Check-line TI-25M Manuale utente

TI-25M

ULTRASONIC

THICKNESS GAUGE

Operating Instructions

CHECK

•

LINE

BY ELECTROMATIC

– 2 –

TABLE OF CONTENTS

1.0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.0 Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

3.0 Overview of Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3.1 Gauge

3.2 Contents of Kit

3.3 Probe

3.4 Keypad

3.5 LCD Display

3.6 Probe Zero Plate

3.7 Probe Connector Receptacle

3.8 Battery Compartment (Battery Replacement)

4.0 Getting Started. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.1 Connecting The Probe

4.2 Turn On The Power

4.3 “Zeroing” The Probe

4.4 Changing Units — inches to mm

4.5 Checking Calibration With The Test Plate

4.6 Preparation Of The Surface

5.0 Quick Start Instructions — Steel Thickness. . . . . . . . . . . . . . 13

6.0 Calibration For Measuring Thckness

Of Materials Other Than Steel. . . . . . . . . . . . . . . . . . . . . . . . . . 15

6.1 Acoustic Velocity Table

6.2 Changing Calibration — Acoustic Velocity is Known

6.3 Changing Calibration — Acoustic Velocity is Not Known

7.0 Description of Measuring Modes . . . . . . . . . . . . . . . . . . . . . . . 19

8.0 Measuring Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

8.1 General Notes On Measurements

8.2 Measurements Of Pipes Or Cylindrical Parts

8.3 Measurements On Materials At High Temperatures

9.0 Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

10.0 Material Safety Data Sheet (MSDS) . . . . . . . . . . . . . . . . . . . . . 24

11.0 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

OI-UT004M

– 3 –

1.0 INTRODUCTION

The CHECK•LINE®TI-25M Ultrasonic Thickness Gauge measures the

wall thickness of metals, glass, ceramics and many rigid plastics. This gauge

uses the “pulse-echo” principle of ultrasonic testing where a short ultrasonic

signal is transmitted from the probe. The signal travels through the measure-

ment sample until it is reflected back towards the probe from the back side

of the material. The elapsed time for the complete cycle is measured and

converted to an accurate thickness reading.

The TI-25M can be used to measure the extent of corrosion on the opposite,

inaccessible side of the wall by using the “Subtractive Method.” When the

thickness of the original wall is known, subtracting the thickness reading

obtained from the TI-25M will determine the extent of corrosion at the point

of probe placement. If the original wall thickness is not known, test readings

should be made along a grid of equally-spaced points to obtain a profile of

the thickness readings. The smallest thickness reading will locate the area of

greatest concern.

The TI-25M is factory-set to measure steel. The gauge can be easily adjust-

ed for accurate thickness readings on other materials. Refer to sections 6.0

through 6.3. To change the measuring units from inch (factory setting) to

mm refer to section 4.4.

2.0 PRECAUTIONS

Do not use the standard probe in applications where material temperatures

exceed 200 °F (100 °C) as the probe will be damaged. Special High

Temperature Probes should be used. Consult factory.

Keep the gauge free of dust (especially metal powders, carbon, etc.) as they

will damage the gauge. Use a damp cloth to clean the gauge after use.

DO NOT USE CHECMICAL SOLVENTS OF ANY KIND.

– 4 –

3.0 OVERVIEW OFGAUGE

3.1 Gauge

Probe

Receptacles

Probe Zero Test Plate and

Battery Compartment Cover

Backlit LCD

Display

Membrane

Keypad

Probe

– 5 –

3.2 Contents Of Kit

The TI-25M is supplied as a complete kit with the following:

a. Gauge

b. Two (2) AA batteries

(installed in gauge)

c. Probe/cable assembly

d. 4 oz. Bottle of coupling fluid

e. NIST-traceable calibration

certificate

f. Operating instruction manual

g. Foam-filled carrying case

3.3 Probe

The probe transmits and receives the ultrasonic sound waves which the

TI-25M uses to calculate the thickness of the material being measured. The

probe must be used correctly in order for the TI-25M to produce accurate

and reliable results.

A small amount of “coupling” fluid, commonly called “couplant” is used to

insure that there are no air gaps between the probe and the material surface.

Grasp the probe by the molded rubber grip and place it on top of the mater-

ial surface. Apply moderate pressure to the top surface of the probe with

your index finger (A) or thumb (B) to stabilize the probe and to keep the

wearface seated flat against the measurement surface.

Probe

Wearface

– 6 –

3.4 Keypad

The TI-25M is supplied with a membrane keypad mounted

on the front of the instrument body. It consists of six (6)

keys, each performing one or more functions as described

below.

The CAL key is used to enter and exit the Tl-25M’s two

Calibration modes. The Acoustic Velocity Calibration mode is

used to adjust the acoustic velocity for the material to be mea-

sured. The Measurement Calibration mode is used to increase or

decrease the displayed thickness reading to calibrate to a known

thickness value.

The INCH/MM key is used to change the measuring units from

inches to mm. Each time the key is pressed the units will change

from one to the other.

The UP arrow key performs the following two functions:

1. When in the Calibration mode, pressing the UP arrow

key will cause the numeric values to increase. By

pressing and holding the key, the numbers will change

more rapidly.

2. When in the Measuring mode, pressing the UP arrow key

will turn the Scan Measuring mode on and off each time

it is pressed. The display will momentarily flash indicating

whether the Scan mode is on or off.

The DOWN arrow key performs the following two functions:

1. When in the Calibration mode, pressing the DOWN

arrow key will cause the numeric values to decrease. By

pressing and holding the key, the numbers will change

more rapidly.

