Flomec F116-P, Руководство пользователя

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Page 17
FL_F116P_v1702_01_EN
84 cut-off 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
85
tune-min 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.
86
tune-max The 20mA or 10V value can be tuned precisely with this setting. The initial
maximum analog output value is 20mA or 10V 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 20mA or 10V. 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.
87 filter This setting is used to stabilize the output signal. With the help of this digital filter
a more stable but less actual representation of the flow rate can be obtained.
The filter principal is based on three input values: the filter level (01-99), the last
calculated flow rate and the last average value. The higher the filter level, the
longer the response time on a value change will be.
filter value R
ESPONSE TIME ON STEP CHANGE OF ANALOG VALUE
. T
IME IN SECONDS
influence
01
02
03
05
10
20
30
50
75
99
50%
filter disabled
0.1 sec
0.3 sec
0.5 sec
0.9 sec
1.8 sec
2.6 sec
4.4 sec
6.5 sec
8.6 sec
75%
filter disabled
0.3 sec
0.5 sec
0.9 sec
1.8 sec
3.5 sec
5.1 sec
8.6 sec
13 sec
17 sec
90%
filter disabled
0.5 sec
0.8 sec
1.4 sec
2.8 sec
5.6 sec
8.5 sec
14 sec
22 sec
28 sec
99%
filter disabled
0.9 sec
1.5 sec
2.6 sec
5.5 sec
11 sec
17 sec
29 sec
43 sec
57 sec