ProMinent DULCOTROL, Общие инструкции по эксплуатации

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Pr o Minent
®
Page 51
Permanent display 1
calibration H2O2
zero p.: 4.00 mA
slope
60.0 μ A/ppm
calibration H2O2
zero p.: 4.00 mA
slope
60.0 μ A/ppm
calibration H2O2
H2O2-value:
155 ppm
D1C2-H2O2-012-GB
Permanent display 1
Permanent display 2
only with control
(w = setpoint) Positive values of setting variable: H
2
O
2
Negative values of setting variable: De-H
2
O
2
(H
2
O
2
destruction)
mea. val. 2000 ppm
feedfwd: 70 %
ctrlout: 59 %
w: 100.0 ppm
ppm
2000
D1C2-H2O2-011-GB
H
2
O
2
Preconditions Operation of the sensor is stable (no possible drift or fl uctua ting measured values during a
minimum period of 5 minutes). This is generally guaranteed when the following conditions are
fulfi lled:
• the H
2
O
2
concentration of the sample water is isochronically suffi ciently constant (please note
the sensor’s response time of 8 min!)
• the relevant running-in time has been allowed
• permitted fl ow is present in the in-line probe housing
• Temperature compensation is given between sensor and sample water (wait approx.
15 minutes).
Zero Point Calibration
A zero point calibration is only required at the lower limit of the measuring range.
Slope Test
IMPORTANT
• After an initial commissioning, check calibration after 24 hours.
• Repeat calibration if the H
2
O
2
concentration varies by more than 15 % from the
reference value.
On Photometry
If not yet installed, install the sensor into the in-line probe DLG III or DGM.
Perform sampling. This must be performed in direct proximity to the sensor. Recommendation:
in case of the in-line probe DGM use the sampling valve.
Determine the H
2
O
2
concentration as quickly as possible with a Photometer (please observe
operating instructions! E.g. use the Photometer DULCOTEST
®
DT3).
Set the determined H
2
O
2
concentration in ppm at the control device according to its operating
instructions (see operating instructions DULCOMETER ® D1C, measured variable H
2
O
2
,
Chap. 8, Complete operating menu, Setting menu “Calibrate H
2
O
2
”).
Calibration of the H
2
O
2
Sensor
During calibration, the D1C sets the positioning outputs to “0”. The exception to this is that when
a base load or a manual controller output has been set, these are retained during the calibration.
The mA standard output signals (measured value or correcting value) are frozen. The measured
value frozen at the start of the calibration is suggested as the H
2
O
2
value; this value is adjustable
(arrow keys!). Calibration is only possible when the H
2
O
2
value ≥ 2 % of the range. When the
calibration is successfully completed, all fault diagnoses that relate to the measured value are
started afresh.
IMPORTANT
The measuring range of the sensor must agree with the set measuring range (factory
setting: 0–200.0 ppm). The measuring range must be reset prior to calibration.
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