CS
31TGB.73 Instrument marking
ED Decision 2013/011/R
The following applies to all monitoring instruments:
(a) If the cover glass of the instrument is marked and adequate measures are taken to ensure that the cover glass remains in its correct position relative to the graduated dial.
(b) All markings are sufficiently wide and applied to ensure that they are easily and clearly readable by the operator.
(c) The ranges for analogue indicators are identified as follows:
(1) Normal operating range – green;
(2) Caution area – amber or yellow; and
(3) Permissible maximum or minimum value - red radial line.
(d) For digital indicators, the limits of use are displayed close to the indicator or a red signal is showing when the permissible limits are exceeded.
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