Checkline TI-CMX - Manual (Page 6)

2.4 Probe Zero & One Point Calibration
The next steps are to perform a probe zero and calibrate the TI-CMX to the material and
transducer being used. If the sound velocity is unknown, the TI-CMX can be calibrated
to a known thickness sample. This demo will briefly explain both of these techniques.
The TI-CMX is equipped with two zero options:
• Off Block Zero (Automatic Probe Zero) – When this feature is enabled the TI-
CMX will do an electronic zero automatically, eliminating the need for a zero disk or
block.
• On Block Zero (Manual Probe Zero) – When this feature is enabled the transducer
must be placed on the probe zero disk (battery cover located on the top of the unit.
Both zero procedures are outlined as
follows:
Off Block Zero (Automatic Probe
Zero)
1. Be sure all couplant has been
removed from the face of the
transducer.
2. Press the OK key to perform the
automatic probe zero, or ESC key
to cancel the zero operation.
3. The screens illustrated at the right
will be briefly displayed followed
by the main measurement screen.
The TI-CMX is ready to be
calibrated.
-6-
Coating Probe
Identified Coating Probe
Not Identified
Coating Probe
Identified Coating Probe
Not Identified
Performing a Manual Probe Zero (On Block)
NOTE: When the zero probe option is set to manual, the probe
zero disk (battery cap) located on the top of the gauge, will be
used as a zero standard and the warning screen illustrated above
will be displayed.
1. Press the OK or ESC keys to enter the main measurement
screen and begin the manual zero process.
2. Apply a drop of couplant on the transducer and place the
transducer in steady contact with the probe zero disk, and
obtain a steady reading.
A PPENDIX A: V ELOCITY T ABLE
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Material sound velocity sound velocity
in/us m/s
Aluminum 0.2510 6375
Beryllium 0.5080 12903
Brass 0.1730 4394
Bronze 0.1390 3531
Cadmium 0.1090 2769
Columbium 0.1940 4928
Copper 0.1830 4648
Glass (plate) 0.2270 5766
Glycerine 0.0760 1930
Gold 0.1280 3251
Inconel 0.2290 5817
Iron 0.2320 5893
Cast Iron 0.1800 (approx) 4572
Lead 0.0850 2159
Magnesium 0.2300 5842
Mercury 0.0570 1448
Molybdenum 0.2460 6248
Monel 0.2110 5359
Nickel 0.2220 5639
Nylon 0.1060 (approx) 2692
Platinum 0.1560 3962
Plexiglas 0.1060 2692
Polystyrene 0.0920 2337
PVC 0.0940 2388
Quartz glass 0.2260 5740
Rubber vulcanized 0.0910 2311
Silver 0.1420 3607
Steel (1020) 0.2320 5893
Steel (4340) 0.2330 5918
Steel Stainless" 0.2230 5664
Teflon 0.0540 1372
Tin 0.1310 3327
Titanium 0.2400 6096
Tungsten 0.2040 5182
Uranium 0.1330 3378
Water 0.0580 1473
Zinc 0.1660 4216
Zirconium 0.1830 4648