Yokogawa RAMC - Manual (Page 115)

<10. EXPLOSION-PROTECTED TYPE INSTRUMENTS>
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IM 01R01B02-00E-E 10th edition January 01, 2013 -00 All Rights Reserved. Copyright © 2003, Rota Yokogawa
10.9.2 Installation
For use in category 2G or 3G the electrical connections to the electronic transmitter and to the limit switches
must be made via suitable cable glands and / or conduit systems that satisfy the requirements of EN 60079-1
sections 13.1 and 13.2 and for which a separate test certificate is available. The cables, cable glands and
stopping plugs must be specified for an ambient temperature of 100°C. Cable glands and entry fittings (screwed
conduit entries) as well as stopping plugs of simple design may not be used. On connection of the RAMC /KF1
using a conduit entry approved for the purpose, the associated sealing facility must be arranged directly on the
housing.
For use in category 2D or 3D the electrical connections to the electronic transmitter and to the limit switches
must be made via suitable cable glands certified to the concerning dust category.
Unused openings shall be closed with certified stopping plugs in type of protection flame proof enclosure "d"
(100°C) or dust proof depending on the existing category.
Secure cable glands, stopping plugs and the safety screw for the cover against twisting.
For installation in areas with combustible dust EN 61241-17 must be considered.
The RAMC with option /KF1 shall be connected to the local equipollently grounding system. Therefore a
grounding screw is available outside on the indicator housing and inside the indicator .
The electronic transmitter and the limit switches shall be wired as described in chapter 3.2.
10.9.3 Operation
If the cover of the indicator unit has to be opened, following instructions must be followed.
1. Switch off the power supply.
2. Wait 15 minutes after power is turned off before opening the covers.
3. The cover is fixed with a special screw.
4. Be sure to lock the cover with special screw after tightening the cover.
5. Before starting the operation again, be sure to lock the cover with the locking screw.
6. Users are prohibited from making any modifications of specifications or physical configuration, such as
adding or changing the configuration of external wiring ports.
The instrument modification or parts replacement by other than authorized representatives of YOKOGAWA
is prohibited and will void the certification.
If the window of the cover is damaged the RAMC must be set out of operation..
CAUTION
WARNING
CAUTION
WARNING