Ohaus HJ2001 HARVARD JUNIOR MECHANICAL BALANCE Manual - Manual

Ohaus Harvard Junior Balance
Model HJ200 1
- OPERATING MANUAL -
INTRODUCTION
This manual covers Installation, Operation and Maintenance for the Ohaus Harvard Junior Balance. To ensure proper
operation of the Balance, please read this manual completely.
DESCRIPTION
The Ohaus Harvard Junior Balance is a precision weighing instrument, designed to provide years of service with virtually
no maintenance. The Harvard Junior Balance employs a two-pan design, with the added advantage that it comes
standard with two styles of weighing platforms as well as a set of weights.
Two-pan Balances of this type are commonly used for comparative weighing to determine the difference in mass between
two objects rather than their absolute value. Maximum Balance capacity for the Harvard Junior is 2kg/5.0lbs. Both the
Platforms and the bowls used on the Balance are 6" diameter.
UNPACKING
Harvard Junior Balances are shipped as follows:
• Completely assembled Balance
• Instruction manual & activity guide
• Two 6” diameter bowls
• Weight set
• Warranty Card
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 by pulling on the Styrofoam inserts.
•
Remove the weight set from the end of the Styrofoam insert.
•
Remove the inserts from Balance.
•
Remove the manual, activity guide and warranty card from the carton.
• Verify that all items have been included in you package.
• All loose packing material should be retained if you anticipate any future shipment of the Balance.
BALANCE SETUP
Place the Balance on a reasonably flat, level surface away from sources of vibration and drafts. Carefully remove the two
red round rubber washers from between the Base and Platform End Loops. The washers have been designed to remain
with the balance and should be reinserted any time the balance is relocated or stored.
Place the two Bowls on the matching color coded platforms. This will result in the Balance being very nearly at zero.
OPERATION
Zeroing the Balance
Setting the balance exactly at zero can be accomplished in using two different devices.
• If there is only a small adjustment required you can adjust the knurled Zero Adjust Knob which is located at the
right end of the Beam.
• If the out of balance condition exceeds the adjustment capacity of the knurled Zero Adjust Knob located at the
right end of the beam, use the larger Zero Adjust feature located on the rear of the beam by sliding the knob to
the approximate location to balance out the beam then use the fine adjust feature by rotating the zero adjust knob
to get an exact zero.
It is advisable to check the zero balance periodically because foreign material may accumulate on the Platform or the
Beam. This can produce a slight change in the zero balance position. In addition, whenever the Balance is moved, the
zero balance must be rechecked. Any appreciable change in the inclination of the working surface will affect accuracy.
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 is not absolutely flat. This should be eliminated by shimming under the
base to eliminate the rocking.