Permissible influences of electromagnetic disturbances
This
adran has no associated
Memorandwm Esboniadol
28.—(1) The instrument shall not be influenced by static magnetic fields and by electromagnetic fields at mains frequency.
(2) The influence of an electromagnetic disturbance shall be such that the change in the measurement result is not greater than the critical change value as laid down in sub-paragraph (3) or the indication of the measurement result is such that it cannot be interpreted as a valid result.
(3) The critical change value for a complete heat meter is equal to the absolute value of the MPE applicable to that heat meter (see paragraph 27).