Sontay GL-CO-RFG-651, Быстрый старт

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GL - CO - RFG - 65x
1, 2 or 3 - Channel Gas Leak Alarm Systems
Issue Number 7.1
27/08/2021 Four Elms Road - Edenbridge
Kent - TN8 6AB - UK
Page 2 of 5
Siting of Devices
Detectors
These must be sited in a dry space which meets the relevant ambient requirements.
If installed in a location classified as “ Hazardous ” it must be installed in a cabinet for electrical equipment constructed according to the regula-
tions in force for the class of danger concerned.
The controller can be mounted on a DIN rail and housed in a standard DIN enclosure.
Sensors
The correct siting of the sensor is fundamental for the correct functioning of the system. The position depends on the type of gas to be moni-
tored and, in particular, on its density in respect of air:
•
Methane (gas lighter than air which therefore tends to rise).
Position: at a distance of 10 to 50cm from the ceiling and, in any event, above doors or windows.
•
Propane (LPG) (gas heavier than air and so tends to move downwards).Position: at a distance of 10 to 50cm from the floor.
•
Carbon monoxide (CO) (gas with a density very similar to that of air and which therefore tends to diffuse uniformly)
Position: at a height of 150 to 200cm from floor.
Moreover, to ensure the correct operation of the detector and to avoid useless alarms due to a casual and momentary presence of gas, the
sensor must NOT be positioned:
— Less than 1 to 2 metres from boilers or water heaters,
— Less than 2 to 3 metres from kitchen ranges and ovens,
— In spaces where air movement could be hindered (e.g. in corners or enclosed spaces),
— Near to doors or windows,
— Near to air extractors,
— In places where dust or dirt could contaminate the sensor and so render it ineffective,
— In places subject to possible sprays of water, particularly sensors positioned near the floor,
— In places where the temperature or humidity could be outside the limits stated.
Solenoid shut - off valve
— This must be installed on the gas distribution pipe, taking the following precautions:
— If possible, in a different space from the one being controlled,
— In an easily - accessible place, especially for the valves which have to be reset manually.
— If installed outside, it must be protected against the weather,
— In installations with external propane (LPG) gas tank, it must be installed downstream of the pressure - reducing valve (30 to 40 mbar).
Alarm Levels
Methane
— Alarm methane 0.5… 0.8 …1.25 %
5,000… 8,000 …12,500 ppm
— Pre - alarm methane 0.3... 0.5 ...0.8 %
3,000... 5,000 ...8,000 ppm
Propane - GPL
— Alarm propane - LPG 0.22… 0.35 …0.56 %
2,200… 3,500 …5,600 ppm
— Pre - alarm propane - LPG 0.14... 0.22 ...0.35 %
1,400... 2,200 ...3,500 ppm
Carbon monoxide (CO)
Warning: in detecting carbon monoxide (CO), the levels and in-
tervention times are processed and controlled by a microproces-
sor. The
“ Sensitivity ” control must be set in the “0” position.
— Carbon monoxide - CO alarm: "thr time"
< 50 ppm: no alarm
50...100 ppm: 60 minutes
100...300 ppm: 10 minutes
>300 ppm: immediate alarm
— Carbon monoxide - CO pre - alarm:
Time between exceeding alarm threshold and alarm