Specifications

11
The below balance weighing apparatus shown previously is ideal for determining specific gravity. Specific gravity is the ratio of
the mass of a body to the mass of an equal volume of water. Every mineral has its own specific gravity (SG). A list may be
found in any Handbook of Chemistry and Physics. Specific gravity will classify or authenticate a substance. For instance, a
diamond’s SG is 3.50-3.53 while quartz’s is 2.65.
To determine specific gravity using our balance:
1. Install a below balance weighing hangar as shown in the previous section.
2. Install a below balance weighing apparatus, such as a wire hook, including a pan suspended in a bowl of water. Insure that
the pan and the hanger do not touch any part of the bowl and all are totally submerged. Then tare the balance.
3. Then place the sample to be tested on the balance pan and record the weight reading shown on the display. You may use
any unit of measure you desire.
4. Then place the same sample to be tested on the pan suspended in the bowl of water. Make sure that the sample is
completely submerged in the water and record the weight reading shown on the display.
5. Subtract the reading in Step 4 from the reading in Step 3.
6. Divide the reading in Step 3 by the number calculated in Step 5. The result is the SG of your sample.
EXAMPLE: Reading in Step 3 = 6.50
Reading in Step 4 = 4.25
Subtraction = 2.25
Division (Step 6) = 6.50/2.25= 2.89 specific gravity
DENSITY DETERMINATION
Scientech does not offer a density determination kit nor do you need one to determine density. Density is mass (grams) per unit
volume (cubic centimeters).
In order to determine density of a solid, place a graduated flask with a known volume of water on the pan of the balance, tare the
balance, and then place the solid in the flask of water. Divide the displayed weight in grams by the increased volume of water.
The result is the mass per unit volume of the solid in g/cc.
To determine the density of a liquid, place an empty graduated flask on the balance weighing pan, tare the balance, then pour the
liquid into the graduated flask. Divide the displayed weight in grams by the volume of the liquid. The result is the mass per unit
volume of the liquid in g/cc.
SECURITY BRACKET
A security bracket is provided on the rear panel. If needed, the bracket slides out of the rear of the balance providing a
convenient method of securing the balance.
OPTIONS
The Data Input Keyboard (9000-50), Motorized Internal Calibration Weight (9000-INT), Remote Foot Send or Tare Switch
(8000-FS), Remote Weighing (7000-04), and Custom Unit of Measure (9000-90) options must be installed at the factory or by
personnel authorized by Scientech. Other options, such as Scientech small printers, may be purchased at any time. Please
contact Scientech at [phone] or [phone] or email us at [e-mail] for information.
OPTIONAL DATA INPUT KEYBOARD
Figure 7 Optional Data Input Keyboard
NOTE: With the keyboard attached to the balance, the RS-232 communication is limited to balance sending only.
All incoming RS-232 command strings are ignored by the balance. Unplugging the keyboard and