Yokogawa 2-Wire Dual Channel Transmitter/Analyzer FLXA21 Manual de usuario Pagina 208

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<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.
PH
SC
ISC
DO
SENCOM
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