DMQ QB7 User manual

QB7 User Manual
Hall effect thickness gauge
P/N: QBD 701 – ENG – Rev. 01 – July 2020

QB7 Manual del Usuario
I
Index
Introduction
Measuring principle VII
Sensor accessories
VIII
Target balls VIII
Calibration fixtures IX
Target ball selection
XII
Using the sensor XIII
What can affect measurements XIII
Use of the sensor without the sensor stand
XIV
The QSet button XV
Security information XVI
Connecting the probe to the unit
XVI
Chapter 1 First steps
1.1 Knowing the QB7 1
1.1.1 Front panel 1
1.1.2
Connectors
2
1.2 Rechargeable battery 3
1.2.1 Battery level indicator 3
1.2.2 Charging the battery 3
1.3 Special keys 4
1.3.1 The “Q” key 4
1.3.2 Color backlight illumination 4
Chapter 2
Measuring with the QB7
2.1
Measuring screen modes
5
2.1.1 Large numbers mode (Easy reading) 5
2.1.2 Numeric screen mode-1 (Numerical) 6
2.1.3
Numeric screen mode-2 (Statistics)
7
2.1.4 Num. screen mode-3 (Wall tester) 7

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2.1.5
Graphic screen mode
8
2.2 Use of keys in measuring screens 9
2.3 Icon indicating unit condition 11
2.4
Target ball selection
12
2.5 Calibration 12
2.6 Changing the sensor tip 16
2.7
Sensor tip calibration
17
2.7.1 Tip cal menu 18
2.7.2 Tip adjustment 18
2.7.3
Tip calibration memory
20
Capitulo 3
Menu system and editing
3.1 Basic rules on the user interface 22
3.1.1 Using the menu system 22
3.1.2 Text editor 23
3.2 Main menu 25
3.2.1 Changing the measuring unit 25
3.2.2 Alarm settings 26
3.2.3
Select language
27
3.2.4 Unit information 27
3.3 General configuration 28
3.3.1 Set time and date 28
3.3.2 Time and date format 29
3.3.3 Set AutoOff time 29
3.3.4 Adjust display contrast 30
3.3.5 Set display color 30
3.3.6 Beep activation 31
3.3.7 Introduction screen 31
3.3.8 Owner information 31
3.3.9 Lock configurations 33
3.3.10 Model upgrade license 34
3.3.11 Set factory defaults 35

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3.4
Measuring configuration options
36
3.4.1 Target ball selection 36
3.4.2 Set histogram range 37
3.4.3
Set histogram size
38
3.4.4 Set measuring mode 38
3.4.5 Measuring refresh rate 39
3.4.6
Select QSet button function
40
3.4.7 Select external pedal function 41
3.4.8 Configure send in RS232 41
3.4.9
Hold last measurement
42
3.4.10 EZ-Cal calibration editor 42
3.4.11 Probe information 43
Chapter 4 Using the Datalogger
4.1 Understanding how data is organized 44
4.2 Memory menu 45
4.3 Creating a new file 45
4.4 Actions over single files 46
4.4.1
View data in a single file
47
4.4.2 Use of the “Q” key in a grid 48
4.4.3 Use of the “Q” key in a histograma 49
4.4.4 Rename a file 49
4.4.5 Send data from a single file 50
4.4.6 View file size 50
4.5 Actions over all files 50
4.5.1 Send all files 50
4.5.2 Erase all files 51
4.6 Direct memory access (Mem key) 52
4.7 Connecting to a PC with DataCenter 53
4.8 Datalogger configuration 54
4.8.1 Configure communication 54
4.8.2 Search for Bluetooth device 55

