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Field inspection manual—volumetric measuring devices

Specialised test procedures—procedure for testing static volumetric measures used in trade

Application

Any static volumetric measure that is used in trade.

Purpose

To assess whether static volumetric measures can deliver nominal quantities within applicable limits of error.

Equipment

Appropriate test measures, slicker plates, glass graduates and pipette.

Legislative references

R.100, R.101, R.102 and R.93.

Procedure

Sensitivity determination

Fill the measure with water to its nominal capacity.

Using a pipette, remove a quantity equal to the in-service limit of error. A certified and appropriate glass graduated standard must be used.

Carefully measure the distance from the liquid surface to the nominal capacity mark. The liquid level must lower by a distance not less than 2.4 mm (opaque) or 1.2 mm (transparent).

Testing "to contain"

Note: Some static measures used in trade are designed to measure on a "to contain" basis, usually to the brim of the container. This test ensures an accurate determination of the nominal volume.

Use a slicker plate standard with the same nominal capacity as the measure to be tested, and a smaller graduate to measure any excess water.

Make sure that the trade measure is dry and test standard has been wet and drained. See standard certificate of calibration.

Remove any water adhering to the outside of the test standard (trade measure should be dry).

Fill the standard with water until a meniscus is formed above its edge.

Strike the edge with a slicker plate, and remove any water adhering to the outside.

Carefully transfer the water from the standard to the trade measure until it is all transferred, or until the nominal capacity is reached, whichever comes first.

Note: If the water in the standard exceeds the capacity of the measure, transfer the remaining water to a graduated standard of appropriate size.

Drain the standard for the appropriate length of time.

If the water from the standard does not fill the measure, the amount required to bring it to its nominal capacity represents an error of under-indication of the measure.

Excess water remaining in the standard after the measure is full represents an error of over-indication of the measure.

Testing "to deliver"

Note: All static measures used for liquids will be tested to measure on a "to deliver" basis, unless marked otherwise. Volumetric provers and laboratory standards are generally calibrated to deliver. This test ensures an accurate determination of the nominal volume.

Wet and drain the trade measure and test standard.

Remove any water adhering to the outside of the containers.

Fill the trade measure with water to its marked nominal capacity, and again remove any water adhering to the outside.

Carefully transfer the water from the trade measure to the test standard, until it is all transferred, or until the nominal capacity is reached, whichever comes first.

If the water in the measure exceeds the capacity of the test standard, transfer the remaining water to a graduated standard of appropriate size.

If the water from the measure does not fill the standard, and if there are no graduations at that point, add pre-measured amounts of water to determine the difference.

Drain the trade measure for the appropriate amount of time.

Measured excess water represents an error of over-delivery from the measure.

The measured volume of water required to fill the standard to the nominal capacity represents an error of under-delivery from the measure.

Interpretation of results

Any measurement error must be within the tolerances prescribed by R.99 or R.100 of the Weights and Measures Regulations as applicable.

Revision 1

Device type 91.20 was added to the list of device types identified in the title line.

Revision 2

Device type 91.20 was changed to device type 92.10 to accommodate the implementation of the online reporting application.

Date modified: