Ref: ds_GLD_0209 Ver1.0.
Gas Leak Detection GLD
Page 3 of 4
E.C. Products Limited - Head Office
EC House, Amberley Way, Hounslow
Middlesex, TW4 6BH, United Kingdom
Tel:
+44 (0)20 8569 4100
Fax:
+44 (0)20 8569 4111
ECP reserves the right to change the information contained in this datasheet as and when required without notice. Users must take care to use the information contained in this leaflet. ECP will not
accept the liability for damages, loss and expenses that may be caused by omissions and errors in the information provided.
Facias
GLD361
GLD65x
1– Sensitivity potentiometer
2– Power supply LED
3– Fault LED
4– Alarm LED
5– Reset button
OPERATION
The detector, when it is powered (2), remains inactive for 1.5 ... 2
minutes with the FAULT (3) and ALARM (4) LEDs blinking, to give
time to the sensor to become stabilised.
The sensor sends to the detector a signal with a voltage
proportional to the concentration of gas present in the air.
When the concentration exceeds the pre-alarm threshold the
ALARM (4) LED blinks.
When the signal exceeds the alarm threshold the detector, after
a delay of about 20 seconds :
– activates the internal buzzer
– switches on the ALARM (4) LED
– activates the operational control
Pre-alarm and alarm threshold
The alarm threshold for natural gas is about 16% of the LEL
(lower limit of explosivity of the gas in air). This is below the limit
set by the manufacturing standards (20% of LEL). The pre-alarm
threshold is about two thirds of the alarm threshold.
This permits, in the event of an alarm, taking action under
conditions of maximum safety.
Using the SENSITIVITY (1) potentiometer the thresholds can
be adjusted within the limits established by the manufacturing
standards :
Potentiometer t = increase in sensitivity
Potentiometer towards – = decrease in sensitivity
Alarm
The alarm status brings about the action of the operational relay :
if normally de-energised (F2 - F3 with link) : relay becomes
●
energised,contacts : 1-3 closes, 2-3 opens.
if normally energised (F2 - F3 without link) : relay becomes de-
●
energised,contacts : 1-3 opens, 2-3 closes.
It is signalled by :
activation of internal buzzer (only if terminals M - F1 without
●
link)
lighting of ALARM (6.4) LED on facia.
●
Latching alarm and reset
The detector can be programmed in two ways :
Without latching alarm (F3 - F4 with link) :
1.
alarm ceases when concentration of gas returns below
●
threshold level
a slow blinking (0.2 seconds On and one second Off) of the
●
ALARM (4) LED indicates the alarm status.
To disactivate it use the RESET (5) button (press for 5
●
seconds).
With latching alarm (F3 - F4 without link - factory setting) :
2.
alarm continues even when concentration of gas returns below
●
threshold level
To disactivate it use the RESET (5) button (press for 5 seconds).
●
Self-diagnosis
In the event of a fault or of incorrect connection of the sensor the
FAULT (3) or ALARM (4) LED lights.
Type of fault
Fault
LED (3)
Alarm
LED(4)
Breakage of sensor self-heating element
x
No connection to terminal G
x
No connection to terminal B
x
No connection to terminal M
x
Connections G and B inverted
x
Connections G and M inverted
x
When the ALARM LED lights up the detector puts the system in
alarm mode.