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Division 3.1.1 The effect of an electromagnetic disturbance on a gas meter or volume conversion device shall be such that:

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  • the change in the measurement result is no greater than the critical change value as defined in point 3.1.3, or

  • 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.