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6 SETTING UP
6.1 Katharometer Analyser Panel – Filling the Drying
Chamber – Fig. 6.1
1) Remove the drying chamber on the katharometer analyser
panel by unscrewing the large knurled nut at the base of the
chamber. Pull the chamber down and out of the sealing
groove to remove it from the panel.
2) Open a container of fresh granular anhydrous calcium
sulphate or calcium chloride, immediately fill, and prepare to
replace, the drying chamber.
Note. The capacity of the drying chamber is about 140
ml. To fill the chamber, approximately 100 g of desiccant is
required.
3) Replace the drying chamber in its sealing groove and
reposition the chamber to enable it to be secured and sealed
by hand tightening the knurled nut.
4) Carry out an approved leak testing procedure before passing
sample gas through the system.
Metering
valve
Gas
sample
inlet
20
6.2 Setting Sample Flow
When all tubing interconnections have been made and external
parts of the sample system checked for leaks, the suggested
procedure is as follows:
1) Arrange to supply calibration quality carbon dioxide gas
through the gas analyser system at the normal working
pressure of the application plant and within the limits given in
Section 13.
not be considered an adequate check of gas tight integrity
in respect of the more penetrating hydrogen gas.
Consideration may be given to the use of a gas, such as
helium, which has penetrating properties nearer to that of
hydrogen.
2) Slowly open the metering valve to give a nominal flowrate of
gas of 100 to 150 ml min
flowrate given in Section 13.
3) Set the flowrate and shut off the calibration gas external to
the analyser system.
4) Repeat this procedure for each katharometer analyser panel,
as required.
Katharometer
Local zero
unit case
adjustment
Drying chamber
Fig. 6.1 Katharometer Analyser Panel
Caution. Testing for leaks with carbon dioxide may
–1
. Do not exceed the maximum
Gas sample
outlet
interconnections
Flow gauge
Electrical
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