Tecfluid MT03L Series, Инструкция по эксплуатации

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3.2.4 Analog output wiring
Terminal
1 mA (positive, power supply for a passive device)
2 mA input
3 mA (negative, input from an active device)
This input is compatible with any flow rate transmitter that provides a 4-20 mA output.
The impedance is 120 Ω. The input has a protection in order to limit the voltage applied to
the circuit.
In the event that the current transmitter is passive, for example a 2-wire transmitter, it is
necessary to power the current loop. It is done by connecting the transmitter to terminals 1
and 2.
If the current transmitter is active, the connection is between terminals 2 and 3.