YOKOGAWA FC400G

< 8. Maintenance >
8-4
IM 12F5A1-01E
8.1.4 ReplacementofActivatedCharcoalFilter
(1) CloseBV1andBV2,thenrotateltercasetoremove(seeFigure8.4).
(2) Clean inside of case with brush or the like.
(3) AsillustratedinFigure,replacelterwithnewone.
(4) Reassemble using the reverse procedure, then open BV3 and BV1 to pass water through
lter.  Checkthattherearenowaterleaksfromlterandpiping,andno
bubbles in drain water.
(5) Operateforabout20min.thenconrmthatfreeavailablechlorineanalyzerreadingisnear
zero.
(6) CloseBV3andopenBV2ballvalve.
Lid
(held in place by piping)
Spacer
Filter (activated charcoal)
Filter case
Turn
Figure8.4  ReplacingActivatedCharcoalFilter
8.2 CheckingtheElectrodeMechanismBlock,
and Replacing Damaged Parts
Detectorelectrodepartssuchasthemotorassemblyanddrivenshaftassemblyhavenitelife.
Ifconditionsofuseorenvironmentareoutsideofspecications,theirlifemaybeshorterthan
wouldotherwisebeexpected.
Periodically check whether electrode mechanism block is operating normally. To check if
abnormal or not, refer to “Main Check List”; for a simple check whether calibration and the like is
abnormal,referto“AuxiliaryCheckList”.Alternatethesechecksforbestresults.
Whensuchpartsthataresubjecttoaginghavebeenoperatedfortheir“recommendedlifetime”,
it is recommended that you replace them even if you feel that there is still life left in them.
Table8.2showsalistofpartsthatwerecommendyoutoperiodicallycheckandreplace.
Table8.2 Partsrecommendedforperiodicchecksandreplacement
Part Recommended check
interval
Recommended
replacement interval
Rotating contact �* 1 year operation
Drive belt 6months(sub;3months.) 3 years operation
Driven shaft assembly 6months(sub;3months.) 3 years operation
Motor Assembly / gear head 6months(sub;3months.) 3 years operation
*: Rotating contact does not require inspection.