STATUS SCIENTIFIC CONTROLS
Installation, Commissioning & Routine Gas Testing
FGD10B Pellistor Gas Detector
TD18/008
Issue:
10
Change Note:
1904
Page 16
Test gas
Figure 7 shows a typical arrangement for the application of a certified test
gas.
The purpose of the test gas response check is to confirm that that the
reading on the instrument corresponds with the test gas concentration.
a) If the associated control panel reads correctly then no adjustment is
required.
b) If the above checks are satisfactory then the installation is now
complete.
c) If the instrument does not read correctly then adjustment of the sensor
span setting is required as described in Section 5.1.2. - Sensor Span.
4.2.1.
Gas connection points
Certified test gas can be applied either:-
a). directly to the FGD10B via the appropriate sampling/calibration adaptor.
or
b). remotely, by connecting a test gas sampling tube to the appropriate
sampling/calibration adaptor and installing a test point at the remote end of
the tube.
Method b) avoids the need to gain direct access to the unit in order to carry
out routine gas testing. The sample tube should be taken to a convenient
point and sited such that the risk of contamination is minimised. A means
must be provided to ‘cap off’ the tube when not in use in order to prevent
blockage.
The weather guard is provided with a 6mm O.D. push in tube connector to
allow connection of a gas sampling tube. Firstly, remove the blanking plug by
depressing the coloured plastic ring whilst pulling on the plug; now push in
the gas sampling tube. The standard fitting is a push fit connector for 6mm
O.D tubing. The connector is screwed into a 1/8” BSP thread; other fittings
are available on request.
Where a weather guard is not fitted, the use of a sampling adaptor (Stock
No. SS336) is required in order to present the gas to the FGD10B sensor.
