6. If the difference between the readings is greater
than 0.1 bar, we recommend replacing the
pressure gauge (7) (see section 9.5.1, on page
30).
9.3.2 Inspecting the valves
No tools are necessary if the pressure gauge has
been inspected as described in section 9.3.1, page
27. Proceed as follows:
1. Close the vent valve (2). Close the
filling/withdrawal valve (1). Close the pressure-
building valve (3).
2. Connect a pressure source (oil-free dry air) (6) that
can be varied between 0 and 0.5 bar to the fill
connector (4).
3. Open the fill valve (1) and note the pressure
readings when the valves (5a and 5b) are opened.
If the pressure is not between 0.45 and 0.5 bar,
replace the valve.
4. Lower the pressure in the tank slowly. To do so,
close the fill valve (1) and gradually open the vent
valve (2).
Make sure that nobody is in the path of the
jet of air issuing from the vent valve (2).
5. Note the pressure readings when the valves (5a
and 5b) are opened. Change the valve if the
pressure is not below 0.45 bars.
9.3.3 Checking the level indicator
No tools are necessary if the pressure gauge has
been inspected as described in section 9.3.1, page
27. Proceed as follows:
The control head must be in a vertical position
during all these movements
.
1. With the head still mounted on the empty tank,
check that the red mark (1) is on the bottom line of
the level indicator.
If the mark is not at zero, you must adjust the zero
(see § 9.4.1, on page 29).
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