ProMinent DULCOTROL, Общие инструкции по эксплуатации

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Pr o Minent
®
Page 110
Calibration of the Chlorine Sensor (Continuation)
The calibration (slope calibration) of the chlorine sensor uses the DPD method. When starting
cali bra tion, the frozen measuring value is proposed; this value may be adjusted to the meas-
ured DPD value using the Up and Down buttons. A calibration will only be possible if the
DPD value is
≥ 2% of the measuring range. During calibration, control function and metering are
maintained. After successful calibration, all fault determinations relating to the measuring value
are started again.
With a measuring range adjusted to 0 - 0.5 ppm, the zero point may be calibrated in the entire
operating menu in addition to the slope. The zero point calibration should be performed under
realistic condition with chlorine-free water. In this case, control will be stopped and metering will
be reduced to the set base load.
The output 0/4...20 mA (measuring value) will be frozen.
IMPORTANT
The measuring range of the chlorine sensor must correspond to the adjusted measuring
range of the DULCOMETER ® D2C (factory setting 0 - 2.00 ppm). A possible alteration of the
measuring range must be done prior to calibration. If the measuring range is altered, all
settings are reset to the factory settings.
pH/Chlorine
Possible values
Initial value Increment Lower value Upper value Remarks
DPD-value Measured value 0.01 ppm 0 ppm 20 ppm
Zero point Measured value – – –
(mA)
Error message Condition Remarks
Calibration Cl not possible! Cl slope too low Repeat calibration
Sensor slope too low (<25% of standard slope)
Calibration Cl not possible! Cl slope too high Repeat calibration
Sensor slope too high (>300% of standard slope)
DPD value too low! DPD <2 % of measuring range Repeat calibration after
DPD > x.xx ppm addition of chlorine
Zero point too high Sensor signal >5 mA Repeat calibration in
chlorine-free water
Zero point too low Sensor signal <3 mA Check sensor connection
replace sensor, if necessary
calibration
end?
calibration Cl
2
zero p.: 4.00 mA
slope:
6.00 mA/ppm
only with measuring
range 0,5 ppm
calibration Cl
2
zero p.: 4.00 mA
slope:
6 mA/ppm
calibration Cl
2
zero point:
0.45 ppm
calibration Cl
2
zero point
value take over?
4.01 mA
calibration Cl
2
DPD-value
0.45 ppm
calibration Cl
2
DPD-value:
0.45 ppm
D2C2-pH-CI-T3-D
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