MIT MIT-SCAN-T3 User manual

Version 02/2021
Instruction Manual
MIT-SCAN-T3
MIT Mess- und Prüftechnik GmbH
www.mit-dresden.de

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Instruction Manual MIT-SCAN-T3 Version 02/2021
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Table of contents
1 Method and requirements .............................................................. 7
1.1 Measuring method ...................................................................... 8
1.2 Reflectors................................................................................... 9
1.2.1 Measuring range .................................................................... 11
1.3 Measurement environment ........................................................ 12
1.4 Device calibration ..................................................................... 13
2 Thickness measuring device ......................................................... 14
2.1 Interfaces ................................................................................ 15
2.1.1 Recharging the device ............................................................ 15
2.1.2 Data exchange via USB interface ............................................. 16
2.1.3 Headphone interface .............................................................. 16
2.1.4 Bluetooth interface................................................................. 16
2.2 Device number and firmware ..................................................... 17
2.3 Carrying strap........................................................................... 17
2.4 External charging cradle ............................................................ 18
2.5 Operation................................................................................. 19
2.6 Main Menu ............................................................................... 19
2.6.1 Menu “Measure”.................................................................... 20
2.6.2 Menu “Data”.......................................................................... 21
2.6.3 Menu “Settings”..................................................................... 22

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3 Performing a measurement........................................................... 22
3.1 Before the measurement ........................................................... 22
3.2 Measuring sites set up on MIT-SCAN-T3...................................... 24
3.2.1 Layer system ......................................................................... 25
3.2.2 Select reflectors ..................................................................... 26
3.2.3 Automatic circular plate recognition ......................................... 26
3.3 Measuring procedure................................................................. 28
3.3.1 Reflector search ..................................................................... 28
3.3.2 Measurement......................................................................... 31
3.3.3 Results display ....................................................................... 33
3.3.4 Calculated layer thickness ....................................................... 33
3.3.5 Measured reflector ................................................................. 35
3.3.6 Material quality coefficient ...................................................... 35
3.3.7 Reflector test ......................................................................... 37
3.4 Functionality check acc. to TP D-StB 12 ...................................... 38
4 Warnings and error messages....................................................... 39
5 MIT Project Software ................................................................... 43
5.1 License key and copy protection................................................. 44
5.2 Program settings....................................................................... 45
5.3 Selection of devices................................................................... 46
5.4 Set up of measuring sites at the PC............................................ 47

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5.5 Selection of measured values..................................................... 50
5.6 Correct and delete data............................................................. 51
5.7 Synchronize and save data ........................................................ 52
5.8 Form sheet............................................................................... 53
5.8.1 Form sheet settings................................................................ 53
5.8.2 Data transfer for site measuring .............................................. 54
5.8.3 Calculations in the measurement sheet .................................... 55
5.8.4 Setting up a form sheet .......................................................... 56
5.9 GPS data and Google maps........................................................ 57
6 MIT-SCAN-T3 App........................................................................ 59
6.1 Start Screen ............................................................................. 60
6.2 Prepared measuring points ........................................................ 60
6.3 Measurement ........................................................................... 61
6.4 Data management .................................................................... 62
7 Firmware/Software update ........................................................... 63
8 Plausibility check ......................................................................... 63
9 Technical data ............................................................................. 64
10 Scope of delivery ....................................................................... 65

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Liability
The manufacturer assumes no liability for any damages arising from
•failure to observe the instructions in this manual,
•use of the device for unintended purposes,
•non-compliance with the safety instructions.
The manufacturer assumes no liability for printing errors or other
inaccuracies in the instruction manual.

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Safety instructions
•Recharge the battery when the corresponding icon appears on the
display. Do not leave the device unattended while charging.
•Power off the device before exchanging the battery.
•Do not use the device if the housing is damaged.
•Observe the operating conditions (e.g. operating temperature)
specified under “Technical data” to prevent damage to the device.
•Though the housing seals have been tested extensively, it is
possible that water may enter the device during heavy rainfall. If
this happens, stop operating the device and ensure it is completely
dry before using it again.
•When taking measurements on hot asphalt make sure only the
sensor unit contacts the asphalt. Electronics as well as mechanical
parts of the control unit are designed for the from −10 °C to
+50 °C only.
•Observe local safety regulations when performing measurements.
•Mechanical loads, such as permanent vibrations or impacts on a
hard surface may cause damages and malfunctions such as
measurement errors. In this case, the device has to be checked by
the manufacturer and, if necessary, has to be recalibrated.

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•The device may only be used or moved when the telescopic tube is
locked.
•No structural changes may be made (replacement or additional
attachment of objects).
•The device may only be used for thickness measurements according
to ASTM E3209, AASHTO T-T359 or German Standard TP D-StB 12.
•Warranty service will only be accepted if only original accessories or
reflector types have been used. The device is calibrated by the
manufacturer with standardized reflectors (standard procedure).
Differing material may cause wrong measurement results as the
calibrations do not match with reflector types.

