Operation - ABB AK101 User Manual

9 OPERATION

9.1 Normal
During normal operation the AK100 Gas Analyzer System is
used to indicate the purity of hydrogen used as a coolant. The
displays shows the percentage of hydrogen in air, which should
be safely in excess of the explosive limit at the hydrogen rich
end.
There are no routine adjustments required to the gas analyzer
system after completion of start-up procedures and putting on-
line in monitoring mode. The system requires only the carrying
out of safety routines and minor adjustments to the metering
valve to maintain the required flowrate.
A summary of the functions and status of the system for the
different range selector switch positions is shown in Table 9.1.
Note. Sections 9.1.1 and 9.1.2 only apply to the
AK101.
9.1.1 Purging of Hydrogen Coolant Gas
Initially, inert purge gas* is introduced into the system. When the
hydrogen concentration is safely below the explosive limit, air is
introduced into the system to completely displace the other two
gases.
The AK100 Gas Analyzer System provides all the necessary
indications and output signals to enable this operation to be
carried out safely.
In respect of the operation of the gas analyzer system(s), the
procedures are as follows:
Note. Suitable safety procedures apply to the
operation of gas cooling and sample systems.
1) Select position (2) of the range selector switch on the display
unit. The displays and functions are shown in Table 9.1.
2) Commence the purging operation.
3) When the changeover to introduce air into the application
plant is made, select position (3) of the range selector switch
on the display unit. The displays and functions are shown in
Table 9.1.
*Note. Purge gas options include:
CO (Carbon dioxide)
2
N (Nitrogen)
2
Ar (Argon)
R a n g e S e e l t c r o
S i w c t h P o s t i o i n
A ( K 1 0 1 o n ) y l
) 1 (
U p p r e
) 2 (
D s i p a l y
) 3 (
L o w r e ) 1 (
D s i p a l y
) 2 (
A ( K 1 0 1
o n ) y l ) 3 (
N t o a p i l p a c b e l o t h t e
Table 9.1 Functions and Status of Display Units for Different Range Selector Switch Positions
U p p r e D s i p a l y L n i e
A c u t l a D s i p a l y F u n t c o i
x x x x . V a a i r b e l V a
– – – – n I h b i t i
– – – – n I h b i t i
– – – – n I h b i t i
x x x x . V a a i r b e l a v
x x x x . V a a i r b e l a v
A K 1 0 4
9.1.2 Filling with Hydrogen Coolant Gas
This procedure is a reversal of the purging procedure.
Initially, inert purge gas* is introduced into the application plant
until the air content is safely below the explosive limit for air in
hydrogen. When this limit is reached, hydrogen is gradually
introduced into the system to displace the other two gases.
With respect to the operation of the gas analyzer system, the
procedure is as follows:
Warning. Suitable safety precautions apply to the
operation of the gas cooling and sample systems.
Note. For optimum accuracy it is recommended that
the filling operation commences within 24 hours of
carrying out the calibration procedure.
1) Select position (3) of the range selector switch on the display
unit. The displays and functions are shown in Table 9.1.
2) When the changeover to introduce hydrogen into the
application plant is made, select position (2) of the range
selector switch on the display unit. The displays and
functions are shown in Table 9.1.
3) When the display indicates that hydrogen filling is complete,
position the range selector switch at (1). The hydrogen
measurement analyzer system is now on-line in monitoring
mode – see Section 9.2.
L o w r e D s i p a l y
n A c u t l a D s i p a l y
u l e % H n i A r i H d y
2
N O T N I U S E
N O T N I U S E
N O T N I U S E
u l e % H n i * P u g r
2
u l e % A r i n i * P u g r
L n i e
l A r a m 1
S t e P i o t n
F u n t c o i n
o r g e n P r u y t i A s e r q u e r i d
n I h b i t i n I h b i t i
n I h b i t i n I h b i t i
n I h b i t i n I h b i t i
e G s a P r u y t i A s e r q u e r i d
e G s a P r u y t i A s e r q u e r i d
l A r a m 2
S t e P i o t n
A s e r q u e r i d
n I h b i t i
n I h b i t i
n I h b i t i
N t o a a v a l i b e l
N t o a a v a l i b e l
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