fafnir torrix Guide

Technical Documentation
FAFNIR GmbH • Schnackenburgallee 149 c • 22525 Hamburg • Germany • Tel.: +49 / 40 / 39 82 07-0 • F: +49 / 40 / 390 63 39
TORRIX
The magnetostrictive level sensor
Edition: 2020-04
Version: 19
Art. no.: 207074

I Contents
Table of contents
1Characteristics........................................................................................................ 1
2Safety instructions ................................................................................................2
3Design and function.............................................................................................3
4Installation ..............................................................................................................5
4.1 Installation with screw-in unit .......................................................................................................6
4.2 Installation with flange.....................................................................................................................7
4.3 Installation on the bypass ...............................................................................................................7
5Electrical connection ............................................................................................9
5.1 Wiring diagram TORRIX...................................................................................................................9
5.2 Wiring diagram TORRIX Ex .............................................................................................................9
5.3 Cable length.......................................................................................................................................10
5.4 Wiring …...............................................................................................................................................12
5.4.1 … with cable gland...........................................................................................................................12
5.4.2 … with M12 connection .................................................................................................................13
6Adjustment ...........................................................................................................14
6.1 Measuring span at the level sensor...........................................................................................14
6.2 Current consumption in failure mode......................................................................................15
7Maintenance.........................................................................................................17
7.1 Return shipment ...............................................................................................................................17
8Technical Data......................................................................................................18
8.1 Sensor...................................................................................................................................................18
8.2 Float.......................................................................................................................................................20
9List of figures .......................................................................................................21
10 Annex .................................................................................................................... 22

Contents II
10.1 EU Declaration of Conformity .....................................................................................................22
10.2 EU-Type Examination Certificate................................................................................................23
10.3 Instructions.........................................................................................................................................29
10.4 SIL 2 Certificate .................................................................................................................................36
10.5 SIL 2 Safety Manual.........................................................................................................................40
© Copyright:
Reproduction and translation are permitted only with the written consent of the FAFNIR GmbH. The FAFNIR GmbH
reserves the right to carry out product alterations without prior notice.

Page 1/44 Characteristics
1Characteristics
The high-precision TORRIX level sensor serves as continuous level measurement of liquid
media in containers. The measuring principle used by the sensor exploits the physical effect
of magnetostriction and is largely unaffected by temperature. This method is particularly
ideal where level measurements are required to be extremely accurate, such as in the chem-
ical industry.
This documentation describes the TORRIX with cable connection on the side of the probe
head. The cable connection is an M12 cable gland (or M16 x 1.5 adapter), an M12 male
connector, or an M20 resp. ½in NPT female thread.
Another version is the TORRIX M12 with an M12 male connector on top of the probe head
cover, see:
Technical documentation TORRIX M12, art. no. 350164
The TORRIX supplies a 4 … 20 mA output signal that is configured using buttons in the probe
head, or a digital output signal as HART®protocol. Probe lengths are possible from 100 mm
to 6 m, as Flex version up to 22 m, as well as versions for different temperature and pressure
ranges.
It also comes in the following versions:
•TORRIX (with screw-in unit, welded or for stepless positioning)
•TORRIX flange (with process connection flange)
•TORRIX Flex (with flexible probe tube)
•TORRIX Bypass (for installation on a bypass with magnetic float)
•TORRIX 90 (with 90° angled probe head)
•TORRIX 6 (with 6 mm probe tube)
•TORRIX 6B (with 6 mm probe tube and short cable gland)
For the description of the communication with the HART®protocol, see:
Technical documentation TORRIX Hart, art. no. 207095
For the installation of the TORRIX Flex probe, see:
TORRIX Flex Installation Guide multilingual, art. no. 350118
The TORRIX versions can also be supplied as Ex version:
The TORRIX Ex … level sensor with Ex approval (ATEX, IECEx) can be installed in potentially
explosive areas which require equipment protection level Ga (Ex Zone 0), Ga/Gb (Ex Zone 0/1)
or Gb (Ex Zone 1) for electrical equipment.

