Honeywell SmartLine ST700, Руководство пользователя

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Page 76
ST 700 Series HART/DE Option User’s Manual
Revision 4.0
9.2.2 PV Tracking Diagnostics
Table 16
– Maximum PV Tracking
UTL (Max PV
Limit) Parameter Description Upper Transducer Limit: PV(pressure)
specified upper operating limit in user-
selected units
Set-up None.
PV Upper
Limit for
Stress
tracking Method Description for
DP type
Actual limit value used to note “Time Above
Limit” and “Time Since Last Event”. “PV
Upper Stress Limit” value is equal to Upper
Transducer Limit less 10% of Transducer
limits range.
Example for DP
Type For STD120 span is 0 to 400 inH
2
O.
Range is 400 inH
2
O settable within
LTL = -800 inH
2
O to UTL = 800 inH
2
O limits.
“PV Upper Stress Limit” =
800 inH
2
O - 160 inH
2
O = 640 inH
2
O.
Example for AP
and GP Types For STA140 allowable working pressure is 0
to 500 psia.
Withstand Pressure from LTL = 0 to UTL =
750 psia.
“PV Upper Stress Limit” = 750 psia – 75
psia = 675 psia.
Set-up None: calculation is automatic.
Max PV Parameter Description Maximum PV that the device has
experienced in user selected units.
Set-up None. Value initialized to Min 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 8 hours.
Time Above
Upper Stress
Limit Parameter Description Accumulation of minutes that pressure
measured by the device has been above
“PV Upper Stress Limit”.
Set-up None: initialized to zero prior to leaving the
factory.
NVM Backup once each 8 hour period
Time Since
Last PV Up Method Description Time that has passed since the last time
device’s PV passed above “PV Upper
Stress Limit” (in days, hours and minutes).
Set-up None: initialized to zero prior to leaving the
factory.
NVM Backup once each 8 hour period