# The Measuring Instruments Regulations 2016, Paragraph 3: Maximum permissible error


(1) Where a cold-water meter is used for trade within a flowrate range set out in column 1 of the following Table, it must operate within the maximum permissible error specified for that flowrate range set out in column 2 of that Table.
Column 1
Column 2
Flowrate range
Maximum permissible error as a percentage of quantity delivered
Q1 to ˂ Q2
± 6%
Q2 to and including Q4
± 2.5%
(2) For the purposes of that Table—
(a) “Q1” is the lowest flowrate at which the cold-water meter provides indications that satisfy the requirements concerning the maximum permissible errors;
(b) “Q2” is the flowrate value occurring between the permanent and minimum flowrates, at which the flowrate range is divided into two zones, the upper zone and the lower zone, each zone having a characteristic maximum permissible error;
(c) “Q3” is the permanent flowrate; and
(d) “Q4” is the highest flowrate at which the cold-water meter operates in a satisfactory manner.

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Source: https://www.legislation.gov.uk/uksi/2016/1153/schedule/6/paragraph/3 (the official version)
Page: https://openlegislation.uk/measuring-instruments-regulations-2016/schedule-6/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.