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4.8.3
Show receiving Bluetooth device
56
4.8.4 Pair Bluetooth device 57
4.8.5 Data capture modes 57
4.8.6
Advanced memory config options
58
4.8.7 Store every X measurements 58
4.8.8 Enable or disable history 59
4.8.9
Configure time and date options
59
Apendix
Tips on how to measure correctly 60
Accuracy 61
Taking care of the probe 61
Technical specifications 62
Additional information 64
Unit maintenance 64
QB7 accessories 65
Error messages
67
Proper disposal 68
Our website: www.demeq.com 69
Technical support 69

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Thank you for choosing a dmq instrument
And thank you for purchasing a QB7 hall effect thickness gauge.
Company declaration
At Demeq we develop, manufacture and distribute software and
quality control instruments offering innovation and solutions that
come as a direct result of listening to your needs and demands as a
user. We apply some of the latest technology available in the industry
to build instruments that are robust, precise and easy to operate.
We are convinced that our products would not be complete without
permanent technical and after sales support. So in addition to quality
products we offer:
•Quick answers to your inquiries.
•Unlimited access to technical information as well as
application notes.
•Firmware and software upgrades at no charge.
•Attention to your inquiries and suggestions.
We hope that the QB7 will meet and exceed your application needs.

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General information
Models included in this manual
Information included in this manual applies to QB7 hall effect
thickness gauge models QB7 B and QB7 E.
Registered trademarks
dmq is a registered trademark of Demeq S.R.L and its affiliate
companies.
Important notice
The information contained in this manual is intended to educate
users on the operation of QB7 hall effect thickness gauges. Failure to
read and understand this manual can lead to measurement errors.
Decisions based on measurements and or results that are erroneous
can lead to property damage, personal injury or even death. Demeq
S.R.L assumes no responsibility as a result of improper use of our
instruments.
User training
Correct use of a QB7 hall effect thickness gauge requires that you
take all of the following into consideration:
•Select the sensor tip and target ball best suited for your
application.
•Know the specific requirements for the test you will be
conducting.
•Make sure that the person operating the unit has been
trained on its use.

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VII
This manual provides all of the information needed to configure and
operate a QB7 hall effect thickness gauge. However there are
additional factors that can affect tests done with this instrument.
Specific information on those factors is outside the scope of this
manual. When in doubt you should always seek expert advice or refer
to specific textbooks. Additional information can also be found on
the internet and through local government agencies as well as in
technical institutes.
Measuring principle
The QB7 uses a strong magnetic field to attract a steel or magnetic
ball that when reaching the tip of the probe affects its magnetic field.
Using a hall effect sensor the unit measures changes in the magnetic
field that are then converted to the thickness values seen on the unit
screen.
Figure 1: Details on the probe operation

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VIII
Probe accessories
Target balls
Each QB7 includes a calibration kit with the target ball diameters
needed to measure in the range for the QB7 model that you
purchased. Also included with the target balls are “zero” calibration
fixtures for each ball diameter.
Target balls used in the QB7
Part # Material Ball Diameter Range
QBR301 Steel 1,59 mm
1/16 inch
0 ~ 2.5 mm
0 ~ 100 mils
QBR302 Steel 3,18 mm
1/8 inch
0 ~ 5 mm
0 ~ 200 mils
QBR303 Steel 4,76 mm
3/16 inch
0 ~ 7 mm
0 ~ 280 mils
QBR304 Steel 6,35 mm
1/4 inch
0 ~ 8 mm
40 ~ 320 mils
QBR403
Magnetic
(*)
4,76 mm
3/16 inch
2 ~ 16 mm
80 ~ 640 mils
QBR404 Magnetic
(*)
6,35 mm
1/4 inch
4 ~ 22 mm
160 ~ 860 mils
Note
Target balls indicated with (*) are magnetic and will only
work with the QB7 E – extended range model while the
QB7 B model uses steel target balls only.

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The graph below shows ball diameters and their measuring ranges.
Figure 2: Target ball diameters vs measuring ranges
Note
The sensor QBS201 can be used with steel target balls
only while the sensor QBS301 can be used with both
steel and magnetic target balls (QB7 E model).

