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Chemical Balance

Chemical Balance

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Key Features of Modern Chemical Balances

  • Draft Shield: A glass housing surrounding the pan to prevent air currents from affecting the weight.
  • Sensitivity: Capable of detecting the mass of a single grain of chemical.
  • Automatic Tare: Allows the operator to zero the balance with a container on the pan.
  • Self-Diagnosis: Features for checking balance performance. 
Feature/Specification Description
Common UsesQuantitative chemical analysis, preparation of standard solutions, research and development.
Measurement Range (Capacity)Typically up to \(200\text{g} - 320\text{g}\).
Readability (Least Count)\(0.0001\text{g}\) (\(0.1\text{ mg}\)) is standard; \(0.00001\text{g}\) (\(0.01\text{ mg}\)) for semi-micro balances.
Accuracy (Linearity)\(\pm 0.2\text{ mg}\) or better.
ComponentsWeighing pan, draft shield (glass case), beam, agate bearings, pointer/digital display, leveling screws, and bubble level.
Stabilization TimeApproximately \(4 - 10\text{ seconds}\).
CalibrationUsually Automatic Internal Calibration (time/temperature controlled).
Display TypeBacklit LCD digital display.
Power SourceElectronic AC adapter.
Environmental ControlRequires a draft-free location and vibration-free bench.


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Component/Feature         Specification
Size/Scale Diameter6 inches (150 mm) or 7 inches (175 mm/178 mm)
Vernier Reading1 minute of arc (30 seconds also common)
Main Scale0-360° with divisions of (0.5  circ ) (150 mm or 175 mm circle)
Vernier ScaleDouble ended vernier separated by (180 circ )
Collimator LensAchromatic, 178 mm focus, 32 mm clear aperture
Telescope LensAchromatic, 178 mm focus, 32 mm clear aperture
EyepieceRamsden Type ((10 times ) or (15 times ) with cross-line graticule
SlitUnilaterally adjustable, 6mm long
Fine AdjustmentProvided for both telescope and collimator (laterally and vertically)
Prism TableMarked with lines; leveling screws & interchangeable clamp
Main StructureHeavy cast metal with bright plated fittings (sometimes stainless steel scale)
AccessoriesPrism holder, Grating holder, Watchmaker’s eyeglass, L-key, Hardwood case



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