: Programm screenshot (graph example 3)
In such case all base lines remain high, keeping their level which they had at the moment the
flow stops. Therefore the voltages of the horizontal continuation of the base lines can be high,
depending on the voltage level of each peak at the moment the flow stopped.
Possible reasons why the flow may stop during combustion:
– The lance valve V2 jams.
At the beginning of analysis, the oxygen is supplied to the furnace by the chamber valve
V3 during T2 and T3 for the time (seconds) set in the software (configuration window).
After expiring of T2 and T3, V3 closes the oxygen to normally continue being supplied by
the lance valve V2 until the end of analysis. But if V2 blocks there is no flow any more so
that the combustion gases remain in the IR paths constantly absorbing IR Radiation.
In this case the shape of the IR signals is repeatable as long as T2 and T3 remain
unchanged, unless V2 sometimes jams occasionally.
– Loose wire connection to the flow regulating valve V6.
In this case it is not likely to have repeatable shape of the IR signal.
– The 50-pin connector of the HF-42 is not properly connected.
Fix the connector’s screws.
– The flow control board HF-42 is faulty.
– For some reason the software goes to the gas saving mode
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