EW146691_en - rev. A
Gas Detectors
–
UR.21.P
02/04/2020
Gas detection systems for car parks and tunnels
5/8
Electrical Installation
Terminal Block and
electric connections
Cabling:
Configuration:
4…20mA Output
Reference Selection:
4…20mA Output Signal
Type Configuration:
Alarm Thresholds
Settings:
CAUTION:
Make sure that the area is safe and that the device has been
disconnected from the power supply before starting any wiring and configuration
operation.
Sensor installation must be carried out in accordance with local Standards.
For cable entry, use the 16mm pipe fitting provided in the case, or replace it with a cable gland
(17mm diameter box hole) and make sure that the cable sheath is suitable for the cable gland.
The sensor must be earthed using the appropriate system provided.
Depending on the connection distance, use a cable with at least 3 conductors with a minimum
section of 0.75mm
2
up to 100m, 1mm
2
up to 200m, 1.5mm
2
up to 500m.
In the presence of electromagnetic disturbances use shielded cable.
If the relay board is present, use a multipolar cable suitable for the number of connections.
The cable sheath must not exceed the diameter required by the cable gland.
Sensor is supplied with a basic programming which is the one indicated as default in the
chapter of the technical features.
To change these settings, disconnect the device, make all the necessary settings using the
triple jumpers
J4
or the Dip Switch SW1 shown in the figure and supply the device again; in
particular:
Sensor is basic set to have the negative of the supply signal as the 4÷20mA signal reference;
to change this setting it is necessary to move the triple jumpers
J4
as shown in the figure:
Ref. to
-
(default) Ref. to
+
To set the 4…20mA output signal type, operator has to use the 5th selector of the dip-switch
in
SW1
position, particularly:
Proportional Output (4÷20mA) Step Output (0-10-20mA)
To set the intervention thresholds of the optional relay board or of the 4
20mA output
threshold operation, it is necessary to act on the first four dip-switch selectors of the
SW1
position; in particular thresholds expressed as a percentage of the Full Scale are the followig:
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
CUSTOM (*) 3, 5, 10% 5, 10, 15% 5, 10, 20% 10, 15, 25% 10, 15, 30%
10, 20, 40% 10, 25, 35% 15, 25, 40% 15, 30, 45% 25, 35, 50% 20, 40, 60%
(DEFAULT)
-----------------------------Future Implementation----------------------------
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
(*) When the first four dip-switch
selectors are in the OFF position,
the trip thresholds can be only set
by
TUS40..
maintenance
and
service terminal.
In the event that this selection is
made without the presence of the
maintenance and service terminal,
the device will take the default
thresholds
as
intervention
thresholds.
For the use of the terminal see the
relative operating manual.
2
1
6
5
2
1
6
5
12 / 24Vdc
+
-
4 ÷ 20mA
-
+
Terminal Block
TB1
Triple Jumpers J4
Dip Switch SW1
Sensor Card
Relay or PM Card
(on CN1 connector)
Card Guide for:
Relay or
PhotoMOS Cards
CN4 Connector for
Sensor Card
CN3 connector for:
TUS40.. o Display Board
Shield
S
S