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5 .10 IS applications
For IS applications, the data highway connection must be via a galvanic isolator and
so an MTL5553 isolator is connected in-line in the safe area (see ATEX and IECEx
Information section.).
The - and + terminals of the data highway should be connected to the corresponding
–ve and +ve terminals of the MTL5553 (13 & 14 respectively) located in the safe area.
See the section on ATEX and IECEx information for detailed instructions.
A built-in terminator is activated by installing a jumper between terminals 7 and 8
of the MTL5553. Do not install a jumper across terminals 7 and 8. The MTL5553
terminator is not used in the MTL830C system installation. Activating the
terminator may cause MTL830C system data highway communications to fail.
5 .11 Multi-transmitter connections
Connect the data highway to a receiver for MTL831C/MTL831C-PS Transmitter
#1 as in diagram below. Connect the MTL831C/MTL831C-PS Transmitter #1 data
highway (+, S, and – terminal) to the equivalent terminals on a MTL831C/MTL831C-
PS Transmitter #2. Install a jumper wire between the Address terminals (A and S) on
MTL831C/MTL831C-PS Transmitter #2.
The MTL831C/MTL831C-PS is supplied with a double sided data highway
connector to facilitate linking two MTL831C/MTL831C-PS Transmitters.
Up to two MTL831C/MTL831C-PS Analog Transmitters may be connected on a single
data highway to the MTL838C/MTL5553.
To Receiver
DATA Highway
5 .12 Cable screens
Each cable screen should be earthed in only one location.
5 .12 .1 Sensor screens
Generally, screens of sensor cables are tied to earth using an earth bar tied to local
instrument earth in the MTL831C/MTL831C-PS enclosure. If a sensor cable screen is
earthed at the sensor, then it should not be earthed or connected to other screens at
the MTL831C/MTL831C-PS.
NOTE
NOTE
Transmitter #2
Transmitter #1
INM MTL831C Rev 7
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