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ENGLISH

Direct

mode: the output is active

when the measured value is

lower

than the one selected in the setpoint,
the metering pump injects Chlorine.

Setpoint 2 is set for operations in

Reverse

mode: the output is active

also the measured value is

higher

than the one selected in the
setpoint, the metering pump injects
a Chlorine reducing agent.

The unit has an

ON-OFF

mode which switches on or off (if the reverse mode

is ON) The output relays of Constant / ON-OFF metering pumps or other
ON-OFF equipment.

BY SELECTING

“

ON-

OFF”

THE NEXT STEP IS



“MIN ALARM”

(ONLY SET POINT1)

*Modular pulses, also known as PWM “pulse width modulation”, support a proportional mode on each ON

-OFF

setpoint, activating the corresponding pulses on the output relays based on the measured value and always
relating to the previous selected settings.
The default activation point is

0.050 ppm

(2 Cl ppm);

0.50 ppm

(range 20 Cl ppm, 20 Cl ppm (Total), 0-10ppm

CLC Cell) (see pg.11-12).

SELECTING

“ON

OFF”

THE NEXT PROGRAMMING STEO IS



“HYSTERESIS”

SELECTING

“PROPORTIONAL”

REQUIRES PROGRAMMING THE NEXT STEPS

PWM PROPORTIONAL MODE WITH TIMED PULSES

Pulse width:

pulses are timed ON and OFF based on the distance from the selected setpoint, programmable, example: with a selected chlorine

range at 2 Cl ppm, if the selected setpoint is 0.500 Cl ppm and the measured value is 0.400 Cl ppm, the

PWM

mode starts after reaching 0.450

Cl ppm with Time/Pause pulses and decreasing the active time while reaching the setpoint

(see pg

.11-12).

Cycle Time:

the PWM mode has a 60 second cycle (programmable), example: setpoint is 0.500 Cl ppm, active

time 60 sec - pause time = 0 sec; 0.475 Cl ppm active time = 30 sec -

pause time = 30 sec… as a consequence

the active time decreases while reaching the setpoint. The cycle time depends on many variables, such as:
distance from the injection point of the system to be treated, how fast or slowly the setpoint must react, chemical
concentration, etc.

MIN Active Time:

programmable. Defines the minimum time for which PWM is active; prevails over the selected

settings. The pulse modulation function is adjusted with 3 functions according to the following formula: Active
Time in accordance with the selected formula = (measured value - setpoint) / (period width * cycle time). If the
result of the formula is

of that selected with MIN Active Time, the latter prevails on the former.

BY SELECTING

“ON

-OFF

” THE NEXT PROGRAMMING STEPS ARE AS FOLLOWS

……

FUNCTION NOT AVAILABLE SIMULTANEOUSLY WITH PROPORTIONAL MODE
Hysteresis

is useful during operations to adjust the setpoints in ON-OFF mode and is used to enable or disable the output relay when the

selected hysteresis has been achieved. Hysteresis is useful when there are too many quick swings around the setpoint, that might damage the
connected device. By increasing hysteresis it is possible to move away from the setpoint in accordance with the required value.

MENU SETPOINT 1

Metering

Direc t



EXPERT MENU



MENU SETPOINT 2

Metering

Revers e



EXPERT MENU

