34
• HI 8710 and HI 931500 are single dosage
controllers for dosing either acid or alka-
line liquid.
If you plan to dose acid (e.g.
in Hexavalent Chromium re-
duction), make an open cir-
cuit between ACID/BASE
selection terminals (see rear
panel descriptions #3 at
page 12-13 and #4 at page 23).
If you plan to dose alkaline
(e.g. in Cyanide oxidation
product), make a short cir-
cuit across the above men-
tioned terminals.
• HI 8720 and HI 932500 are single dosage
controllers for dosing either oxidant or re-
ductant liquid.
If you plan to dose oxidants
(e.g. in cyanide oxidation),
make an open circuit be-
tween oxidation/reduction
selection terminals (see rear
panel descriptions #3 at
page20-21 and #4 at page 28).
If you plan to dose reduc-
tants (e.g. in hexavalent
chromium reduction), make
a short circuit across the
above mentioned terminals.
• Set Contacts (HI 8710,
HI 8720, HI 931500 and
HI 932500 only): these con-
tacts (maximum 2A, 220 V)
are for connection to the
dosing pump to dose either
acidic or alkaline liquids (HI 8710 and
HI 931500 only) or to dose either oxidizing
or reducing chemicals (HI 8720 and
HI 932500 only). These contacts act only
as a switch for the power to the drive.
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