| Surface pressure is measured by a Honeywell Precision Barometer (HPB) that uses silicon sensor technology with microprocessor-based signal compensation, the latter of which eliminates the need to insulate or temperature regulate the instrument. The HPB provides accurate and stable measurements in a pressure range of 500-1200hPa (=500-1200 mb). When operating under temperature ranging between –40°C - 85°C, its accuracy is 0.4hPA (=0.4mb). The long-term stability of this instrument is estimated to be 0.25hPa (=0.25mb) per year. This barometer is well adapted to environmental conditions with negligible sensitivity to humidity, acceleration, and a good resistance to vibrations, mechanical and temp shocks. The HPB is attached to the communications mast above the main bridge, in an area shielded from the wind. This location, along with the use of the the use of a RM Young pressure port, minimizes the dynamic pressure due to wind that can adversely affect the barometer mesurements. |
