172-65710M-04 (SC-F71 Parameters/Functions) 23 Dec 2021
131
5.6 Extracting Square Root of Input
Square root extraction can control flow by sending the output signal directly from a
differential pressure type flow transmitter to instrument. By setting PV low input cut-
off, Square root extraction will not be performed for the Measured value below the
set value of PV low input cut-off.
Description of function
●
Square root extraction
When using a differential pressure type flow transmitter, the Measured value (PV)
is computed by Square root extraction.
* Output from
differential pressure
type flow transmitter
PV low input cut-
off
√
(Square root
extraction)
PV to be used for
flow control and
displayed
●
PV low input cut-off
The result of square root extraction become “0” when the Measured value (PV) drops
below the set value of the PV low input cut-off. Output is not produced when the
result of square root extraction is zero (0).
When input signal square root extraction is used for in flow control, etc., the Square
root extraction result varies widely at the Low measured value range. The Measured
value less than the PV low input cut-off is ignored to compute control output in order to
prevent control disturbance caused by input variation at Low measured value range.
Parameter setting
●
Input 1_Square root extraction [Engineering mode: Function block No. 21 (
Fn21
)]
Parameter symbol
Data range
Factory set value
1. SQ R
0: Unused
1: Used
0
To display
“Input 1_Square root extraction”, choose “Current” or “Voltage” in
Function block No. 21: Input 1_Input type
(Engineering mode), AND choose “0
to 2” in Function block No. 51: Input 1_Control action (Engineering mode).
Equation: Measured value (PV) = (Input value*) × PV ratio + PV bias
Содержание SC-F71
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