<10. EXPLOSION-PROTECTED TYPE INSTRUMENTS>
10-25
IM 01R01B02-00E-E 12th edition October 01, 2014 -00
All Rights Reserved. Copyright © 2003, Rota Yokogawa
10.11.2 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 IEC 60079-1 and for
which a separate test certicate is available. The cables, cable glands and stopping plugs must be specied for
an ambient temperature of 100°C. Cable glands and entry ttings (screwed conduit entries) as well as stopping
plugs of simple design may not be used. On connection of the RAMC /EF1 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 certied to the concerning dust category.
Unused openings shall be closed with certied stopping plugs in type of protection ame 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.
The RAMC with option /EF1 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.
10.11.3 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 xed 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 modications of specications or physical conguration, such as
adding or changing the conguration of external wiring ports.
The instrument modication or parts replacement by other than authorized representatives of YOKOGAWA
is prohibited and will void the certication.
If the window of the cover is damaged the RAMC must be set out of operation..
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