
1/14/2012
22
For You to Do
Ke
eping Track of Pressure Offsets
in the Lab or Field
• Physically locate the instrument in the orientation
that it will have when deployed
– All pressure sensors are sensitive to their orientation
due to gravity on the fluids that fill their capillaries
• Make offset measurement in a constant
temperature environment, with the instrument
temperature the same as the environment
– temperature transient residual effects
• Measure the offset
– Best practice, measure pressure sensor offset
against a barometer
–
In a pinch, measure offset against sea level
– Measure offset needed to zero the sensor
• Maintain a log to observe pressure sensor drift
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