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1Method and requirements
MIT-SCAN-T3 provides the user with accurate and non-destructive
measurement of asphalt and concrete pavement layer thickness in
accordance with ASTM E3209
1
, AASHTO T-T359
2
and German
standard TP D-StB 12
3
.
The device uses pulse induction, a further development of eddy current
technology. It requires that aluminum or galvanized steel reflectors
are installed under each layer to be measured.
The measurement technique is based on the principles of magnetic
induction tomography and analyzes the temporal and spatial course of
eddy current fields generated in standardized reflectors.
MIT-SCAN-T3 can be used on all layers of surfacing materials
common in building and road construction such as bituminous
composites, concrete or blast furnace slag. Areas of use include new
road/ road structure construction, sub-base construction as well as
pavement inspection and rehabilitation of existing roads
1
Issued by ASTM International.
2
Issued by American Association of State and Highway Transportation Officials.
3
TP D-StB 12, “Technical specifications for determining pavement layer thicknesses in
road construction”, issued by FGSV Verlag GmbH.
Fig. 1 MIT-SCAN-T3
Attention!
Only install reflectors
specified by MIT

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1.1 Measuring method
Electromagnetic layer thickness measurement with MIT-SCAN-T3 is
based on pulse induction technology. The method requires reflectors to
act as antipoles at the base of the layer being measured (s. section
1.2, p. 9).
The MIT-SCAN-T3 measuring probe is equipped with an emission coil
and four sensors (s. Fig. 2 Emission field).
The emission coil emits a magnetic field at regular intervals. This field
induces a current in the installed antipole (s. Fig. 3 Induced current).
As it subsides temporally, a response field is generated (s. Fig. 4
Response field) which in turn is recorded by the four sensors and
evaluated by the device.
During a measurement run over a reflector, up to 200 pulses are
emitted and signals recorded. This data quantity ensures the high
reliability of the measuring method.
Fig. 4 Response field
Fig. 2 Emission field
Fig. 3 Induced current

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1.2 Reflectors
Name
Description
Material
thickness
Max.
depth4
AL RO 07
AL RO 12
AL RO 30
Circular plate
Diameter: 7, 12 and 30 cm
Material: Aluminum
1.0 mm
1.0 mm
0.5 mm
12 cm
18 cm
35 cm
AL RE 30x70
AL RE 30x100
Rectangle (foil/sheet)
Width x Length 30 x 70/100 cm
Material: Aluminum
0.1/0.3 mm
0.1/0.3 mm
50 cm
50 cm
ST RO 12
ST RO 30
Circular plate
Diameter: 12 and 30 cm
Material: Steel
1.00 mm
0.65 mm
18 cm
35 cm
Table 1 Description of the available antipoles
4
Information about the measuring range: see Table 2 Measuring range of
reflectors
Special note:
Devices are calibrated and
validated for use with
specified reflectors.
Reflectors must be of
verified quality.
MIT circular reflectors
carry MIT´s logo.
The packaging comes with
quality seal (s. Fig. 5) and
label showing a batch
number.
Fig. 5 Quality seal

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Reflectors supplied by MIT are checked and verified thru control tests.
A certificate is issued for each batch. If required, this certificate may be
viewed or requested at MIT by the user (s. Fig. 6). MIT plates are
imprinted with the MIT logo to avoid confusion with any reflector
imitations not validated for the use of MIT-SCAN-T3.
Please ask MIT for a list with tested suppliers of circular plates in your
country.
Attention: Measuring device and reflectors are one unit. If
unauthorized or damaged reflectors are used, the accuracy of
the layer thickness measurement system can’t be guaranteed.
There may be significant variations between measured
thickness and real thickness.
Fig. 6 Reflector quality
validation certificate

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1.2.1 Measuring range
MIT-SCAN-T3 guarantees the correctness of the measurement results
only for the specified measuring ranges and approved reflectors.
Name
Standard measuring range
AL RO 07
AL RO 12
AL RO 30
1,5 - 12 cm
1,5 - 18 cm
4,0 - 35 cm
AL RE 30x70, 30x100 (100 µm)
AL RE 30x70, 30x100 (300 µm)
1,5 - 50 cm
2,0 - 50 cm
ST RO 12
ST RO 30
1,5 - 18 cm
4,0 - 35 cm
Table 2 Measuring range of reflectors
Please note:
If other measuring ranges
are required, please contact
the manufacturer.

