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PO LY C O E F F I C I E N T S
N E X T L A S T
CHNG
O P T N O P T N
W A R N I N G - Control l o o p
s h o u l d be i n m a n u a l
P R O
C E E D
W A R N I N G : a l l
c o e f f i c i e n t s a r e
s e n t a f t e r c o e f
i s e n t e r e d
P O L Y C O E F F. A 0
±
±
[
0 . 0 0 0 0 0 0 E
0 0 ]
< - - - - - ->
C L R
P r e s s
F 4 f o r s e n d
o r
E S C t o a b o r t
P o l y
C o e f f i c i e n t s
N o t S e n t
CONF - Change I/O - POLY COEFFICIENTS option
(600T and 600T EN Pressure Transmitter)
The Polynomial function, applied to the input (x) of the trasmitter expressed
in % of the span, is in the following form:
Out = ± A0 ± A1 (x) ± A2 (x
where Out is in the range 4 to 20 mA, A0 is in % of the output span and
represents the output bias, A1 to A5 are in real value. All the values are
expressed in scientific notation, i.e. in the form: ± X.XXXXXX E±XX .
From the Configuration main menu press F1 (CHGN-I/O) and then F1
(NEXT OPT) until the top display is shown.
Pressing F3 (CHGN) the warning message will be displayed: after having
p o l y
accepted this message with PROCEED a further warning message will be
issued signalling that the polynomial coefficient will be sent to the
A 5
transmitter only after the last coefficient, A5, is entered.
After some seconds the following display appears allowing the entry of the
1st coefficient, i.e. A0. Using the F1 and F2 to move the cursor and the
numeric keypad, the correct value (and sign) of the coefficient should be
entered. The coefficients are usually small values: to maintain the
necessary accuracy make use of the scientific notation, i.e. to enter the
E N T R
value 0.000345678 enter 3.456780 E -04. When the value is entered
press F4: the display shows the next coefficient to be set. If a term is null
press simply F4 to skip to the next.
When the last coefficient has been entered, pressing F4 the following
display will appear: pressing F4 all the coefficients will be sent to the
transmitter and the Poly Coefficients display will be re-issued, while
S E N D
pressing ESCape the procedure will be aborted and the following message
D A T A
displayed.
The same message is displayed if, during the Polynomial Coefficients
procedure, the ESCape key is used to abort the procedure or when the
procedure is automatically aborted because the entered coefficients are
not compatible, e.g. all coefficients are 0. This display lasts for some
seconds and then the Poly Coefficients display is newly displayed.
To leave the procedure press ESCape: a warning message will be
displayed to warn to change the loop in Auto, if necessary.
) ± A3 (x
) ± A4 (x
) ± A5 (x
2
3
4
5
)
- 25 -
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