OHAUS HARVARD TRIP BALANCE
Directions for Use and Maintenance
Please read this manual before unpacking, setting up, and using your balance.
Your new precision balance has been packed in a carton specifically designed to protect it during shipment.
Follow these instructions and your balance will be operational in just a few minutes.
Remove the balance from the carton.
Remove the two round rubber beam retainers from the balance. These should be saved if you anticipate any
future shipment of the balance.
Select a reasonably flat, level surface and move the beam poises (and the tare poise on appropriate models) all the way
to the left. This will result in the scale being very nearly at zero balance.
Zeroing the Balance
To balance the scale exactly at zero, adjust the knurled zero adjust knob which is located at the right end of the beam. It
is advisable to check the zero balance periodically because foreign material may accumulate on the platforms or the
beams. This can produce a slight change in the zero balance position. In addition, whenever the scale is moved the
zero balance must be rechecked. Any appreciable change in the inclination of the working surface will affect it.
The base of each balance is leveled on a surface plate at the factory and will rest evenly on any perfectly
flat surface. The balance may rock slightly if the working surface selected is not absolutely flat. This
should be eliminated by shimming under the base. Be sure to adjust the zero balance after leveling.
Once the zero balance has been checked, proceed as follows:
Place the unknown mass on the left hand platform.
Move the large poise on the lower beam to the right until it reaches the first notch which will cause the right hand
platform to drop.
Move the large poise back one notch, which will allow the right hand platform to rise again.
Move the small poise on the upper beam to the right until the scale is brought into balance.
To determine the weight of the unknown mass, add the amounts indicated on the two beams. The capacity of the
balance exceeds the beam capacity and additional weights are necessary to take advantage of the full capacity.
Ohaus recommends the Sto-A-Weigh® weight sets, part numbers 213-00 (1000 gram x 1 gram) or 277-00 (2 pound x
1/16 ounce) as applicable.
To weigh masses which exceed the beam capacity:
Place additional weights on the right hand platform to compensate for the excess weight of the unknown mass.