User Manual

<18. MAINTENANCE>

18-1

IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00

18. MAINTENANCE

n Periodic maintenance

TheFLXA21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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.Intheeventthatthewindowdoesbecomeheavily

stained or scratched, refer to the parts list for replacement part numbers.

l Battery

The FLXA21 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.

n Periodic maintenance of the sensor

Please follow the manual of each sensor about the maintenance of the sensor.

l Predictive maintenance

TheFLXA21hasauniquepredictionfunction(wellnesscheck).

Bymakingsettingsconcerningthesensorwellnesscheck,youcangraptheconditionofthe

sensorinthegaugedisplayintheDetailscreenandcarryoutpredictivemaintenance.

See section 4.2.7, 7.1.7, 10.1.7, 13.2.7, or 16.2.7, Sensor diag. settings.

ISC

SENCOM