Connecting an Aranet Transmitter

Aranet 0-10 VDC Transmitter, Aranet 4-20mA Transmitter, and Aranet Dry Contact Pulse Counter have a 2-wire cable for connection:

Wires' colours are arbitrary; sensors are unipolar and have protection against wrong connections.

Anyway, based on the PCB design of the 0-10V Transmitter and Pulse sensor, you can consider the Brown wire as the Ground (GND) and the White wire as the Signal:

Please also note Aranet 4-20 mA Transmitter voltage drop of 5V at 20mA. So, pay attention to the connected sensor's power requirements in circuits with a lower (12...18 V) power supply voltage.