26 D01-060en202008 Manual nanoFlu
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Malfunction & Maintenance // nanoFlu
6.2.1 Checking the Zero Value
Prepare the sensor for the zero-value check as described in chapter 6.1 Cleaning and Upkeep.
To check and determine the zero value, we recommend to use glass vessels because they do not contain or
emit any uorescent substances that would interfere with a zero value measurement.
Alternatively, another container suitable for immersion can be used. When taking a measurement, the measur-
ing window must always be completely immersed in the water.
The zero value of the nanoFlu is checked via the web interface. To access the web interface, you will need the
G2 interface box and an Ethernet-capable device with a web browser, such as a notebook / laptop.
Carry out the zero-value determination at an ambient temperature of 20 °C, if at all possible. The temperature
of the ultra-pure water should also be 20 °C.
General Information:
• Do not touch the part of the sensor which has been submerged in the ultra-pure water with your hands
during the sensor check unless you are wearing gloves.
• Be sure to use highly pure water (ultra pure, resistance of 18.2 MΩcm) or distilled water.
• If impurities in the water show up during the check, the process must be started over!
• Make sure there are no air bubbles in front of the measuring windows. Even very small air bubbles in front
of the measuring windows can cause a transmission of 97 % or less.
6.2 Maintenance and Inspection
We recommend carrying out at least ve individual measurements in “Measurement” prior to the check, to bring
the sensor up to operating temperature.
Avoid touching the measuring window, since it can become scratched or dirty.
This means the functionality of the device can no longer be guaranteed.
NOTICE
Damage caused by improper cleaning is not covered by the guarantee!
NOTICE
After replacing the measuring windows, carry out a new zero-value measurement.
NOTICE
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