364Ax-Gx Instruction Manual
29
Two Polynomial functions of 2
nd
order
The Analog Output transfer function can also be
defined as a two
polynomial function. Both
polynomials are of 2
nd
order. So two different
polynomial functions are used:
Output = A
0
+ A
1
x + A
2
x
2
if x
≤
k
Output = B
0
+ B
1
x + B
2
x
2
if x > k
Ax and Bx terms of the polynomials have to b e
calculated according to the shape of the vessel.
A PC based software tool is availabl e for polynomial
coefficients definition.
Set the Transfer function on the transmitter
Set the Transfer function on the transmitter by Digital LCD Integral Display
Navigate the Digital LCD Integral Display menu, select
Device Config
>
Transfer Function
>
Type
, and the
Transfer Function in use will be available. To modify select
Edit
then scroll th e desired Transfer Function
(see the following table) with the up and down keys and confirm with
OK
.
Linear
Output = x
3/2
Output = x
3/2
5/2
Output = x
5/2
Polynomial
Output = A
0
+ A
1
x + A
2
x
2
+ A
3
x
3
+ A
4
x
4
+ A
5
x
5
Double Poly
Output = B
0
+ B
1
x + B
2
x
2
if x
≤
k
Output = C
0
+ C
1
x + C
2
x
2
if x > k
)
Digital LCD Integral Display Keys sequence to set the Transfer Function: 2 – 6 – 1 – Edit
In case one of the polynomial transfer function has been selected
The existing polynomial coefficients in the transmitter will be used. The coefficients can be set or modified
only by HHT and PC.
Set the Transfer function on the transmitter by CoMeter
The Transfer function setting by CoMeter is available with the 695 Field Indicator. Please refer to the device
manual for the appropriate operations.
Set the Transfer function on the transmitter by HHT
The Transfer function setting by Hand Held Terminal is available. Please refer to the d evice manual for the
appropriate operations.
Set the Transfer function on the transmitter by PC
The Transfer function setting by PC is available using dedicated Software. ABB can provide the references
and the Software. Please refer to the Software instructions for the appropriate operations.
Set the Transfer function on the Meters
The Transfer function on the Meters works only on the meters reading and not on the trasmitter output.
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