Safety instructions Page 2/44
2Safety instructions
The TORRIX level sensor is intended for level measurement of liquids in containers. The level
sensor must be used exclusively for this purpose. The manufacturer accepts no liability for
any form of damage resulting from improper use.
The level sensor has been developed, manufactured and tested in accordance with the latest
good engineering practices and generally accepted safety standards. Nevertheless, hazards
may arise from its use. For this reason, the following safety instructions must be observed:
•Do not change or modify the level sensor or add any equipment without the prior
consent of the manufacturer.
•The installation, operation and maintenance of the level sensor must be carried
out only by expert personnel. Specialised knowledge must be acquired by regular
training.
•Operators, installers and service technicians must comply with all applicable safety
regulations. This also applies to any local safety and accident prevention regulations
which are not stated in this user guide.
The safety instructions in this user guide are marked as follows:
If these safety instructions are not observed, it may result in the risk of accident
or damages to the TORRIX level sensor.
Useful information which ensures continued and correct operation of the
TORRIX level sensor and makes your work easier.

Page 3/44 Design and function
3Design and function
The design of the TORRIX level sensor is illustrated in the version with screw-in unit (see
following figure).
Inside probe head (1) of the level sensor, concealed by cap (2), are the protected terminal
clamps and configuration buttons. The electrical connection is made on the side of the probe
head via an M12 cable gland (or M16 x 1.5 adapter), an M12 male connector, or an M20
resp. ½in NPT female thread and at the bottom of the probe head by the earth connection
(4) (see chapters “Installation” and “Adjustment”).
On the probe tube (5) is a screw-in unit (6) (cutting ring fitting or ferrule fitting) for height-
adjustable mounting in the container or a flange for fixed installation (not shown). The float
(7) serves for continuous measurement of the product filling level or interface level and is
held on the probe tube by an adjusting ring (8).
The TORRIX Bypass version is supplied without a process connection and a float.
Figure 1: TORRIX level sensor
1
4
5
6
7
2
3
8

Design and function Page 4/44
The measuring principle illustrated in the following figure exploits the physical effect of
magnetostriction and is largely unaffected by temperature. The probe tube contains a ten-
sioned wire (1) made of magnetostrictive material. By the sensor electronics current pulses (2)
are sent through the wire, which generate a circular magnetic field (3). A magnet (4) inside
the float acts as the filling level sensor. Its magnetic field applies an axial magnetic field to
the wire. The superposition of the two magnetic fields produces a torsional wave (5) at the
float position, which then propagates along the wire in both directions. One wave propa-
gates directly to the probe head, the other propagates down to the bottom of the probe
tube and is reflected. The time between the current pulse being transmitted and the wave
arriving at the probe head is measured. From these propagation times, it is possible to de-
termine the current position of the float.
Figure 2: Operating principle of the TORRIX level sensor
1 – Magnetostrictive wire
2 – Current pulses
3 – Circular magnetic field
4 – Magnet
5 – Torsion wave
②
①
③
⑤
④
⑤

Page 5/44 Installation
4Installation
When installing and maintaining the level sensor in potentially explosive areas,
the national rules must be observed (Explosion Protection Regulations, Indus-
trial Health and Safety Regulations, Equipment Safety Regulations and specific
conditions of the EU-Type Examination Certificates). The generally accepted
rules of engineering and these operating instructions must be observed.
All applicable local safety and accident prevention regulations not included in
this manual must also be observed.
This section describes how to install the level sensor depending on the type (see following
figure).
TORRIX screw-in unit TORRIX flange TORRIX Bypass
Figure 3: TORRIX versions
Probe length
Probe head
Probe head
Screw-in unit
Probe tube
ø 12
Probe tube
ø 12
Float
Adjusting
ring
Adjusting
ring
Float
Flange
Neck tube
Probe length
Installation length
112
∅50
∅50
∅50
112
116
88

Installation Page 6/44
During installation, take great care not to bend the probe tube, and protect
the float from shock and impact loads.
Installing a level sensor in areas exposed to a powerful external magnetic field
is not permitted because this could impair gauging.
The level sensor can also be fitted into containers from underneath. If the con-
tainer additionally is pressurized, then the maximum length of the level sensor
is 2 m.
If the float is removed during installation, it must be slid back onto the probe
tube afterwards with the “TOP” marking oriented towards the probe head to
enable correct measurements.
4.1 Installation with screw-in unit
Figure 4: Installation with screw-in unit
Removing the float is necessary only if the float does not fit through the
mounting hole in the tank. Otherwise, please proceed directly to steps 3, 6
and, if applicable, 7.
Insert the level sensor into the container (see Figure 4):
(1) Loosen both set screws, remove adjusting ring (1) and float (2) from the probe tube (3).
(2) If necessary, slot screw-in unit (4) onto the probe tube.
(3) Insert the level sensor into the tank, provide screw-in thread (4) with a suitable seal-
ing material, screw it in and tighten.
(4) Slide float (2) back onto probe tube (3).
For correct measurement, the float must be slid onto the probe tube with the
“TOP” marking oriented towards the probe head.
1
2
3
4
5

