<6. Maintenance>
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IM 12A01F01-03EN 2nd Edition : Feb. 19, 2019-00
6. Maintenance
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FLXA402 periodic maintenance
The FLXA402 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 fitted when the unit is re-assembled in order to maintain the housing’s weatherproof
integrity against water and water vapor.
The pH measurement uses high impedance sensors and may otherwise be prone to problems
caused by exposure of the circuitry to condensation.
CAUTION
Never use harsh chemicals or solvents. If the window does become heavily stained or scratched,
parts replacement might be required. Contact Yokogawa service center.
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Battery
The FLXA402 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 off.
Although the cell has an expected working life of 10 years, this is not guaranteed. When this cell
needs replacing, contact your nearest Yokogawa service center.
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Periodic maintenance of sensors
Follow the manual of each sensor about the maintenance of the sensor.
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Predictive maintenance
The FLXA402 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 with predictive maintenance.
See the following manuals about “Wellness settings”.
Title
Document number
FLXA402 4-Wire Converter
Operation of pH/ORP
FLXA402 4-Wire Converter
Operation of SC
FLXA402 4-Wire Converter
Operation of ISC
FLXA402 4-Wire Converter
Operation of DO