Service
111
• Release the push button (43).
• Close the furnace, squeeze the tube (6) tightly and
press and hold the button (43).
If the pressure on gauge (12) remains constant, then the furnace has to be
checked for leaks.
If the pressure shown on gauge (12) drops then the leakage has to be found
somewhere along the furnace inlet system.
5.7.1
118BFurnace inlet system - leaks
• After following the above instructions, check for gas leakage between inlet
tube (6) and reverse valve (V2).
5.7.1.1 Leaks in the furnace
After following the above instructions, close the furnace, squeeze tube (9) tightly,
press and hold the button (43), observe the pressure gauge (12).
If the pressure drops, then the furnace is leaking.
• Check whether the O-rings (16), (17) and (18) are soiled or defective see
Operation Manual.
• Check whether the combustion tube (15) is broken or cracked.
– If the pressure remains constant, then the furnace outlet system is leaking.
5.7.1.2 Leaks in the furnace outlet system
• After following the instructions in the section "Leaks in the furnace", check if
the handle (8) is properly shut, or else there will be a major gas leak from the
dust filter.
• Check the following components for leakage, by squeezing the following
tubes, while pressing and holding the button (43):
Tube to squeeze Leak location
19 dust trap (10)
glass tube (11)
dust filter cartridge (13)
outflow valve (V1)
5.7.1.3 Leaks inside the analyzer
When pressing the button (43), the gauge (12) shows a pressure drop while the
furnace is open then locate the leakage, according to the sequence below.
• Keep the furnace opened.
• Squeeze the following tubes tightly, while pressing and
holding the button (43):
Tube to squeeze Leak location
4 Exhaust valve (V9)
37 Flow meter (40)
34 CO2-Paths (38)
31 SO3-Trap (35) or oxidizing furnace tube (36)
24 SO2-Path (32) or flow sensor (33)
23 Regulator valve (V6)
22 Pressure regulator (PR3)
44 Bypass valve (V4), check for 24 VDC on input pins
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