Sch 1A para 9
The instrument shall be accompanied by information on its operation, unless the simplicity of the regulated measuring instrument makes this unnecessary. Information shall be easily understandable and shall include where relevant: (a) rated operating conditions; (b) mechanical and electromagnetic environment classes; (c) the upper and lower temperature limit, whether condensation is possible or not, open or closed location; (d) instructions for installation, maintenance, repairs, permissible adjustments; (e) instructions for correct operation and any special conditions of use; (f) conditions for compatibility with interfaces or regulated measuring instruments.