<7. MAINTENANCE>
7-6
IM 12E04A02-02E
9th Edition : Mar. 16, 2018-00
7.6 Zero Calibration
7.6.1 Zero Calibration with "Zero Water"
Zero calibration using "zero water" is described in this subsection.
(1) For specification with automatic cleaning and automatic zero
calibration (Suffix code: -A3).
Carry out zero calibration using the manual start function of automatic zero calibration.
(1) Select FUNCTION "7" in the <MAINT.> mode.
=> "A.CAL" is displayed.
(2) Press the [ENT] key.
=> Automatic zero calibration starts
and the "CAL" lamp flashes.
(3) Predetermined calibration operations are performed and terminated.
(2) For specification with automatic cleaning but without automatic zero
calibration (Suffix code: -A2).
Carry out zero calibration by allowing "zero water" to flow for about 30 minutes after performing
cleaning with the manual start function of the automatic cleaning.
(1) Select FUNCTION "6" in the <MAINT.> mode.
=> "JEt" is displayed.
(2) Press the [ENT] key.
=> Automatic cleaning starts.
(3) After cleaning is completed, allow "zero water" to flow for about 30 minutes to run-in the
filter. (For valve statuses, see Table 6.15).
(4) Select FUNCTION "1" in the <MAINT.> mode.
=> "Turbidity valve" is displayed.
(5) Wait until the reading becomes stable and then press the [ENT], [>], and [ENT] keys in this
order to calibrate the meter.
(6) Finished.
(3) For specification without automatic cleaning or automatic zero
calibration (Suffix code: -A1).
After performing manual cleaning, allow "zero water" to flow for about 30 minutes to perform zero
calibration.
(1) Select the <MAINT.> mode and open the valves so they are set to drain (for valve statuses,
see Table 6.15).
(2) After draining off the measuring water, allow "zero water" to flow (for valve statuses, see
Table 6.15).
(3) Open valve V4 with "zero water" flowing and let cleaning water flow for about 30 seconds.
(4) Close valve V4 and open valve V5 to drain off the water.
(5) Close valve V5 after about 10 seconds.
(6) Repeat operation steps 3 to 5 several times depending on the degree of contamination.
(7) Let "zero water" flow for about 30 minutes to run-in the filter.
(8) Select FUNCTION "1" in the <MAINT.> mode.
(9) "Turbidity valve" is displayed.
(10) Wait until the reading becomes stable and then press the [ENT], [>], and [ENT] keys in this
order to calibrate the meter.
(11) Finished.
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