fafnir torrix Guide

Technical Documentation
FAFNIR GmbH •Schnackenburgallee 149 c •22525 Hamburg •Germany •Tel.: +49 /40 / 39 82 07-0 •Fax: +49 /40 / 390 63 39
TORRIX
The magnetostrictive level sensor
Edition: 2016-09
Version: 16
Art. no.: 207074

I Table of contents
Table of contents
1Overview................................................................................................. 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
6User configuration ............................................................................... 13
6.1 Measuring span at the level sensor ...................................................................13
6.2 Current consumption in failure mode ...............................................................15
7Maintenance......................................................................................... 16
7.1 Return shipment...............................................................................................16
8Technical data....................................................................................... 16
8.1 Sensor..............................................................................................................16
8.2 Float ................................................................................................................18
9List of figures........................................................................................ 19
10 Annex.................................................................................................... 20
10.1 EC Declaration of Conformity...........................................................................20
10.2 SIL Certificate...................................................................................................21
10.3 EC type-examination certificate TÜV 01 ATEX 1772 X.......................................24
10.3.1 1st Supplement................................................................................................27

Table of contents II
10.3.2 2nd Supplement...............................................................................................28
10.3.3 3rd Supplement ...............................................................................................29
10.3.4 4th Supplement ...............................................................................................30
10.4 Instructions ......................................................................................................34
© Copyright:
Reproduction and translation is 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 1/36 Overview
1Overview
The high-precision TORRIX level sensor is designed to provide continuous gauging of
liquid media levels in tanks. 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 chemical industry.
In this documentation, the TORRIX is described as the variant with cable gland. As
another option, the TORRIX with plug connector is available, see:
Technical documentation TORRIX M12, art. no. 350164
The TORRIX supplies a 4 ... 20 mA output signal which is configured using buttons in the
sensor head, or a digital output signal as HART®protocol. Probe lengths are possible from
100 mm to 6 m, as Flex version up to 10 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 sensor head)
•TORRIX 6 (with 6 mm probe tube)
•TORRIX 6B (with 6 mm probe tube and short cable gland)
For the description of communication with the HART®protocol, see:
Technical documentation TORRIX Hart, art. no. 207095
To install the TORRIX Flex version see:
TORRIX Flex Installation Guide multilingual, art. no. 350118
The TORRIX versions can also be supplied as Ex version:
The level sensor TORRIX Ex … 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 2/36
2Safety instructions
The purpose of the TORRIX level sensor is to gauge liquid levels in tanks. 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 information 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, fitters and service technicians must observe all applicable safety regu-
lations. This also applies to any local safety and accident prevention regulations
which are not stated in these operating instructions.
The safety instructions in this manual 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 designed to ensure continued and correct operation of
the TORRIX level sensor or helpful advice to make your work easier.

Page 3/36 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 sensor head (1) of the level sensor, concealed by cap (2), are the protected terminal
clamps and configuration buttons. The electrical connection is established by an
M16 x 1.5 screwed cable gland (3) or M12 plug-in connection at the top of the sensor
head and by earth connector (4) at the bottom of the sensor head (see chapters
“Installation” and “User configuration”).
Probe tube (5) features a screw-in unit (6) (cutting ring fitting or ferrule fitting) for height
adjustment capability or a flange (not shown) for fixed installation. Float (7) is the key
component for continuous gauging of the product filling level or boundary layer and is
held on the probe tube by a guard 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 4/36
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
tensioned wire (1) made of magnetostrictive material. The sensor electronics transmit
current pulses (2) through the wire, which generate a circular magnetic field (3). A
magnet (4) contained in 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 propagates directly to the sensor 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 sensor head is measured. From these
propagation times, it is possible to determine the current position of the float.
Figure 2: Operating principle of the TORRIX level sensor
2
3
5
4
1
5

Page 5/36 Installation
4Installation
When installing and maintaining the level sensor in potentially explosive
areas, the national rules must be observed (Explosion Protection Regulations,
Industrial Health and Safety Regulations, Equipment Safety Regulations and
specific conditions of the EC-type examination certificates). The generally
accepted rules of engineering and these operating instructions must be ob-
served.
All applicable local safety and accident prevention regulations not included
in these operating instructions must also be observed.
This section describes how to install the level sensor depending on the type (see the
following figure).
TORRIX screw-in unit TORRIX flange TORRIX Bypass
Figure 3: TORRIX versions
Probe length
Sensor head
Sensor head
Screew-in
unit
Probe tube
ø 12
Probe tube
ø 12
Float
Guard ring
Guard ring
Float
Flange
Neck tube
Probe length
Installation length
112
∅50
∅50
∅
50
112
116
88

Installation Page 6/36
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 the tank from underneath.
If the float is removed during installation, it must be slid back onto the
probe tube afterwards with the “TOP” marking oriented towards the sen-
sor head end, to enable correct measurements to be made.
4.1 Installation with screw-in unit
Figure 4: Installation with screw-in unit
Removal of the float is necessary only if the float does not fit through the
installation opening in the tank. Otherwise, please proceed directly to steps
3, 6 and, if applicable, 7.
Insert the level sensor into the tank (see Figure 4):
(1) Loosen both set screws, remove guard ring (1) and remove float (2) from 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 unit thread (4) with a
suitable sealing material, screw it in and tighten.
(4) Slide float (2) back onto probe tube (3).
For correct gauging, the float must be slid onto the probe tube with the
“TOP” marking oriented towards the sensor head end, to enable correct
measurements to be made.
(5) Refit guard ring (1) on the tube, align the set screws with the groove and tighten.
1
2
3
4
5

Page 7/36 Installation
(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: Compression fitting fixing
4.2 Installation with flange
The probe tube is permanently welded to the flange, which means that the installation
length cannot be altered.
Secure the flange using the flange screws.
If the float does not fit through the installation opening, 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