By S. V. Gupta
This e-book is written for scientists concerned about the calibration of viscometers. a close description for stepping up approaches to set up the viscosity scale and acquiring units of grasp viscometers is given within the e-book. Uncertainty issues for normal oils of identified viscosity are provided. the fashionable viscometers in accordance with rules of tuning fork, ultrasonic, PZT, plate waves, Love waves, micro-cantilever and vibration of optical fiber are mentioned to encourage the reader to extra study and to generate stronger models. the first average for viscosity is natural water. Measurements of its viscosity with accuracy/uncertainty accomplished are defined. the foundations of rotational and oscillation viscometers are defined to reinforce the information in calibration paintings. units used for particular fabrics and viscosity in non SI devices are mentioned with admire to the necessity to correlate viscosity values acquired via a variety of units. the outline of business viscometers meets the wishes of the user.
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Extra info for Viscometry for Liquids: Calibration of Viscometers
The water should conform to ISO 3606: 1987 ‘‘Water for analytical laboratory use- specifications and test methods’’. 2 Standard Oils Chemically stable oils are selected to cover the required viscosity range. These should be transparent and have vapour pressure \10 mm of Hg at 40 °C. The oils are stored away from the light preferably in glass bottles. 003 mm2/s2 is chosen and its viscometer constant is determined with the help of de-ionised distilled water at 20 °C. 01 °C. Two thermometers should be used to check any temperature variation.
1 Different Temperatures of Measurement and Statement The viscosity of all liquids is temperature dependent. Hence viscosity of a liquid is stated at a given standard temperature. The bath is maintained at the standard temperature however the actual bath temperature may still differ from the standard temperature. Hence a correction is applicable due to this cause. 78 °C respectively. 3. 2 Buoyancy Correction The buoyancy correction is applicable to both Cannon and Ubbelohde viscometers. In kinematic viscometers the driving head of the liquid is slightly reduced by the counter-poised head of air in the empty arm of the viscometer.
International organisation for Standardisation, Geneva 2. ASTM (2006) Standard Practice for Basic Calibration of Master Viscometers and Viscosity Oil Standards ASTM D2162-06 3. Gupta SV, Nangia SN, Sharma DC (1991) Establishment of viscosity scale. MAPAN-J Metrol Soc India 6:29–36 4. Fujita Y, Kurano Y, Fujii K (2009) Evaluation of uncertainty in viscosity measurements by capillary viscometers. Metrologia 46:237–248 Chapter 3 Capillary Viscometers Abstract Glass capillary viscometers may be categorised in three groups.
Viscometry for Liquids: Calibration of Viscometers by S. V. Gupta