Honeywell ST 700 - Using DTMs; Introduction; Components; Downloads

Revision 4.0 ST 700 Series HART/DE Option User’s Manual Page 79
9.2.4 TV Tracking Diagnostics
Table 20 – TV Tracking Diagnostics
Max TV Limit
Parameter
Description
Static Pressure upper operating limit
specification.
Units are always PSI (pounds per square
inch).
Set-up
None.
Max TV Value
Parameter
Description
Highest SP ever experienced by the device.
Units are always PSI (pounds per square
inch).
Set-up
None.
NVM
Backup once each 8 hour period
Time Above
Upper Stress
Limit
Parameter
Description
Accumulation of minutes that device’s SP
has been above the value of “SP Upper
Stress Limit”.
Set-up
None.
NVM
Backup once each 8 hour period
Time Since
Last TV Up
Method
Description
Time that has passed since the last time
device’s SP has passed above the value of
“SP Upper Stress Limit” (in days, hours, and
minutes).
Set-up
None.
NVM
Backup once each 8 hour period
9.2.5 ET Tracking Diagnostics
Table 21 – Maximum ET Diagnostics
Max ET Limit
Parameter
Description
Electronics Temperature (ET) upper
operating limit from specification.
Units are same degree units as has been
selected for SV (Secondary Variable).
Set-up
None.
ET Upper
Limit for
Stress
Condition
Description
Actual limit used in “Time Above Limit” and
“Time Since Last Event”. Value is equal to
“Max ET Limit” less 10% of limits range.
Example
Electronics Temperature range is -40F to
185F for a total of 225F.
ET Upper Stress Limit= 185F - 10% of
225F = 162.5F.
Set-up
None: calculation is automatic.
Max ET Value
Parameter
Description
Highest Electronics Temperature ever
experienced by the device.
Units are same degree units as has been
selected for SV (Secondary Variable).
Set-up
None.
NVM
Update every 8 hour.
Time Above
Upper Stress
Limit
Parameter
Description
Accumulation of minutes that device’s
Electronics Temperature has been above
the value of “ET Upper Stress Limit”.
Set-up
None.
NVM
Backup once each 8 hour period