YOKOGAWA RC400G, User Manual

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<10. Spare Parts and Consumables>
10-2
IM 12F4A1-01E
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Complementary Description
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Reagent
The reagent for free available chlorine measurement is prepared by acetic acid, sodium acetate
and potassium bromide. For making 100 liter of this reagent, 1000 mL of acetic acid, 1 kg of
sodium acetate and 4 kg of potassium bromide are required.
Reagent of 100 liter is approx. 45 days’ supply. Therefore, for one-year supply, a quantity of 8
times the above is required.
The reagent for total residual chlorine measurement is prepared by acetic acid, anhydrous
sodium acetate and potassium iodide.
Quantities of each component vary with the measurement range. Refer to subsection 2.1.
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Lubricating oil (K9041RA)
To maintain smooth operation of the metering pump drive assembly levers, use this lubricating oil
on each bearing of the four lever support blocks once a month or so. One bottle of lubricating oil
is supplied as an accessory. It can be used for some time as its use requires only about 0.4 ml at
one time.
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Polishing Powder (K9088PE)
This is used to remove contamination on the indicator electrode, as contamination cannot be
prevented completely by automatic polishing with glass beads,
One bottle of the agent is supplied as an accessory.
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Glass Beads (K9332ZJ)
These are for replenishing or replacing the glass beads used for automatic polishing of the
indicator electrode, as beads are gradually lost or become so contaminated they cannot be
cleanable.
The quantity required for replenishment and replacement depends on the operating conditions; in
general, one to two packs per year.
Two packs of glass beads are supplied as the accessory.
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Sand (K9720FZ)
This is a spare part required for raw water type and treated water type analyzers, and used in the
following situations.
(1) When sand in the sand filter has decreased.
Flocks, etc. depositing in the sand filter are flushed and discharged from the sand filter
by automatic water jet at regular intervals. If the frequency of the automatic cleaning is
improper, sand can be discharged with the flocks, and sand in the sand filter decreases. As
the sand filter must retain sand to a certain level, making-up for sand decrease is required.
(2) When the entire sand in the sand filter has discolored.
Although manganese and iron contained in sample water are contaminants of the
electrodes, sand adsorbs most of the metals in the sample water, minimizing the
contamination of the electrodes.
When the sand has adsorbed a quantity of metals such as to discolor the entire sand layer,
the sand loses adsorption power and needs to be freshly replaced.
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Valve Sheet (K9041HC)
It is recommended to replace the valve sheets on the suction and delivery sides of sample water
and reagent metering pumps after use for six months to prevent possible trouble even if the
sheets still show no defect.
Determine the quantity of spare valve sheets taking this scheduled replacement into account.
14th Edition : Jul. 15, 2020