Regulation 2 Interpretation

In these Regulations:—

• “the Act” means the Weights and Measures Act 1985;

• “differential pressure gauge” means an instrument used to determine the pressure loss across either a cold-water meter or a reference meter for water;

• “discrimination threshold” means the smallest change which produces a perceptible change in the indication;

• “linearity” means the horizontal band within which the graph of the meter error of a reference meter lies over the authorised range of flowrates;

• “multifiller” means a device consisting of a number of calibrated measures, capable of dispensing simultaneously known quantities of water, used for the testing of capacity measures;

• “piston prover” means a device which can deliver or accept water in quantities determined by the displacement of a piston in a cylinder;

• “proving tank” does not include a proving tank for water;

• “proving tank for water” means a local or working standard capacity measure which is used solely with water to test cold-water meters or reference meters for water;

• “reference meter” means a meter for use in testing measuring equipment used for the measurement of liquid fuel delivered from road tankers;

• “repeatability” means the ability of weighing or measuring equipment to indicate, under defined conditions of use, closely similar quantities on repeated measurings, expressed as a 95 per cent confidence interval;

• “suitable weighing machine” means a weighing machine having a discrimination threshold and a repeatability in grams not exceeding one fifth of the limit of error expressed in millilitres of the standard or equipment it is being used to test; and

• “95 per cent confidence interval” means the range of values within which the true value may be expected to lie with a 0.95 level of probability.

The abbreviations of, and symbols for, units of measurement used in these Regulations refer to the relevant units as follows:—