Ohaus 1500 Series HARVARD TRIP MECHANICAL BALANCES Manual - Manual (Page 5)

5
Specific Gravity Determination
A Clamp and Rod Support, Ohaus part number 183-00, is an accessory used to
elevate the Balance for suspending a specimen in water. The rod is inserted into
the 1/2 inch recess on the underside of the Base. By means of a fine wire or
thread, the specimen is attached to the Check Pin which connects the Platform
Loop to the Check Rod. The procedure for weighing a suspended specimen is
the same as that for weighing an unknown mass on the Platform.
CARE AND MAINTENANCE
The following practices will assure that your Balance will give you years of
satisfactory and trouble-free service.
When the Balance is not in use, remove any mass or weights from the Platforms.
Move one of the Poises from zero so that the Balance is not in equilibrium. This
will stop the Balance from oscillating and prevent unnecessary wear.
Use and store the Balance in places free of vibration. Never lubricate the scale
bearings. The Bearings in these Balances are high grade polished agate V-
blocks and the knife edges are hardened, precision-ground steel. This type of
Bearing works most efficiently when clean and dry.
Keep the Balance clean at all times, being particularly careful not to let dirt
accumulate in the vicinity of the Bearings. If the Bearings should become dirty, try
to clean them using an air syringe. The Model 106-00 Balance Cover is
recommended to keep the Balance clean when not in use.
Cleaning Magnet Faces
In general, most foreign matter may be easily removed by an air syringe. If the
Damper Vane still does not move freely, proceed as follows:
1. CAREFULLY turn the Balance on its side.
2. Remove the four (4) screws that mount the Magnet Case to the underside of
the Base.
3. Remove the Magnet Case.
4. Clean the Magnet faces by pressing a piece of adhesive-backed tape
against them.
5. Reinstall the Magnet Case.