer indication: a means of causing achange in indication. The change is approximately equalover the entire scale. Some examples of this type ofadjustment are adjustable pointers, rotatable dials, rotat-able movements, and other similar items. This adjustment, if provided, is generally accessible to the gaugcuser (see para.3.3.4).
adjustment, span: a means of causing a change in theangle of pointer rotation for a given change in pressureThis adjustment is not generally accessible to thegauge user.
ambient pressure: see pressiire, ambient.
bar: a metric pressure unit equal to approximately14.50 psi (see paras.3.3.2.1 and 7.2).
bellows: a thin walled, convoluted elastic pressuresensing element (see Fig.3).
bezel: see ring.
Bourdon tube: a tubular elastic pressure-sensing element.May have “C”helical, spiral, or other form (see Fig. 3)brazing: a metal joining process wherein coalescence isproduced by use of nonferrous filler metal having amelting point above 425°C (800F), but lower than thatof the base metals joined.
calibration: the process of graduating the pressure scale oradjusting the mechanism to cause the gauge to indicatewithin specified accuracy limits.
calibration verification: the checking of a gauge by comparison with a given standard to determine the indication error at specified points of the scale.
case: the housing or container that supports, protects,and surrounds the internals.
case, liguid filled: a case that is filled with a liquid suchas glycerin or silicone fluid to at least 75% of its totalinternal volume. Liquid-filled cases may be either openfront or solid front types. The purpose of this construction is to exclude ambient corrosives or protect the inter-nals from damage caused by severe vibration orpulsation.
case, open front qwith case pressure relief: a case with apressure relief device or openings and no partitionbetween the pressure element and the window iseeFig.4, illustration (a)l. An alternate construction is aplastic window especially designed to relieve internalcase pressure.
case, open front without case pressure relief: a case having nopartition between the pressure element and the windowand no pressure relief devices or openings [see Fig. 4illustration (a)]
case, pressure tighf: a case capable of maintaining a pressure differential between the inside and the outside ofthe case.
case ring: see ring.
case, sealed; a case that is sealed to exclude ambient corro-
sives.
case, size: see size, &auge.
ASME B40.100:2005 pdf download
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