Manual FLOW 38 Page 20 (total 54) COMAC CAL s.r.o.
OUT1 / OUT2
Impulse outputs / FlowSwitch / Status
OUT1 and OUT2 outputs are freely configurable and implemented by the optocoupler with an NPN
switching transistor. Limit parameters of this optocoupler are 80V/50mA/100mW max. The output can be
connected as a passive one or active one when terminals 11 and 12 are used. In active mode, the meter makes
use of its internal galvanically separated 16V power supply. In this case, the switch voltage for logical high
is 16V with the recommended current consumption of approx. 2mA with regard to optocoupler transfer. The
output in off-state is found in high impedance state and so it is necessary to use a pull down or pull up
resistors for defining the steady-state level.
Configuration:
1) The Impulse output is used for remote transmission of volumetric impulses. The conversion constant is
arbitrarily variable using buttons or user software. The adjustment must be carried in such a manner that the
frequency at maximum flow rate fout<400Hz.
2) The FlowSwitch is used for flow rate value monitoring. When the set limit flow rate is exceeded, the
contact will be switched (contact making/breaking). The level of contact making and contact breaking is
different – the contact has hysteresis The hysteresis is adjustable in %.
3) The Status output is used for evaluation of meter’s status – failure, warning, failure+warning.
Wiring connection examples – passive output: Terminal board wiring
connection:
Examples of connection – active output: Terminal board connection:
Due to CTR≈100% and If=2.5mA, it is suitable to select collector current up to 2.5mA.
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