Blocked fittings:
This case is very unlikely to happen in case of induction furnace operation, because the
analyzed materials in question are inorganic materials like metals and ceramics, so that they
don’t create fumes, volatiles and moisture. Even cement analysis is not as critical as organics
analysis. In case of analysis of materials causing major contamination, mainly when analyzing
organic materials in the resistance furnace, the fittings of the IR cells can be blocked so that
they have to be cleaned. See chapter “IR paths cleaning and replacing”.
Also fittings elsewhere can be blocked, like the fittings for plastic tubes on the reagent glass-
tube holders.
Blocked flow sensor assembly:
If the flow sensor is blocked, it should normally be replaced.
For those who may decide to clean them - please read the description about cleaning. Chapter
“Flow sensor replacing / cleaning”.
Electronic reasons for flow problems:
The flow controller consists of 3 components.
Induction furnace operation
1. The flow sensor
2. The board HF-42 (The lower half of the board only).
3. The proportional valve V6 (see chapter “Gas flow system”).
4. Interferences from the induction generator. See chapter “Analysis takes too long / RF-
interference on the IR-cell, or on the electronic units”.
The electronic devices involved in the flow regulation are the board HF-42 and the flow sensor.
The only influence of the PC and of the microcontroller on the flow, is the start/stop the flow, for
example to start it when oxygen pressure available, to stop it in case of gas saving mode etc.
For chasing flow problems, there is a possibility to avoid any involvement of the PC and of the
microcontroller, by setting a jumper on the HF-42. To do this, move the jumper of J3 from A1-A2
to B3-B4. See chapter “Gas flow controller and jumper settings”.
Mortal danger from electric shock
Exposed power contacts - High Voltage
- An electric shock can cause injuries in the form of burns and
cardiac arrhythmia, respiratory arrest or cardiac arrest.
• Disconnect the mains power plug before opening the
analyzer’s cabinet.
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