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ELECTROMATIC TI-25M-MMX Manual Download Page 6

– 6 –

The DOWN arrow key has two functions. When the 
TI-25M-MMX is in the CAL mode, this key is used to decrease 
numeric values on the display. An auto-repeat function is built in, 
so that when the key is held down, numeric values will decrement 
at an increasing rate. When the TI-25M-MMX is not in calibration 
mode, the DOWN arrow key switches the display backlight 
between three available settings. OFF will be displayed when the 
backlight is switched off. AUTO will be displayed when the back
light is set to automatic mode, and ON will be displayed when the 
backlight is set to stay on. In the AUTO setting, the backlight will 
illuminate while the TI-25M-MMX is making a measurement and 
turn off after several seconds to conserve battery life.

The ALRM key has two functions. By holding down the ALRM 
key when powering up the TI-25M-MMX, the audible beeper will 
be turned on or off accordingly. After the unit has been turned on, 
pressing the ALRM key will toggle the alarm mode to the on/off 
positions and allow the user to enter a nominal thickness value. 
Refer to page 18 for details on how to use the alarm feature.

The DUAL-MULTI key is used to toggle pulse-echo ( flaw & pit 
detection), and echo-echo ( eliminate paint & coating thickness ). 
This enables the user to very conveniently switch between modes 
depending on application requirements. Refer to page 17 for a 
complete explanation of this feature.

The SEND key is used to send the currently displayed 
thickness measurement to an external storage device via the 
TI-25M-MMX’s RS232 port. Refer to page 18 for an explanation 
of how to use this feature

3.5 LCD Display

The numeric portion of the display consists four
complete digits preceded by a leading “1”, and

is used to display numeric values, as well as

occasional simple words, to indicate the status of

various settings. When the TI-25M-MMX is displaying thickness measure-
ments, the display will hold the last value measured, until a new measure-
ment is made. Additionally, when the battery voltage is low, the entire dis-
play will begin to flash. When this occurs, the batteries should be replaced.

These eight vertical bars form the Stability
Indicator. When the TI-25M-MMX is idle, only
the left-most bar and the underline will be on.
While the gauge is taking a measurement, six or

seven of the bars should be on. If fewer than five bars are on, the
TI-25M-MMX is having difficulty achieving a stable measurement, and 
the thickness value displayed will most likely be erroneous.

1.8.8.8.8

+

IN MM/

µ

s

ALRM

SEND

DUAL

MULTI

1.8.8.8.8

+

IN MM/

µ

s

– 23–

11.2 Acoustic Velocity Table

Aluminum

0.2500 6350 

Bismuth 0.8600

2184

Brass 0.1730 

4394 

Cadmium 0.1090  2769
Cast Iron 

0.18000 

4572

Constantan 0.2060 

5232 

Copper 0.1840 4674
Epoxy resin 

0.1000 

2540

German silver 

0.1870 

4750

Glass, crown

0.2230 

5664 

Glass, flint 

0.1680 

4267 

Gold 0.1280 

3251

Ice 0.1570 

3988

Iron 0.2320 

5898 

Lead 0.8500

2159 

Magnesium 0.2280 

5791

Nickel 0.2220 

5639 

Nylon 0.1020 

2591

Paraffin 0.0870 2210 
Platinum 0.1560  3962 

 

Plexiglass 0.1060  2692 
Polystyrene 0.0920 

2337 

Porcelain 0.2300  5842 
PVC

0.0940 2388

Quartz glass 

0.2220 

5639

Rubber, vulcanized 

0.0910 

2311

Silver

0.1420 3607

Steel, common 

0.2330 

5920

Steel, stainless

0.2230 

5664

Stellite 0.2750 

6985

Tin 0.1310 

3327

Titanium 0.2400  6096
Tungsten 0.2100  5334
Zinc 0.1660 

4216 

Material Velocity  Velocity

Type Inches/µs 

Meters/s 

Notes: 1. These values are to be used only when a suitable sample of known thick-

ness is not available for calibrating, as slight variations in material 
composition, finishing (hardening, polishing, etc.) or shape can affect the
acoustic velocity. 

... 

Notes:

2. “

✔

”denotes the factory default setting for acoustic velocity.

✔

Summary of Contents for TI-25M-MMX

Page 1: ...LECTROMATIC All returns for warranty or non warranty repairs and or replacement must be authorized by ELECTROMATIC in advance with all repacking and shipping expenses to the address below to be borne by the purchaser THE FOREGOING WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING BUT NOT LIMITED TO THE WARRANTY OF MERCHANTABILITY AND FITNESS FOR ANY PARTICULAR PURPOSE OR A...

