SPECIAL CALIBRATION (SP. CAL.)
5. SHIFT FUNCTIONS
CAUTION
Do not use Special Calibration #12; it is not operational!
The 4640-B Thin Layer Density Gauge is factory calibrated for a
density range of 100 to 170 pcf (1602 to 2723 kg/m
3
). However, in
some instances the asphalt mix may contain materials such as iron
slag, glass, large aggregate, rubber, and so on that will result in a
different asphalt composition and texture for which the gauge is not
calibrated.
The Special Calibration function allows the user to re-calibrate the
gauge for use on materials that are not covered by the factory
calibration. Once the special calibration is enabled, it remains active
until the gauge is turned off or the factory calibration is enabled
again.
Special Calibration uses the average of 5 to 25 measurements. This
average and the density obtained by another method (such as core
samples) are used to re-calculate the gauge constants.
Up to eleven calibrations can be stored in the gauge. These
calibrations will be referenced by the calibration number.
Press 〈SHIFT〉 and 〈SP. CAL.〉.
SPEC. CALIB: OFF
Press: 1- enable
2- disable
3- New calib.
Model 4640-B 5–5
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