STATUS SCIENTIFIC CONTROLS
Installation, Commissioning & Routine Gas Testing
FGD10A-M Gas Detector
TD18/032
Issue:
10
Change Note:
1869
Page 18
6.3.
Indicators
Green Led for power.
Display colour changes to red for alarms and Yellow for faults.
Colour
Identity
Operation
Red
Display
Alarm
Display flashes a coloured box when an alarm level has
been reached.
Green
LED
Power
Always ON when power is connected.
Yellow
Display
Fault
Display flashes a coloured box when a fault is a detected.
7.
R
ELATIVE
R
ESPONSE
C
HARACTERISTICS
Unless otherwise specified, the FGD10A-M infrared hydrocarbon gas
detector is calibrated to provide an output signal linearised for methane (CH
4
)
during manufacture.
However, the gas detector will also respond to a range of hydrocarbon
gases. The characteristics shown in Figure 5 demonstrate the relative
response to some of the common hydrocarbons.
If the expected target gas is other than methane then either:-
a) The characteristics can be used as a guide when setting up the alarm
levels in the associated control unit, e.g. where a general hydrocarbon
response is required.
b) The FGD10A-M can be calibrated using a test gas for any of the gases
shown in Figure 5, using the span setting procedure as described in
Section 9.1.3.
