Revision 1.0
SMV800 Modbus User's Guide
Page 51
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Reverse Flow
ON
OFF
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
Example:
When Reverse flow is ON, PV4 is
calculated considering the absolute
value of DP (when Differential Pressure
is < 0) and resulting Flwo 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
Содержание SMV800
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