TO Flame Sensing Evaluation Kit (Analog) USEQFCK4000000
The above information is believed to be correct but does not purport to be all inclusive and must be used only as a guide.
© KEMET
Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
11
5
EXAMPLE DEMONSTRATION
Follow these steps to demonstrate flame detection using a lighter from around 0.5 meter
distance.
1. Install the software
– see Section 3.1.
2. Connect the Demo Kit
– see Section
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.
3. Go to Demo Kit settings
– see Section 4.3 and select gain of 16 on Channels 0, 1 and
2. Close the settings page.
4. On the main page, enable the flame detection algorithm.
5. Set the following thresholds multipliers: Ch0 = 0, Ch1 = 3, Ch2 = 0. This should result
in
Overall Thresholds
of 0, 6 and 0 respectively.
6. Test by waving a hand in front of the sensors. Expected outcome:
a. Signal viewer for Ch2
– “human” filter:
i. in
Raw Signal
mode shows a wave as hand passes the sensor.
ii. in
Fourier Transform
mode low frequency component increases.
iii. in
10 Hz Signal
mode there is an increase in level.
b.
10 Hz Response
bars for Channels 0 and 1 do not show much increase, but
Channel 2 increases depending on the intensity of hand movement.
c. Detection result
– “Flame Not Detected” showing in bottom left corner of the
application.
2
7. Test by lighting a lighter in front of the sensors. Expected outcome:
a. Signal viewer for Ch1
– “flame” filter:
i. generally a higher response is shown on Ch1 for flame test at the moment of
starting the flame than on Ch2 for hand waving test.
ii. in
Raw Signal
mode shows a spike when lighter is lit, then shows ripple when
the flame is on, and bigger oscillation if the lighter is shaken.
iii. in
Fourier Transform
mode low frequency component increases.
iv. in
10 Hz Signal
mode there is a sharp increase in level when the lighter is lit,
followed by a drop when the flame is on.
b.
10 Hz Response
bars for Channel 0 does not show much increase, Channel 1
shows significant response, while Channel 2 response depends on hand and other
movement in the Field of View of the sensors.
c. Detection result
– flame icon showing in bottom left corner of the application.
3
5.1
Key Adjustments
•
If the algorithm is constantly triggering and the flame icon is showing in the bottom left
corner of the application, increase the overall threshold. The
Overall Thresholds
of
each channel can be set just above noise level as the starting point for adjustment.
•
If the algorithm is not triggering when a flame is present, decrease the
Overall
Threshold
and/or the
Threshold Multiplier
for the flame channel. The magnitude of
10 Hz response when the flame event occurs can be used to set the detection
threshold on the flame channel to around half of this value as the starting point for
adjustment.
2
In case of detection result not being as expected, see Section 5.1.
3
In case of detection result not being as expected, see Section 5.1.
