Liquisys M CCM223/253 Maintenance
Endress+Hauser 97
Air bubbles in the electrode:
• Air bubbles can indicate incorrect mounting. For this reason check the orientation.
• The range 15° to 165° to the horizontal is allowed (ISFET sensors are the exception).
• Not permitted: horizontal installation or installation with the plug-in head pointing
downwards.
A0027183
44 Permitted angle of installation for glass electrodes
Check for reference system reduction
The inner reference lead of the reference system (Ag/AgCl) of a combination electrode or
a separate reference electrode is usually brownish and matt. A silver-colored reference
system is reduced and therefore defective. This is caused by a current flowing through the
reference element.
Possible causes for the current flow:
• Incorrect measuring device operating mode selected (PML pin connected, but operating
mode asymmetrical ("without PML"). See also the function description for "Selecting the
connection type".
• Shunt in measuring cable (e.g. due to moisture) between reference line and grounded
shield or PM line.
• Measuring device defective (shunt in reference input or entire input amplifier
downstream of PE).
9.1.3 Maintenance of chlorine sensors
Please refer to the Operating Instructions for your sensor for sensor maintenance and
troubleshooting:
CCS120 BA00388C/07/EN
CCS140/141 BA00058C/07/EN
CCS240/241 BA00114C/07/EN
963 BA00039C/07/EN
The Operating Instructions contain detailed information including:
• Sensor design and function
• Mounting and installation
• Electrical connection
• Commissioning and calibration
• Calculation examples and tables for verification of measured values
• Maintenance, regeneration, cleaning
• Troubleshooting table
• Accessories and spare parts
• Technical data and ordering information
9.1.4 Assembly
Refer to the assembly operating manual for information on servicing and troubleshooting
the assembly. The assembly operating manual describes the procedure for mounting and
disassembling the assembly, replacing the sensors and seals, and contains information on
the material resistance properties, as well as on spare parts and accessories.
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