Honeywell STT850 Series, User Manual

Page: 95 / 118

Revision 4.0
STT850 Series HART/DE Option User’s Manual
Page 85
Table 16
– Minimum PV Tracking
LTL
(Min PV Limit) Parameter Description Lower Transducer Limit:
PV(temperature) specified lower
operating limit in user-selected units
Set-up None.
PV Lower Limit
for Stress
Condition
Method
Min PV Parameter Description Minimum PV that the device has
experienced in user selected units.
Set-up None. Value initialized to Max PV Limit
value prior to leaving the factory.
Updates to current PV automatically
when powered at user site after one
minute.
NVM Update after every 7.5 hours
Time Below
Lower Stress
Limit Parameter Description Accumulation of minutes that
Temperature measured by the device
has been below the value of “PV
Lower Stress Limit”.
Set-up None.
NVM Backup once each 8 hour period
Time Since
Last PV Down
Method Description Time that has passed since the last
time device’s PV passed below the
value of “PV Lower Stress Limit” (in
days, hours and minutes).
Set-up None
– initialized to zero prior to
leaving the factory.
NVM Backup once each 7.5 hour period