Page 1
Limit Switch
Series
instrumentación
para fluidos
LT / LTL ADF
Instructions Manual
R-MI-LTADF Rev.:0 English Version
Page 2
TÉCNICAL DATA
• Material: Metal alloy aluminium without copper
• Ambient temperature range: -20 a 40 ºC
• Ingress protection: IP67
• Category of application : Ex II 2 GD EExd IIC T6
LIMIT SWITCH CHARACTERISTICS AND CONNECTION
AMM: Vmax: 250 V
Imax: 3 A
1. Earth
2. Common
3. Normally closed
4. Normally open
AMD: Vnom: 8.2 VDC
Max. level I > 2.2 mA
Min. level I < 1.1 mA
1. Earth
2. Positive
!
3. Negative
4. Not connected
AMR: Vmax: 250 V
Imax: 0.5 A
1. Earth
2. Common
3. Normally closed
4. Normally open
1
2
3
4
!
Important:
If the operation of the limit switches is checked before installation, this must be done in a non
hazardous area.
To check the limit switch, it must be removed from the level.
Unscrew the electrical housing cover to gain access to the electrical connections.
Situate the limit switch in its normal working position and move a magnet as if it was the float.
The orientation of the magnet varies with the level type. For the LT series (with float in exterior
glass tube) the magnet should be vertical with the north pole must be pointing upwards. For the
LTL (with magnetic strips) series the magnet should be horizontal with the north pole points
towards the level switch.
The signal at the electrical connection terminals will vary according to the float’s position (with the
AMM and AMR this can be checked using a multimeter).
2
Page 3
CHARACTERISTICS WITH REGARDS TO SAFETY
Equipment conforms to the following directives and norms.
73/23/EEC Low voltage.
89/336/EEC Electromagnetic compatibility
94/9/EC (ATEX) Equipment & protective systems intended for use in potentially explosive
EN 50014 Electrical apparatus for potentially explosive atmospheres. General
EN 50018 Electrical apparatus for potentially explosive atmospheres. Flameproof
EN 50281-1-1 Electrical apparatus for use in the presence of combustible dust. Part 1-1
This instrument, since it belongs to Group II, is destinated to be used in areas where there is a
hazard of explosive atmospheres forming, except for mining installations.
Since it is category 2GD it can be used in ambients where there is a probability of formation of
explosive atmospheres due to gases, vapours, mists or powder in suspension.
!
IMPORTANT
• The respective national regulations, as well as the general engineering rules that apply to the
installation and operation of apparatus in explosive atmospheres must be observed .
• The end user is responsible for the safe use of this equipment.
• Modification or reparation of the flameproof housing is not permitted.
• The opening of the housing always shall be done without voltage. The housing is considered
to be closed when the lid is c ompletely screwed down and the grub screw in its locking
position.
• Only approved EExd IIC cable glands with the same thread as the housing should be used.
• The flameproof seals of the housing should kept greased to avoid corrosion, water ingress
and seizing. Clean rests of grease and corrosion, do not use sharp objects that can damage
the surface of the seal, and grease using a che mically and thermally stable grease with a
drip point > 200ºC.
• In applications with combustible dust, make sure that layers of more than 5 mm do not form.
• For the models that have non-metallic parts, the occurrence of electrostatic risks, must be
taken into account. They should not be used in locations where formation of electrostatic
charge can occur. During maintenance, these parts should always be cleaned using a damp
cloth.
atmospheres
requirements.
enclosures “d”.
electrical apparatus protected by enclosures.
NOTE: The LT/LTL series level, to which this limit switch belongs, can be installed in a tan k in
which the inside is consider ed to be zone 0, because the part that is inside the tank is a si mple
Non electrical equipment without ignition sources.
3
Page 4
MARKING
The marking of the equipment shows the
following characteristics:
LT 1 … ADF
II 2 GD
0163
LOM 05ATEXxxxx
Narcís Monturiol 33
St. Just Desvern
08960
S.A.
N. EXAANNN
EEx d IIC T6
IP67 T 85º
Barcelona (Spain)
- Manufacturer
- Model
- EC marking
- Serial Number (year of
construction and number)
- Notified body
- Flameproof marking
- Address of manufacturer
WARRANTY
Tecfluid S.A. GUARANTEES ALL ITS PRODUCTS FOR A PERIOD OF 24 MONTHS, after
consignment, against all defects in materials and workmanship.
This warranty does not cover failures which can be imputed to misuse, use in an application different
to that specified in the order, the resu lt of service or modification by un-authorized perso ns, bad
handling or accident.
This warranty is limited to cover the repair or replacement defective parts which have not been
damaged by misuse.
This warranty is limited to the repair of the equipment and all further and eventually following
damages are not covered by this warranty.
Any consignment of equipment to our factory or distributor must be previously authorised. The
consignment should be done with the equipment well packed, clean of any liquids, grease or
hazardous materials. Tecfluid S.A. will not accept any responsibility for damage done during
transport.
Together with the equip ment, a note should be enclos ed indicating the failure observed, the name,
address and telephone number of the sender.
TECFLUID, S.A.
Narcís Monturiol, 33
E-08960 Sant Just Desvern
Tel. + 34 933 724 511 - Fax + 34 934 734 449
E-mail: tecfluid@tecfluid.com
Internet: www.tecfluid.com
The technical data in this pamphlet is subject to modification without notification, if the technical innovations in the product or
manufacturing processes so require.
Loading...