Page 7/44 Installation
(5) Refit adjusting ring (1) on the tube, align the set screws with the groove and
tighten.
(6) Adjust the height of the process connection and fix the union nut (5) by hand
finger-tight.
(7) Fix the union nut (5) with a wrench by a 1¼ clockwise turn (see following figure).
Figure 5: Tightening the compression fitting
4.2 Installation with flange
The probe tube is firmly welded to the flange, so the installation length cannot be changed.
Fasten flange and seal with the flange bolts or nuts. The bolts or nuts and the seals are the
responsibility of the operating company and must be selected depending on the fluid. The
fasteners and seals must comply with the requirements of the standards EN 1092-1, EN 1514
and EN 1515.
If the float does not fit through the mounting hole, see installation instructions, chapter 4.1.
4.3 Installation on the bypass
The level sensor is mounted at the side of the bypass tube using suitable non-magnetic
fasteners.
To ensure reliable gauging, the probe tube must be fitted with no deformation
on the outside.
The distance between the probe and bypass tubes must be as small as possible.
Only floats approved by FAFNIR can be used.
5

Installation Page 8/44
Figure 6: Installation on the bypass
montiert (unverformt)
Magnetposition
min.
max.
Magnetposition
Magnetposition
Bypassrohr
TORRIX Bypass
Sondenrohr spannungsfrei
Bypass-Schwimmer
70 min. Messbereich
Schwimmermitte: max. Abstand
abhängig vom Bypass-Schwimmer
Abstand Sondenrohr zu
50 min.
Sondenlänge
AA
SCHNITT A-A
Abstandshalter
Sondenbefestigung
(unmagnetisch)
Distance between probe tube
and float centre: max. distance
depends on the bypass float
Bypass float
Probe tube tension-
free
mounted (undeformed)
Bypass tube
Magnet position
Spacer
Probe fixture
(non-magnetic)
Probe length
max.
Magnet position
min.
Magnet position
Measuring range
Section A-A
TORRIX Bypass

Page 9/44 Electrical connection
5Electrical connection
5.1 Wiring diagram TORRIX
The level sensor without Ex approval is installed according to the following wiring diagram:
Figure 7: Wiring diagram TORRIX
Power supply: Umax = 30 V DC
Minimum supply voltage: Umin = 8 V
Permissible total resistance (including cable resistance and load): ΣR = (U - Umin) / 0.0215 A
For connection of the cable, see chapter 5.4
5.2 Wiring diagram TORRIX Ex
The level sensor with Ex approval is installed in a potentially explosive atmosphere
according to the following wiring diagram:
Figure 8: Wiring diagram TORRIX Ex
Power supply: Umax = 30 V DC
Minimum supply voltage: Umin = 8 V
Permissible total resistance (including cable resistance and load): ΣR = (U - Umin) / 0.0215 A
+
+
_
Y
I
R1
R2
R3
U
TORRIX Spannungsquelle
LeitungswiderständeBürde
U= 30 V
max
U = 8 V
min
Y
I
+
-
R1
R2
TORRIX (Ex-Ausführung)
Leitungswiderstände
Trennverstärker (Beispiel)
Hilfsenergie
4...20 mA
+
-
4...20 mA
8...30 V
Power supply
Line resistance
Load
Isolating amplifier (example)
Line resistance
Power supply
(Ex version)

Electrical connection Page 10/44
The intrinsically safe version of the TORRIX Ex level sensor, when installed in a
potentially explosive atmosphere, is permitted to be connected only to isolating
amplifiers that have been certified by a recognised inspection authority and offer
electrical outputs that meet the following conditions:
U0≤30 V
I0≤200 mA
P0≤1 W
Further data can be found in the EU-Type Examination Certificate (see Annex).
If the level sensor is to be used in a potentially explosive atmosphere, always
make sure that the permissible external capacitance (C0) and inductance (L0)
of the isolating amplifier are not exceeded (refer to the electrical data in the
EU-Type Examination Certificate).
Used in an explosion-proof application, the connecting cable to the isolating amplifier
must be marked, preferably as a blue cable for intrinsically safe electric circuits.
For connection of the cable, see chapter 5.4
5.3 Cable length
The maximum cable length depends on the total resistance (see chapter 5.1/5.2), composed
of the line resistances and the load of connected devices.
The cable (length and cross-section) must be chosen so that the supply voltage
will not fall below the sensor-specific minimum voltage (8 V) in the event of a
maximum current consumption (21.5 mA).
If the level sensor is to be used in a potentially explosive atmosphere, always
make sure that the permissible external capacitance (C0) and inductance (L0)
of the associated equipment are not exceeded (refer to the electrical data in
the EU-Type Examination Certificate).
Because of the voltage drop of 12 V the connection housing HPH Ex d and the
safety barrier SB1 can be used with TORRIX only at a supply voltage higher
than 20 volts.

