Honeywell STT850 Series - SV Tracking; Table 17 - Maximum SV Tracking; Table 18 - Minimum SV Tracking

Page 86 STT850 Series HART/DE Option User’s Manual Revision 4.0
8.2.3 SV Tracking
Table 17 – Maximum SV Tracking
Max SV Limit
Parameter
Description
CJ Temperature (SV) upper operating limit from
specification.
Set-up
None.
Max SV
Value
Parameter
Description
Highest Temperature ever experienced by the device.
Set-up
None - value initialized to Min SV Limit value prior to
leaving the factory. Updates to current CJ Temperature
automatically when powered at user site after one minute.
NVM
Update after every 8 hours.
Time Above
Upper Stress
Limit
Parameter
Description
Accumulation of minutes that device’s CJ Temperature has
been above the value of “SV Upper Stress Limit”.
Set-up
None.
NVM
Backup once each 8 hour period
Time Since
Last SV Up
Method
Description
Time that has passed since the last time device’s CJ
Temperature has passed above the value of “SV Upper
Stress Limit” (in days, hours and minutes).
Set-up
None.
NVM
Backup once each 8 hour period
Table 18 – Minimum SV Tracking
Min SV Limit
Parameter
Description
CJ Temperature (SV) lower operating limit from
specification.
Set-up
None.
Min SV
Value
Parameter
Description
Lowest CJ Temperature ever experienced by the device.
Set-up
None - value initialized to Max SV Limit value prior to
leaving the factory. Updates to current CJ Temperature
automatically when powered at user site after one minute.
NVM
Update after every 8 hours.
Time Below
Lower Stress
Limit
Parameter
Description
Accumulation of minutes that device has been below the
value of “SV Lower Stress Limit”.
Set-up
None.
NVM
Backup once each 8 hour period
Time Since
Last SV
Down
Method
Description
Time that has passed since the last time device’s CJ
Temperature has passed below the value of “SV Lower
Stress Limit” (in days, hours, and minutes).
Set-up
None.
NVM
Backup once each 8 hour period