ezPyro
TM
Flame Detection Evaluation Kit User Manual
Page 14 of 18
© Copyright Pyreos Ltd. 2020
ezPyro
TM
User Manual Rev. 3.1
The above example shows that all signal multipliers are set to unity leaving them unchanged. The threshold ratios are
set to a value of 2. This means that the threshold value is double that of the algorithm signals for the rejection
channels.
Reducing the threshold values to be less than 1 will result in the black bar being under the red lines that represent
the signal level of that channel as shown in
Figure 19: Reduced threshold ratios
As can be seen the required threshold for a flame event has been lowered to less than the signal level for both
channels. Human motion threshold is half the actual signal and Reject is 75% of the actual signal value. This is an
unlikely situation for setting the ratios when the signal multipliers are set to 1 as there is constantly a false alarm
occurring.
You could leave the threshold as above and increase the signal level using the signal multipliers.
Figure 20: Reduced threshold ratios and increased rejection channel multipliers
Although the threshold is still below the actual signal multiplier the signal level has been increased. This should be
done to compensate for differences in system performance.
These features allow calibration of a system.
