User Guide
MES 1003 WMS
Doc no. 100837-MAN – Rev. E1 – Rev. date 2022-10
© Danfoss IXA A/S | Page 33
Cleaning the Turbidity sensor
Clean the sensor windows with a soft cloth and then wipe it with isopropanol.
Do not use any aggressive cleaning solutions, putty, sandpaper or cleaning solutions that contain abrasive substances to
remove dirt.
If precipitates such as carbonates or iron oxides appears, then use a handkerchief moisted in citric acid. Place it on the
windows for a few minutes and wipe with a soft cloth.
Cleaning the pH sensor
Do not disassemble the sensor for cleaning and maintenance.
The sensor should always be kept clean. If there is a biofilm on the sensors, this can lead to measurement errors.
A dirty sensor should be cleaned with buffer solution.
If possible, mechanical influences on the glass membrane should be avoided.
For stubborn soiling, a very soft brush or a soft sponge can be used carefully.
For more solid deposits, the sensor can be immersed in a diluted HCl solution or a base. Pepsin can also be used in
the case of organic deposits.
After cleaning, always rinse the sensor carefully with distilled water.
Avoid touching the sensors, as they could be damaged. If this is the case, the functionality of the sensor can no longer be
guaranteed.
Refit sensor, tighten the bolts with 0.39 Nm
5.2.4.
Salt bridge replacement – pH sensor
The average lifetime of the pH sensor is about 12 months. The sensors lifetime can be extended by replacing the
electrolyte and the salt bridge.
It is recommended to replace electrolyte and salt bridge once every 12 months. Follow these steps:
1.
Remove the salt bridge by carefully turning it counter-
clockwise with a spanner or pliers
