2002 by ELTRA GmbH Germany – January 2002 – Service Manual OH 900 / ON 900 / ONH 2000
2.7-1
2.7
2.7
Flow rates:
Analyse- and purge flow must be adjusted manually, because the furnace is an open
system.
The total flow into the system is shown in the left flow meter on the front panel.
The standard flow gets into the furnace through the gas inlet between upper electrode and
sample drop. The analytical flow is sucked by a pump on the outlet of the furnace. The
remaining carrier gas purges the sample in the sample drop.
The purge flow is activated with opening the furnace during the outgas phase. This flow
gets into the furnace through the furnace outlet, so that only pure carrier gas flows in the
analyser.
Adjust the gas flow as follows:
The main switch ( G ) is on pos.2
The furnace is closed ( piston up ).
If not, close the furnace and wait
for 10 seconds.
Adjust the lower regulator ( D )
until the left flow meter ( A )
shows 30 l/h
Open the furnace
Adjust the upper regulator ( C )
until the left flow meter ( A )
shows 50 l/h
Close the furnace
If the above settings are unstable,
increase both flows
by about 10 l/h.
Adjustment of the flow meter ( B ),
see 2.1
D
C
A B
130
100
50
10
10
5
15
bar
1,5
1
0,5
2,5
2
bar
1,5
1
0,5
2,5
2
0
0
2
1
E
F
G
0
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