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1.3 Measurement environment
Metallic objects should not be present within a radius of one meter
around a measurement point, such as:
Manhole covers
Drains
Road restraint systems (crash barriers)
Other reflectors
Cars, construction machinery
Strong electromagnetic fields (caused for example by radar systems,
radio masts, underground cables) in the environment of a measuring
point can influence the measuring accuracy. The influence depends on
the strength of the source and the distance to it. If it is suspected, that
strong electromagnetic fields are located near to a measuring point,
several measuring runs should be carried out at this measuring point.
If the deviation of the individual results is higher than the specified
device tolerance, this can be an indication of the influence of
electromagnetic fields on the measurement signal.
Wearing safety footwear such as steel-toed boots has no influence on
the measurement as long as they are not too close to the probe.
Fig. 7 Imprinted MIT plate

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Conditions that have no impact on the measurement are
Wet roads
Hot asphalt
Slightly freezing temperatures
1.4 Device calibration
The German standard TP D-StB 12 stipulates annual recalibrations of
the thickness measurement device. Depending on the country of use,
there may be regulations from the authorities regarding calibration
requirements.
In order to obtain accurate measurement results, the device should be
serviced and calibrated at regular intervals even if it’s not required by
the authorities.
The user commissions the calibration of relevant reflector sizes. A valid
certificate of calibration with a tabular and graphical report of the test
results is issued for each calibrated reflector type.
Only calibrated reflectors are visible and selectable in the menu of the
device. Uncalibrated and hidden formats can be reactivated with the
next calibration, in case the area of application changes and additional
reflectors are required.
Please note:
In Germany, the TP D-StB 12
standard stipulates the need
for calibration of thickness
measuring devices on an
annual basis.
Fig. 8 Calibration label

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The date of the last calibration will appear on the display when the
device is switched on. Additionally, the next calibration due date is
indicated on a calibration label on the device's probe (s. Fig. 8).
2Thickness measuring device
The measuring device consists of two functional units (s. Fig. 9):
(1) Control unit
(2) Measuring probe
They are connected by a telescopic rod. The telescopic rod is secured
with tube locks (4).
The control unit is equipped with:
(5) Display
(6) Directional pad (D-pad)
(7) Search key
(8) Interfaces for a USB flash drive, headphones and charger
Coils for emitting and receiving signals are integrated in the probe. The
traversed measurement path is determined based on the front wheel's
rotation.
(1)
(6)
(8)
(5)
(7)
(4)
(3)
(2)
Fig. 9 MIT-SCAN-T3 design

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Preparing MIT-SCAN-T3 for operation:
Remove the device from its transport box and loosen both tube
locks by turning them counterclockwise.
Extend the middle tube segment of the telescopic rod to the
desired length and tighten the upper tube lock.
Align control unit and probe by turning the lower tube segment
by 90 degrees counterclockwise.
Extend the lower segment and tighten the tube lock.
2.1 Interfaces
At the upper end of the control unit under a lid are three interface
connections (s. Fig. 10):
1) Battery charger
2) USB flash drive
3) Headphones
2.1.1 Recharging the device
The integrated battery can be charged directly in device. Connect the
supplied power adapter or the 12 V car charger to the recharge port on
the device. The battery charge level is shown on the display. A full
recharge of the battery will take about 1.5 hours.
3)
2)
1)
Fig. 10 Interfaces

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2.1.2 Data exchange via USB interface
With USB interface, measurement data can be exchanged between
device and PC. Connect a USB flash drive to device and opening the
Main Menu starts the automatic synchronization of data between MIT-
SCAN-T3 and USB flash drive. Remove the USB flash drive after having
exchanged data successfully. Measurement data is stored in file “MIT-
SCAN-T3_ device number .T3”. Use MIT Project Software to import this
file into a form sheet for further processing.
2.1.3 Headphone interface
This interface provides a connection for headphone with 3.5 mm audio
jack. During a reflector search, acoustic signals are emitted depending
on the received signal. Using headphones will make it easier to locate
reflectors in high-noise environments.
2.1.4 Bluetooth interface
Bluetooth module allows wireless connection to mobile Apps.

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2.2 Device number and firmware
Device number can be found on a label below the USB, headphone and
charger interface. Device number, firmware version and last calibration
date will also appear on the bottom line of the start screen after
power-on (s. Fig. 11).
2.3 Carrying strap
The attachment of the carrying strap is shown in Fig. 12. The carabiner
of the belt is inserted into the eyebolt at the upper end of the control
unit case. Open the loop at the other end of the belt, place it directly
below the control unit case around the tube and close it using the snap
button.
To release the snap button the knob (s. detail Fig. 12) must be pulled
upwards. If the mechanism is sufficiently relieved, the two components
are release from each other and the loop is opened. To lock the snap
button, the ball head of the pin must be pressed into the buttonhole
until both parts engage into each other.
The device with connected strap is shown in Fig. 1 (p. 7).
Fig. 11 Start screen
Fig. 12 Carrying strap

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2.4 External charging cradle
The (replacement) battery can be charged outside device (e.g. in the
office or car) with the charging cradle (accessory part). The charging
cradle works with both charging cables, which are delivered with MIT-
SCAN-T3.
The battery can be quickly removed or replaced without additional
tools:
1. Loosen the screw
2. Remove the battery
3. Insert replacement battery
4. Tighten the screw
Fig. 13 External cradle
Fig. 14 Inserting the battery