UNPACKING
Your new precision balance was protected during
shipment by a specially designed carton. Carefully
remove the balance, the attachment weights (included
with some models) and the separately packaged
Poise (sliding weight) from the carton and place the
balance on a reasonably flat and level surface.
Remove the slit rubber washer, which is lodged un-
derneath the platform support, and the plain rubber
washer that is located above the pointer.
SET UP
Locate the bevel on the back of the center beam and
slide the separate Poise up into it. Tilt the Poise
over into place on the beam.
Place both sliding Poises and the Dial at their zero
positions.
Move the Tare Poise to the extreme left.
The Pointer should come to rest near the zero balance
position.
ZEROING
To obtain exact zero balance, adjust the Balance Com-
pensator (knurled knob) which is located at the left
end of the beam.
It is recommemded that the zero balance be checked peri-
odically to ensure accurate weight readings.
WEIGHING
When exact zero balance has been obtained, proceed as
follows:
1. Place the specimen in the center of the Platform.
2. Starting with the largest capacity beam (500 gram),
move the 500 gram Poise toward the right to the first
notch that causes the Pointer to drop, then move it back
one notch, which causes the Pointer to rise.
3. Repeat the above procedure with the 100 gram Poise.
4. Turn the Dial until the Pointer comes to rest at zero.
The weight of the specimen is the sum of the values of the
Poise positions, read directly from the Graduated Beams
and the position of the Dial.
OPTIONAL ATTACHMENT WEIGHTS
The total capacity of the balance when Attachment Weights
are suspended from the pivots is 2610 grams.
Without attachment weights, the capacity is 610 grams.
USE OF THE TARE
All models are equipped with a patented Tare Poise which
will counterbalance empty containers up to and including
225 grams.
To use the Tare Poise, slide it to a position of approximate
balance, and then rotate the Poise to obtain exact zero
balance.
The net weight of the contents of the container may then be
determined in the usual manner.
FEATURES
• CONVENIENT DIAL READING
Enables weighing to 0.1 gram without the need for an
added poise.
• TIERED BEAM VISIBILITY AND ZERO ADJUST
Combination provides high speed efficiency and reduces
errors.
• MAGNETIC DAMPING
Based on the principle of a permanent magnetic field re-
sisting the motion of the non-magnetic aluminum damper
vane. The damping force is proportional to the velocity
of the damper vane and reduces to zero when the vane
comes to rest.
Speeds up weighing by causing the beam to come to rest
quickly without affecting sensitivity or accuracy. The sys-
tem is permanent, self-regulating, frictionless and effec-
tive at all loads.
• TARE BEAM AND POISE
Simplifies repetitive weighings and chemical formulations
by eliminating the container weight from calculations.
• OPTIONAL ATTACHMENT WEIGHTS
store conveniently in the base when not in use.
CARE AND MAINTENANCE
keep the balance clean at all times. In general, most
foreign matter may be easily removed by using an air
syringe. A piece of adhesive-backed tape pressed
against the Magnet faces will keep them free from dirt.
SPECIFIC GRAVITY DETERMINATION
Ohaus Model 183 clamp and Rod Support is an acces-
sory which elevates the balance for suspending speci-
mens in water.
The rod is inserted into half inch (12.7 mm) diameter
recess on the underside of the base. The specimen is
attached to the check pin by means of a fine wire or
thread. The check pin connects the check rod assem-
bly to the platform loop under the base.
FORMULAS
• Solids denser than water.
First weigh the specimen in air and then weigh it im-
mersed in water.
Weight in air
Weight in air minus weight in water
SG=
• Solids less dense than water.
It is necessary to attach a sinker and then make the fol-
lowing weighings:
a . Weight of specimen in air
b . Combined weight of specimen in air plus sinker in
water.
c. weight of both specimen and sinker in water.
a
b - c
SG=