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DFX-444 Operator’s Manual Issue 3
4
with temperature variations. All calibrations should be
performed on site with test blocks at or near the same
temperature as that expected on the test piece, to minimize
errors.
E. Transducer/probe Condition. The transducer/probe used
for testing must be in good condition, without noticeable wear
of the front surface. The specified range of the
transducer/probe must encompass the complete range of the
thickness to be tested and/or the types of discontinuities to be
investigated. The temperature of the material to be tested
must be within the transducer/probe’s specified temperature
range.
F. Use of Couplants. Operators must be familiar with the use of
ultrasonic couplants. Testing skills must be developed so that
couplant is used and applied in a consistent manner to
eliminate variations in couplant thickness which can cause
errors and inaccurate readings. Calibration and actual testing
should be performed under similar coupling conditions, using
a minimum amount of couplant and applying consistent
pressure to the transducer/probe.
1.6 Disclaimer of Liability
All statements, technical information and recommendations
contained in this manual or any other information supplied by
Dakota Ultrasonics in connection with the use, features and
qualifications of the DFX-444 are based on test believed to be
reliable, but the accuracy or completeness thereof is not
guaranteed. Before using the product you should determine its
suitability for your intended use based on your knowledge of
ultrasonic testing and the characteristics of materials. You bear all
risk in connection with the use of the product.
Your are reminded that all warranties as to merchantability and
fitness for purpose are excluded from the contract under which the
product and this manual have been supplied to you. The Seller’s
only obligation in this respect is to replace such quantity of the
product proved to be defective.
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