Specifications

Transmitter pH M300 V20 18

4.2 Connection of power supply

All connections to the transmitter are made on the rear panel of all models.

Be sure power to all wires is turned off before proceeding with the installation. High voltage may be

present on the input power wires and relay wires.

A two-terminal connector on the rear panel of all M300 models is provided for power connection. All M300

models are designed to operate from a 20-30 VDC or a 100 to 240 VAC power source. Refer to specifications

for power requirements and ratings and size power wiring accordingly.

The terminal block for power connections is labeled “Power” on the rear panel of the transmitter. One terminal is

labeled

– N for the Neutral wire and the other +L for the Line (or Load) wire. There is no earth ground terminal

on the transmitter. For this reason the internal power wiring within the transmitter is double insulated and the

product label designates this using the  symbol.

4.2.1 1/4DIN housing (panel mount)

1 Connection of power supply

2 Terminal for sensor

Printed in Switzerland 52 121 304