Tecfluid Converter XL1, Инструкция по эксплуатации

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The digital output is opto-isolated. The terminals are the collector and emitter of a NPN
bipolar transistor.
If the equipment is configured as pulse mode (see page 26), the led will alternate between
green and red if there is a flow, and will remain green if there is no flow.
If it is configured as alarm mode (see page 26), the led will light red when the alarm is
activated and green when it is not.
In the case of using inductive loads, in order to protect the output transistor, the use of free
wheeling diodes is required.
Example. Connection with the load at the collector
Example. Connection with the load at the emitter
Coil