2002 by ELTRA GmbH Germany – January 2002 – Service Manual OH 900 / ON 900 / ONH 2000
3.7-1
3.7
3.7
Checking for leaks
Turn the main switch to position 0 or 1
Disconnect the tube of the furnace outlet.
Connect a vacuum meter to the free end of the tube.
Disconnect the tube of the pump inlet.
Suck 300 mbar on this tube and seal it.
The pressure gauge should be stable for at least 30 sec.
If the system is leaking, repeat above test by squeezing each single tube along the gas
system, until the leakage area is located. ( see drawing below )
1,5bar
22p si
H O
2
C O
2
C O
2
C O
2
H O
2
H O
2
3 0 l/h
Electr ode
impulse
fu rnace
30l/h
50l/h
Du st
Purge
Measure
Pu rge
va lve
c on tr o l l ed
1. 5
b ar
22
Pressure
switch
1,5 bar
ps i
0. 5
0 2. 5
2
1
gas stop
Carrier
30-6 0psi
2 -4b ar
yell ow
Purg e
50 l /h
Carrier Gas Helium
regulator
P ressure
Flow sensor
ON 900
TC C EL L
15l/h
con t r ol l e d
O U T
I N
G as p ump
g re y
yell ow
gree n b lue
C O f ur n a ceC O >
2
Infrared Cell
0,35bar /5.3p si
b lac k
re d
34015
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