<6. Maintenance, Trouble shooting>
6-1
IM 12A01G01-03EN 1st Edition : Mar. 25, 2021-00
6. Maintenance, Trouble shooting
6.1 Maintenance
n FLXA402T periodic maintenance
The FLXA402T requires very little periodic maintenance, except to make sure the front window
is kept clean in order to permit a clear view of the display and allow proper operation of the
touchscreen.
If the window becomes soiled, clean it using a soft damp cloth or soft tissue. To deal with more
stubborn stains, a neutral detergent may be used.
When you must open the front cover and/or glands, make sure that the seals are clean and
correctly tted when the unit is re-assembled. Avoid water or water vapor from the housing.
The pH measurement uses high impedance sensors with glass electrode. Prevent the inside of
the converter from water or water vapor.
CAUTION
Never use harsh chemicals or solvents. If the window does become heavily stained or scratched,
parts replacement might be required. Contact Yokogawa service.
l Battery
The FLXA402T has a logbook feature that uses a clock to provide the timings. The instrument
contains a lithium cell (battery) to continue the clock function while the power is turned o.
Although the cell has an expected working life of 10 years, this is not guaranteed. When this cell
needs replacing, contact Yokogawa service.
n Periodic maintenance of sensors
Follow the manual of each sensor about the maintenance of the sensor.
l Predictive maintenance
The FLXA402T has a unique function of wellness check.
Setup the sensor wellness check allows you to grasp the condition of the sensor in the gauge
display on Detail screen and enables you to have the predictive maintenance.
See the following manuals about “Wellness settings”.
Title Document number
FLXA402T Liquid Analyzer for Turbidity and Chlorine, Operation of pH IM 12A01G02-01EN
FLXA402T Liquid Analyzer for Turbidity and Chlorine, Operation of SC IM 12A01G03-01EN
CAUTION
When connection with sensors except for analog PH/SC sensor is disconnected, the measured
value will be held for 5 seconds until FLXA402T recognizes the sensor connection is down.
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