OHAUS 1200-00 User manual

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Instruction Manual
SCHOOL BALANCE
Models
1200-00,1200-50,
1210-00 and 1210-50
Ohaus CorporationOhaus Corporation
Ohaus CorporationOhaus Corporation
Ohaus Corporation
29 Hanover Road
Florham Park NJ
07932-0900

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INTRODUCTIONINTRODUCTION
INTRODUCTIONINTRODUCTION
INTRODUCTION
ThismanualcoversInstallationandOperationfortheOhausSchoolBalancesModels
1200-00, 1200-50, 1210-00 and 1210-50.
DESCRIPTIONDESCRIPTION
DESCRIPTIONDESCRIPTION
DESCRIPTION
Ohaus School balances are manufactured from die cast aluminum, are rugged and
easytouse. Thebalancesareintendedforuseinprimaryandintermediateeducation
applications. They are easy to zero, produce quick readings due to their damping
mechanism, have four corned pans for easy pouring and are designed for specific
gravitymeasurements. Capacityofthebalanceis2000gramswitha readability of0.5
grams. Thebalancewillreproducepreciselyforyearsbecauseofhardenedsteelknife
edges and steel bearings. Model 1200-00 comes equipped with an eight piece mass
set and Model 1210-00 is supplied with a four piece mass set. Models 1210-00 and
1210-50utilizeabeamwithaslidingpoisewhichintroducesthemeasurementconcept
commonly found on more advanced weighing instruments. Use of the sliding poise
eliminates the need for small masses which are easily misplaced. Models 1200-50
and 1210-50 are not equipped with a mass set.
Figure 1. Model 1200-00 With Eight Piece Mass Set.
Figure 1. Model 1210-00 With Four Piece Mass Set.

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UNPACKING AND SET-UPUNPACKING AND SET-UP
UNPACKING AND SET-UPUNPACKING AND SET-UP
UNPACKING AND SET-UP
Carefully remove the balance and pans from the carton. The corrugated shipping
inserts contain packages of push nuts and weights.
Place the balance on a reasonably flat and level surface with the color-coded,
removable pans on their matching platforms.
NOTENOTE
NOTENOTE
NOTE: If desired, the pans can be permanently attached to the platforms by means
ofthefour push nutsprovided,two for eachpan. Pressthem over diagonallyopposite
studs which will protrude from the bottoms of the pans through the holes in the
platforms.
ZEROING THE BALANCEZEROING THE BALANCE
ZEROING THE BALANCEZEROING THE BALANCE
ZEROING THE BALANCE
Before weighing and with no weight on the pans, the balance indicator should line up
with the center graduation on the recessed dial. If adjustment is necessary, rotate the
zero adjustment wheel located to the right of the dial, see Figure 2.
Figure 2. Zeroing the Balance, Model 1210-00 Shown.
Color coded, high impact polystyrene
pans,3.2cmdeepfor greater capacity
with easy pour corners.
Manual damping wire Zero adjust wheel for
loop for speedier correction of out-of-
weighings and teaching balance condition.
of damping principle.

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WEIGHINGWEIGHING
WEIGHINGWEIGHING
WEIGHING
On Models 1200-00 and 1200-50 after obtaining a zero balance, place the objects to
beweighedonthered(left-hand)pan. Thepointerwillswingtotheright. Placeweights
ontheyellow(right-hand)panuntilthepointeragainlinesupwiththecentergraduation
ontherecesseddial. Theweightoftheobjectisequaltothesumoftheweightsneeded
on the right-hand pan to center the pointer.
OnModels1210-00 and 1210-50, repeatabovestepand move thepoiseonthebeam
to the right until the pointer again lines up with the center graduation on the recessed
dial. The weight of the object is equal to the sum of the weights needed on the right-
hand pan plusplus
plusplus
plus the amount indicated on the beam.
Your OHAUS School Balance will weigh objects up to its capacity of 2000 grams with
a readability of 0.5 gram.
Models1200-00and1210-00includesametricmass(seeFigures3and4). Masssets
areavailableasanaccessoryforModels1200-50,1210-50andmaybeobtainedfrom
your local OHAUS dealer. See accessories section of this manual.
Figure 3. Metric Brass Weight Set for Model 1200-00.
Figure 4. Metric Brass Weight Set for Model 1210-00 .
Store conveniently along right side of balance base.
Inorder toutilize thefull capacityof either balance, additional weights and weightsets
are also available from you local OHAUS dealer.
The manual damping wire (see Figure 2) can be used to avoid excessive beam
oscillation during zero adjustment and weighing. Use a finger to slowly push the wire
looptowardsthecenterofthebalanceandthenreleasegentlywhenpointerhascome
to rest.

