Honeywell SmartLine Multivariable SMV800 Series User Manual page 100

Group Parameter
Enable
Reverse flow
calculation
Failsafe,
Reverse Flow,
Simulation
Simulate DP
DP Value
Simulate SP
SP value
Simulate PT
PT value
Simulate
Flow
Flow value
Page 88
Values
ON
OFF
ON
OFF
ON
OFF
ON
OFF
SMV800 Series HART/DE Option User's Manual
Description
Example:
Check this setting if reverse flow is
expected so that flow is non zero
when DP <0. When this flag is
checked, absolute value of DP is
used for flow calculations when DP <
0. For some Flow Elements and
Algorithm Standards, Reverse Flow
may not be applicable. In this case,
flow value will be zero regardless of
Enable Reverse Flow Calculation
checked or unchecked.
When Reverse flow is ON, PV4 is
calculated considering the absolute
value of DP (when Differential
Pressure is < 0) and resulting Flow
value will be negative.
Example When Reverse Flow OFF:
DP = -100 inH20
SP = 14.45 psi.
PV4 (Flow) = 0
Example When Reverse Flow ON:
DP = -100 inH20 (-3.612 psi)
SP = 14.45 psi.
PV4 calculation will consider 100in
H20 in calculation.
SP value, SP=SP-DP.
SP = 14.45-(-3.612)=18.062 psi will
be used in the flow algorithm
calculation for Advanced Algorithms
resulting in negative flow value.
Note that, for some Primary
Elements and Algorithm Standards,
Reverse Flow may not be applicable.
In this case, flow value will be zero
regardless of the Reverse Flow
Calculation option.
When ON User can enter DP
simulation value in inH2O39degF
When ON User can enter SP
simulation value in psi
When ON User can enter PT
simulation value in degC
When ON User can enter Flow
simulation value in:
Lb/s for Mass flow and ft3/sec for
volume flow
Revision 6.0