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BWT™ System Installation Guide
47
Certification & Safety Statements for the BWT Ultrasonic Flow
Transducer
When installing this apparatus in potentially hazardous areas, the following requirements must be met:
•
The installation should comply with IEC / EN 60079-14.
•
The certification covers the Panametrics BWT transducer fitted with a Panametrics JB 6819 enclosure or with an
ELFIT Sx-36 enclosure assembly. The enclosure assembly may contain a 705-1099 low power signal
pre-amplifier. Assemblies using the ELFIT enclosures are ATEX certified only; they are not IECEx certified.
•
This apparatus is equipment category 2 / EPL Gb and may be installed in zone 1 and 2 areas. It may not be used
in a zone 0 area. This apparatus is certified for gas hazards only. It has not been assessed to dust hazards.
•
The apparatus certification is valid for the ambient and process temperature range combinations listed on page
2. This is not the operational temperature range of the apparatus - check supplied documentation for
operational limits.
•
Field wiring shall be rated at least 10°C above ambient.
•
The product contains no exposed parts which produce high surface temperatures or infrared, electromagnetic
or ionizing radiation. The product must not be subjected to mechanical or thermal stresses in excess of those
permitted in the certification documentation and the instruction manual. The apparatus shall be protected from
external sources of heating or cooling by the use of a Buffer assembly, see the Specification chapter of the
transducer manual.
•
There are no internal sources of ignition in normal operation.
•
The product is an electrical apparatus and must be installed in the hazardous area in accordance with the
requirements of the product certification. The installation must be carried out in accordance with all the
appropriate international, national and local regulations, codes and practices and site requirements for
flameproof apparatus and in accordance with the instructions contained in the manual. The installation should
comply with IEC / EN 60079-14.
•
To avoid an ignition hazard, protect the transducer from impact or friction. This is of particular importance when
the material of construction is titanium.
•
The apparatus must be securely attached to the site of the flow measurement. Before installation, check that the
transducer, adapter and enclosure are firmly locked together. The transducer assembly must be attached to the
buffer assembly as detailed in the user manual. Measures must be taken to ensure a good electrical contact and
to prevent the threads from self-loosening. An inspection of the joints should be added to the routine
maintenance schedule.
•
To avoid electrical shock, the transducer must be mounted to a metal, electrically grounded, pipe system.
•
A cable lug shall be used for all connections to the apparatus' earth points.
•
Each cover is fitted with a locking device. This device must be loosened before opening the cover. It must be
tightened after the cover is replaced so as to preserve the protection provided by the enclosure. Access to the
circuitry must not be made during operation; the apparatus should be de-energized before opening.
•
Modifications to the flameproof enclosure are not permitted.
•
Cable entry devices of an appropriate, IECEx or ATEX, approved flameproof design are required. These must be
installed according to the manufacturer's instructions. Connecting cables shall be mounted securely and
protected from mechanical damage, pulling and twisting. Cable entries are ¾" NPT, 1" NPT or M20 x1.5 (see product
markings).
•
Only trained, competent personnel may install, operate and maintain the equipment.
•
The product cannot be repaired by the user; it must be replaced by an equivalent certified product. Repairs
should only be carried out by the manufacturer or by an approve repairer.
Special Conditions for Safe Use
•
Consult the manufacturer if dimensional information on the flameproof joints is necessary.
•
To avoid an ignition hazard, protect the transducer from impact or friction. This is of particular importance when
the material of construction is titanium.
EU/EEA Installation Compliance
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