DIS. 0534026 COD. 27102280
Istruzione / User’s Manual / Manuel d’utilisation
Pag.4/8
GECA Srl Via E. Fermi 98, 25064 Gussago (Brescia) Italy http://www.gecasrl.it Tel:+39 030/3730218 Fax: +39 030/3730228
Nota
: La verifica della taratura va effettuata solo da personale addestrato e autorizzato. Nel caso i valori non siano quelli
richiesti contattare il nostro laboratorio.
La verifica della Taratura può essere fatta utilizzando il nostro kit TC011 (Vedi istruzioni fornite con il Kit), collegare la
bombola al portagomma del Flussometro, far affluire il gas (a circa 0,3 l/min), attendere circa 3 minuti e verificare che la
centralina sia in allarme come decritto nel capitolo “FUNZIONAMENTO”
GB
DESCRIPTION
The
CTR137
is a central unit for wall installation, IP65, with a catalytic sensor for flammable gas. It is normally powered
at 230 AC and/or 12÷24Vdc/ac.
Two different models are available and the only difference is the calibration carried out with specific gas:
•
•
•
•
the CTR137M should be used with Methane plants.
•
•
•
•
the CTR137G should be used with LPG plants.
On the front plate the LED bar shows both the working condition and the gas concentration detected by the sensor. The
instrument is supplied with two alarm levels with sealed-type outputs relays and with tension-free change over contacts.
Furthermore it has an auxiliary outputs relays in positive security for FAULT situation and an auxiliary input (AUX) con-
nectable to our Manual NC Resetting valve with Positioning Sensor.
Fig. 1 shows a typical mains supply wiring diagram with alarm siren and normally closed solenoid valve.
OPERATIONAL DESCRIPTION
PREHEATING
: when the central unit is supplied, the “yellow” LED starts to flash and it means the sensor is heating. Af-
ter 60 seconds, the “Green” Led switches on and it means the normal working.
NORMAL OPERATING
: the central unit reads the gas concentration through the internal sensor
1st Red LED:
it switch on if the gas concentration is higher than 5% LIE.
2nd Red LED:
it switch on if the gas concentration is higher than 10% LEL; if within 4 seconds the gas is not reduced,
the “PREAL.”relay will activate. This relay is normally used as a prealarm for the controlling of a siren (
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 man-
ual 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 connected 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 concentration 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
rd
and 4th Red LED will switch off. If activated, the “FAULT” relay will be de-
activated 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” re-
lay will activate. A fault on the 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 nor-
mally activated. The "FAULT" 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 catalytic sensor is not working. If this
condition do not change, it will be necessary to replace the unit or to send it to the supplier back to repair.
Yellow, Green, 4th Red LEDs and FAULT and ALARM relays activate:
(only after press RESET key) this happens
when the catalytic 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 and the condition
is not change, it will be necessary to replace the unit and/or send it back to the supplier to repair.
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
CTR137
should be installed according to the national disposition in force on the matter.
Model
CTR137
M positioning:
Methane
(CH
4
) is a combustible gas lighter than air. Its density related to air is 0.55; its
LEL (Lower Explosion Limit) is 5% v/v (Volume).
The instrument should be fixed at 30 cm from the ceiling
and be placed
at 1-1.5 meter from the gas appliance, far from the room corners or from ventilation intakes.