Page 11/44 Electrical connection
The following table shows the maximum total resistances at different supply voltages, and
cable resistances at various cross-sections:
Supply volt-
age [V]
Max. total re-
sistance [Ω]
Cable cross-
section
[mm²]
Cable resistance
per m copper cable
[Ω/m]
For connection
housing HPH Ex d
suitable (yes/no)
12 (-5%)
158
0.5
0.0356
no
1.0
0.0178
no
1.5
0.0119
no
24 (-5%)
688
0.5
0.0356
Yes
1.0
0.0178
Yes
1.5
0.0119
Yes
The max. cable length is calculated as follows:
L = (((U – Umin) / Imax) –RB) / RQ
L = Cable length [m]
U = Supply voltage [V] (with negative tolerance value -5%)
Umin = Minimum supply voltage [V] = 8 V
Imax = Maximum power consumption [A] = 0,0215 A
RB= Load
RQ= Cable resistance per m copper cable [Ω/m] at cable cross-section Q [mm²]
Example:
Supply voltage 12 V (± 5%)
Supply voltage U = 11.4 V (12 V - 5%)
Minimum supply voltage Umin = 8 V
Maximum power consumption Imax = 0.0215 A
Load RB = 86,8 Ω
Cable resistance per m copper cable RQ= 0.0356 Ω/m with cable cross-section Q = 0.5 mm²
L = (((11,4 – 8) / 0,0215) -86,8) / 0,0356 = 2000 m
Thus a cable with forward and return line (2-wire) can be up to 1000 m long.

Electrical connection Page 12/44
5.4 Wiring …
5.4.1 … with cable gland
The wiring must be carried out only with the power disconnected.
For the wiring of the level sensor, proceed as follows:
(1) Unscrew probe head cover (1) using an open-ended spanner.
(2) Loosen union nut (2) of screwed cable gland (3).
Figure 9: Wiring
Figure 10: Removable screw terminal
(3) Feed the two-core cable (4) into the union nut (2) and tighten the nut. The outside
diameter must be 5 to 10 mm.
(4) Remove screw terminal (5).
(5) Connect the two-core cable (4) to the (+) and (–) marked pols of the screw terminal (5).
(6) Plug the screw terminal (5) back on. The cable must have no traction!
(7) If necessary, set reference points (see chapter 6.1).
(8) Screw probe head cover (1) back on.
The earth connector on the underside of the probe head can be used for earthing or equi-
potential bonding.
1
3
2
4
Cal/Err
+
4 mA 20 mA
–
3
2
4
5
5

Page 13/44 Electrical connection
Protect the probe head against the ingress of water. An external cable diameter
of 5 to 10 mm ensures reliable sealing of the cable entry. Make sure that the
cable glands and the probe head cover are screwed tight.
5.4.2 … with M12 connection
The wiring must be carried out only with the power disconnected.
•If not already connected, plug the M12 female connector of the FAFNIR connec-
tion cable onto the M12 male connector of the probe head. First tighten the un-
ion nut of the M12 female connector by hand and then use an open-ended
spanner to tighten the nut further 180°. The tightening torque should be be-
tween 100 … 150 Ncm.
•Connect the cable coming from the central unit with the FAFNIR connection cable,
for example using an installation sleeve, in the following pin assignment:
Signal Colour coding
of FAFNIR ca-
bles
Assignment
of
the M12 fe-
male con-
nector
Voltage
+
brown
Pin 1
not used
white
Pin 2
Voltage
–
blue
Pin 3
not used
black
Pin 4
Pin assignment of the M12 female connector of the FAFNIR connection cable
The connection cable between the TORRIX … and the associated equipment must have the
following properties:
•2-wire unshielded cable
•For Ex applications colour blue or marked blue (cable for intrinsically safe power
circuits)
The earthing or equipotential bonding must be carried out by the installer in
accordance with the respective national installation regulations. The earth
connector of the probe head can be used for earthing or equipotential bonding
requirements.
Also observe the general installation regulations.
Pin 4
Pin 1
Pin 2
Pin 3

