sewerin FerroTec FT 10 User manual

20.04.2016 a – 107340 – en
FerroTec FT 10
Operating instructions

Structure
Fig. 1: FerroTec FT 10 – Handle as seen from above (top left), handle as seen
from below (bottom left), side view (right)
Display
Sensor area
Arrow-up key
Arrow-down key
Zero point key
Menu key
ON/OFF key
Handle
Pipe
Charging socket
Loudspeaker

Display
Symbols in the symbol areas
Symbol Signicance
Loudspeaker Loudspeaker on
Loudspeaker off
Battery Battery full
Battery at
Sensitivity display Highest sensitivity
Lowest sensitivity
Alternating eld Warning of live cables
Sensitivity boost BSensitivity boost enabled
Fig. 2: Display with aiming circle view
Fig. 3: Display with bar view
Symbol area
Current locating value
Current locating intensity (bar)
Symbol area
Current locating intensity
(aiming circle)
Strength of alternating eld (bar)
Symbol area
Current locating value
Symbol area

Information about this document
The warnings and notes in the document mean the following:
WARNING!
Risk of damage to property.
Note:
Tips and important information.
Enumerated lists (numbers, letters) are used for:
● instructions that must be followed in a specic sequence
Bullet lists (bullet points, dashes) are used for:
●lists
●instructions comprising only one action

I
Contents Page
1 Introduction .............................................................................1
2 Notes on handling the product ..............................................2
2.1 Warranty....................................................................................2
2.2 Intended use .............................................................................2
2.3 General safety information ........................................................3
3 Product description ................................................................4
3.1 Setup.........................................................................................4
3.2 Power supply.............................................................................4
3.3 Operating mode ........................................................................4
3.4 Playing back signals..................................................................5
3.4.1 Display on the screen.............................................................5
3.4.2 Audible ...................................................................................6
3.5 Alternating eld display (warning of live cables) .......................6
3.6 Sensitivity ..................................................................................6
3.7 Zero point ..................................................................................7
3.8 Automatic power off...................................................................8
3.9 Display backlight .......................................................................8
4 Locating objects......................................................................9
4.1 Handling the magnetometer during location ............................9
4.2 Signals dependent on the position and size of an object ........10
4.3 Factors inuencing the location results ...................................12
4.3.1 Size of an object...................................................................12
4.3.2 Sources of interference ........................................................14
5 Operation ...............................................................................15
5.1 Switching the magnetometer on and off..................................15
5.2 Changing the sensitivity ..........................................................17
5.3 Setting the zero point ..............................................................17
5.4 Listening to the audible signal (beep) .....................................18
5.4.1 In hold mode ........................................................................18
5.4.2 In toggle mode .....................................................................18
5.5 Settings ...................................................................................19
5.5.1 SETUP menu .......................................................................19
5.5.2 Changing settings ................................................................19

II
Contents Page
6 Maintenance ..........................................................................21
6.1 Charging the batteries.............................................................21
6.2 Care ........................................................................................22
6.3 Servicing .................................................................................22
6.4 Solving problems.....................................................................23
6.4.1 Troubleshooting....................................................................23
6.4.2 Error messages....................................................................24
7 Appendix................................................................................25
7.1 Technical data .........................................................................25
7.2 Factory default settings ...........................................................27
7.3 EU declaration of conformity ...................................................27
7.4 Advice on disposal ..................................................................27
8 Index.......................................................................................28

1
1 Introduction
1 Introduction
The FerroTec FT 10 is a magnetometer used to locate concealed
ferromagnetic objects (steel, iron, cast iron).
There are two sensors in the magnetometer. These respond to
changes in the earth’s magnetic eld caused by ferromagnetic
materials.
Changes to the earth’s magnetic eld only reach full strength
days or even weeks after the object’s last movement. That is why
objects which have been in the ground for a long time are easier
to locate than objects that have been placed on the ground, for
example, for a trial detection.
Non-ferrous metals do not interfere with the detection process as
they are not ferromagnetic.
The magnetometer warns of live cables with a symbol on the
display.
Fig. 4: Magnetic eld lines of an object in the ground (cross section).
The two sensors (A and B) record different magnetic eld lines
(signals). The magnetometer locates the object based on the
signal difference.

2
2 Notes on handling the product
2 Notes on handling the product
2.1 Warranty
The following instructions must be complied with in order for any
warranty to be applicable regarding functionality and safe oper-
ation of this equipment.
●Read these operating instructions prior to operating the prod-
uct.
●Use the product only as intended.
●Repairs and maintenance must only be carried out by special-
ist technicians or other suitably trained personnel. Only spare
parts approved by Hermann Sewerin GmbH may be used
when performing repairs.
● Changes or modications to this product may only be carried
out with the approval of Hermann Sewerin GmbH.
● Use only Hermann Sewerin GmbH accessories for the product.
Hermann Sewerin GmbH shall not be liable for damages re-
sulting from the non-observance of this information. The war-
ranty conditions of the General Terms and Conditions (AGB) of
Hermann Sewerin GmbH are not broadened by this information.
In addition to the warnings and other information in these Oper-
ating Instructions, always observe the generally applicable safety
and accident prevention regulations.
The manufacturer reserves the right to make technical changes.
2.2 Intended use
The FerroTec FT 10 can be used to locate ferromagnetic objects
(steel, iron, cast iron). In particular, the magnetometer is intended
for locating sliding rods, manhole covers, metal pit covers, pave-
ment markers and magnetic markers.

