Copyright © 2003 Scientech, Inc.

 

 


BALANCE NOTE
SPECIFIC GRAVITY DETERMINATION

Scientech's below balance weighing appartus 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 appartus, 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 of water. 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 the third power.

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 to the third power.

OPTIONS

The Optional PDA Software, 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 be personnel authorized by Scientech. Other options, such as Scientech small printers, may be purchased at any time Please contact Scientech at (303) 444-1361 or (800) 525-0522 or email us at inst@scientech-inc.com for information.

OPTIONAL PDA Software

Scientech is introducing our newest balance accessory called our PDA Software. This handy accessory is a Palm PDA programmed with Scientech's customized software. This software allows you to plug and play the PDA into the RS232 port on any of our models. You will have access to all the standard features of the Palm, as well as our customized software, which will do the following special applications:

Total remote control of the balance
Remote weighing
Remote taring
Remote time averaging weighing used in live animal weighing and severe vibration environments
Remote ability to change to any unit of measure desired including basis weight measurements
Program the custom unit of measure feature to the unit of measure desired
Set balance time and date
Enable/disable a time and date stamp with each weight reading
Set an automatic time period that the balance sends the reading to the Palm
Remote parts counting either by placing a known number of parts on the pan or by entering part unit weight
Remote process control (check weighing) by either placing the high or low limits on the pan or by entering the numbers
GLP weighing report (both normal and automatic) with:

Balance model
Balance serial number
Lot ID input
Date/time
Sample number and weight of each weighing
Total weight
Min weight
Max weight
Mean weight
Number of weighings
Standard deviation
Coefficient of variation
Signature line
Date/time
ISO calibration compliance
report with:
Balance model
Balance serial number
Date/time
Manually keyed in target weight
Actual weight
Difference
Signature line
Date/time
Calculate statistics on any number of samples
Other menu with virtual keyboard for special functions such as:
Access 50 memory storage registers on the balance
Subtract container weights
Calibration to a standard weight
Weighing in percent
Percent moisture loss
Percent solids
Compounding
Compounding in percent
Ability to save all readings and reports
Print buffer
Print readings and reports saved on Palm to printer
Transfer readings and reports to a computer file


Analytical balances, balances, top loading balances, electronic balances, precision balances, scales, gem scales, jewelry scales, laser power meters, laser energy meters, calorimeters, pyroelectric detectors, photodiode detectors, and laser power and energy systems are the products offered by Scientech.
Laser Power Meter Notes

For more information, click on one of the following:


Scientech, Inc. 5649 Arapahoe Avenue, Boulder, Colorado 80303
Phone: (303) 444-1361 1-800-525-0522
Fax: (303) 444-9229 Email: inst@scientech-inc.com

Features Accesories SG Series SL Series SP Series SA Series Laser Power Meter Notes Balance Notes