IS 5946: Meteorology - Whirling psychrometer

10 Pages·1992·1.1 MB·English

by  Bureau of Indian Standards

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timely dissemination of this information in an accurate manner to the public.
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IS 5946 (1992): Meteorology - Whirling psychrometer [PGD
21: Meteorological Instruments]
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“Knowledge is such a treasure which cannot be stolen”

IS 6495 : 1992

Indian Standard
METEOROLOGY - WHIRLING
PSYCHROMETER - SPECIFICATION
( First Revision -1
UDC 551.508.71

@ BIS 1992
BUREAU OF INDIAN STANDARDS
MANAK BHAJIAN, 9 BAHADUR SHAH ZAFAR MARC
NEW DELHI 110002
Price Group 2
December 1992
lacigoloroeteM stnemurtsnI lanoitceS ,eettimmoC ML 21
FOREWORD
sihT naidnI dradnatS ( tsriF noisiveR ) was detpoda yb eht uaeruB fo naidnI Standards, retfa
eht tfard dezilanif yb eht lacigoloroeteM stnemurtsnI lanoitceS eettimmoC had neeb devorppa
by the thgiL lacinahceM noisiviD .licnuoC
ehT etarucca tnemerusaem fo cirehpsomta ytidimuh is fo taerg ecnatropmi ni lacigoloroetem
.ecitcarp ehT tsom nommoc dohtem fo gnirusaem ytidimuh is yb eht esu fo a retemorhcysp
hcihw stsisnoc yllaitnesse fo owt ralimis sretemomreht desopxe edis yb ,edis eno fo hcihw is an
yranidro retemomreht nwonk as eht blub-yrd retemomreht and eht rehto htiw its blub derevoc
htiw a eceip fo niht tew lairetam dellac eht blub-tew .retemomreht ehT erutarepmet detacidni
yb eht tew blub is yllareneg rewol than that fo eht yrd blub esuaceb fo noitaropave fo retaw
morf eht tew .blub ehT ytidimuh fo eht ria is detaluclac morf eht sgnidaer fo eht yrd and tew
blub ,sretemomreht using etairporppa cirtemorhcysp .selbat
ehT sretemorhcysp era rehtie fo eht yranoitats neercs epyt ro fo eht elbatrop gnilrihw .epyt
ehT rettal era erom etarucca ecnis eht noisserped ehtfo tew blub gnidaer woleb eht yrd blub
gnidaer sdneped no eht deeps fo eht ria past eht bulbs nehw eht wind deeps is .wol nT eht
gnilrihw ,retemorhcysp that deriuqer wolf fo ria past eht bulbs is dedivorp~ yb gnilrihw eh~t
retemorhcysp yldipar yb hand at eht etar fo tuoba 3 ot 4 s/ver ot nevig an ria deeps fo at tsael
4 m/s past eht bulbs.
sihT standard was yllanigiro dehsilbup ni 1970. sihT noisiver is desab no rehtruf ecneirepxe
deniag ni eht erutcafunam fo lacigoloroetem stnemurtsni and rehto tnempoleved ni this .dleif
Main snoitacifidom- :era
)a dedluoM citsalp emarf rof gnilrihw retemorhcysp has neeb .detaroprocni
)b nI weiv fo )a( evoba 3.1, 3.2, 5.1 and 8.1 evah neeb .deifidom
nI eht noitalumrof fo this standard, eud noitaredisnoc has neeb nevig ot eht stnemeriuqer laid
nwod yb eht dlroW lacigoloroeteM ,noitazinagrO .aveneG
roF eht esoprup fo gnidiced rehtehw a ralucitrap tnemeriuqer fo this standard is deilpmoc ,htiw
eht lanif ,eulav devresbo ro ,detaluclac gnisserpxe eht tluser fo a tset ro ,sisylana shall eb
dednuor ffo ni ecnadrocca htiw SI 2 : 1960 seluR‘ rof gnidnuor ffo laciremun seulav ( revised )‘.
ehT rebmun fo tnacifingis secalp deniater ni eht dednuor ffo eulav dluohs eb eht emas as that
fo eht deificeps eulav ni this standard.
SI 6495 : 1992
Indian Standard
METEOROLOGY - WHIRLING
PSYCHROMETER - SPECIFICATION
( First Revision )
1 EPOCS nwod at an elgna fo tuoba 15” ot eht -iroh
.latnoz A eldnah~ dexif at thgir selgna ot eht
1.1 sihT standard seificeps eht stnemeriuqer
emarf is osla dettimrep ( CES .giF 3 .) ehT
rof gnilrihw retemorhcysp rof gnirusaem ria
sretemomreht shall eb dexif ni eht emarf and
erutarepmet and cirehpsomta .ytidimuh
dleh ni noitisop yb elbatius gnikcap lairetam
woleb eht latem .emarf
2 SECNEREFER
5.1.1 ehT nedoow emarf shall eb ylenif dehsilop
SI 6017 : 1971 retemomrehT‘ rof gnilrihw
and nevig owt staoc fo raelc esolullec .reuqcal
’sretemorhcysp is a yrassecen tcnujda ot this
llA eht latem parts shall eb muimorhc detalp
standard.
and .dehsilop
3 NOITPIRCSED 5.2 sretemomrehT
3.1 ehT sretemomreht era detnuom edis yb edis ehT sretemomreht rof esu htiw gnilrihw
ni a nedoow emarf ro a dedluom citsalp emarf retemorhcysp shall mrofnoc ot SI 6017 : 1971.
dedivorp htiw a .eldnah ehT eldnah is dexif
ot eht emarf is hcus a rennam that eht -urtsni 5.3 nottoC cirbaF and daerhT
tnem yam eb detator ylhtooms at tuoba 3 ot
ehT eveels rof eht tew blub shall eb rehtie
4 s/ver ot evah an ria deeps fo at tsael 4 m/s
nevow lacirdnilyc nottoc eveels ro nwes morf
past eht bulbs.
yrev ylesolc nevow nottoc cirbaf gnivael as
3.2 enO fo eht sretemomreht has its blub elttil ni eht maes as .elbissop tI shall eb a
derevoc htiw a elgnis reyal fo niht nottoc thgit tif nehw deppils revo eht ,blub and eht
cirbaf hcihw has ot eb dettew htiw dellitsid pot and eht rewol sdne shall eb deit evoba and
retaw just erofeb an noitavresbo is .edam nI woleb eht blub htiw .daerht htoB eht cirbaf
eht dedluom citsalp emarf a small retaw nac is and eht daerht shall eb naelc and retaw
dedivorp ( ees .giP 3 ) and eht nottoc gniveels .tnebrosba
dips ni eht retaw ni eht nac ybereht syawla
gnipeek ti .tsiom 6 PIHSNAMKROW AND HSINI-F
6.1 ehT sretemomreht shall eb os dettif that
4 SNOISNEMID
eht owt bulbs era lacirtemmys ni eht stols fo
4.1 ehT snoisnemid fo eht gnilrihw -orhcysp eht .emarf ehT sertnec fo eht bulbs shall eb

