10
•
Power Supply: Connect a 3-wire power cable to the terminal
strip, while paying attention to the correct live (L), earth (PE)
and neutral (N) terminal connections.
Power: 115 Vac -100 mA / 230 Vac - 50 mA.
Live Contact: fused inside 400 mA.
PE leakage current 1 mA; this contact must be connected 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 according 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.
If the Pt 100 has more than 2 wires, connect the two wires of one end to pins 7 and
8 (pin 7 is an auxiliary input to compensate for the cable resistance) and one wire
from the other end to pin 6. Leave the fourth wire unconnected, if present.
Note
If the meter does not detect the temperature probe, it will switch automatically to manual
temperature compensation with the temperature adjustable through the up and down
arrow keys. The “°C” symbol will blink on the LCD.
