EW146691_en - rev. A
Gas Detectors
–
UR.21.P
02/04/2020
Gas detection systems for car parks and tunnels
7/8
Electrical installation of
the optional relay card
Type of contact
selection:
Setting of relay control
logic:
After the relay card is mechanically installed it is necessary to provide for its electrical
configuration by selecting the relay control logic and the type of contact that is required on
the terminal board (NC or NO).
For each relay there is a pair of removable terminals to which the type of contact (NC or NO)
can be associated, selectable by jumpers
JP1
…
JP4
of the relay card.
Contact NC or NO of pre-alarm relay
Contact NC or NO of 1
st
Threshold relay
Contact NC or NO of 2
nd
Threshold relay
Contact NC or NO of Fail realy
DL1 (yellow), Sensor FAULT
DL2 (red), 1
st
Alarm Threshold
DL3 (red), 2
nd
Alarm Threshold
DL4 (red), Pre-alarm
Type of contact selection:
NC NO
To perform the setting of the control logic of the direct relays (relay energized in the presence
of an event) or reverse (relay energized in the absence of an event), it is necessary to act on
the 6
th
dip-switch of the
SW1
selector; in particular:
direct logic reverse logic
Preliminary checks after
mechanical and electrical
installation
Sensor is calibrated at the factory and therefore no calibration operations are planned once
installed; however, after installation it is necessary to perform a functional check of the
sensors. When the device is powered, it will set itself in the sensor preheating phase, which
lasts about 2 minutes.
After this time the sensor will go into the normal operating state, however the best
performance will be obtained after about 2 hours.
With the operating sensor it is necessary to verify its response using the specific
TUL40.
. test
kit consisting of:
−
1 calibrated gas bottle to 50% of the LEL of the Methane or to 500ppm of CO (see
ordering codes of the test kit on the specific technical sheet);
−
special pressure reducer and flow regulator
TUL40.FLUX
or equivalent, so as to
guarantee a flow of about 0,5 liters / minute;
−
universal adapter to adapt to the sensor body (
URCAP.L
);
−
connection pipe between the cylinder and adapter, approximately 2m long.
During the test it is necessary to observe the value of the output current, the status of the
LED visible outside the sensor body and, if present, the status of the LEDs on the relay
board, before closing the case.
The LED on the sensor body and the 4
20mA output have the following functional meaning:
Sensor State
4÷20mA Output
State Led on Sensor Body
PREHEATING
2mA
Flashing with 2 Hz frequency
WORKING
4
20mA
0,10,20mA for
threshold
applications
1 pulse
“ON” every about 10s
PRE-ALARM
2 pulses
“ON” every about 5s
1
st
ALARM THRESHOLD
3 pulses
“ON” every about 5s
2
nd
ALARM THRESHOLD
4 pulses
“ON” every about 5s
FAILED SENSOR
22mA
ON steady
OVER-RANGE FAILURE
22mA
1 pulse
“OFF” every about 5s
After applying the gas mixture at 50% of the LEL of the Methane gas (or at 500ppm for the
CO) using the test kit (test gas application time > 2 minutes), make sure that the 4÷20mA
output is between the 11 and 13 mA for Methane (or between 19 and 21mA for CO), the
status LED flashes with 4 pulses every 5 seconds and the prealarm, 1st and 2nd alarm
thresholds relays of the relay board are energized (or de-energized if SW1.6 is set to ON).
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
D | C
B | A