Hanna Instruments HI 23 - Manual (Page 7)

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If the Pt 100 has more than 2 wires, con-
nect the two wires of one end to pins 9
and 10 (pin 9 is an auxiliary input to
compensate for the cable resistance) and
one wire from the other end to pin 8.
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.
Note All external cables to be connected to the right panel should
end with cable lugs.
• Analog output: In the models where it
is available, connect an external recorder
with a 2-wire cable to these terminals
(#2 on page 8) paying attention to the
correct polarity. A wide variety of output
signals, either in V or in mA, is avail-
able to fit most standards. Terminal 5 is the voltage output,
terminal 6 is the analog output common and terminal 7 is
the current output.
• Contact 1 and 2: Connect the dosing
devices to these terminals (#8 and #9
on page 8) in order to activate and de-
activate them according to the selected
control parameters.
• mA Input: to switch to mA input signal
from a conductivity transmitter (e.g.
HI8936 or HI98143 series) see the setup
procedure (code 6).
• Power Supply: Connect a 3-wire power
cable to the terminal strip, while paying
attention to the correct line (L), earth (PE)
and neutral (N) terminal connections.
Power: 230VAC - 50 mA.
Line Contact: 200mA fuse inside.
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 8. HI7639D is a conductivity probe with built-in tem-
perature sensor.
• Pt 100 Terminals (to be used only if the EC probe is
without Pt 100): connect to these contacts (#3 on page 8)
the Pt 100 temperature sensor for automatic temperature
compensation of measurement. Follow the below diagram
for connecting a 3-wire Pt 100 sensor as HI5001/5:
Color Pin #
GRAY 8
BROWN 9
YELLOW 10
If using a different Pt 100, separated from the conductivity
probe, connect the cable shield to pin 11, and the other
wires as explained below.
In the case of a 2-wire sensor connect
the Pt 100 to pins 8 and 10, and short
pins 9 and 10 with a jumper wire.