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 ATMOSPHERIC PRESSURE


Aneroid Barometer



What is pressure ? (From Keller Company)

GENERAL Designed for the atmospheric pressure measurement. Direct readings without correction. Principle : elastic bending amplifying of the barometric sensor relating to the atmospheric pressure variations. TECHNICAL SPECIFICATIONS Thermical correction by a bi-metallic element between -10°C and 50°C.
Atmospheric pressure range : 900 hPa to 1050 hPa
Accuracy : ? 1hPa.
 

Mercury Barometer

GENERAL Design for the atmospheric pressure measurement. This type of barometer should be installed inside a building. Principle : equilibrium of forces pressure exercise above a mercury free surface by the atmospheric air column and by the mercury column of the barometer.
  MEASUREMENT SPECIFICATIONS The barometer must be located in a very low or slow temperature variations room. The barometer place has to be protected against direct solar radiation, radiation due to system heating and draught vibrations.
  TECHNICAL SPECIFICATIONS Measurement range : 790 to 1070 hPa
Accuracy : ? 0,25 hPa
Glass barometric pipe
Thermometer graduated each 0.5°C
Scale in hPa, 1/20 vernier
Component elements : bowl mercury, glass barometric pipe, thermometer plunging in a mercury bottle, small board.

Barograph

GENERAL Designed for the atmospheric pressure measurement. Principle : elastic bending amplifying of the barometric sensor relating to the atmospheric pressure variations.

TECHNICAL SPECIFICATIONS Thermical correction by a bi-metallic element between -10°C and 50°C.
Atmospheric pressure range : 900 hPa to 1050 hPa
Accuracy : ? 1hPa. Record on a daily or weekly drum chart.