Checkline TI-CMX User 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
-51-
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