APPLICATION NOTE
FLAME
CURRENT MEASUREMENT
Local Flame Sensina (Sinale S~ark and Sense)
With power off, connect a DC microammeter (D'Arsonval movement type) as shown in the diagram below.
(The meter should be protected from high voltage surges which could damage the meter movement. A
1.5pF
200
volt film capacitor across the meter terminals or lead wires will provide adequate protection.) The lead
wires and terminals must be isolated from other surfaces to prevent
the,H.V. signal from arcing to ground
during the trial-for-ignition period.
Apply power. Once the flame is established and the sparks shut off, a flame sense current of 1.5pA
DC
minimum is required for proper operation.
CAUTION:
Due to possible conditions, do not touch the microammeter or lead wires during the flame sense
test. Always remove power before any adjustments.
Local Flame Sensing (Single Spark and Sense)
Remote Flame Sensinq
With power off, remove the sense wire from the electrode terminal and install a
DC
microammeter in series
with the electrode terminal and sense wire, as shown in the diagram below.
Apply power. Once flame is established, a flame sense current of
1
.5pA DC minimum is required for proper
operation.
When Remote Flame Sensing is used, it is not necessary to employ the 1.5pF protection capacitor across the
meter. However, since it does not affect the performance of the microammeter, it may remain in place at all
times.
Remote Flame Sensing
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