Model 001 & 002 Flowmeter Operating Manual
MANUAL-1550859975-1 | issue: 1.1
©
2021
– Valeport Ltd
Page | 17
5.9.3.2 Polynomial Fits.
In a terminal emulation program (for example TERMINAL in Windows), set the communications to
4800 baud, 8 data bits, 1 stop bit, 0 parity bits. Also, check that the correct comms port on the PC
is being used. If necessary, check that the Local Echo is On, or you will not be able to see what
you are typing appear on the screen.
With the 0012B CDU connected to the PC via the interface lead provided, select USER CAL from
the OPTIONS MENU and then SET USER CAL. Check the PC connection.
In the terminal emulation program, the message 'Enter Calibration Data' appears.
The calibration data should then be entered as follows:-
#CODE Ident_number C7 C6 C5 C4 C3 C2 C1 C0<cr>
where
#CODE
=
the set calibration function code see Section:
Ident_number
=
Calibration Function No. For a polynomial fits, this will be 2. (See
Table 1 above).
C<number>
=
X Coefficient factor
(X7 * C7) +( X6*C6) + (X5 * C5) + (X4 * C4) + (X3 * C3) + (X2 * C2) + (X1 * C1) + C0
All polynomial fits are considered to be seventh order fits (i.e. of the format above), and therefore
sufficient coefficients must always be entered to ensure correct calculation of the calibration factor.
For polynomial fits less than seventh order, the unused parameters should be filled in with zeros.
For example, your calibration equation may be:
V = 0.001n5 + 0.003n4 + 0.6n3 + 7.03n2 + 0.6n +4.1
where V is velocity in m/s and n is revolutions per second.
To enter this calibration in OTHER3, the following would be typed. Note the space after each
number:
#003 2 0 0 0.001 0.003 0.6 7.03 0.6 4.1
To change the name of the meter, type the correct #CODE followed by the new name (upper and
lower cases are recognised). For example, to change the name from OTHER3 to BFM001, enter:
#013 BFM001
When all required data has been input, enter #000, and the 0012B will automatically return to the
Options Menu.