1441

Services

Mass

The calibration entails a weight comparison from the scale readout against a known standard or mass value. The precision mass standards used for calibration are of a known accuracy.


Mass Standard

Calibration using the double or single substitution method as appropriate or Calibration using othagonal design by subdivision.

  • Mass Pieces/weights < 100kg

Calibration using the single substitution method.

  • Mass Pieces/weights < 1000kg

Weighing instruments

Evaluation of linearity, eccentricity and repeatability using standard weights.

  • Digital Self-indicating
  • Mechanical Self-indicating
  • Weighing Instruments
  • Comparators
  • Semi Self-indicating

Volume

As was noted above, volumetric glassware is calibrated by measuring the mass of water that is contained- in or delivered-by the device. This mass data is then converted to volume data using the tabulated density of water (See Appendix) at the temperature of calibration.


Volume Dispensers

Calibration by the gravimetric method using distilled water.

  • Piston Pipettes < 100 Microliters
  • Syringes
  • Piston Pipettes > 100 Microliters

Laboratory Glassware

Calibration by the gravimetric method using distilled or potable water.

  • Automated Pipettes
  • Pipettes & Burettes
  • Flasks, Measuring Cylinders and Pycnometers
  • Volume Dispensers

Simple Measures other than Glass

Calibration by the gravimetric method using distilled or potable water.

  • Flasks, Measuring Cylinders and Pycnometers

Metal Measures

Calibration by the gravimetric method or using potable water.

  • Metal Strike Measures
  • Other Metal Standard Measures

Density

To find the density of any object, you need to know the Mass (grams) of the object, and its Volume (measured in mL or cm³). Divide the mass by the volume in order to get an object's Density.


Density of Solid

Calibration by immersion in water.

  • Solid Density Artefact

Density of Liquid

Determined gravimetically using pyknometer method. The cuckow method by partial submersion in liquid.

  • Liquid Density
  • Density Measuring Device (Hydrometer)