Appendix A Algorithms
284
Note that the general intentions for the choices of “NO”, “YES”, “AUTO” and
“WARN” (where applicable) are as follows:
“NO”: Ignore fault.
“YES”: Always take monitor Out of Service.
“AUTO”: Take monitor Out of Service, but attempt to return to Service if
fault condition clears.
“WARN”: Monitor remains in Service; banner displayed across top of
screen describing fault as defined in the F10 – Banner Instructions screen.
Measurement Variance Ratio Setting and Strategy
(Background Change Tracking)
This feature tracks background changes during measurement. This is done by
breaking collection up into a series of shorter collections and using a routine derived
from background running totals to determine average, variance and variance ratio for
the occupant/object measurement.
• Refer to F3 – Setup, F1 – Common Values (on page 103), Measurement
Variance Ratio Limit Exceeded.
• Refer to F3 – Setup, F2 – Wait Timeouts (on page 106), Measurement
Collect Time.
• Refer to F3 – Setup, F3 – Detection Zones, F1 – Zone Configuration (on
page 113), Measurement Variance Ratio Limit.
• Refer to F3 - Setup, F3 - Detection Zones, F9 - Edit Calibration Source List
(on page 137), Measurement Variance Ratio Limit Exceeded.
• Refer to F3 – Setup, F11 – Instructions, F3 – Go Back Instructions (on page
186), Background Change.
• Refer to F3 - Setup, F11 – Instructions, F11 – Alarm Test Instructions (on
page 193), Background Change.
Also refer to the background equations in Background Rate Calculations on page 275
and Background Variance Ratio on page 277 substituting R
M
(Measurement Rate)
for R
B
(Background Rate). Note that R
M
is accumulated for Measurement Time
(instead of Background Average Period) so there is no need for oldest points to be
subtracted out.
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