Effective: March 2020
4
F-35-703
Flame Current Measurement
Flame current is the current that passes through the flame from
sensor to ground. A good burner ground that matches the
control ground is critical for reliable flame sensing.
LOCAL FLAME SENSE
With power off, connect a DC microamp meter as shown in the
figure below. During the TFI, the meter should be protected
from high voltage surge which could damage the meter. A
jumper wire must be installed across the terminals of the meter.
Once the flame is established, and sparking terminates, remove
the jumper wire to measure flame current. The flame sense
current must be 0.7 uA minimum for proper operation.
REMOTE FLAME SENSE
With power off, remove sense wire from S1 terminal, and install
a DC microamp meter between the S1 terminal and sense wire.
Establish flame, then measure flame current. The flame sense
current must be 0.7 uA minimum for proper operation.
DIMENSIONS
Figure 4. Enclosure
Figure 5. Potted
Figure 6. Integral Standoff
35-703
Note:
All dimensions are in inches
