Part 3 of the standard considers the specific operating conditions of vibration, shock, seismic and mechanical stress conditions to which land-based, and off-shore, industrial-process measurement and control systems or parts of systems may be exposed during operation, storage or transportation. Maintenance and repair conditions are excluded from consideration in this Part 3.
The operating influences considered in this part are limited to those which may directly affect performance of process measurement and control systems. Effects of the specific operating conditions on personnel are not within the scope of this part. The appropriate values of the physical parameters listed here should be used to describe local environments in which equipment is expected to operate, be transported and stored. Only conditions as such are considered; the effects of these conditions on instruments' performance are specifically excluded.
IEC Publication 68: Basic Environmental Testing Procedures gives the basic test conditions for vibration and shock. This part establishes a list of selected limit values for the operating conditions.
Nole. - Similar questions are at present being studied by Technical Committee No. 75: Classification of Environmental Conditions. Upon the issue of this committee's publication, the present publication should be recon-sidered.