YOKOGAWA FC400G User Manual

< 8. Maintenance >
8-1
IM 12F5A1-01E
8. INSPECTIONANDMAINTENANCE
This chapter describes the inspection and maintenance required to maintain the FC400G
operation in good condition.
8.1 InspectionandMaintenanceItemsand
Implementation Cycle
The table below shows the principal inspection and maintenance items and recommended
maintenance intervals to maintain good operating condition.
Actual maintenance intervals must be determined in accordance with individual operating
conditions.
Table8.1 InspectionandMaintenanceItemsandImplementationCycle
Inspection and Maintenance Items Implementation Cycle
●Polishing of indicator electrode
●Replacementofindicatorelectrode
●Ceramicbeadscleaning
●Replacementofceramicbeads
●Measuringtankcleaning
●Calibration
●Replacementofactivatedcharcoallter
Monthly
Once a year
Every 3 months
Once a year
Every 3 months
Monthly
Once a year
Note: Appropriate maintenance intervals must be determined in accordance with the condition or contamination. Same applies (to
decreaseofinuenceof)combinedchlorineinsensitiveversionwithgoldalloyelectrodeandglassbeads.
8.1.1 PolishingtheIndicatorElectrode
Theindicatorelectrodeconstantlyrotatesat600rpm(at50Hz)andisautomaticallycontinuously
polishedwithceramicbeads.However,thisdoesnotcompletelypreventadhesionof
contamination; contamination gradually accumulates on the electrode surface over time.
A contaminated electrode surface is a cause of measurement error. The degree of this
measurement error increases depending on the amount of contamination. Therefore, the
electrode surface must be polished using abrasive (alumina) to remove such contamination
beforemeasurementerrorexceedstheallowance.
Polishingfrequencydi󰀨erswiththequalityofthesamplewater.Polishingeveryafewmonths
maybesu󰀩cientinsomecases.However,ingeneral,itisrecommendedthattheindicator
electrode be polished every month. For polishing procedure, follow
Sec.6.1.4, when the electrode
is polished, zero point and span must always be calibrated.
Whiletheindicatorelectroderotatesat600rpm(at50Hz),theelectrodeisautomaticallypolished
withceramicbeads.However,thisdoesnotcompletelypreventadhesionofcontamination;
contamination gradually accumulates on the electrode surface over time. Therefore, the
electrode surface must be polished manually with polishing powder (alumina) to remove
suchcontaminationbeforethemeasurementerrorexceedstheallowance.Forthepolishing
procedure,followSec.6.1.4.Inparticular,polishtheelectrodesurfaceasdescribedwhenithas
become corrugated or deformed from the original shape (circle with a diameter of about 3 mm).
Note: It is recommended to polish the indicator electrode every month. Every two or three months
maybesu󰀩cientinsomecases;therequiredpolishingfrequencydi󰀨erswiththequalityof
the sampling water. After polishing the electrode surface, conduct calibration with running-in
operation.
(1) Press the
MODE
key on the converter to enter the operation level and press the
YES
NO
key to select the <CELL> mode (cell motor ON / OFF). Press the
NO
key with
respect to the message “CELL ON” displayed to stop the rotation of the indicator electrode.
  Whentheelectrodestopsrotating,theCELLlampextinguishes.
Remove the electrode mechanism block from the measuring tank and set up the block as

YOKOGAWA FC400G Specifications

General

Brand	YOKOGAWA
Model	FC400G
Category	Measuring Instruments
Language	English