STATUS SCIENTIFIC CONTROLS
Installation, Commissioning & Routine Gas Testing
FGD10A-M Gas Detector
TD18/032
Issue:
10
Change Note:
1869
Page 20
8.
I
NITIAL
G
AS
T
ESTING
FGD10A-M units are factory calibrated as detailed on the calibration
certificate supplied with the instrument. However, it is always advisable after
installation to confirm that the instrument reads zero with no gas present and
responds accurately when presented with an appropriate concentration of
the target gas.
The FGD10A-M display becomes operational within 60 seconds however,
the sensor should be allowed to stabilise for the period specified on the
associated calibration certificate before attempting to check the zero setting
and gas response, usually 30 minutes.
8.1.
Zero gas
With no gas present check that the instrument reads zero on the display *.
a) If the instrument reads zero then no adjustment is required and gas
response testing may now be carried out as described in Section 8.2.
b) If the instrument does not read zero then adjustment of the zero setting
is required as described in Section 9.1.2. - Sensor Zero.
c) If the analogue signal is connected to an associated control panel,
confirm that when the FGD10A-M display reads zero, the control panel
display also reads zero or, adjust as necessary in accordance with the
con
trol panel manufacturers’ instructions.
* Note
– If there is the possibility of a background gas being present then zeroing of
the detector should be carried out using a test gas cylinder of air in nitrogen.
