Depends on Poor response design for time due to Non-linear but Subject to Easy to calibrate Cheaper in cost Manual with barometer; Typical +2% of Bourdon Tubes friction and can be unpredictable but needs frequent on certain analogue display Mostly for span design of compensated drift recalibration construction industrial use, mechanism 0->7MPa Depends on Mercury application, ±0.01hPa to Not easy to Manual Fairly good Good Long term expensive Barometer * 500hPa – ±0.1hPa calibrate 1050hPa typical * Mercury is banned due to Minamata Convention and to be phased out by 2020. ** The table contains information on typical values of instrument’s properties, based on the available literature. Cross reference must also be considered from WMO No. 8, Guide to Meteorological Instruments and Methods of Observation, under Annex 1D, Operational Measurement Uncertainty Requirements and Instrument Performance.
Bourdon Tubes Manual with analogue display Depends on design for barometer; Mostly for industrial use, 0->7MPa Typical +2% of span Poor response time due to friction and design of mechanism Non-linear but can be compensated Subject to unpredictable drift Easy to calibrate but needs frequent recalibration Cheaper in cost on certain construction Mercury Barometer * Manual Depends on application, 500hPa – 1050hPa typical ±0.01hPa to ±0.1hPa Fairly good Good Long term Not easy to calibrate expensive * Mercury is banned due to Minamata Convention and to be phased out by 2020. ** The table contains information on typical values of instrument’s properties, based on the available literature. Cross reference must also be considered from WMO No. 8, Guide to Meteorological Instruments and Methods of Observation, under Annex 1D, Operational Measurement Uncertainty Requirements and Instrument Performance.
ICAWS_workshop_Guidance_Document%2017%202017%2029%209_draft.docx