- Y Diweddaraf sydd Ar Gael (Diwygiedig)
- Pwynt Penodol mewn Amser (30/10/2006)
- Gwreiddiol (a wnaed Fel)
Version Superseded: 28/12/2016
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19.—(1) Electromagnetic immunity
(a)The effect of an electromagnetic disturbance on a water meter shall be such that—
(i)The change in the measurement result is no greater than the critical change value as defined in paragraph 19(1)(c), or
(ii)the indication of the measurement result is such that it cannot be interpreted as a valid result, such as a momentary variation that cannot be interpreted, memorised or transmitted as a measuring result.
(b)After undergoing an electromagnetic disturbance the water meter shall—
(i)recover to operate within MPE, and
(ii)have all measurement functions safeguarded, and
(iii)allow recovery of all measurement data present just before the disturbance.
(c)The critical change value is the smaller of the two following values—
(i)the volume corresponding to half of the magnitude of the MPE in the upper zone on the measured volume;
(ii)the volume corresponding to the MPE on the volume corresponding to one minute at flowrate Q3.
(2) Durability
(a)After an appropriate test, taking into account the period of time estimated by the manufacturer, has been performed, the following criteria shall be satisfied—
(i)The variation of the measurement result after the durability test, when compared with the initial measurement result, shall not exceed—
(aa)3 % of the metered volume between Q1included and Q2 excluded;
(bb)1.5 % of the metered volume between Q2 included and Q4 included.
(ii)The error of indication for the volume metered after the durability test shall not exceed—
(aa)± 6 % of the metered volume between Q1 included and Q2 excluded;
(bb)± 2.5 % of the metered volume between Q2 included and Q4 included for water meters intended to meter water with a temperature between 0.1°C and 30°C;
(cc)± 3.5 % of the metered volume between Q2 included and Q4 included for water meters intended to meter water with a temperature between 30°C and 90°C.
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