BS EN ISO 4064-3:2014 pdf free
BS EN ISO 4064-3:2014 pdf free.Water meters for cold potable water and hot water
Every indicating device shall provide means for visual, non-ambiguous verification testing and calibration
The visual verification may have either a continuous or a discontinuous movement
In addition to the visual verification display, an indicating device may include provisions for rapid testing by the inclu-sion of complementary elements e.g. star wheels or discs),providing signals through externally attached sensors.
Verification devices一Visual verification displays The value of the verification scale interval, expressed in cubic metres, shall be of the form:1 x 10n,2x 10nor 5x 10n,where n is a positive or negative whole number, or zero The indicated volume is given by a line of digits appearing in one or more apertures For analogue or digital indicating devices with continuous movement of the first element, the verification scale interval may be formed from the division into 2, 5 or 10 equal parts of the interval between two consecutive digits of the first element. Numbering shall not be applied to these divisions
For digital indicating devices with discontinuous move-ment of the first element, the verification scale interval is the interval between two consecutive digits or incremental movements of the first element
On indicating devices with continuous movement of the first element, the apparent scale spacing shall be not less than 1mmandnotmorethan5mm
The scale shall consist of either:
a) lines of equal thickness not exceeding one quarter of the scale spacing and differing only in length; or
b) contrasting bands of a constant width equal to the scale spacing
A place shall be provided on the meter for affixing the verifi-cation mark, which shall be visible without dismantling the meter The water meter shall be clearly and indelibly marked with the information listed in the following, either grouped or distributed on the casing, the indicating device dial, an iden-tification plate or on the meter cover if is not detachable.BS EN ISO 4064-3 pdf free download.
