Environmental Monitoring System (EMS-01) Instruction Manual
12
3.2
Sensors and Relays
Regardless of sensor type or combinations of sensor types, there must always be an
end of line
(EOL) terminating resistor
at the end of the sensing circuit to allow for
cable break monitoring
and
alarm reference set point
. The unit relies upon a terminating resistor of value
47k ohms.
The unit should be
powered OFF
when making connections. Sensors should be installed so that
they remain
accessible for maintenance
.
Multiple sensors and sensor types may be connected to the unit.
Sensor cables
(SCY), for example, monitor
for water along their full length and can be run in lengths between 1 and 100 metres; Sensor probes (ESD)
monitor for water in their exact location only and can be connected in circuits of between 1 and 20 probes.
3.2.1
Sensor / Relay Connections
Figure 6:
EMS-01 Rear Panel Showing Sensor / Relay Connections
A.
Connect Sensor Cable (SCY) using LC10C and End of Line
Figure 7:
Sensor Cable Connection using Leader Cable (LC10C)
Connect the Sensor Cable using LC10C and End of Line (EOL) as follows:
1.
Ensure that the unit is powered OFF.
Connect the
leader cable
into the
sensor
input terminal
on the unit. Do not connect
the green or white cores
(
Figure 6
).
2.
Plug the opposite end of the
leader cable
into the
sensor cable
(
Figure 7
).
3.
Once all sensor cables are connected (to a
maximum total length of
100 metres
), plug
the
End of Line (EOL) terminator
into the
end of the last run of the
sensor cable
.
SENSOR INPUT
Red Core: Left
Black Core: Right
FAULT RELAY
COM|NO|NC
ALARM RELAY 1
NC|COM|NO
POWER FAULT RELAY
NC|NO|COM
ALARM RELAY 2
NO|COM|NC
Cable Connection
Leader Cable
Sensor Cable
EOL Terminator
