Installation & Operation Manual
6 – ANALOG OUTPUT
A linear analog 4-20 mA signal is generated according to the Flow Rate with a 10 bits resolution. The settings for Flow Rate
(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. When disabled, a 3.5 mA will be generated if a power supply is
available.
MINIMUM FLOW RATE
62
Enter here the flow rate at which the output should generate the minimum signal (4 mA)—in most
applications, at flow rate "zero". The number of decimals displayed depends upon SETUP 23. The
time and measuring units (L/min for example) are dependant upon SETUP 21 and 22 but are not
displayed.
MAXIMUM FLOW RATE
63
Enter here the flow rate at which the output should generate the maximum signal (20 mA)—in
most applications at maximum flow. The number of decimals displayed depends 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 16 mA. When the flow is less than the required rate, the current will be the minimum
signal (4 mA).
Examples:
4 mA
(SETUP 62)
20 mA
(SETUP 63)
CUTOFF
(SETUP 64)
REQUIRED RATE OUTPUT
0 gpm 100 gpm 2% (100-0)*2% = 2.0 gpm 4+(16*2%) = 4.32 mA
20 gpm 800 gpm 3.5%
(800-20)*3.5%= 27.3
gpm
4+(16*3.5%) = 4.56 mA
TUNE MIN / 4 mA 65 The initial minimum analog output value is 4 mA. However, this value might differ slightly due to
external influences such as temperature. The 4 mA 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 4 mA. The current can be increased / decreased
with the arrow-keys and is directly active. Press ENTER to store the new value.
The analog output value can be programmed “upside-down” if desired, so 20 mA at minimum flow
rate for example!
TUNE MAX / 20 mA 66 The initial maximum analog output value is 20 mA. However, this value might differ slightly due to
external influences such as temperature for example. The 20 mA 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 20 mA. The current can be increased or decreased
with the arrow keys and is directly active. Press ENTER to store the new value.
The analog output value can be programmed “upside-down” if desired, so 4 mA at maximum flow
rate for example!
Page 17 March 2013
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