Hanna Instruments HI 8711 - Manual (Page 21)

21
• •• •• Connect a 3-wire cable to the power supply
terminal according to the voltage level as
indicated, and pay particular attention to
the correct line, earth and neutral connections.
• •• •• For BNC electrodes, connect the electrode
to the BNC plug on the rear panel.
The instruments are equiped with differential
input. To benefit from differential input
advantages, connect the proper electrode
wire (if available) or a cable with a potential
matching pin, to the Matching Pin (terminal 4).
When the Matching Pin cannot be immersed
together with the electrode in the solution,
disable the differential input by shorting
the Electrode reference and the Matching
Pin terminals with a jumper wire (terminals
3 and 4).
• •• •• For amplified electrodes connect the
electrode pH input wire to the AMP INPUT
terminal (1), the electrode power suply wires
to the ±5 V terminals (7, 8) and the
electrode reference wire to the reference
terminal (5). Make a short between Reference
and Matching pin terminals (5, 6).
If the amplified electrode is provided with BNC connector, connect
the electrode to the BNC input and the power supply wires to the
±5V terminals (7, 8).
• •• •• For Inputs from transmitter, connect the 2
signal wires of the analog transmitter to the
"INPUT TRANSMITTER" terminals (7, 8), while
paying attention to the indicated polarity.
Note: Only one of BNC, AMP INPUT or INPUT
TRANSMITTER connectors can be used at
one moment. Leave the other two inputs
unconnected.
• Recorder output terminals: these contacts
are used for connection to a recorder. The
output can be 0-20 mA or 4-20 mA depending
on the connection, and is proportional to
the pH or ORP reading.
INITIAL PREPARATION INITIAL PREPARATION INITIAL PREPARATION INITIAL PREPARATION INITIAL PREPARATION