CALIBRATION PROCESS

Transperts’ Volumetric Glassware is currently supplied to various laboratories across India from high end research labs to high schools & colleges. We have a dedicated team working only on Class “A” Calibrations. Our calibration standards have been proved to be in close compliance with international specifications. This is because we strictly adhere to all the traceable international standards specified by associations like ASTM International, DIN ISO, &/or USP.


Our Calibration Lab is well-equipped with all the necessary precision tools & machinery required for conducting meticulous calibration of almost all ranges of Volumetric Glassware required in research and industrial laboratories. Only well-experienced lab technicians perform calibration studies which are further standardized to achieve most precise levels of repeatable measurements for all the volumetric products.

CALIBRATION OF VOLUMETRIC GLASSWARE:

Important Considerations

  • To avoid Systematic Errors in laboratory measurements, it is crucial that all the volumetric glassware is properly calibrated.
  • Volume, weight and delivery time at calibration temperature are common parameters for calibrations.
  • It is important to maintain constant temperature (25 +/- 2°C) during calibration and use calibrated weights.
  • The quality of the measurements obtained from these products depends heavily on the care taken while calibrating them.

Technical Criteria

  • Temperature: The volume occupied by a given mass of liquid varies with temperature, as does the volume of the device that holds the liquid. 20°C or 27°C have been chosen as the normal temperature for calibration of much volumetric glassware.
  • Co-efficient of Thermal Expansion: Glass is a fortunate choice for volumetric ware as it has a relatively small coefficient of thermal expansion. However, the thermal expansion of the contained liquid is frequently of importance. Dilute aqueous solutions have a coefficient of thermal expansion of about 0.025%/°C. A litre of water at 15°C will occupy 1.002L at 25°C. A correction for this expansion must frequently be applied during calibration procedures.
  • Parallax: Parallax is another source of error when using volumetric ware. A correction for this expansion must frequently be applied during calibration procedures. Frequently, graduation marks encircle the apparatus to aid in this.
  • Meniscus: Read lower level of meniscus for clear liquid readings and upper level for coloured solutions readings, keeping your eye level horizontal in line with the liquid level.