EW0826A4_en - rev. A
Oxygen detectors
–
URS20SS
05/10/2020
Gas detection systems for industrial environments
5/8
Mechanical installation
of the optional relay
card
The control card can be expanded with a relay card inserted into a dedicated
connector
CN3
with four SPDT relays that will be activated under the following
conditions: pre-alarm, 1
st
threshold alarm 2
nd
threshold alarm and sensor fail, and
relative LED alerts.
To install the card, follow the instructions below:
Step 1:
Insert the connection slot provided
with the relay card into the control
card, making sure the flexible tab is
towards the main terminal board.
Find CN3 connector.
CN3 connector
Connection slot
(flexible tab)
Step 2:
Fit the relay card snugly
and pull the flexible tab of
the
connection
slot
towards the main terminal
board.
Flexible tab
Step 3:
Check the position of the card. Make sure
that all the card pins fit into the CN3
connector and push slightly upwards to check
that the flexible tab on the connection slot
keeps the card in place.
Step 4:
Tick the check box with a
permanent
marker
to
indicate the presence of the
relay card in the device
2,5 W
TYPE URS20SS
