Translation of "Dispositif mesureur " (French → English) :

279. The air or vapour eliminator installed with a meter shall minimize the passage of air or vapour through the measuring element of the meter when the supply of liquid is exhausted or appropriate means shall be provided to automatically stop the flow of liquid or to indicate to the person using the meter that air or vapour is passing through the meter.

(g) pumps incorporating measuring devices, of heading No ; weight-operated counting and checking machinery, or separately presented weights for balances (heading No ); lifting or handling machinery (heading Nos to ); paper or paperboard cutting machines of all kinds (heading No ); fittings for adjusting work or tools on machine-tools, of heading No , including fittings with optical devices for reading the scale (for example, "optical" dividing heads) but not those which are in themselves essentially optical instruments (for example, alignment telescopes); calculating machines (heading No ); valves and other appliances (heading No ) ...[+++];

(f) Pumps incorporating measuring devices, of heading No 84.13 ; weight-operated counting and checking machinery, or separately presented weights for balances (heading No 84.23) ; lifting or handling machinery (heading Nos 84.25 to 84.28) ; paper or paperboard cutting machines of all kinds (heading No 84.41) ; fittings for adjusting work or tools on machine-tools, of heading No 84.66, including fittings with optical devices for reading the scale (for example, "optical" dividing heads) but not those which are in themselves essentially optical instruments (for example, alignment telescopes) ; calculating machines (heading No 84.70) ; ...[+++] valves and other appliances (heading No 84.81);

A supplementary device (star, disc with a reference mark, etc.) may be added in order to show the movement of the measuring device before this becomes clearly visible on the indicator.

1.2". Cyclic volume" means the volume of liquid corresponding to the operating cycle of the measuring device, that is to say to the whole of the movements at the end of which all the internal moving parts of the measuring device return, for the first time, to their original position.

2.3. The drive between the indicating mechanism and the measuring device must be reliable, durable and effected by means of a mechanical connection or by a permanent magnet device.