retem shall eb as nevig ni .giF 1, 2 and 3. yletamixorppa ni eht sertnec fo eht .stols
6.2 llA eht gnivom parts fo eht retemorhcysp
4.1.1
Tolerances
shall tif ylhtooms and eht eldnah os depahs that
Tolerance ro snoisnemid UP to and gnidulcni eht tnemurtsni yam eb yltneinevnoc detator at
30 mm shall eb f 1 mm and no snoisnemid eht eriuqer .deeps
evoba 30 mm shall eb ~t2 .mm
7 GNITSET AND NOITCEPSNI
5 LARENEG STNEMERIUQER
7.1 llA eht sretemorhcysp gnignoleb ot eht
5.1 emarF emas tnemngisnoc shall etutitsnoc a .tol
ehT retemorhcysp emarf shall eb edam fo tfos 7.2 llA eht sretemomreht shall ebA detset
doow ro dedluom citsalp hcus as enedilynivylop yIlaudividni rof all eht stnemeriuqer debircserp
edirolhc ro lynivylop edirolhc and eht eldnah ni SI 6017 : 1971.
fo doow ro yna rehto elbatius lairetam ( ees
.giF 1 and 2 .) tI shall eb os depahs as ot evig 7.3 At tsael evif tnecrep seceip fo eht tol shall
a doog pirg and shall eb os dexif that nehw eht eb detset rof ytimrofnoc ot all eht stnemeriuqer
eldnips is dleh ,yllacitrev eht emarf sepols laid nwod ni 4.5 and 6.
1
IS 5946 : 1992
8 GNIKRAM 9 GNIKCAP
8.1 ehT retemorhcysp shall eb dekram no eht 9.1 ehT etelpmoc retemorhcysp shalI eb
emarf htiw eht laires ,rebmun raey fo -unam depparw ni a niht detagurroc ,repap and dekcap
,erutcaf and s’rerutcafunam eman initials ro ni a elbatius draobdrac notrac ro as deerga ot
.kram-edart neewteb eht resahcrup and eht .reilppus
LWOCOEN .FRAME
(CHROMIUM PLATED)
-3 WOODEN HANDLE
A-A

