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IST-2128.KX02.01
2nd Red LED: it switch on if the gas concentration is higher than 10% LEL; if within 4 seconds the gas is not re-
duced, the "PREAL."relay will activate. This relay is normally used as a prealarm for the controlling of a siren
(model SE301A).
3rd Red LED: it switch on if the gas concentration is higher than 20% LIE; if the gas persists, the 4th Red LED
"STOP" switches on within 30 seconds and the "ALARM" relay will activate. It is normally used to stop the gas
through the manual reset solenoid valve (NO or NC) and/or the interruption of the electrical energy.
If it has been installed a manual reset solenoid valve N.C. with magnetic sensor (mod. VR420÷VR480) con-
nected to "AUX" input, in the case that the gas is still open, the yellow LED and the "FAULT " Relay will activate
(see "FAULTS" section).
RESET KEY: The alarm condition remains latched, LEDs and relays remain activated, even if the gas concentra-
tion is reduced, because the mounted valve is closed. To reset the normal working conditions and/or switch off the
siren push the "RESET" button.
Buzzer the "PREAL." relay will be deactivated and the Red Led flashes, only if the gas concentration is higher
than 10% of LIE. After 20 seconds, both of them will return in preallarm. (the siren rings)
If it has been used a manual reset solenoid valve NC with the magnetic sensor and in the case that it is
snapped, the Yellow led will switch off and the "FAULT" relay will be deactivated. (See FAULTS section).
Alarm Reset The central unit will begin to the normal working, only if the gas concentration is lower than 10%
LIE, the "ALARM" relay will be deactivated and the 3
relay will be deactivated and the "Yellow" LED will switch off. (see FAULTS sections).
Warning: Pushing the RESET button, if the gas concentration is higher than F.S., it can happen that the first
"PREAL." relay will be deactivated and the first three Red LEDs will switch off. The Yellow LED will illuminate and
the "FAULT" relay will activate. A fault on the Remote Sensor is most probable in this case. Eliminate the
alarm's cause, if the condition persist pushing the RESET button, please consult the FAULTS section.
FAULTS: The central unit signal different kind of failures activating the Yellow LED and the FAULT relay. That is
normally activated. This relay, if necessary, can be used both to signal remotely an occurred damage and to signal
the absence of power to the instrument.
Yellow and Green LEDs and FAULT relay activate: this happens when the remote sensor is not working. If this
condition do not change, it will be necessary to replace the remote sensor or to send it to the supplier back to re-
pair.
Yellow, Green, 4th Red LEDs and FAULT and ALARM relays activate: (only after press RESET key) this hap-
pens when the remote sensor is not working or in few cases when there is a higher gas concentration. In this case
the central unit will remain in alarm, as described in the OPERATING>WARNING Section. If there are not any gas
leaks, please verify the cable connection between remote sensor and central unit. If the condition does not change,
replace the remote sensor and/or send it back for reparation to the supplier.
Manual reset solenoid valve NC with magnetic sensor failure: this situation appears ONLY when is installed
an electro valve with magnetic sensor; if it not close the gas, the ALARM relay will activate (gas concentration
higher than 20% LIE) and the magnetic sensor signals to the central unit the this bad working. In this case all led
will be lighted and relays will be activated. The failure condition (yellow led lighted and FAULT relay activated) will
be cancelled if pressing the RESET key, the solution of the problem will be visualized.
INSTALLATION
The SE128K should be installed according to the national disposition in force on the matter.
Model SE128K positioning: the central unit should be wall-mounted in an accessible position and easily visible, in
a zone of the room where the protection required is inferior to IP54. The central unit should be installed long
distance, but not to the open air.
The remote Sensor: it has to be installed as described in the specific instructions attached with it.
After the installation and referred to the gas indicated on the testing label of the remote sensor, apply on the
SE128K, the self-sticking label with the name of the calibration gas inserted in the housing.
Mounting: The Fig. 2 shows the instrument size. It should be wall-mounted by three screw anchors. The normally
closed manually resetting valve for the gas cut-off should be installed outside the room in a clearly indicated po-
sition and should be protected from rain.
Electrical Connection: the instrument is supply with non reversible and plug-in terminals. Therefore the cables
should be anchored to the case in order to avoid terminal overstress. The connection to the central unit does not need
any hearting. The remote sensor can be placed at a max. distance of 100 meters from the central unit with a cable of
2
3x1.5mm
or to a distance of 200 meters using a 3x2.5 mm
Fig. 3 shows the AC powering connection with alarm siren and normally closed manual resetting valve.
Fig. 4 shows the AC powering connection with alarm siren and normally open manual resetting valve.
Fig. 5 shows the AC powering connection with alarm siren and our normally closed manual resetting valve with
positioning sensor (models VR420÷VR480,) to verify, if an alarm occurs, the really gas cut-off.
Fig. 5 shows the 12Vdc powering connection with both 12Vdc alarm siren and normally closed manual resetting
valve with, for example, our power supply unit PS175 with internal 12Vcc-7Ah battery to maintain the system pow-
ered on in absence of Main power supply.
WARNING
The detector doesn't need adjustments after being installed.
TECNOCONTROL S.r.l. Via Miglioli 47 SEGRATE ( MI )
Istruzione / User's Manual / Manuel d'utilisation
rd
and 4th Red LED will switch off. If activated, the "FAULT"
2
cable. It is not necessary to use shielded cables.
Tel: 02/26 92 28 90 Fax: 02/21 33 734
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