The flame current generated during the flame rectification (flame proving) process is very easy to measure and determine with the on ignition control module (IGN). There are two pins located on the module with flame check printed beside it. Measuring the DC voltage at these two pins will yield a direct reference to the flame current that is present on a 1:1 ratio (1 volt DC = 1 micro amp DC). The minimum flame sense signal required is 1.0 μA DC (micro amps) +/- 5%. The nominal flame sensing current is typically between 2 and 8 mA DC.
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