triOS TpH - Malfunction and Maintenance; Cleaning and Upkeep

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D01-068en201913 Manual TpH
Malfunction and Maintenance // TpH
Use
Use
Calibration
Calibration
Malfunction &
Maintenance
Malfunction &
Maintenance
Commissioning
Commissioning
Introduction
Introduction
General
Information
General
Information
FAQ
FAQ Technical Data
Technical Data
Warranty
Warranty
Customer
Service
Customer
Service
Contact
Contact
Keyword Index
Keyword Index
Accessories
Accessories
6 Malfunction and Maintenance
6.1 Cleaning and Upkeep
The sensor requires only minimal maintenance. In applications which cause heavy soiling of the sensor, the sensor should be
serviced more often.
• The sensor should always be kept clean. If there is a biolm on the sensors, this can lead to measurement
errors.
• A dirty sensor should be cleaned with buer solution.
• If possible, mechanical inuences 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.
If the sensor is taken out of operation, it should be cleaned before being stored. The protective cap must be lled with
a 3-molar KCl solution.
6.2 Maintenance and Inspection
The average lifetime of a TpH sensor is about 1 year. If diculties occur during calibration, the sensor probably has to be
replaced.
Do not disassemble the sensor for cleaning and maintenance.
Avoid touching the sensors, as they could be damaged. If this is the case, the functionality of the
sensor can no longer be guaranteed.
After cleaning, always rinse the sensor and the sensor system carefully with distilled water.
NOTICE
NOTICE
NOTICE
6.2.1 Temperature calibration
Since the pH value is temperature-dependent, it is recommended to check the temperature with a reference thermometer
before the rst pH calibration. If the temperature measured by the sensor deviates more than 1°C from the one measured by
the reference thermometer, a calibration of the temperature oset is necessary.
1. If you need calibrate the temperature sensor, set the controller to Maintenance mode: “Options”  “Service mode”
2. Select the TpH sensor under “Sensor” and the corresponding port (COM port).
3. Press the “Calibrate” button and select the temperature.
4. The following calibration wizard will guide you through the next steps:
• Enter the measured temperature (reference thermometer) as the setpoint and press “Next”
• Then initiate a measurement by pressing “Measurement”
• Wait until “Continue” is active and then press it.
5. At the end you will be asked if you want to save the calibration. By pressing “Next”, the new calibration is saved in
the sensor; “Cancel” restores the previous calibration.