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4.3.7 Sensor Calibration
The UV-C sensor is calibrated at the factory and does not need recalibration.
4.3.8 Setting Trend Display Range
The recording time of the sensor signal for the trend display can be adjusted. The value (in days)
is interpreted as a time window and therefore guarantees a continuous display: After the selected
time has elapsed, the oldest value is deleted and the new value displayed.
Presetting 100 days
4.3.9 Setting Safety Threshold
Reliable water treatment is no longer ensured if the UV-C output decreases to such an extent
that the sensor signal drops below the safety threshold. In this case, the shut-off valve, if fitted,
is closed. This situation is indicated by two flashing arrows on the display.
A signalling device can be connected to the SAFETY THRESHOLD signalling relay of the control.
The relay is closed when the safety threshold is undershot.
WARNING!
After changing a UV lamp, check the safety and warning threshold and readjust if
necessary!
Adequate disinfection is ensured only when the safety threshold is set correctly.
IMPORTANT!
The safety threshold must be below the warning threshold. It is not possible to set this
threshold outside the warning threshold.
Observe the supplementary instructions for special applications, in which the sensor signal
is displayed in %!
➤ Switch on the system with the Start/Stop key
➤ Wait until the UV lamps develop their full power output, i.e. the UV-C sensor signal is stable
➤ Read off the indicated UV-C intensity and note down
➤ Switch off the system with the Start/Stop key
➤ Set the safety threshold to 50 % of the read-off UV-C intensity
Example: Read UV-C intensity: 100 W/m
2
Therefore: Safety threshold = 100 W/m
2
0.50 = 50.0 W/m
2
➤ Now set the warning threshold (see Section 4.3.10 “Setting Warning Threshold”).
Control
100 W/m
2
Cal. factor =
1.000
Time 5:00
Display range
Trend display
100 day(s)
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