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Marcy Scale & Digital SG Scale
The Marcy Pulp Density Scale correlates the specific gravity of the ore with the percentage solids of the pulp. This information is displayed on a circular scale for several specific gravities by use of a simple weigh scale. The simplicity of the scale along with its many applications have made the Marcy Pulp Density Scale a common feature at concentrators throughout the world.
Analytical Balance
These are most often found in a laboratory or places where extreme sensitivity is needed for the weighing of items. Analytical balances measure mass. Chemical analysis is always based upon mass so the results are not based on gravity at a specific location, which would affect the weight.
Equal Arm Balance/Trip Balance
This is the modern version of the ancient Egyptian scales. This type of laboratory scale incorporates two pans on opposite sides of a lever. This is convenient in applications such as balancing tubes or centrifugation where two objects must be the exact same weight.
Platform Scale
This form of scale is used for applications such as the weighing of drums or even the weighing of animals in a veterinary office.
Spring Balance
This type of balance utilizes Hooke's Law which states that the stress in the spring is proportional to the strain. An example of this type of balance would be the scale used in a grocery store to weigh produce.
Top-Loading Balance
This is another balance used primarily in a laboratory setting. They usually can measure objects weighing around 150–5000 g. They offer less readability than an analytical balance, but allow measurements to be made quickly. Top-loaders are also more economical than analytical balances. Modern top-loading balances are electric and give a digital readout in seconds.
Torsion Balance
Measurements are based on the amount of twisting of a wire or fiber. Many microbalances and ultra-microbalances, that weigh fractional gram values, are torsion balances. A common fiber type is quartz crystal.
Triple-Beam Balance
They are called triple-beam balances because they have three decades of weights that slide along individually calibrated scales. The three decades are usually in graduations of 100g, 10g and 1g. These scales offer much less readability but are adequate for many weighing applications.
Calibration
A scale cannot be accurate indefinitely; they must be rechecked for accuracy. There are weight sets available that allow users to calibrate the scale themselves or the scales can be calibrated by hiring a professional to calibrate them on site.
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