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