StandardDetails

This standard specifies the metrological and technical requirements applicable to instruments for the measurement of ambient atmospheric pressure, and to the pattern evaluation. It has relevance to the following types: a) Mercury barometers having a permanent reference vacuum. b) Barometers, for example aneroid barometers, with an elastic sensing element, a permanent reference vacuum and an indication, which may be either analogue, with a pointer and a dial, or digital. 1.2 The standard applies to barometers such as those used for: a) The direct measurement of pressure in laboratories, industrial plants meteorological stations. b) The checking and adjustment of altimeters. 1.3 The standard is not intended to apply to instruments of the highest accuracy, such as those used as national or primary standards. 1.4 The standard applies to barometers designed for use in the range of pressures and temperatures generally occurring at locations at sea-level or at modest elevations (- 200 m to + 2000 m). If the standard is to be applied to barometers to be used at high altitudes, great depths or in special climatic conditions, then some of its provisions must be modified or others added.