– 5 –
3.4 The Keypad
The TI-25M-MMX interacts with the operator through the
membrane keypad and the LCD display. The functions of
the various keys on the keypad are detailed below, followed
by an explanation of the display and its various symbols.
This key is used to turn the TI-25M-MMX on and off. When the
gauge is turned ON, it will first perform a brief display test by
illuminating all of the segments in the display. After one second,
the gauge will display the internal software version number. After
displaying the version number, the display will show “0.000” (or
“0.00” if using metric units), indicating the gauge is ready for use.
The TI-25M-MMX is turned OFF by pressing the ON/OFF key.
The gauge has a special memory that retains all of its settings even
when the power is off. The gauge also features an auto-power
down mode designed to conserve battery life. If the gauge is idle
for 5 minutes, it will turn itself off.
The PRB-0 key is used to “zero” the TI-25M-MMX in much the
same way that a mechanical micrometer is zeroed. If the gauge is
not zeroed correctly, all of the measurements that the gauge makes
may be in error by some fixed value. Refer to page 10 for an
explanation of this important procedure.
The CAL key is used to enter and exit the TI-25M-MMX’s
calibration mode. This mode is used to adjust the sound-velocity
value that the TI-25M-MMX will use when calculating thickness.
The gauge will either calculate the sound-velocity from a sample
of the material being measured, or allow a known velocity value to
be entered directly. Refer to page 11 for an explanation of the two
CAL functions available.
The IN/MM key is used to switch back and forth between English
and metric units. This key may be used at any time, whether the
gauge is displaying a thickness (IN or MM) or a velocity value
(IN/ms or M/s).
The UP arrow key has two functions. When the TI-25M-MMX is
in calibration mode, this key is used to increase numeric values on
the display. An auto-repeat function is built in, so that when the
key is held down, numeric values will increment at an increasing
rate. When the TI-25M-MMX is not in calibration mode, the UP
arrow key switches the SCAN measurement mode on and off.
Refer to page 15 for an explanation of the SCAN measurement
mode.
ALRM
ON
OFF
IN
M M
DUAL
M ULTI
PRB
SEND
CAL
SCAN
0
ON
OFF
PROBE
ZERO
CAL
INCH
MM
SCAN
– 24 –
1 1 .0 S
PECI FI CAT I ON S
Range
TI-25M-MMX*
Pulse-Echo Mode (Pit & Flaw Detection):
0.040–6.000" (1.01–152 mm)
Echo-Echo Mode (Through Paint & Coatings):
0.100–1.0" (2.54–25.4 mm). With up to 0.040" of coating.
TI-25M-MMX-EXT* Pulse-Echo Mode (Pit & Flaw Detection):
0.100–10.000" (2.54–254 mm)
Echo-Echo Mode (Through Paint & Coatings):
0.200–5.0" (5–127 mm). With up to 0.080" of coating.
Resolution
.001" (0.01 mm)
Display
4
1
⁄
2
-Digit, 0.5" Backlit LCD
Velocity Range
0.0492 to .3937 in./µs. (1250 to 10,000 meters/second)
Probe
TI-25M-MMX
5 MHz, 0.25" Dia. (6.35 mm), High Damp
TI-25M-MMX-EXT
3.5 MHz, 0.5" Dia. (12.70 mm), High Damp
Probe Wearface
PEEK (Polyethylethylkeytone)
Cable
4 ft. (1.2 m) waterproof cable with non-polarized,
quick-disconnect connectors. Optional lengths up to
100 ft. (30 m).
Probe Zero
Steel plate built into battery cover, appriximate thickness
Test Plate
of 0.416" (10.57mm)
Temp. Limits
Ambient: –20 to 120 °F (–30 to 50 °C)
Material:
0 to 200 °F (–20 to 100 °C)
Special high temperature probes are optionally available.
Battery Type
Two AA batteries
Battery Life
200 hours
Weight
7 ounces (196 g)
Size
2.4 x 4.5 x 1.25" (65 x 114 x 35 mm)
Accessories
Included
Probe/cable assembly. 4oz. bottle of coupling fluid,
NIST Calibration Certificate, 2 AA batteries, operating
instructions,hard-plastic carrying case.
Warranty
Gauge: 5 years
Probe: 90 days
*Measuring Range indicated is for steel. Actual range for other materials will
vary based upon the material’s sonic velocity and attenuation.