ProMinent CTE 1-mA Instrucciones De Servicio página 37

Requirements The sensor reading is stable (no drifts or unsteady values for at least
5 minutes). 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 Zero point calibration is necessary only when the sensor is used at the lower
limit of the measuring range.
Slope
calibration
®
ProMinent
CAUTION
• Carry out a slope test every time the membrane or
electrolyte is changed.
• Avoid air-bubbles in the sample flow. They can attach at
the membrane, which may cause too low measured values.
Within a control system this may lead to dangerous over-
dosing of bromine.
• For proper function of the sensor, the slope test has to be
repeated regularly.
• If installing the sensor outside Germany, please comply
with the local regulations for calibration intervals.
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)
Dip the sensor into a container with clean water without any oxidants.
Stir by using the sensor, until the measured value remains stable.
Adjust the controller (DULCOMETER
to it's operating instructions (DULCOMETER
Instructions: Chapter 8, complete operating menu, settings menu
"Calibrating chlorine 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 information, Chapter 15).
®
D1C, chlorine) to zero, according
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D1C, chlorine Operating
Operation
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