Q

What is the recommended calibration procedure for CSL equipment?

A

Item 7.7.2 of ASTM D6760 requires that the “length of the measured ultrasonic profile” is compared to the “measured access duct length.” The CHA-W software can be used to make the comparison. To do so, the probes during data collection must be pulled along the entire length of the tubes. ASTM D6760 does not specify a periodicity for the calibration procedure. Instead, the project's or end user's specifications decide the device's calibration interval. The user can perform the calibration procedure without any special instruments.

According to Items 7.4.1 and 7.4.6 of ASTM D6760, the CSL equipment’s functionality needs checked prior to mobilization and according to the manufacturer’s instructions. The Cross Hole Analyzer model CHAMP has a “Hardware Monitor.” The monitor allows engineers to check the signal at the receiver probe. The signal appears when the probes are a short distance apart (about 5 cm or 2 inches). The signal will become visible even if the probes are out of the water. Use this simple procedure to check that the probes, cables, and CHAMP main unit are correctly working.