GPI GL-332 User manual

Automatic Level
GL-332
INSTRUCTIONSFORUSE

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Contents
1. Technical Data............................................................................................02
2. Structure Focusing.....................................................................................03
3. Methodof Operation..................................................................................06
3.1Setting and Levelling................................................................................06
3.2Aiming and Fousing..................................................................................06
3.3Staff Reading............................................................................................07
4. Checkand Adjusting..................................................................................08
4.1Correcttheparallelismfor both circlebubbleand Verticalaxis...............08
4.2Checkand Adjusting for levelingof sightline oftelescope......................09
5. Service and Maintance...............................................................................10

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1. Technical Data
Standard deviationof 1KM
double-run levelling 2.5mm
2.0mm
1.5mm
1.5mm
Telescope Erect Erect Erect Erect
Magnification 20X 24X 28X 32X
Clear objective aperture 38mm 38mm 38mm 38mm
Fieldangle120'1 20'1 20'1 20'
Shortestfocusing distance 0.6m 0.6m 0.6m 0.6m
Multiplication factor 100 100 100 100
Additive constant0 0 0 0
Compensator working range ±15'±15'±15'±15'
Compensator setting accurancy
±0.8"±0.6"±0.5"±0.3"
Sensitivityof circular bubble8'/2mm
8'/2mm
8'/2mm
8'/2mm
Graduation interval11 1 1

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2.StructureFeatures
a. Thetelescopehassystemof erectinternalfocusing whichcanbeusedto obtain
reversedimagebywayofprism.It isofsealedtypetopreventfromdust,water
and steam.
b.Alltheoptical partsarecoatedwithtransmissiveand reflectivefilmsto reduceloss
in luminousenergy.
c.Haircross-spring suspensionprismisusedforthecompensator,andthelabyrinth
damperwillstopthecompensatorwithinshort time to raiseefficiency.
d.Theinstrument matchedwithwarningsetsoit canchecktheworking situationof
compensator andthepropertyofleveling.
e. Friction brakeand thestructureof wholecirclemicro-driveisusedfor instrument
horizontalmicro-motion,whichhastheadvantagesof reliablein structureand easy
in operation.
f. Instrument(Fig.1) and(Fig.2)

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Fig1
Focusing knob
Telescope
Objective
Endless horizontal
drive
Foot screw

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Fig2
Endless horizontal
drive
Foot screw
Bubble observer
Eyepiececover
Eyepiece
Adjusting screw
Graduation
Circularbubble

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3.Methodof Operation
3.1Settingand Levelling
a.Toadjusttripod,andlettheflatpartoftripod in alevelingposition,with itsheight
basicallyin the same line ofthetelescope andtheoperator'seyes.
b.Tosettheinstrument on tripod,andtoconnecttheinstrument tothetripod withthe
centralscrew.
c. Withthe help of levelingscrew. Centerthecircularbubbleexactlyattheposition.
3.2Aimingand Focusing
a. Torotateeyepiececover,observethroughtheeyepiece ofthetelescope,and letthe
sight distanceline ingraduatedscaleclear.
b.Toaimthestaff byrough finder,to rotatethefocusing handwheeluntil sight of
staff clear(forward to faraway,andbackwardtonearer),thentorotatethehand
wheelofendless horizontalmicro-motion and letthesight ofstaff on center.

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3.3Staff reading
a. Whentheinstrument aimingatthestaff,the
reading ofthecenterlineisthealtitude.(Fig.3)
is1.614m
b. Tohave the readingsrespectivelyforthe upper
lineand thelower,thedistancefromstation
point tothe staffwillbe（upperline
reading-lowerline reading）×100. (Fig.3)is
（1.675–1.550）×100 =12.5m
c.Whenthevertical hairinsight distance lines
aiming atobject A,theindicatinganglein dial
will be ∠AOB = α–β
Fig3
Fig4
0
A
B
a
b

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4.Checkingand adjusting
Beforeleavingthefactory,eachcenterlineisproperlyadjusted,thecenterlineis
properlyadjusted,thecenterlinesmaydeviatefromproperpositionafter
transportation orlongtimeoperation.Sotocheckandadjustthemain centerlines is
necessarybeforemeasuring and surveying isfield work.
4.1 Correcttheparallelismforboth circlebubbleand verticalaxistosetthe
instrument on tripod,andtorotateleveling screwsuntil bubbleiscentered.If to rotate
theinstrument on 180 ,thebubbleremainscentered,bubbleposition iscorrect,
otherwiseif mustbecorrectedin following way.
a.Torotatefootscrew,enablingbubbletomovecentered,andit'smovementwill
behalfdeviationfromthe totalvalue.
b.Toadjustthebubbleadjustingscrew,enablingbubbleto movecentered,andrepeat
until thebubble doesnot movealong with rotatingof theinstrument.

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4.2 Checkandadjusting forleveling ofsight
lineof telescope(Checkand adjusting angle)
selectachecklineabout45–60m on aeven
ground, divideiton 3partswith the same
length (Fig.5),staff onpointsB&C.Supposethemeanreading bytheinstrument at
point Aisa1,b1; and themeanreadingbytheinstrument atpoint Disa2,b2,if
=(a2,-b2) (a1-b1)≤±3mm theangleiswithintolerance,otherwisetheinstrument
mustbyreadjustedinthefollowing way:
a. Firstto calculate Δ= (a2,–b2)–(a1–b1) suppose a3=a2–Δ
b.Theinstrument remainedatpoint D,aimingatstaffB,toremovetheeyepiece
coveryouwillsee areticleadjusting screw(Fig.6),removetheadjusting screwon
gradudtedscale carefullywithadjusting needleuntilthegraduatedscalecenter
A
B
C
D
a
4
’
a
4
a
1
’
a
1
a
2
a
2
’
a
3
a
3
’
Fig5