Sitron SLU, Installation Manual, Page: 21 / 24

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Safe, Protection, Compatibility and Explosion Proof
The level meter SLU is equipped with protection against reverse polarity and output current overload Protection against dangerous
contact is secured by low safety voltage compiles with EN 33 2000-4-41.
Electromagnetic compatibility according to EN 55022/B, EN 61326/Z1 and EN 61000-4-2 to 6.
Explosion proof of SLU-X type compiles with the following standards: EN 60079-0 : 2007;
EN 60079-11 : 2007 ; EN 60079-26 : 2007
Special Conditions for Safe use SLU-X
The device is designed for connection to the isolating repeater SIR-420. When the other opproved supply units is used, whose output
parameters satisfy above mentioned output parameters, its is necessary to have a galvanic separation or, if supply unit without
galvanic separation is used (Zener barriers), it is necessary provide potenital equalization between sensor and point of barrier
earthing.
For application in zone 0 the present explosive atmosphere- misture of air with flammable gases, vapour or mists must comply: 0,8 bar
< p < 1,1 bar. The device must be installed in such a way, to prevent mechanical damage of sensor face.
The level meter does not require any personnel for its operation. It is used to inform the technological entity operating personnel on the
measured substance level height during the operation. Maintenance of this equipment consists in verification of the integrity of the level
meter and of the supply cable. Depending on the character of the substance measured, we recommend to verify at least once per year
the clarity of the ultrasound transducer emitting field and to clean it, respectively. In case any visible defects are discovered, the
manufacturer or reseller of this equipment must be contacted immediately.
It is forbidden to perform any modifications or interventions into the SLU level meter without manufacturer's approval.
Potential repairs must be carried out by the manufacturer or by a manufacturer authorized service organization only.
Installation, commissioning, operation and maintenance of the SLU level meter has to be carried out in accordance with this
instruction manual; The provisions of regulations in force regarding the installation of electrical equipment have to be
adhered to. In accordance with EN 60079-14 (Electrical apparatus for explosive gas atmospheres - Part 14: Electrical
installations in hazardous areas other than mines) and in accordance with other standards that apply to given area.
Use, Manipulation and Maintenance
Installation Manual