3
2 Notes on handling the product
2.3 General safety information
This product was manufactured in keeping with all binding legal
and safety regulations. It corresponds to the state-of-the-art and
conforms to EC requirements. The product is safe to operate
when used in accordance with the instructions provided.
However, if you handle the product improperly or not as intended,
the product may present a risk to persons and property. For this
reason, always observe the following safety information.
Risk of personal injury (health risk)
● Handle the magnetometer carefully and safely both during
transport and when working. The pipe in particular could cause
harm to yourself or others.
●Proceed with extreme caution in the vicinity of electrical lines.
Hazards for the product and other property
● Always handle the magnetometer with care. Only use the mag-
netometer as intended.
●Do not drop the magnetometer. Always set the magnetometer
down carefully.
●Do not lean on the magnetometer.
●Do not immerse the magnetometer pipe more than 610 mm
deep in liquids.

4
3 Product description
3 Product description
3.1 Setup
For overviews including all part names for the FerroTec FT 10 ,
see the front cover ap (Fig. 1).
3.2 Power supply
The product is powered by special inbuilt NiMH rechargeable
batteries. Only SEWERIN service personnel or other authorised
specialists may replace the rechargeable batteries.
For information on charging the batteries see section 6.1 on
page 21.
3.3 Operating mode
The operating mode determines how the sensor area operates.
Note:
The selected operating mode only affects the switching on and
off of the beep.
You can choose between two operating modes.
●Hold mode
Place your thumb on the sensor area to listen. When you re-
move your thumb from the sensor area, the beep goes off.
●Toggle mode
To listen, briey press the sensor area with your thumb. If you
briey touch the sensor area with your thumb again, the beep
will switch off.
The operating mode is set in the menu under MODE.Informa-
tion about changing the setting can be found in section 5.5.2 on
page 19.
Information about how to enable the audible signals in both oper-
ating modes can be found in section 5.4 on page 18.

5
3 Product description
3.4 Playing back signals
3.4.1 Display on the screen
The elements shown on the screen are explained inside the front
cover (Fig. 2 and Fig. 3). Some elements are always visible, oth-
ers only in certain operating or locating situations.
The location of an object is displayed on the screen in two ways
simultaneously:
●numerically
●visually
The point of reference in both display types is the last zero point
setting.
Numerical display
The current locating value is displayed as a number.
−As the magnetometer moves closer to the object, the locating
value increases.
− As the magnetometer moves away from the object, the locating
value decreases.
Visual representation
You can choose between two types of visual representation.
●Aiming circle view
− As the magnetometer moves closer to the object, the aiming
circle gets bigger.
−As the magnetometer moves away from the object, the aim-
ing circle gets smaller.
−If there is no object in the locating area, the aiming circle is
not displayed.
●Bar view
The bar starts in the centre and moves to the left or right.
−If there is no object in the locating area, the bar is not dis-
played.

6
3 Product description
You can set the type of visual representation in the menu under
VIEW. Information about changing the setting can be found in
section 5.5.2 on page 19.
3.4.2 Audible
In addition to the on-screen display, you can also use an audible
signal (beep) to locate objects. The beep sounds from the inte-
grated speaker.
−As the magnetometer moves closer to the object, the interval
between the individual beeps gets shorter.
− As the magnetometer moves away from the object, the interval
between the individual beeps gets longer.
Information on listening to the audible signal can be found in
section 5.4 on page 18.
3.5 Alternating eld display (warning of live cables)
The magnetometer automatically warns of live cables. If there
is a live cable in the locating area, the alternating eld symbol
appears on the screen.
The strength of the alternating eld is also indicated by a bar in
the aiming circle view.
−As the magnetometer moves closer to a live cable, the gauge
of the alternating eld display will increase.
Note:
The strength of the alternating eld is only shown in the aiming
circle view.
3.6 Sensitivity
The sensitivity setting for the magnetometer is displayed on the
screen. The more segments that are visible in the sensitivity dis-
play, the greater the sensitivity.
The sensitivity must always be adjusted to the current locating
scenario.

