15Instruction Manual
3. Press
ACID
PUMP A
to save programmed Set Point.
4. Press
or to program Δ pH (Hysteresis)
period for relay. In this example, ‘Pump A’ will
turn ON at a pH of 8.0 (set point + Δ pH). ‘Pump
A’ will turn OFF when pH drops to 7.5.
Pump A
7.5
pH
Set Point
0.5
ΔpH
‘Pump B’ (Base Pump) is programmed in a similar
way.
In this example, ‘Pump B’ will turn ON at a pH of
3.5 (set point - Δ pH) and will turn OFF when pH
reaches 4.0.
It is highly recommended that the hysteresis (pump
OFF function) be used to prevent relay chatter.
The function of the hysteresis is to prevent pump
relay chattering. It operates by allowing the pump to
be turned ON when the control point plus (or minus)
the hysteresis value has been met, but does not
allow the pump to turn OFF until the control point
has been met. The chosen value will be used for
both upper and lower set points.
The hysteresis, or dead band, designates how
many pH units beyond set point the pump runs
before turning OFF. Any value from 0 to 14.00 is
acceptable. If use of this function is undesirable,
set it to 0.
Example: If the lower set point is pH 4.0 and the
hysteresis has been set at 0.50, a falling pH will
cause the pump to activate at pH 3.50 and it will
run until reaching set point (4.0).
Hysteresis (Dead Band) 0.5 pH
Pump OFF
Pump ON
Lower Set Point
2
4 6
8 10
Upper Set Point
Without Dead Band
or
Pump Off Delay
Pump ON
Pump OFF
Lower Set
Point
3.5 4.5
4
5
SECTION 4 - OPERATION
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