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2. In this Schedule—
“climatic environments” means the conditions in which cold-water meters may be used;
“critical change value” means the value at which the change in the measurement result is considered undesirable;
“disturbance” means an influence quantity having a value within the limits specified in the appropriate requirement but outside the specified rated operating conditions of the instrument. An influence quantity is a disturbance if for that influence quantity the rated operating conditions are not specified;
“influence quantity” means a quantity that is not the measurand but that affects the result of measurement;
“measurand” means the particular quantity subject to measurement;
“minimum flowrate” means the lowest flowrate at which the cold-water meter provides indications that satisfy the requirements concerning the maximum permissible errors (MPEs);
“overload flowrate” means the highest flowrate at which the cold-water meter operates in a satisfactory manner for a short period of time without deteriorating;
“permanent flowrate” means the highest flowrate at which the cold-water meter operates in a satisfactory manner under normal conditions of use, that is, under steady or intermittent flow conditions;
“Q1” means the minimum flowrate;
“Q2” means the transitional flowrate;
“Q3” means the permanent flowrate;
“Q4” means the overload flowrate;
“rated operating conditions” means the values for the measurand and influence quantities making up the normal working conditions of an instrument;
“transitional flowrate” means 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 has a characteristic MPE; and
“utility” means a supplier of cold water.
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