DAKOTA ULTRASONICS MAX II Operation Manual page 90

NOTES:
 The Dakota Ultrasonics MAX II must be calibrated, or zeroed, as described in the
procedure entitled Measuring System Zero in 8.1.
 The sample bolts should be left to soak at the measured temperature points for a
period of not less than 20 minutes, to insure that temperature is uniform
throughout the sample.
 If a water bath is used, care must be taken to avoid immersion of the ultrasonic
transducer.
Determination of the Temperature Factor is accomplished by solving the equation:
Where:

T
p
Temperature Factor
1) Stabilize the sample bolt at approximately 48
used this is accomplished in a stirred bath of ice and water. Measure and
record this minimum temperature as T
Note: The following steps assume that the user has performed the steps in the
previous section and calibrated the velocity. Therefore, the velocity has been
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 A minimum of three sample bolts, which are representative of the bolt
type and geometry for which the Temperature Factor is to be determined.

( )
L L
 6
0 10
T

( )
L T T
0
T
Calibrating the Temperature Factor
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L = Ultrasonic Length at Beginning Temperature (T
0
L = Ultrasonic Length at Ending Temperature (T)
T
T = Beginning Temperature
0
T = Ending Temperature
0
F. If the water bath method is
0.
85
MAX II Bolt Tension Monitor
)
0
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