FW_F112A_v1702_02_EN
Page 13
F
UNCTION
(
SETUP
51)
S
PAN
(
SETUP
13/24)
R
EQUIRED
CUT
-
OFF
C
UT
-
OFF
(
SETUP
53)
R
EQUIRED OUTPUT
interpolation 450 L/min
25 L/min
25/450 x 100%=5.5%
16mA x 5.5% + 4mA = 4.88mA
square root
450 L/min
25 L/min
(25/450)
2
x 100%=0.3%
16mA x 0.3% + 4mA = 4.05mA
CALIB-LO
54
This setting is used to calibrate the input value for (0)4mA as the signal
from the flowmeter might not be exact 4.0 mA (or 0.0 mA) at flow rate
zero. This function will measure the real output value at flow zero.
Be very sure that the offered signal is correct before the calibration
is executed as this function has major influences on the accuracy of
the system!
After pressing PROG, three settings can be selected:
CALIB: with this setting, the input will be calibrated with the actual
"(0)4mA" value. After pressing enter, CAL SET will be shown as soon
as the calibration is completed. From that moment, the analog value
must be more than the calibrated value before the signal will be
processed.
DEFAULT: with this setting, the manufactures value is re-installed.
CAL SET: to select the last calibrated value.
CALIB-HI
55
This setting is used to calibrate the input value for 20mA as the signal
from the flowmeter might not be exact 20.0 mA at maximum flow rate.
This function will measure the real output value at maximum flow rate.
Be very sure that the offered signal is correct before the calibration
is executed as this function has major influences on the accuracy of
the system!
After pressing PROG, three settings can be selected:
CALIB: with this setting, the input will be calibrated with the actual
"20mA" value. After pressing enter, CAL SET will be shown as soon
as the calibration is completed. From that moment, the analog value
must be less than the calibrated value for a reliable measurement.
DEFAULT: with this setting, the manufactures value is re-installed.
CAL SET: to select the last calibrated value.
3.1.7.
EXPLANATION OF SETUP MENU 6 - LINEARIZE
The linearization function is available to approach the real flow curve better as with the general
K-Factor (KF0). This to obtain a more accurate flow rate, total and accumulated total as well as the
analog and pulse output at any flowmeter frequency. A maximum of 15 linearization-positions can be
entered while the interpolation will calculate any other position in-between.
For each linearization position, the percentage of the signal and a Meter Factor (MF) must be
entered. The lowest percentage and MF you enter will be valid from (0)4mA. The highest percentage
and MF will be valid till 20mA. It is advised to enter the percentages in increasing order, however it is
not necessary.
Please have a look at following example to understand the calculation and the method of
linearization:
