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<7. MAINTENANCE>
7-1
IM 12E04A02-02E
9th Edition : Mar. 16, 2018-00
7. MAINTENANCE
This chapter describes the inspection and maintenance implemented to maintain the instrument
in good operating condition.
7.1 Inspection and Maintenance Intervals
Table 7.1 shows the main inspection and maintenance items to keep the instrument in good
operating condition and their recommended periods before inspection or maintenance. As these
periods vary with each operating condition, use Table 7.1 only as a guide.
Table 7.1 Guide for Inspection and Maintenance Periods
Inspection or maintenance item
Recommended Interval
Washing with cleaning water
As needed
Cleaning of measuring cell
Weekly
Cleaning of head tank
Monthly
Lamp replacement
Yearly
Zero calibration
Monthly
Span calibration
Monthly
Cleaning of lenses
6 months
Replacement of zero turbidity filter element
Yearly*1
Fuse replacement
Yearly
Cleaning of piping
6 months
Checking of flowrate and water level
Monthly
Silicone tube (for Suffix Code "-A2" or "-A3")
Yearly
*1:
This is a guide for the replacement period if the meter is operated at a flow rate of 2 L/min using tap water having an average
turbidity of 0.4 mg/L.
7.2 Washing with Cleaning Water
For the specification without automatic cleaning (Suffix code: -A1), washing is carried out by
opening and closing the values manually.
For the specification with automatic cleaning (Suffix code: -A2 or -A3), automatic cleaning
(washing) is performed periodically.
For the automatic cleaning operation, see Subsection 4.2.2.
Here washing of the instrument with the specification without automatic cleaning (Suffix code:
-A1) is described.
In this case, washing is carried out by manually operating valve V4 for cleaning.
(1) Select the <MAINT.> mode.
(2) Open valve V4 and wash for about 30 seconds (for the statuses of each valve during
washing, see Table 6.15).
In order to prevent cleaning water from splashing, wash by passing measuring water or
"zero water" through the valve.
(3) Close valve V4 and open valve V5 for about 19 seconds to drain water.
(4) Repeat steps 2 and 3 several times depending on the degree of contamination.
(5) Close valve V5.
(6) Finished.
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