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8.3 “PWM” proportional pH & proportional water meter (relay)
This mode is valid for “pH relay” and “pH relay 2” outputs only. Pulse-width modulation (PWM) of a signal or power
source involves the modulation of its duty cycle, to either convey information over a communications channel or
control the amount of power sent to a load.
This mode works over a settable (0 to 100 seconds) time to switch on or off selected output.
During this time if reading value will move towards a set value (on or off) the PWM will operate the output on
timered basis. Reaching the set value the PWM will permanently leave on or off the output.
Parameters to set for this mode are:
Unit Value + %: (time activity towards set value. 0% means 0 seconds. 100% means 100 seconds.)
pH range: two pH values within PWM operates.
For example: set first pH value at 8.00 = 100% and second pH value at 4.0 = 0%.
For reading values ≥ to 8.00 the output will be permanently ON.
For reading values ≤ 4.0 the output will be permanently OFF.
For reading value of 7.00 the output will be OFF for 25 seconds, ON for 75 seconds.
For reading value of 6.00 the output will be OFF for 50 seconds, ON for 50 seconds.
Proportional Water Meter
Proportional mode can also be set into PROP+WM mode.
This option allows to regulate proportional input based on
flow detected by water meter at set percentual values.
e.g.: reading at 9 will have an output of 50 seconds on and
50 seconds Off (50% on 100 seconds base). Adding the
proportional flow from the water meter with parameters
set between 20 % (at 0mc/h) and 100% (at 8mc/h) results
will be that (as example):
At 4 mc/h will have a working period of 30 seconds ON
and 70 seconds OFF (60% of 90P/m)
60% is the middle value between 20% and 100% for
reading of 4mc/h
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