Kahesuunalise gaasivoo korral tuleb gaasiarvesti korpusel oleva pluss- ja miinusmärgiga kahe otsaga noolega näidata, millist voosuunda peetakse vastavalt positiivseks ja millist negatiivseks.
In the case of bi-directional flow a double-headed arrow with a plus and minus sign shall be used to indicate which flow direction is regarded as positive and negative respectively.
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