PART IIIUSE FOR TRADE OF COLD-WATER METERS
Requirements for use for trade14
No person shall use for trade a cold-water meter unless—
a
it is compliant with the essential requirements other than the provisions relating to maximum permissible errors referred to in paragraph 15 of Schedule 1;
b
it operates within the maximum permissible errors set out in regulation 15; and
c
the requirements of regulation 16 are complied with.
Maximum permissible error15
1
Where a cold-water meter is used for trade within a flowrate range set out in column 1 of the following Table, it shall operate within the maximum permissible error specified for that flowrate range set out in column 2 of that Table.
2
For the purposes of that Table, Q1, Q2 and Q4 have the meanings set out in paragraph 2 of Schedule 1.
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% |
Manner of use16
1
Where a cold-water meter is marked with—
a
a temperature range, it shall not be used for trade in temperatures outside that range;
b
a flowrate range, it shall not be used for trade at a flowrate outside that range.
2
Where a cold-water meter bears a mark which signifies the manner and purpose of use, it shall not be used for trade in a manner or for a purpose which does not accord with that marking.
3
A cold-water meter shall not be used for trade in circumstances—
a
in which it may be prevented from operating consistently or accurately; or
b
which are likely prematurely to degrade its metrological characteristics.
4
A cold-water meter shall not be used for trade unless, when adjusted, the calibration of the instrument is set as close to zero as is practicable.