IS 12257-3: Pneumatic measurement, Part 3: Parameters of instruments working on high pressure

9 Pages·1992·1.1 MB·English

by  Bureau of Indian Standards

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IS 12257-3 (1992): Pneumatic measurement, Part 3:
Parameters of instruments working on high pressure [PGD 25:
Engineering Metrology]
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Indian Standard
PNEUMATICMEASUREMENT
PART 3 PARAMETERS OF INSTRUMENTS
WORKING ON HIGH PRESSURE
UDC 531’71’082’32

@ BIS 1992
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DEL HI 110002
lmy 1992 Price Group 1
gnireenignE ygolorteM lanoitceS ,eettimmoC ML 05
FOREWORD
sihT naidnI dradnatS was detpoda yb eht uaeruB fo naidnI Standards, retfa eht tfard dezilanif yb eht
gnireenignE ygolorteM lanoitceS eettimmoC had neeb devorppa yb eht thgiL lacinahceM gnireenignE
noisiviD .licnuoC
riA gauging has neeb gaining rediw ytilibatpecca ni yrtsudni esuaceb fo its ,ycarucca ycnatsisnoc and
.ytilibailer esehT nac eb desu rof no enil tnemerusaem fo parts as yeht erad gnieb denihcam and ekat
evitcerroc .snoitca
sihT standard seificeps eht suoirav sretemarap deriuqer rof hgih erusserp egnar citamuenp tnemurtsni
rof lanoisnemid .stnemerusaem tI is ton elbissop ot yficeps eht seulav fo all ,sretemarap ecnis yeht
reffid htiw tnereffid gnirusaem .stnemurtsni tI yllacisab smrof a enilediug rof eht resu ot esoohc eht
thgir gnirusaem .tnemurtsni ehT seulav and eht gnitset evah neeb deificeps desab no eht lareneg
secitcarp fo eht .srerutcafunam
sihT naidnI dradnatS has neeb dehsilbup ni ruof parts. rehtO parts fo this standard era detsil
:woleb
traP I lareneG noitamrofni no selpicnirp and ,sdohtem
traP 2 ngiseD serutaef fo stnemurtsni gnikrow ni hgih erusserp ,egnar and
traP 4 lareneG noitamrofni and selpmaxe fo .noitacilppa
nI eht noitaraperp fo this standard elbaredisnoc assistance has neeb devired morf NID 2271 ( 3lieT 67-)
citamuenP‘ htgneL tnemerusaeM ( riA gniguaG ) sretemaraP fo stnemurtsnI gnikroW ni eht hgiH
erusserP egnaR stnemeriuqeR ’gnitseT issued yb eht sehcstueD tutitsnI ruf gnumroN ( NID 1.
SI 12257 ( traP 3 ) : 1992
Indian Standard
PNEUMATICMEASUREMENT
PART 3 PARAMETERS OF INSTRUMENTS
WORKING ON HIGH PRESSURE
1 SCOPE 3.7 Measuring Force
sihT standard srevoc eht sretemarap fo citamuenp ehT gnirusaem ecrof is eht ecrof hcihw eht gauging
stnemurtsni desu rof lanoisnemid tnemerusaem tnemele strexe no eht tcejbo gnieb .detset
hcihw etarepo htiw a metsys erusserp >50 - kPa With gauging stnemele hcihw etarepo tuohtiw
( 0.5 rab .)
tcatnoc htiw eht krow ecafrus eht gnirusaem ecrof
2 ECNEREFER is detaerc yb eht ria gniwolf tuo fo eht tej otno
eht tcejbo gnieb .detset sihT gnirusaem ecrof ni
SI 2092 : 1983 regnulP‘ epyt dial seguag (Jirsi tsom fo eht sesac nac eb .detcelgen
noisiver ’) is yrassecen tcnujda ot this standard.
lacinahcem-htiW tcatnoc epyt fo gauging tnemele
3 YGOLONIMRET ti is eht ecrof detrexe yb eht stcatnoc no eht tcejbo
rednu tset and this must eb nekat otni .tnuocca
3.1 ylppuS Pressure
3.8 evitalumuC rorrE
The ylppus erusserp is eht erusserp that stsixe
erofeb eht erusserp rotaluger fo citamuenp htgnel ehT evitalumuc rorre is eht etanidro ecnatsid
gnirusaem .tnemurtsni neewteb eht tsehgih and eht tsewol tniop no eht
evruc fo eht lautca snoitairav fo eht detacidni
3.2 System Pressure eulav revo eht gnirusaem .egnar
The metsys erusserp is eht erusserp that stsixe retfa 3.9 ytilibataepeR
eht erusserp .rotaluger sihT yam oka eb demret
ehT ytilibataeper is eht ecnereffid neewteb eht
as yramirp .erusserp
mumixam and eht muminim detacidni eulav htiw
3.3 Secondary Pressure detaeper stnemerusaem at a cificeps tniop fo eht
gnirusaem .egnar
In the case fo stnemurtsni hcihw esu eht erusserp
gnirusaem ,dohtem eht yradnoces erusserp is eht 4 TNEMERIUQER
erusserp that stsixe neewteb eht tolip tej and
4.1 sretemaraP
gnirusaem .tej
sretemaraP nevig ni elbaT 1 shall eb deificeps ni
3.4 riA noitpmusnoC
eht lacinhcet erutaretil fo hcae .rerutcafunam
ehT ria noitpmusnoc is eht ytitnauq fo ria gniwolf
morf eht tnemurtsni ni a deificeps .emit Table 1 Parameters