Page 2: ...iece of known thickness Ideally this sample material should be a part of the same piece being measured or at least from the same lam ination batch By calibrating to each test piece individually the effects of varia tion of sound velocity will be minimized An additional important consideration when measuring laminates is that any included air gaps or pockets will cause an early reflection of the ul...

Page 3: ...ecreases In most applications with surface temperatures less than about 200 F 100 C no special procedures must be observed At temperatures above this point the change in sound velocity of the material being measured starts to have a noticeable effect upon ultrasonic measurement At such elevated temperatures it is recommended that the user perform a calibration procedure refer to page 11 on a sampl...

Page 4: ...reezing Point 20 F Vapor Pressure N A Evaporation Rate N A Specific Gravity 1 0Z Solubility in Water complete pH 7 35 7 9 Acoustic Imp 1 726x106 Vapor Density N A Appearance and Odor water white opaque gel bland odor Section 4 Fire and Explosive Hazard Data Flash Point none Upper Exposure Limit none Lower Exposure Limit none Special Fire Fighting Procedures N A Extinguishing media N A Unusual Fire...

Page 5: ...M 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 ...

Page 6: ...lay numeric values as well as occasional simple words to indicate the status of various settings When the TI 25M MMX is displaying thickness measure ments the display will hold the last value measured until a new measure ment is made Additionally when the battery voltage is low the entire dis play will begin to flash When this occurs the batteries should be replaced These eight vertical bars form ...

Page 7: ...ng the probe supplied with the TI 25M MMX the user should perform a Probe Zero as described in Section 4 2 The Probe Zero Test Plate is used for this task It is located on the top edge of the gauge as shown in the photo below It also serves as the battery compartment cover Note The thickness of this plate is not important and it should not be used as a Calibration Test Plate A precision 4 step Tes...

Page 8: ...the factory calibrated for steel with an acoustic velocity of 0 2330 IN µs 5920 M s To measure the thickness of any other material the calibration will have to be changed by adjusting the acoustic velocity to the appropriate value for the specific material being measured To determine the proper acoustic velocity for the non steel material refer to the Acoustic Velocity Table section 10 1 After det...

Page 9: ... this happens the TI 25M MMX may perform a measurement through this couplant film resulting in a measurement that is larger or smaller than it should be This phenomenon is obvious when one thickness value is observed while the transducer is in place and another value is observed after the transducer is removed In addition measurements through very thick paint or coatings may result in the paint or...

Page 10: ...lse echo mode by pressing the Dual Multi key to toggle the modes Note The Probe Zero feature is not used in Echo Echo Thru Paint mode and has been disabled If the PRB 0 key is pressed while in this mode nO followed by Prb0 will be displayed 19 10 0 TRANSDUCER SELECTION The TI 25M MMX is inherently capable of performing measurements on a wide range of materials from various metals to glass and plas...

Page 11: ...tting the sound velocity described in the following pages Note Although the TI 25M MMX has a thru paint coating feature one and two point calibrations must be performed on material with the paint or coating removed Failure to remove the paint or coating prior to calibration will result in a multi material velocity calculation that may be different from the actual material velocity intended to be m...

Page 12: ...M symbol is flashing press the CAL key again so that the IN ms or M s symbols are flashing 3 Use the UP and DOWN arrow keys to adjust the displayed velocity up or down until it matches the sound velocity of the material to be measured 17 8 0 DUAL MULTI MODE Often times users and inspectors in the field are faced with coated materials such as pipes and tanks Typically inspectors will need to remove...

Page 13: ...upled repeat step 4 6 Press the CAL key The IN or MM symbol should begin flashing 7 Use the UP and DOWN arrow keys to adjust the displayed thickness up or down until it matches the thickness of the sample piece 8 Press the Probe key The display will flash 1OF2 Repeat steps 3 through 8 on the second calibration point The TI 25M MMX will now display the sound velocity value it has calculated based o...

Page 14: ...emoved from the sample after a measurement the last reading will be retained on the display b Occasionally a small film of couplant will be drawn out between the probe and the surface as the probe is removed When this happens the TI 25M MMX may perform a measurement that is larger or smaller than it should be This phenomenon is obvious when one thickness value is observed while the probe is in con...

Page 15: ...ng Instructions CHECK LINE BY ELECTROMATIC Includes special version Model TI 25M MMX EXT MMX310 Distributed by ABQ Industrial LP USA Tel 1 281 516 9292 888 275 5772 eFax 1 866 234 0451 Web https www abqindustrial net E mail info abqindustrial net ...

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