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Calibration fixtures
QB7 calibration kits include a set of calibration fixtures designed for
specific use with dmq sensors. Available calibration fixtures for
different steel target ball diameters are:
Calibration fixtures for steel target balls
Part # Thickness
QBR201 Zero cal fixture for 1.59 mm or 1/16" target ball
QBR202 Zero cal fixture for 3.18 mm or 1/8" target ball
QBR203 Zero cal fixture for 4.76 mm or 3/16" target ball
QBR101 Cal fixture with 0,25 mm (9,84 mils) shim
QBR102 Cal fixture with 0,50 mm (19,69 mils) shim
QBR103 Cal fixture with 1 mm (39.37 mils) ceramic block
QBR104 Cal fixture with 2 mm (78,7 mils) ceramic block
QBR105 Cal fixture with 4 mm (157.5 mils) ceramic block
QBR106 Cal fixture with 6 mm (236.2 mils) ceramic block
QBR107 Cal fixture with 8 mm (315 mils) ceramic block
Warning
If you use magnetic target balls with calibration fixtures
of 0.25 mm (9,84 mils) or 0.50 mm (19,69 mils) take
special care as the strength of the ball may damage the
calibration shims.
Calibration fixtures allow measurements of a known thickness while
positioning the target ball so that it remains stable and perpendicular
to the sensor tip in order to minimize measurement errors.
Figure 3 below shows how the calibration fixtures are used.

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Figure 3: Use of the calibration fixtures
First place the target ball inside the adapter (fig. 3-1) then place the
adapter with the target ball over the sensor (fig. 3-2), be careful
when doing this as the probe may attract the entire calibration
fixture abruptly to the tip of the sensor causing the calibration shims
to get damaged. Figure 3-3 shows the calibration fixture ready to be
used to calibrate the specific thickness value.
If you have an extended range model (QB7 E) additional calibration
fixtures are included for magnetic target balls.

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XII
Calibration fixtures for magnetic target balls
Part # Thickness Magnetic target ball
QBR108 10 mm (395 mils) 4,76 mm - 3/16 inch
6,35 mm - 1/4 inch
QBR109 14 mm (550 mils) 4,76 mm - 3/16 inch
6,35 mm - 1/4 inch
QBR110 18 mm (710 mils) 6,35 mm - 1/4 inch
QBR111 22 mm (860 mils) 6,35 mm - 1/4 inch
Important
Keep in mind that the QBR104 calibration fixture (2 mm
or 78,7 mils) is the “zero” for the 4,76 mm (3/16”)
magnetic target ball and the QBR105 calibration fixture
(4 mm or 157,5 mils) is the “zero” for the 6,35 mm
(1/4”) magnetic target ball.
Target ball selection
Special attention is needed when choosing the target ball size as a
correct selection will allow for easier operation and is important for
obtaining precise and reliable results. Here are some things to
consider when selecting the targer ball size that is best suited for
your application:
•Maximum expected test piece thickness
•What accuracy is required
•Minimum test piece curvature
•Material elasticity (because larger diameter balls generate a
higher force of attraction this may cause “softer” materials
to compress as a result of the force which will result in
erroneous or incorrect thickness values that are less than

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the real value).
•Hardness of the test piece surface as the surface may get
scratched with the use of magnetic target balls (unlike steel
target balls that turn, magnetic target balls are displaced
without turning) which may scratch the test piece surface
due to friction.
Using the sensor
Even though use of the hall effect sensor is pretty straight forward
certain considerations are needed to obtain accurate and repetitive
measurements.
What can affect measurements
QB7 sensors are highly sensitive devices that can be affected by
changes in the environment and other factors explained herein:
Changes in temperature and magnetic field
Using the QSet button (see page XV) you can adjust the sensor for
changes in temperature as well as for changes in the magnetic field
that may occur when the sensor is used without the sensor stand
(changes in the magnetic filed may occur when the sensor is used in
different positions).
Presence of ferrous or magnetic materials near the sensor
Hall effect sensors are highly sensitive to variations in the magnetic
field that can be affected by ferrous or magnetic elements in the
surroundings. So with the exception of the target ball make sure that
none of these elements are present when conducting measurements.
Surface roughness and or surface test piece finish
If the test piece surface has a rough or irregular finish the ball may
begin to oscillate as it is being displaced which will in turn result in
unstable measurements and in thickness values that are generally
higher than the real test piece thickness.

