User Guide

10
• Power Supply: Connect a 3-wire power cable
to the terminal strip, while paying attention
to the correct live (L), earth (PE) and neu-
tral (N) terminal connections.
Power: 115VAC -100 mA / 230VAC - 50 mA.
Live Contact: fused inside 200mA.
PE leakage current 1 mA; this contact must be con-
nected to ground.
• Conductivity input: the default input is from conductivity
probe. Connect the EC probe to the terminals #10 on
page 7. Connect the cable shield to pin 1, and the other
four wires according to the following table:
Color Pin #
GREEN 2
WHITE 3
RED 4
BLUE 5
• Pt 100 Terminals: these contacts (#9 on page 7) connect
the Pt 100 temperature sensor for automatic temperature
compensation of measurement. The HI7639 EC/TDS probe
has a built-in 3-wire Pt 100 sensor to be connected ac-
cording to the following table:
Color Pin #
GRAY 6
BROWN 7
YELLOW 8.
If using a different Pt 100, separated from the conductivity
probe, connect the cable shield to pin 9, and the other
wires as explained below.
In the case of a 2-wire sensor connect
the Pt 100 to pins 6 and 8, and short
pins 7 and 8 with a jumper wire.