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SPECIFIC GRAVITY DETERMINATIONSSPECIFIC GRAVITY DETERMINATIONS
SPECIFIC GRAVITY DETERMINATIONSSPECIFIC GRAVITY DETERMINATIONS
SPECIFIC GRAVITY DETERMINATIONS
ThebalancecanbeelevatedforsuspendingspecimensinwaterbymeansofaClamp
and Rod Support (see Figure 5).
Figure 5. Specific Gravity Measurements.
Aspecimen can besuspended from theleft-hand platform bytying a stringaroundthe
bottom end of the platform support, underneath the base.
SOLIDS - (denser than water)SOLIDS - (denser than water)
SOLIDS - (denser than water)SOLIDS - (denser than water)
SOLIDS - (denser than water)
Todetermine specific gravityofsolids denser thanwater, the specimenshouldbe first
weighed in air and then weighed immersed in water.
S. G. = Weight in air
Weight in air minus weight in water
SOLIDS - (less dense than water)SOLIDS - (less dense than water)
SOLIDS - (less dense than water)SOLIDS - (less dense than water)
SOLIDS - (less dense than water)
To determine the specific gravity of solids less dense than water, it is necessary to
attach a sinker and then make the following weighings:
a. Weight of body in air
b. Combined weight of body in air plus sinker in water
c. Weight of both body and sinker in water
Specific Gravity = a
b-c
ACCESSORYCLAMP&RODSUP-
PORT Rod fits hole in base of bal-
ance and clamp fastens to table,
desk or bench.
Model 183 (not included)
Suspend specimen from left
hand platform for Specific
Gravity experiments.

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OHAUS
CARE AND MAINTENANCECARE AND MAINTENANCE
CARE AND MAINTENANCECARE AND MAINTENANCE
CARE AND MAINTENANCE
With reasonable care, your School Balance can be kept in good working order. Keep
it clean and do not drop it. Never apply oil or any lubricant to the pivots or bearings;
this will lower the accuracy of the balance.
Theremovablepansaremadeofimpactresistantmaterial. Incaseofdamageorloss,
replacement pans are available.
OPTIONAL ACCESSORIESOPTIONAL ACCESSORIES
OPTIONAL ACCESSORIESOPTIONAL ACCESSORIES
OPTIONAL ACCESSORIES
DESCRIPTION PART NO
Brass Mass Sets
Open Mass Block with 12 pieces, 500 g x 1 g 200-00
Open Mass Block with 13 pieces, 1000 g x 1 g 201-00
Plastic Case with 9 pieces, 100 g x 1g 211-11
Plastic Case with 10 pieces, 200 g x 1g 214-11
Plastic Case with 8 pieces, 50 g x 1g 241-03
Accessory Clamp and Rod Support, Model 183 183-00
REPLACEMENT PARTSREPLACEMENT PARTS
REPLACEMENT PARTSREPLACEMENT PARTS
REPLACEMENT PARTS
Pan (Red) 2743-00
Pan (Yellow) 2743-01
Push Nuts, (four required) 2711-00
Metric Brass Mass Set with 8 pieces 50 g x 1.0 g, Model 1200-00 51005-01
Metric Brass Mass Set with 4 pieces 50 g x 10 g, Model 1210-00 51005-02
SERVICE INFORMATIONSERVICE INFORMATION
SERVICE INFORMATIONSERVICE INFORMATION
SERVICE INFORMATION
For Service assistance in the United States, please call Ohaus Corporation toll-free
at [phone]. An Ohaus Product Service Specialist will be available to help you.

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LIMITED WARRANTYLIMITED WARRANTY
LIMITED WARRANTYLIMITED WARRANTY
LIMITED WARRANTY
Ohaus products are warranted against defects in materials and
workmanship from the date of delivery through the duration of the
warrantyperiod.DuringthewarrantyperiodOhauswillrepair,or,atits
option, replace any component(s) that proves to be defective at no
charge, provided that the product is returned, freight prepaid, to
Ohaus.
This warranty does not apply if the product has been damaged by
accidentormisuse,exposedtoradioactiveorcorrosivematerials,has
foreign material penetrating to the inside of the product, or as a result
of service or modification by other than Ohaus. In lieu of a properly
returnedwarrantyregistrationcard,thewarrantyperiodshallbeginon
the date of shipment to the authorized dealer. No other express or
implied warranty is given by Ohaus Corporation. Ohaus Corporation
shall not be liable for any consequential damages.
As warranty legislation differs from state to state and country to
country, please contact Ohaus or your local Ohaus dealer for further
details.

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Ohaus Corporation
29 Hanover Road,
Florham Park, NJ 07932, USA
Tel: [phone],
Fax: [phone]
With offices wordwide.
P/N 2734-04 R0898 © Ohaus Corporation 1996, 1998, all rights reserved.