Honeywell SmartLine Multivariable SMV800 Series User Manual page 99

Group Parameter
Temperature
failsafe
Failsafe,
Reverse
Flow,
Simulation
Enable
Reverse flow
calculation
Revision 6.0
Values
On/OFF
SMV800 Series HART/DE Option User's Manual
Description
PV4 calculated: If the PV3 input
becomes good (Process input or
Sim value), device needs a power
cycle to return to normal.
PV4 Simulated: PV3 input good or
bad (Process input or Sim value),
PV4 is not dependent on PV3. If
PV4 sim input is Bad, device goes
to Burnout. If PV4 Sim input
becomes good, device returns to
normal without power cycle.
Case3: This switch OFF: If PV4 is
mapped to output, PV4 is still good
on bad PV3. PV4 calculation uses
Design Temperature or Nominal /
Default Temperature as below:
SMV3000, Standard:
Fluid = Gas: Flow equation Uses
Design Temperature.
Fluid = Liquid: Flow equation Uses
Default / Nominal Temperature.
Fluid = Steam: Flow equation Uses
Design Density.
Design Temperature = 1.
SMV3000 or SMV800 Dynamic:
Fluid = Gas, Liquid, Steam:
Flow equation uses
Nominal/Default Temperature
With Reverse flow OFF, flow value
will be zero flow when Flow is
negative (when Differential
Pressure is < 0) for Algorithm
Options = Advanced Algorithms or
1989 Algorithms
With Reverse flow ON, flow value
will be negative when Differential
Pressure is < 0 for Algorithm
Options = Advanced Algorithms
With Reverse flow ON or OFF, flow
value will be 0 when Differential
Pressure is < 0 for Algorithm
Options = ASME 1989 Algorithms
So, if Reverse flow is expected,
select Algorithm Options =
Advanced Algorithms, set Reverse
Flow Calculation parameter: ON
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