3.5 gnitteS emiT retemaraP tinU
gnirusaeM egnar mp
ehT gnittes emit srefer ot eht doirep fo emit elacS eulav mp
hcihw is deriuqer ot adjust tnemurtsni os that ytivitisneS
eht detacidni eulav sniamer nihtiw %1 fo eht ylppuS erusserp Pa
gnirusaem egnar that is, eht emit nekat ni metsyS erusserp Pa
noitisnart fo eerf ria wolf ot gnirusaem eulav .wolf riA noitpmusnoc h/3m
gnitteS emit s
3.6 ytivitisneS
ehT ytivitisnes is eht oitar fo eht egnahc ni eht t.4 elbissimreP noitaiveD
noitacidni ot eht egnahc fo eht ytitnauq ot eb elbissimreP snoitaived fo eht gnitacidni tnemurtsni
,derusaem hcihw sesuac this .egnahc gnidulcni eht gauging tnemele nevig ni elbaT 2
ylppa nehw eht gnitacidni tnemurtsni is ni lamron
nehW gnignahc eht ,ytivitisnes eht stnemele hcihw
noitisop and eht gauging tnemele detnuom yltcerid
nrevog eht ytivitisnes must eb .degnahc esehT
no eht .tnemurtsni
:era
4.3 eIacS
)a gauing
In the case of column instrument -
tnemele gnirusaem ebut htiw gnitaolf ydob 4.3.1 ehT elacs shall eb detaudarg htiw llew
and elacs denifed senil hcihw era elbigel and ylraelc .elbisiv
)b 4.3.2 ehT htdiw fo eht noitaudarg senil dluohs eb
In the case of indicating instruments -
gauging ,tnemele tolip tej and elacs tuoba %01 ot %51 fo eht gnicaps neewteb .meht
1
IS 12257 ( Part 3 ) : 1992
4.3.3 ehT ecnatsid neewteb eht sertnec fo tnecajda nevig ni elbaT 2.
snoitaudarg shall eb at tsael- 4 mm ni eht esac fo~
nmuloc epyt units and at tsael 2 mm ni eht esac fo 5.3 Repeatability
gnitacidni .stnemurtsni
ehT ytilibataeper yain eb denimreted at yna
4.3.4 ehT elacs eulav shall ,eb ylraelc dekram no noitisop no eht gnirusaem egnar yb 5 -erusaem
eht dial htiw eht laciremun eulav and eht ,, units. ,. ments . ehT mumixam ecnereffid thus deniatbo
shall ton deecxe eht eulav nevig ni elbaT 2.
5 GNITSET
5.1 ehT gnitacidni tnemurtsni shall eb dekcehc 5.4 siseretsyH fo eht derusaeM Value
htiw a detceles nepo tej gnirusaem eborp as a tset
nI eht esac fo citamuenp htgnel gnirusaem -urtsni
standard.
,stnem eht siseretsyh fo eht derusaem eulav is
5.1.1 ehT gauging ,tnemele that is, eht ria gulp ro denimreted morf 5 stnemerusaem ni eht elddim fo
ria gnir is detset htiw a detarbilac gnitacidni eht gnirusaem .egnar ehT citemhtira naem eulav
.tnemurtsni shall ton deecxe eht seulav nevig ni elbaT 2.
5.2 evitalumuC rorrE fI sselehtreven eseht seulav era ,dedeexe eht
gnitacidni tnemurtsni shall eb deifirev htiw a tej
5.2.1 nI eht esac fo citamuenp stnemurtsni hcihw gnirusaem eborp ecnis this is a elbigilgen small
era desu htiw a lacinahcem tcatnoc ria eborp siseretsyh fo eht derusaem .eulav ehT ecnereffid
gauging tnemele ni a rennam ralimis ot dial neewteb eht siseretsyh fo eht derusaem eulav fo
seguag as rep SI 2092 : 1983, eht evitalumuc rorre eht citamuenp tnemurtsni and that fo eht gnitacidni
is denimreted yb gnivom gnirusaem pins ni steps tnemurtsni neht sevig eht siseretsyh fo eht
fo~ IO laes snoisivid rednu eht tcatnoe tniop starting derusaem eulav .rosnes
morf elddim fo eht egnar no htob sides.
5.2.2 nI eht esac fo citamuenp stnemurtsni using 5.5 Measuring Force and Hysteresis of the
all rehto sepyt fo gauging stnemele shall eb Measuring Force
dekcehc yb at tsael 3 gnittes standards. ehT sezis
nI eht esac fo lacinahcem tcatnoc
fo eht gnittes standards shall eb hcus that 2 fo gauging
stnemele eht gnirusaem ecrof and siseretsyh fo
meht eil nihtiw eht mumixam gnirusaem egnar
eht gnirusaem ecrof era derusaem revo eht elohw
timil and srehto era yllauqe detubirtsid revo eht
gnirusaem egnar yb gnivom eht gnittes standard
gnirusaem .egnar
.stniop sihT shall ton wohs seulav erom than
ehT devresbo seulav dluohs ton deecxe eht eulav deificeps ni elbaT 2.
Table 2 Range of Permissible Variations
( Clauses 4.2, 5.3, 5.4 and )5.5
Parameters egnaR of elbissimreP snoitairaV
_--_-_._A-_----r

tcatnoC-noN lacinahceM satnoC
gniguaG tnemelE gniguaG tnemelE
a) evitalumuC rorrE tuohtiw noitasnepmoc 1’5 vid 1’5 vid
)b evitalumuC rorrE htiw noitasnepmoc 1 vid 1 vid
)c ytilibataepeR 0’5 vid 0’5 vid
)d siseretsyH fo eht derusaem eulav 0’5 vid 0’5 vid
)e siseretsyH fo eht gnirusaem ecrof elbigilgeN 0’2 N
f ) mumixaM egnahc fo gnirusaem ecrof rof eht emas elbigilgeN 0’2 N
noitcerid fo tnemevom
2
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Act, 1986
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