Configuration / setup
November 2014
AC_F110_BA_02_1346
Page 11
6.4.6
ANALOG OUTPUT - 6
A passive linear 4-20mA output signal is generated according to the flow rate with a 10 bit resolution. The settings for flow
rate (SETUP - 2) influences the analogue output directly. When the analogue output is not used, please make sure that setting
61 is disabled, else the battery lifetime will be decreased significantly! The relationship between rate and analogue output is
set with following functions:
Enable / disable - 61:
As the D/A converter has a relatively high power consumption, it is strongly advised to power the unit externally. When the
analogue output will not be used, select "disable" to switch-off the converter.
Minimum flow - 62:
Enter here the flow rate which the output should generate a 4mA signal (mostly at rate "zero"). The number of decimals
displayed is according to setup 24. The time and measuring units (L/min e.g.) are according setup 21 and 22 but cannot be
displayed.
Maximum flow - 63:
Enter here the flow rate which the output should generate a 20mA (mostly at maximum possible rate). The number of
decimals displayed is according to setup 24. The time and measuring units (L/min e.g.) are according setup 21 and 22 but
cannot be displayed.
6.4.7
PULSE OUTPUT - 7
One open collector output is available to generate a pulse per quantity. This frequency output is programmable and has a
maximum frequency of 20Hz.
Pulse width - 71:
When the pulse is used to drive an electromechanical counter, a long pulse - 100msec - will be required. Consequently, the
maximum output frequency is 5Hz. For electronic counters a frequency of max. 20Hz. is offered with a short pulse of 25msec.
NOTE:
When the frequency goes out of range (when the flow rate increases for example) an internal buffer will be used to "store the
pulses": As soon as the flow rate goes down, the buffer will be "emptied". It might be that pulses will be missed due to a buffer
overflow, so it is advised to program setup 71 within its range. It is advised to select "OFF" when the pulse output is not used.
Pulses per – 72:
According to the settings for total, a pulse will be generated every X quantity. Enter here this quantity while taking the
decimal position and measuring unit into account.
