Hanna Instruments HI 504 - Manual (Page 7)

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• Electrode: Connect the pH or ORP electrode to the BNC
socket (#1 at page 9).
To benefit from the differential (symmetrical) input, connect
the proper electrode wire (if available) or a cable with a
potential matching pin (grounding bar) to the relevant ter-
minal (#2 at page 9) and enable the differential input
through the setup code I.04.
Note When it is not possible to immerse the Potential Matching Pin
together with the pH electrode in the solution (asymmetrical
input), disable the differential input through the setup code I.04.
In this case, detach the Potential Matching Pin from its con-
nector. Failure to do so may cause damage of the reference
electrode.
• Pt 100/Pt 1000 Terminals: these contacts (#4 at page 9)
connect the Pt 100/Pt 1000 temperature sensor for auto-
matic temperature compensation of pH measurement. In
the case of shielded wire, connect the shield to pin 4.
In the case of a 2-wire sensor con-
nect the Pt 100/Pt 1000 to pins 1
and 3, and short pins 2 and 3 with
a jumper wire.
If the Pt 100/Pt 1000 has more than
2 wires, connect the two wires of
one end to pins 2 and 3 (pin 2 is
an auxiliary input to compensate
for the cable resistance) and one
wire from the other end to pin 1.
Leave the fourth wire unconnected, if present.
Note The instrument automatically recognizes the sensor type (Pt
100 or Pt 1000).
• Analog Outputs: when using shielded cable, if the shield
is not connected at the other end of the cable, then con-
nect it to the “+” terminal, otherwise leave it floating.
Note All cables connected to rear panel should end with cable lugs.
Note A circuit breaker (rated 10A max.) must be connected in
close proximity to the equipment, and in a position easy to
reach by the operator, for disconnection of the instrument
and of all the devices connected to the relays.
INSTALLATION
• Input power: Connect a 3-wire power cable
to the terminal strip line (L), earth (PE) and
neutral (N) terminal connections.
Power: 100VAC-120mA / 115VAC-100mA / 230VAC-50mA.
Line Contact: 400mA fuse inside.
PE must be connected to ground; leakage current 1mA.
Refer to diagram on page #9