4.1.2.4 Securing of components and pre-set controls
Means shall be provided for securing components and pre-set controls to which access or adjustment is prohibited. National legislation may specify the securing that is required.
On a class I instrument, devices to adjust sensitivity (or span) may remain unsecured.
Acceptable solution:
For application of the control marks, the securing area should have a diameter of at least 5 mm.
Components and pre-set controls may be secured by software means provided that any access to the secured controls or functions becomes automatically evident. In addition the following requirements apply to software securing means.