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 Home > Scientech > Installing Balance
scientech balance

INSTALLATION
Scientech precision balances

When you select one of the Scientech line of balances, you're selecting "Power Under the Hood" that's unmatchable. 

If you need absolute accuracy for your weighing application, then make sure you buy a Scientech Balance.  When you're on a tight budget and need the most balance for the buck, Precision Weighing Balances is your deep discount distributor offering wholesale prices to the public.

The location of installation for a precision toploading or analytical balance is critical to achieve peak performance.


Points to consider include:

  • Always calibrate your balance when first installing the balance.  Plug in the balance for at least (1) hour to allow the circuitry proper warm-up time and then calibrate the balance.  Note, calibration masses are optional accessories and should be purchased when purchasing a balance

  • Set up the balance on a firm weighing table and even surface.  Turn the adjustable feet until the balance is level using the spirit level/bubble indicator as guidance.

  • Plug the AC adapter into a receptacle that is properly grounded.  In addition, ground the balance's chassis for electrostatic discharge to lessen the chance of static electricity contributing to inaccurate weight reading.

  • Avoid exposing the balance to vibrations during weighing.  Corners of rooms are usually less prone to vibrations.

  • Best operating temperature is about 20°C/68°F at about 50% relative humidity.  If you transfer the balance to a warmer area, make sure to condition the balance for about 2 hours at room temperature, leaving the unit unplugged from AC power.  This is because the moisture in the air can condense on the surfaces of a cold balance whenever it is brought into a substantially warmer place.  Never expose the balance to extreme moisture over long periods.

  • Protect the balance from drafts that come from open windows or doors.  Heat and air-conditioning ducts will also product draft resulting in unstable readings.

  • Use caution when using weigh containers made of plastic since plastic is more prone to holding a electrostatic charge.  If the samples being weighed hold static electricity an aftermarket static ionizer maybe needed for ionization for static removal.

    Static charges tend to develop when different materials rub against one another.  Some materials can pick up excess electrons, resulting in negative static charges while other materials give up electrons, resulting in a positive charge.  If the charged material is non-conducting (as are films, glass lenses and plastics), then the static charge remains.

  • Use caution when measuring magnetic materials.  Precision toploading and analytical balances designed with a force restoration motor as the weighing device uses strong magnet as part of the balance assembly.  If there is a problem, use the underhook option available on the bottom of most balances.  By suspending the material away from the balance magnet field influences can be lessened.  Also don't install the balance near equipment the generates magnetic fields.

  • For balances equipped with draft shield weighing a sample that is either hotter or cooler than the ambient temperature can result in erroneous readings.  The hot/colder sample being weighed can set up a draft in the chamber due to the air rising or falling next to the sample.

    Air in the closed environment such as a draft shield of a analytical balance is heated by the hot substance.  As a result of this transfer of heat, the particles in the air have a greater velocity.  At this point, Bernoulli's Principle must be considered.  Bernoulli stated that as the speed of a moving fluid increases, the pressure within the fluid decreases.  Thus, the warmed air exerts less pressure on the balance's platform than if it were at room temperature.  Since the balance is calibrated at room temperature, and the air is now exerting less pressure, the balance will measure the mass of the substance as slightly less than it actually is.

    Bernoulli's Principle is also the property that allows aircraft to fly.  The air above the wing moves faster than the air below the wing.  As a result, a pocket of low pressure is formed above the wing, and the wing and plane is pushed upward by the higher pressure below the wing.

  • Allow sufficient space around the balance for easy of operation and keep away from radiating heat sources.

We always recommend external calibration of all balances


 
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