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Vertical surface measurements
When measuring vertical surfaces with high thickness values, the
target ball may fall off the center of the sensor tip due to gravity
which will in turn result in thickness values that are greater than the
real thickness of the test piece being measured.
Target ball is out of center
Another important factor that needs to be considered when
measuring is the position of the target ball as it relates to the sensor
tip. In order to obtain accurate measurements the target ball must be
aligned to the tip of the sensor as seen in the figure below.
Figure 4: Correct and incorrect ways of measuring
Figure 3 shows several alignment possibilities for the target ball
where this is the correct way of measuring because you can see
that the ball is perfectly alligned with the sensor tip. The rest of the
images show how not to measure:
: Error due to an inclined surface
: Error due a curved surface
: Error due to an obstruction in the surface
: Error due to an obstruction in the tip of the sensor

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Use of the sensor without the sensor stand
Because temperature is a factor that can affect measurements when
using the sensor without the sensor stand (handheld) we recommend
that the sensor be held from the bottom as seen in the figure below.
Figure 5: Holding sensor area when the sensor is handheld
The QSet button
The QSet button located in the QB7 sensor is
readily accessible so that you can compensate for
environmental changes (temperature and
magnetic field) quickly and easily. The QSet
button can also be set for additional functions as
explained in chapter 3.4.6, page 40.
When the QSet button is pressed the screen unit
will show a flashing coupling indicator meaning
that the sensor is being adjusted. This process
lasts a few seconds and ends as soon as the
coupling indicator remains static again.
Figure 6: QSet button

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XVI
Connecting the sensor to the unit
When the sensor is connected to the unit a
window is displayed showing sensor
information while an auto QSet adjustment is
executed in the background.
Figure 7: Window with sensor information
Important
When pressing the QSet button and or connecting the
sensor to the electronic unit make sure that the sensor
tip is away from ferrous elements or magnetic fields.
Important: Security information
QB7 hall effect thickness gauges are for industrial use only and must
not be used for medical applications or otherwise.
The QB7 operates with 2 rechargeable type AA cells so when
replacing these batteries make sure you do so using the same type
cells, current and polarity.
Precautions when using magnets
The following precautions should be taken into consideration when
using magnetic balls as well as the QB7 sensor because of the strong
magnetic field that the sensor has in order to attract steel balls when
measuring:
Do not bring magnets close to people that use pacemakers or other
type of implanted electronic devices as this may alter their normal
operation and put lives at risk!

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Keep magnets away from children and adults that suffer from mental
illnesses.
Do not burn rare earth magnets as they may release toxic vapors.
Do not bring magnets close to diskettes, hard disks, magnetic cards,
magnetic strips or any other storage device that is supported
magnetically as this may alter contents or erase them completely.
About software
Because software is complex in nature and it is never 100% error free
you should always check that the operations required for your
intended application are working correctly.
Warranty
Demeq provides a 3 year limited warranty on electronic units that is
automatically extended to 5 years when you register your unit while a
6 (six) month warranty is offered on probes.
Please remember to register your unit at:
http://www.demeq.com
Our limited warranty covers manufacturing and or material defects
only. Failure caused by accidents, normal wear of components or
improper use are not covered under warranty.
In the event that warranty service becomes necessary please contact
your local distributor or Demeq directly. We will solve your issue in
the shortest time possible and please remember that shipping
charges for warranty repairs or parts under warranty are always the
customer’s responsibility.