Table 40 - Minimum Pv Tracking - Honeywell ST 700 User Manual

LTL Parameter
(Min PV Limit)
PV Lower Limit Method
for Stress
Condition
Min PV Parameter
Time Below Parameter
Lower Stress
Limit
Time Since Method
Last PV Down
Page 154
Table 40 – Minimum PV Tracking
Description
Set-up
Description
Example for DP Type
Example for AP and
GP Types
Set-up
Description
Set-up
NVM
Description
Set-up
NVM
Description
Set-up
NVM
ST 700 Series HART/DE Option User's Manual
Lower Transducer Limit: PV(pressure)
specified lower operating limit in user-
selected units
None.
Actual limit value used in "Time Below
Limit" and "Time Since Last Event".
Value is equal to "Min PV Limit" plus
10% of limits range for DP type
devices and zero for GP and AP type
devices.
For STD120 span is 0 to 400 inH
Range is 400 inH O settable within
2
LTL = -800 inH O to UTL = 800
2
inH O limits.
2
"PV Lower Stress Limit" =
-800 inH O + 160 inH
2
inH O.
2
For STA140 allowable working
pressure is 0 to 500 psia.
Withstand Pressure from LTL = 0 to
UTL = 750 psia.
"PV Lower Stress Limit" = 0 psia.
None: calculation is automatic.
Minimum PV that the device has
experienced in user selected units.
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.
Update after every 8 hours
Accumulation of minutes that pressure
measured by the device has been
below the value of "PV Lower Stress
Limit".
None.
Backup once each 8 hour period
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).
None: initialized to zero prior to
leaving the factory.
Backup once each 8 hour period
O.
2
O = -640
2
Revision 4.0