2. When in the Measuring mode, pressing the DOWN

arrow key will change the Display Backlight mode from

OFF to AUTO to ON. The currently selected mode will

momentarily flash on the display.

The PROBE ZERO key is used to “zero” the probe in a similar

way as a micrometer is “zeroed” before use. If the tool is not

zeroed correctly, the measurements will not be accurate.

The ON/OFF key is used to turn the power on as well as turning

the power off. If the Tl-25M is idle for five (5) minutes the gauge

will automatically power off.

CAL

INCH

PROBE

ZERO

OFF

CAL PROBE

ZERO

INCH

MM ON

OFF

– 7 –

3.5 LCD Display

The LCD Display provides the operator with important information as

detailed below. The display has a user-selected Backlight mode which can

be set for the following operation:

1. ON. The backlight is illuminated whenever the power is on.

2. OFF. The backlight is never illuminated (to save battery power).

3. AUTO. The backlight is automatically illuminated each time a

measurement is made.

The Backlight mode is set by pressing the key. Each time the key is

pressed, the mode will change from one to the other. “ON,” “OFF” or

“AUTO” will momentarily flash on the display indicating the currently set

Backlight mode..

• Measurement values

• Acoustic velocity values

• Units of measure

• Bar graph signal stability indicator

• Configuration messages

The numeric portion of the display consists of

4-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 is displaying thick-

ness measurements, the display will retain the last measured value, until a

new measurement is performed.

The eight vertical bars shown form the Stability

Indicator. When the TI-25M is idle, only the

left-most bar and underline will be illuminated.

When a measurement is being performed, six or

seven bars should be illuminated indicating that it is a stable measurement.

If fewer than five bars are illuminated, the TI-25M is having difficulty

obtaining a stable and reliable measurement and the thickness value shown

should be ignored, as it is most likely erroneous.

1.8.8.8.8

+INMM/µs

1.8.8.8.8

+INMM/µs

1.8.8.8.8

+INMM/µs

When the “IN” indicator is illuminated,

the TI-25M is displaying a wall thickness

measurement in INCH units.

When the “MM” indicator is illuminated, the

TI-25M is displaying a wall thickness measure-

ment in MM units.

When the “IN” and the “µs” indicators are

illuminated simultaneously, the TI-25M is

displaying an acoustic velocity in inches per

microsecond.

When the “M” and the “s” are illuminated

simultaneously, the TI-25M is displaying an

acoustic velocity in meters per second.

3.6 Probe ZeroPlate

When first connecting the probe supplied with the TI-25M, the user should

perform a “Probe Zero” as described in Section 4.3. 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 imporatnt, and it should not be

used as a Calibration Test Plate. A precision 4-step Test Block is optionally

available for this purpose.

– 8 –

1.8.8.8.8

+INMM/µs

1.8.8.8.8

+INMM/µs

1.8.8.8.8

+INMM/µs

1.8.8.8.8

+INMM/µs

3.7 Probe Connector Receptacle

Located on the top edge of the TI-25M housing are the receptacles for the

probe and the probe zero plate.

The connectors for the probe

are non-polarized so the con-

nector at the end of the probe

cable can be inserted into

this receptacle in either

orientation. Make sure the

connector is “well seated” in

the receptacle.

3.8 Battery Compartment (Changing The Battery)

The battery compartment is

located under the probe zero

test plate. To open the battery

compartment, unscrew the

probe zero plate by rotating it

counterclockwise. The TI-25M

operates on two (2) AA

Batteries (1.5 V). If desired,

rechargeable batteries may be

used.

The TI-25M is shipped with the batteries installed. Insert batteries in the

polarity indicated on the rear label.

Note: When the display elements begin to flash off and on repeatedly, the

batteries are low and should be replaced.

Battery Cover

Probe Receptacles

Probe Zero

Plate

– 9 –

– 10 –

4.0 GETTING STARTED

4.1 Connecting The Probe

Grasp the connector located at the end of the probe cable and carefully

insert the connector plugs into the receptacle located at the top edge of the

gauge. Make sure the connector is fully inserted into the receptacle. The

orientation of the plugs does not matter as they are non-polarized.

4.2 Turn On The Power

Press the key. All of the LCD Display elements will momentarily

illuminate. The firmware revision will then be momentarily shown

(for factory troubleshooting purposes only). Eventually the display will

show “0.000” (or “0.00” if using metric units), indicating it is ready for

use.

Note: 1. The gauge is turned off by pressing the key again.

2. The gauge will automatically power off after 5 minutes of

non-use.

3. All settings will be retained in non-volatile memory.

4.3 “Zeroing”The Probe

The Probe Zero Plate is used to “zero” the probe for calibration purposes.

Normally, this procedure is required only when the probe is connected to

the instrument for the first time, but since this process takes less than 10

seconds, we recommend performing the Probe Zero function occasionally

as described below.

1. Check that the probe face (wear surface) is clean and free of debris.

2. Place a small drop of the supplied coupling fluid on the built-in

Probe Zero Plate located on the top of the gauge.

3. Press the probe firmly against the Plate.

4. The Stability Indicator on the LCD display should have six or

seven bars illuminated and a value should be shown in the display.

5. While maintaining probe contact with the Test Plate, press the

key. The display will show “Prb0” while the TI-25M

calculates its zero point.

Note: The value shown on the display can be recorded and used in the

future to confirm that the gauge is functioning properly.

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