Revision 4.0
STT850 Series HART/DE Option User’s Manual
Page 89
8.2.6 % Service Life
% Service Life
Parameter
Description
Percent of expected Service Life that device
has been in service. Value is based on
electronics temperature. Service life
accumulates faster at higher temperatures
with an exponential relationship.
Set-up
None.
NVM
Backup once each 7.5 hour period
8.2.7 Operating Voltage Diagnostics
Table 21
– Operating Voltage Diagnostics
Current Op
Voltage
Parameter
Description
Operating voltage available at device
terminals.
Set-up
None
– units always in volts.
NVM
none
Note
No accuracy is specified for this
measurement!
This value is intended to be used for
informational purposes only and should
not be used for control.
Min Op Voltage
Parameter
Description
Minimum operating voltage experienced by
device at terminals since last reset of
operating voltage parameters.
Set-up
User can reset as desired using method
described in item below.
NVM
Backup once each 7.5 hour period
Time Since Last
Voltage Low
Method
Description
Displays time since last minimum operating
voltage event in minutes.
Set-up
User can reset as desired using method
described in item below.
NVM
Update every 7.5 hour.
Reset Operating
Voltage
Parameters
Method
Description
Causes “Min Op Voltage” to be set to 32
volts and “Time Since Last Event” to be
reset to zero. Within a short period of time
“Min Op Voltage” will assume operating
voltage value.
Set-up
User actuates as desired.
