
1/14/2012
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How to Measure Pressure
Of
fset in the Lab Using a
Barometer
• With offset in .con or .xmlcon file set to 0.0, pressure
measured by CTD should equal barometric pressure
• Calculate offset (db) =
barometer reading – CTD reading
– Conversion of psia to decibars:
decibars = (psia - 14.7) * 0.6894759
• Enter calculated offset in .con or .xmlcon file
• Example:
– CTD reads -2.5 dbars
– Ba
rometer reads 14.65 psia.
Converting to decibars, barometer reads
(14.65 - 14.7) * 0.6894759 = -0.034 dbars
– offset (db) = barometer reading – CTD reading
= -0.034 - (-2.5) = 2.466
– Application Note 73
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