KMS-2/Exia/Exd Transmitter
Installation and Operating Manual
Page 6 of 16 KMS-2:Exia/Exd IOM
Rev H 18/05/10
ATEX
ELECTRICAL CONNECTION
Unscrew the lid to gain access to the rear terminal enclosure; the terminal block can then be removed to
facilitate connections.
Select the correct cable entry point dependent on the orientation of the sensor. The connection cable
should be bought in through an M20 gland suitable to maintain the required IP rating, and then
connected to the + and – terminals.
To prevent the risk of moisture ingress ensures that the connection cable is led downward in front of the
cable gland.
Do rotate the electronic housing relative to the orientation of the probe assembly as this would invalidate
the warranty and could cause damage to the sensor cables.
Cable Selection
The connection cable should be a twisted pair type suitable for the expected ambient conditions.
When a screened cable is used, the screen should be connected to the internal earth connection
provided. An external Earth is also provided.
Hazardous area Installation
The installation of this unit must be in compliance with the applicable national
requirements i.e. EN60079-14.
Intrinsically Safe Circuits
The connection cable shall be identified to prevent confusion with non-intrinsically safe circuits where a
colour code is used it should be light blue.
The total inductance and capacitance of the cable shall not exceed the values stated on the intrinsically
safe control device for the required gas group.
The connection cable should be bought in through the M20 cable entry via a suitable gland as necessary
to maintain the required IP rating (minimum IP54).
When refitting the lid ensure that the sealing gasket is correctly fitted into the lid recess.
Exd Area Installation
.
WARNING – Do not open when an explosive atmosphere may be present.
Exd cable entry devices shall be a certified cable gland, any unused cable entry holes to be closed using
a certified stopping device. Standard cable entries are M20 x 1.5 mm (6H, 6g) with a minimum IP rating
of 54.
Note: In an explosive environment, the cover lid must remain fitted and locked into position while
energised. Exd lid covers are required to be locked into position using the grub screws provided.
