ProMinent DULCOTEST CLT 1 Mode D'emploi page 37

Requirements The sensor reading is stable (no drifts or unsteady values for at least 5 min.).
This is normally fulfilled, when
• The system has been allowed to run-in for the specified period (see Run-in
• The flow through the in-line probe housing is constant and corresponds
• The sample medium and the sensor are at the same temperature
• The pH value is constant and within the admissible range (pH 6.5 - 9.5).
Zero point
calibration A zero point calibration relating to the DULCOMETER
necessary if the measuring cell is used at the lower limit of the measuring
range.
Slope
calibration
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ProMinent
period, Chapter 8.1)
with the Technical data in Chapter 14
Remove the sensor from the DLG III or DGM in-line probe housing (see DLG
III, DGM operating instructions)
Immerse the measuring cell in a container filled with clean water, free from
chlorine and oxidising agents (Fe
Stir by using the sensor, until the measured value remains stable.
Adjust the controller (DULCOMETER
it's operating instructions manual (DULCOMETER
Instructions: Chapter 8, complete operating menu, settings menu "Cali-
brating Clt zero point")
Reinstall the sensor into the in-line-probe-housing (DGM, DLG III) according
to Chapter 7.
Insert the sensor into the DLG III or DGM in-line probe housing, if not
already done (see Assembly, Chapter 6).
Take a water sample for DPD-measurement. Sampling location has to be
close to the installed sensor. Recommendation: use the sampling tap in the
case of the DGM in-line probe housing (see Figure 2 and Ordering infor-
mation, Chapter 15).
Determine the chlorite content with a suitable DPD-Method ( e.g. DPD).
Input the measured value into the controller according to it's operating
manual (DULCOMETER
complete operating menu, settings menu "Calibrating Clt".
After initial installation of the sensor, check the calibration by DPD-
measurement 24 hours later.
recommended frequency of calibration: weekly
2+ 2+
, Mn , nitrite, ...).
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D1C, Chlorite) to zero, according to
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D1C, Chlorite Operating Instructions: Chapter 8,
Operation
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D1C Chlorite is only
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D1C, Chlorite Operating
37