Ohaus TRIPLE BEAM MECHANICAL BALANCES 1600 Series Manual - Manual (Page 2)

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 under-
neath 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
resisting 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 system is permanent, self-regulating, frictionless
and effective 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
accessory which elevates the balance for suspending
specimens 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
assembly to the platform loop under the base.
FORMULAS
• Solids denser than water.
First weigh the specimen in air and then weigh it
immersed in water.
. Weight in air .
Weight in air minus weight in water
• Solids less dense than water.
It is necessary to attach a sinker and then make the
following 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=
SG=