BFI Automation 3001D, Original Operating Instructions

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Description
5-2
5.1.1 Measurement channel (M)
The analogue measurement channel consists of an at-
tenuation filter with signal limiter and downstream voltage-
to-current converter. The converter supplies the internal
analogue intensity display and the remote display instru-
ment with 0 to 20 mA or 4 to 20 mA through output termi-
nals.
The digital measurement channel feeds the three digit 7-
segment indicator and displays the impuls output of the
flame scanner. The momentary value will be refreshed
once per second. The value of the displayed signal is
equivalent to the flame intensity of the combustion proc-
ess within the observed flame measurement spot and is
not depending on the sensitivity setting of the flame ampli-
fier. The impuls value is affected mainly by the following
parameters:
•
Flame Scanner Output
•
Type of fuel
•
Speed of the combustion process (mixing)
•
Air to fuel ratio
•
Flue gas recirculation
•
Flame temperature