Adjustment Page 14/44
6Adjustment
The settings described below can also easily be performed remotely for ver-
sions with HART®protocol without the probe head having to be opened.
6.1 Measuring span at the level sensor
To enable configuration of the 4 mA and 20 mA points at the TORRIX level sensor, two but-
tons and an LED (light emitting diode) are provided near the terminals inside the probe
head.
By default, the level sensor is set to maximum measuring span with 4 mA at the sensor base
and 20 mA at the probe head. The measuring span is configurable for adaptation to the tank
concerned. However, a minimum clearance of 10 mm must be observed.
If this minimum clearance is not observed, the display direction of the level sensor will be
reversed automatically (ullage measurement).
Through configuration, it is also possible to have the measured value output inverted: e.g.
the level sensor can be set to maximum measuring span with 4 mA at the probe head and
20 mA at the sensor base.
Figure 11: Adjustment of the measuring span
(1) Unscrew probe head cap (1) using an open-ended spanner.
(2) Press and hold 4 mA button (2) or 20 mA button (3) for at least 3 seconds. The green
LED begins to flash.
(3) The level sensor is now in configuration mode. The current consumption of the level
sensor is 12 mA. If no button is pressed again, the level sensor remains in configu-
ration mode for 20 seconds before reverting to measuring mode and discarding
any changes. In configuration mode, the 4 mA or 20 mA reference point, or both,
can be modified in any order.
1
+
4 mA 20 mA
–
3
4Cal/Err
2

Page 15/44 Adjustment
To define a reference point:
(4) Move the float to the desired reference point and
−briefly press (0.1 to 2 seconds) the “4 mA” button (2) to define a current consump-
tion of 4 mA at this position
−briefly press (0.1 to 2 seconds) the “20 mA” button (3) to define a current con-
sumption of 20 mA at this position
When the “4 mA” button is pressed, the LED goes out for 5 seconds. When the “20 mA”
button is pressed, the LED lights up permanently for 5 seconds.
The sensor then remains in configuration mode for a further 15 seconds before storing the
change and reverting to measuring mode.
The new measuring range configuration is not stored until the level sensor re-
verts automatically from adjustment mode to configuration mode and the LED
goes out. The new configuration is retained even if the level sensor is subse-
quently disconnected from the power supply.
For “dry” settings to be possible in the case of bypass sensors, a magnetic sys-
tem with spacer bracket will need to be obtained from the manufacturer of the
bypass. Configuration can then be carried out even with the sensor removed.
6.2 Current consumption in failure mode
If a malfunction is preventing the level sensor from recording a plausible float position, i.e.
the measured level is incorrect, the sensor will enter the failure mode after a short time.
Failure mode signalling conforms to the NAMUR NE43 recommendation. The failure cur-
rent is set by default to 21.5 mA but this value can also be set to 3.6 mA.
To configure the current consumption in failure mode (see Figure 11).
(1) Unscrew probe head cap (1) using an open-ended spanner.
(2) Press and hold both the “4 mA” (2) and “20 mA” (3) simultaneously for at least 3
seconds.
Green LED (4) “Cal/Err” flashes rapidly. The current consumption of the level sen-
sor is 16 mA. After 5 seconds, the LED stops flashing and indicates the selected
failure current consumption for 2.5 seconds. If the LED is on permanently, Ifailure is
21,5 mA, if the LED turns off, Ifailure is 3,6 mA.
If no button is pressed again, the level sensor remains in failure mode for a further
2.5 seconds before reverting to measuring mode and discarding any changes.
(3) To set a current consumption
−of 3.6 mA during the dwell time (10 sec) in the failure mode, briefly press the "4
mA" (2) button (0.1 … 2 seconds).
−of 21.5 mA during the dwell time (10 sec) in the failure mode, briefly press the "20
mA" (3) button (0.1 … 2 seconds).

Adjustment Page 16/44
The new measuring range configuration is not stored until the level sensor re-
verts automatically from adjustment mode to configuration mode and the LED
goes out. The new configuration is retained even if the level sensor is subse-
quently disconnected from the power supply.
(4) Screw probe head cap (1) back on.
If, during operation, the level sensor detects that the level cannot be output
correctly due to an insufficient supply voltage, it enters failure mode and sets
current consumption to 3.6 mA (regardless of any failure current settings).

Page 17/44 Maintenance
7Maintenance
7.1 Return shipment
Before returning any FAFNIR equipment the Return Material Authorization (RMA) by the
FAFNIR customer support is required. Please contact your account manager or the customer
service to receive the instructions on how to return goods.
The return of FAFNIR equipment is possible only with authorization by the
FAFNIR customer service.