73
3.29.4 101BFlow stops during analysis
Fig. 26: 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 flat 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
Pos: 6 /0 010 ELTR A/------- Seit enu mbruc h ----------- @ 6\mod_1368796429449_0.docx @ 41468 @ 11 @ 1
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