7
3 Product description
●The sensitivity can be increased for locating deep or smaller
objects.
●If smaller objects are adversely affecting the location of larger
objects, you can reduce the sensitivity.
The magnetometer features a sensitivity boost. The sensitivity
boost can be switched on if the locating scenario requires a very
high level of sensitivity.
Information about changing the sensitivity setting and activating
the sensitivity boost can be found in section 5.2 on page 17.
3.7 Zero point
The zero point is the value at which a current, actual value is set
to zero (offset). When the magnetometer is switched on, the zero
point is set automatically.
You can manually reset the zero point again any time during the
locating process. SEWERIN recommends this especially at the
start of every new locating procedure.
Information on setting the zero point can be found in section 5.3
on page 17.

8
3 Product description
3.8 Automatic power off
The magnetometer has an automatic power off feature. This re-
duces the power consumption of the inbuilt rechargeable bat-
teries and prevents them from being damaged by undervoltage.
The magnetometer automatically switches off in the following
situations:
●The magnetometer is not operated for 20 minutes, i.e. no key
is pressed and the sensor area is not touched. AUTO POWER
OFF appears briey on the screen during shutdown.
●The remaining battery capacity is too low. BAT LOW appears
briey on the screen during shutdown.
Fig. 5: Automatic power off
Magnetometer is not operated for 20 minutes (left)
The remaining battery capacity is too low (right)
3.9 Display backlight
The magnetometer features an illuminated display. The display
automatically lights up when a key is pressed or the sensor area
is touched. The display remains illuminated for 20 seconds.
The display illumination can be deactivated. When the display
illumination is deactivated, operating time is extended.
The display illumination is disabled or enabled in the menu un-
der LED.Information about changing the setting can be found in
section 5.5.2 on page 19.

9
4 Locating objects
4 Locating objects
4.1 Handling the magnetometer during location
Note the following points to ensure that the locating process is
successful:
●Reduce the impact of sources of interference as much as pos-
sible. Information about sources of interference can be found
in section 4.3.2 on page 14.
●Hold the magnetometer above the surface as upright as pos-
sible1.
●Hold the magnetometer away from your body.
●Hold the magnetometer steady. Do not swing the magnetom-
eter back and forth.
●Start the locating procedure with low sensitivity. Then adjust
the sensitivity to suit the locating conditions.
1Usually: earth’s surface

10
4 Locating objects
4.2 Signals dependent on the position and size of an object
The beep usually reaches its maximum directly above the object.
The display can show positive or negative values.
This applies to objects with the following position and size:
●objects in a vertical position (Fig. 6)
●small objects in a horizontal position
1
3
2
4
1
3
2
4
Fig. 6: Object in a vertical position (cross section) – Possible location
results
1 audible signal (beep), 2 aiming circle view, 3 bar view, 4 locat-
ing value

11
4 Locating objects
There are two maximum points for objects lying horizontally in
parallel to the earth’s magnetic eld. The maximum points occur
at each end of the object (Fig. 7). One of the maximum points is
positive, the other is negative.
1
3
2
4
Fig. 7: Large object lying horizontally in parallel to the earth’s magnetic
eld.
1 audible signal (beep), 2 aiming circle view, 3 bar view, 4 locat-
ing value

12
4 Locating objects
Objects, that are long and very narrow and horizontal but per-
pendicular to the earth’s magnetic eld, show just one maximum
point in practice (Fig. 8).
1
Fig. 8: Large object lying horizontally and perpendicular to the earth’s
magnetic eld.
1 audible signal (beep)
4.3 Factors inuencing the location results
4.3.1 Size of an object
The magnetometer can also be used to locate small objects,
for example, nails and screws. The size of an object, however,
affects the display.
The following applies to small objects:
● As the magnetometer moves away from an object, the locating
value and the locating intensity decrease more sharply than
with larger objects.

13
4 Locating objects
● If the distance between the magnetometer and surface2in-
crease without the sensitivity changing, it is more difcult and
maybe even impossible to locate the object (Fig. 9).
●The maximum area is narrower than with larger objects.
Note:
● You can use these effects to help you specically locate small
or large objects.
● Vary the sensitivity and the distance of the magnetometer from
the surface according to the size of the object you are search-
ing for.
1
Fig. 9: Locating small and large objects with the same sensitivity.
The distance of the magnetometer varied from the surface (cross
section).
1 audible signal (beep)
2Usually: earth’s surface

14
4 Locating objects
4.3.2 Sources of interference
All ferromagnetic objects generate interference elds. Interfer-
ence elds can make it more difcult to locate an object.
Interfering objects include for example:
●Steel fences, gratings
●Vehicles
●Safety shoes with steel toecaps
●Bunches of keys
●Mobile phones
●Iron jewellery (e.g. belt buckles)
Note:
Reduce the number of sources of interference that you yourself
have control over.
●Carry as few sources of interference on your body as possible
(keys, mobile phone etc.).
●Wear safety shoes with toecaps made of aluminium or plastic.
If you cannot avoid wearing magnetic objects on your body:
●Hold the magnetometer as far away from your body as pos-
sible.
If there are large immovable sources of interference at the locat-
ing area (e.g. steel fences ), the following measures might help:
●Set the sensitivity low.
●Perform locating without the sensitivity boost.