OHAUS 1200-00 Manual de usuario

Instruction Manual

SCHOOL BALANCE

Models

1200-00,1200-50,

1210-00 and 1210-50

Ohaus CorporationOhaus Corporation

Ohaus Corporation

29 Hanover Road

Florham Park NJ

07932-0900

INTRODUCTIONINTRODUCTION

INTRODUCTION

ThismanualcoversInstallationandOperationfortheOhausSchoolBalancesModels

1200-00, 1200-50, 1210-00 and 1210-50.

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.

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

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 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.

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.

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)

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)

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.

OHAUS

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 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 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 INFORMATION

For Service assistance in the United States, please call Ohaus Corporation toll-free

at (800) 526-0659. An Ohaus Product Service Specialist will be available to help you.

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.

Ohaus Corporation

29 Hanover Road,

Florham Park, NJ 07932, USA

Tel: (973) 377-9000,

Fax: (973) 593-0359

With offices wordwide.

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