Explosion protection
5.1 ATEX
SITRANS SL
Operating Instructions, 12/2010, A5E01132948-04
73
5.1.4 Electric connections in the ATEX system
The electric connections are done in two junction boxes between the receiver and the
transmitter and in one junction box connecting the customer cable. The connections inside
the unit housings are done in the factory before delivery and work here can only be done by
certified technicians.
The tables below illustrate the connections in the main junction box providing all in- and
output connectors to the SITRANS SL. The terminals as well as their assignment are
described in chapter Screw terminals (Page 48) .
Sensor connection cable
The sensor connection cable connects the junction boxes at the receiver and transmitter of
the SITRANS SL. This cable is used to transfer:
● 100 kbps RS-485 communication
● power for the transmitter
● ground.
Table 5- 1 Electric connection sensor connection cable, valid for ATEX product versions
Conductor color
Connector position
(Receiver junction box)
Connector position
(Transmitter junction box)
Remarks
Function
Red 1 1 +
Blue 2 2 -
24 V DC power supply to
transmitter unit
Pink 3 3 Com+
Grey 4 4 Com-
White 5 5 Sync+
Brown 6 6 Sync-
RS 485 communication
Green PE terminal PE terminal
Yellow PE terminal PE terminal
Shield Gland Gland
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