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HMI: Measurements/Alarms
Data stacks
Gas data values are stored in "stacks" with the number of data values stored by the system
corresponding to 2.5x times the short-term or long-term time horizon set by the user. This is
to enable the calculation of an accurate long-term extrapolation:
• Short term stack: XXX short horizon minutes x 2.5 /10 values
• Long term stack: XXX long horizon days x 2.5 values
The status of the stack fill is displayed in the HMI. See Figure 61 – Gas sensor information.
When there are not enough data points received to date to calculate the short or long-term
trend, then the corresponding "stack not enough" alarm flag is. See Figure 62 – Gas sensor
alarms.
The values requiring data from an uncomplete stack are not displayed in the HMI and are
replaced by a "-" instead, until the stack is fully filled.
HMI: Measurements/Gas
MA-037 - CB Watch 3 Operating Manual
Figure 62 – Gas sensor alarms
Figure 63 – Not enough gas values to display data
v7.0 - May 2020
Page 46 of 118
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