HF110AEN_v0501_04
Page 18
6 - ANALOG OUTPUT
A linear analog (0)4-20mA or 0-10V signal is generated according to the flowrate with a 10 bits
resolution. The settings for flowrate (SETUP - 2) influence the analog output directly.
The relationship between rate and analog output is set with the following functions:
DISABLE / ENABLE
61
The analog output can be disabled.
In case of a passive analog output type AP, 3.5mA will be generated if a
power supply is available but the output is disabled.
MINIMUM FLOWRATE
62
Enter here the flowrate at which the output should generate the minimum
signal (0/4mA or 0V) - in most applications at flowrate "zero".
The number of decimals displayed depend upon SETUP 23.
The time and measuring units (L/min for example) are dependant upon
SETUP 21 and 22 but are not displayed.
MAXIMUM FLOWRATE
63
Enter here the flowrate at which the output should generate the maximum
signal (20mA or 10V) - in most applications at maximum flow.
The number of decimals displayed depend upon SETUP 23.
The time and measuring units (L/min for example) are dependant upon
SETUP 21 and 22 but cannot be displayed.
CUT-OFF
64
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, (or 20mA or 10V).
When the flow is less than the required rate, the current will be the
minimum signal (0/4mA or 10V).
Examples:
4
M
A
(
SETUP
62)
20
M
A
(
SETUP
63)
C
UT
-
OFF
(
SETUP
64)
R
EQUIRED RATE
O
UTPUT
0 L/min
100 L/min
2%
(100-0)*2% = 2.0 L/min
4+(16*2%) = 4.32mA
20 L/min
800 L/min
3.5%
(800-20)*3.5%= 27.3 L/min
4+(16*3.5%)=4.56mA
TUNE MIN / 4MA
65
The initial minimum analog output value is 0/4mA or 0V. However, this
value might differ slightly due to external influences such as temperature
for example. The 0/4mA or 0V value can be tuned precisely with this
setting.
Before tuning the signal, be sure that the analog signal is not being
used for any application!
After pressing PROG, the current will be about 4mA (or 0mA / 0V). The
current can be increased / decreased with the arrow-keys and is directly
active. Press ENTER to store the new value.
Remark: the analog output value can be programmed “up-side-down” if
desired, so 20mA at minimum flowrate for example!
TUNE MAX / 20MA
66
The initial maximum analog output value is 20mA (or 10V). However, this
value might differ slightly due to external influences such as temperature
for example. The 20mA value (or 10V) can be tuned precisely with this
setting.
Before tuning the signal, be sure that the analog signal is not being
used for any application!
After pressing PROG, the current will be about 20mA. The current can be
increased / decreased with the arrow-keys and is directly active. Press
ENTER to store the new value.
Remark: the analog output value can be programmed “up-side-down” if
desired, so 4mA at maximum flowrate for example!
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