Yokogawa RAMC - Manual (Page 119)

<10. EXPLOSION-PROTECTED TYPE INSTRUMENTS>
10-27
IM 01R01B02-00E-E 10th edition January 01, 2013 -00 All Rights Reserved. Copyright © 2003, Rota Yokogawa
10.13 Flame proof and dust proof NEPSI (China) certi-
fied RAMC (/NF1)
10.13.1 Technical data
Certificate :
GYJ071430
Flame proof :
Ex d IIC T6
Dust proof :
DIP A20 TA T1 - T6 IP67
Max. surface temperature
TA: corresponding process temperature
Housing :
Painted aluminium casting type 91
Output signal (with electronic transmitter -E or -H) :
4–20 mA (2- wire unit, 3- wire unit) ; 0-20 mA (3- wire unit)
Power supply (with electronic transmitter -E or -H) :
2- or 3- wire unit
Limit switches :
Options /K1 to /K10 possible
Ambient temperature :
-20 °C to 60 °C
-20 °C to 55 °C (for use in zone 20)
Minimum process temperature :
-20°C
Threads for cable glands :
- M16x1.5 (standard)
- ½” NPT (option /A5)
Temperature classification for gas application :
see chapter 10.9
10.13.2 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 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 /NF1 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.
CAUTION
The RAMC with option /NF1 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.