Steiel EF110 pH Manual De Instalación, Programación Y Mantenimiento página 19

1 = ON  the pump is always on, independently from measured value: this option is used
to manually force the dosage, for example during the plant start-up or maintenance
2 = ON/OFF acid  this option is typically used for acidification; the pump activates when
the measurement exceeds the "working threshold + ½ hysteresis" level, and deactivates
when the measurement falls below the "working threshold – ½ hysteresis" value
3 = Proportional acid  the pump is definitely active when the measurement is greater than
the "working threshold + ½ hysteresis" level, and definitely off when measurement is lower
than the "working threshold – ½ hysteresis" value, while for measurements between these
limits, the operating time of the pump is proportional to the distance of measurement from
the limits. The time base is fixed (90 seconds) and operation follows the trend shown in the
table below:
Measurement = pH ; Working threshold = 7.20 pH ; Hysteresis = 0.40 pH
Measure
% dosage
Pump ON
Pump OFF
4 = ON/OFF chlorine  this option is typically used for chlorination or alkalization; the pump
activates when the measurement is lower than the "working threshold – ½ hysteresis"
value, and deactivates when the measurement exceeds the "working threshold + ½
hysteresis" level
5 = Proportional chlorine  the pump is definitely active when the measurement is lower
than the "working threshold – ½ hysteresis" value, and definitely off when measurement is
greater than the "working threshold + ½ hysteresis" level, while for measurements between
these limits, the operating time of the pump is proportional to the distance of measurement
from the limits. The time base is fixed (90 seconds) and operation follows the trend shown
in the table below:
Measurement = ORP ; Working threshold = 680 mV ; Hysteresis = 20 mV
Measure
% dosage
Pump ON
Pump OFF
P5: This parameter allows to set the working threshold used when the pump operates in
automatic control
P6: This parameter represents the intervention hysteresis around the working threshold; in the
case of ON/OFF controls it can be set between zero and 2.00 pH (or between zero and 200
mV), while in the case of proportional controls the hysteresis must have a value between
0.20 and 1.00 pH (or between 20 and 100 mV).
P7: At the device start-up, some electrodes require a stabilization (or polarization) time, during
which the measurement is not reliable. This parameter allows to set a delay at start-up (in
minutes), during which the pump is off and the display alternates between the
measurement and the "PAU" message.
Typically, in the case of pH electrode a delay of 1 minute is sufficient, while in the case of
redox electrode it is recommended to set a delay of at least 20 minutes.
Sometime this standby time is also useful to compensate for hydraulic delays that can
occur at the plant start-up. Once the set time has elapsed, the pump begins to operate
normally.
P8: This parameter allows to set a time limit within which the measure must return to the
working threshold value (P5), otherwise an alarm is generated. A time between 0 (feature
disabled) and 600 minutes (10 hours) can be set.
The alarm time count begins when the system detects a measurement out of range, and
automatically resets when the measure returns within the threshold value. If the
EF110_r1.0 – 10/2019
<= 7.00 7.10
0 % 25 %
never 23 seconds
always 67 seconds
<= 670 675
100 % 75 %
always 67 seconds
never 23 seconds
7.20
50 %
45 seconds 67 seconds
45 seconds 23 seconds
680
50 %
45 seconds 23 seconds
45 seconds 67 seconds
7.30 >= 7.40
75 % 100 %
always
never
685 >= 690
25 % 0 %
never
always
p. 19