The technical support section of the
AGI web site consists of Frequently Ask Questions below and Technical
support notes below left. If you can not find answers to your questions,
please contact Applied Geomechanics Inc.
All versions of the Model 906 "Little Dipper" In-Place Inclinometer and of the Model 722 Borehole Tiltmeter are submersible to 5 bars (50 meters water depth). Higher pressures can be special ordered. All versions of the "DeepWater" Tiltmeter are submersible to 250 bars (2500 meters depth). Higher pressure units can be special ordered. The Model 510 Geodetic Borehole Tiltmeter has been tested to case failure at 489 bars and is conservatively rated for use to 250 bars (2500 meters depth. Higher pressure units are available.
How do I compute accuracy?
The main determinants of accuracy for our tiltmeters and clinometers are: repeatability, linearity and temperature coefficient. Accuracy (in engineering units) is obtained by adding the following specifications: repeatability + (linearity x tilt range) + (temperature coefficient x temperature range). Accuracy can be improved by using a lookup table or polynomial to correct for nonlinearity, and by compensating for temperature change (see our article on "Temperature Compensation" elsewhere in the "Applications" section of the website).
How do I use a tiltmeter?
Tiltmeters are used to precisely measure the angular rotation at their installtion point. The tilt measurements of several instruments can be used to obtain a displacement profile or map of surface elevation changes.
Why don't you list accuracy?
Accuracy is the degree of conformity of the measured value to the true value for a specified set of operating conditions. For a given instrument, accuracy over a narrow tilt range is always better than over a wide range. Similarly, accuracy is better over a narrow temperature range than over the full operating temperature range of the instrument. Because accuracy depends so strongly on operating conditions, we believe that it is better to compute accuracy for the application at hand than to rely on a worst-case accuracy value for the full operating range of the instrument.
