FW_F112P_v1901_02_EN.docx
Page 15
FREQUENCY /
M-FACTOR
61 TO 6F
The frequency is shown at the bottom line of the display. The maximum
frequency is 9999.9 Hz. With value 0.0Hz, the M-Factor is disabled. The
M-Factor (MF) is shown at the top-line of the display. The minimum value
to be entered is 0.000001 and the maximum value is 9.999999.
The MF is mostly a figure around 1.000000, like 0.945354 or 1.132573
and always has six decimals, but the decimal separator is not shown.
LINEARIZE
6G
This setting is used to enable or disable the linearization function.
DECIMALS
FREQUENCY
6H
This setting is used to set the amount of digits behind the decimal point for the
frequency.
3.1.8.
EXPLANATION OF SETUP MENU 7 - ANALOG OUTPUT
A linear 4-20mA signal (option AB: 0-20mA or option AU: 0-10V) output signal is generated that
represents the flowrate. The settings for the flow rate influence the analog output directly. The
relationship between the flow rate and the analog output is set with the following settings.
OUTPUT
71
If the analog output is not used, select disable to minimize the power
consumption (e.g. save battery life-time).
Option AP: When a power supply is available but the output is disabled, a
3.5mA signal will be generated.
RATE-MIN
72
Enter here the flow rate at which the output should generate the minimum
signal (0)4mA or 0V - in most applications at zero flow. The number of
decimals shown depend upon setup 23. The engineering units/time (e.g.
L/min) are dependent upon setup 21 and 22.
RATE-MAX
73
Enter here the flow rate at which the output should generate the maximum
signal (20mA or 10V) - in most applications at maximum flow. The number
of decimals shown depend upon setup 23. The engineering units/time
(e.g. L/min) are dependent upon setup 21 and 22.
CUT-OFF
74
To ignore leakage of the flow for example, a low flow cut-off can be set as
a percentage of the full range of 16mA, 20mA or 10V.
When the flow is less than the required rate, the current will be the
minimum signal (0)4mA or 0V.
Example:
Calculate the cut-off.
Rate-min: 0L/min [4mA], Rate-max: 100 L/min [16mA], Cut-off: 2%
Required rate [L/min]:
(rate-max - rate-min)*cut-off: (100-0)*2%=2.0L/min
Output [mA]:
rate-min + (rate-max*cut-off): 4+(16*2%)=4.32mA
TUNE-MIN
75
The (0)4mA or 0V value can be tuned precisely with this setting. The
initial minimum analog output value is (0)4mA or 0V. However, this value
might differ slightly due to ambient influences such as temperature for
example.
Before tuning the signal, make sure that the analog signal is
idle (not used) for any application!
After pressing PROG, the current will be about 4mA (0mA or 0V). The
current can be increased / decreased with the arrow keys and is directly
active. Press ENTER to store the new value.
If required, you can program the analog output 'up-side-down'. The
(0)4mA or 0V
represents the maximum flow rate and the 20mA or 10V
represents the minimum flow rate.