sretteL 'D' and 'W' ot-era eb devargne and dellif ni kcalB .ruoloC
A!1 snoisnemid ni .sertemillim
1
FIG. DIMENSIONS OF WHIRLING PSYCFIROMETER
2
SI 6495 : 1992
FIG. 2 DIMESSIONS OF WHIRLING PSYCHROMETERW ITH HANDLE FIXED AT RIGHT ANGLF

I
32
PLAZTP
HANDLE
M S SPINDLE
0 20
ClRCLl~
6
A-A
WATER CONTAINER
Ail snoisnemid ni .sertemillim
PIG. 3 DIMENSIONS OF WHIRLING PSYCHROMETERW ITH PLASTIC FRAME FIXED AT RIGHT ANGLE

3
I
1
Standard Mark
ehT esu fo eht dradnatS Mark is denrevog yb eht snoisivorp fo eht Bureau of Indian
Standards Act, 2986 and eht seluR and snoitalugeR edam .rednuereht ehT dradnatS Mark
no stcudorp derevoc yb an naidnI dradnatS syevnoc eht ecnarussa that yeht evah neeb
decudorp ot ylpmoc htiw eht stnemeriuqer fo that standard rednu a llew denifed metsys
fo ,noitcepsni gnitset and ytilauq lortnoc hcihw is desived and desivrepus yb SIB and
detarepo yb eht .recudorp dradnatS dekram stcudorp era osla ylsuounitnoc dekcehc yb
SIB rof ytimrofnoc ot that standard as a rehtruf .draugefas sliateD fo snoitidnoc rednu
hcihw a ecnecil rof eht esu fo eht dradnatS Mark yam eb detnarg ot srerutcafunam ro
srecudorp yam eb deniatbo morf eht uaeruB fo naidnI Standards.
Bureau of Indian Standards
BIS is a yrotutats noituti~tsni dehsilbatse rednu eht Bureau of Indian Standards Act, 1986 to
etomorp suoinomrah tnempoleved fo eht seitivitca fo ,noitazidradnats gnikram and ytilauq
noitacifitrec fo sdoog and gnidnetta ot detcennoc srettam ni eht .yrtnuoc
thgirypoC
SIB has eht thgirypoc fo all its .snoitacilbup oN trap fo eseht snoitacilbup yam eb decudorper
ni yna mrof tuohtiw eht roirp noissimrep ni gnitirw fo .SIB sihT seod ton edulcerp eht eerf ,esu
ni eht esruoc fo gnitnemelpmi eht standard, fo yrassecen ,sliated hcus as slobmys and ,sezis epyt
ro edarg .snoitangised seiriuqnE gnitaler ot thgirypoc eb desserdda ot eht rotceriD
( snoitacilbuP ,) .SIB
Revision of Indian Standards
naidnI Standards era deweiver yllacidoirep and ,desiver nehw yrassecen and ,stnemdnema fi
,yna era issued morf emit ot .emit sresU fo naidnI Standards dluohs niatrecsa that yeht era ni
noissessop fo eht tsetal stnemdnema ro .noitide stnemmoC no this naidnI dradnatS yam eb
tnes ot SIB gnivig eht gniwollof :ecnerefer
toD : .oN ML 21 ( 0061 )
Amendments Issued Since Publication
dnemA .oN etaD fo eussI txeT detceffA
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