Hydrogen - ABB AK101 User Manual

...8 START-UP
2) Power up the monitor unit, and the purge gas katharometer
unit by switching on the appropriate power supply unit.
3) Set the range selector switch on the gas monitor unit to
position (3).
4) The upper display unit indicates NOT IN USE.
5) The lower display unit indicates the selected measurement
parameter – percentage by volume of air in purge gas*
(%AIR IN * ) – on its lower display line. The upper display line
indicates a value for the parameter.
6) With suitable calibration gas passing through the sample
system at the normal flowrate, the upper line of the lower
display unit should stabilize within 2 hours to read 0.0.
7) If necessary, refer to Section 10.3.3 for a full calibration
sequence.
Note. A remote zero adjustment facility is available at
the lower 'zero' potentiometer adjacent to the display
unit. Adjustment is made by inserting a screwdriver
through the hole behind the small escutcheon plate.
8) Reset the range selector switch on the gas monitor to
position 2. The upper display continues to indicate NOT IN
USE.
9) The lower display unit indicates the selected measurement
parameter – percentage by volume of hydrogen in purge
gas* (%H2 IN * ) – on the lower line. The upper line indicates
a value for the parameter.
10) With purge gas* continuing to pass through the sample
system, the upper line of the lower display unit should
stabilize within a few minutes to read 0.0.
11) If necessary, refer to Section 10.2.3 for a full calibration
sequence.
Note. No adjustment of the lower zero potentiometer is
necessary as any adjustment required will already have
been made while calibrating the 'Air in purge gas*'
range.
*Note. Purge gas options include:
CO (Carbon dioxide)
2
N (Nitrogen)
2
Ar (Argon)
28

8.4.3 Hydrogen

Note. Test for leaks in accordance with the
requirements of the responsible authority after making
any hydrogen connections.
1) Pass calibration quality hydrogen gas through the (H2)
Katharometer Unit on the appropriate katharometer analyzer
panel, at the normal working pressure of the sample gas
system. This provides the correct flowrate of gas, as set
previously.
2) Power up the monitor unit and the hydrogen katharometer
unit by switching on the appropriate power supply unit.
3) If fitted, set the range selector switch on the monitor unit to
position (1).
4) The upper (hydrogen) display indicates the measurement
parameter – percentage by volume of hydrogen in air (%H2
IN AIR) – on the lower line. The upper display line indicates a
value for the parameter.
5) If fitted, the lower (purge gas) display unit indicates NOT IN
USE.
6) With hydrogen calibration gas passing through the sample
system at the normal flowrate, the upper display line of the
top display unit should stabilize within 2 hours to read 100.0.
7) If necessary, refer to Section 10.1.3 for a full calibration
sequence.
Note. Remote zero adjustment is available – see Fig.
2.1. Adjustment is made by inserting a screwdriver
through the hole behind the small cover plate.