33
•
Connect a 3-wire power
cable to the 4-screw termi-
nal strip; according to the
voltage level as indicated and
pay particular attention to
the correct live, earth and
neutral terminal connections.
•
For Model E, HI 931500,
HI 931501 and HI 931500
connect the pH or ORP elec-
trode to the BNC marked
"ELECTRODE INPUT".
•
For Model T, connect the 2
signal wires of the pH or
ORP transmitter to the ter-
minal marked "IN/OUT
TRANSMITTER" paying par-
ticular attention to the indi-
cated polarity.
•
Recorder Terminals: these
contacts are the output ter-
minals for connection to a
recorder. The output is from
0 to 20 mA / 4 to 20 mA as
indicated and is proportional
to the measured pH or ORP
value.
•
PT 100 Terminals: these
contacts connect the PT 100
temperature sensor for au-
tomatic temperature com-
pensation of pH measure-
ment. If temperature com-
pensation is not required,
connect a 110 Ohm, 0.25W
resistor across the terminals
(equivalent to a fixed tem-
perature of 25°C/77°F).
FUSE
FUSE
2
2
0
11
0
L
ELECTRODE
INPUT
INITIAL PREPARATION
PT100
mA OUT
+
-
