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<4. OPERATION>
4-5
IM 12E04A02-02E
9th Edition : Mar. 16, 2018-00
4.2.2 Automatic Cleaning Operation
When automatic cleaning is specified (Suffix code: -A2 or -A3), the detector is automatically
cleaned in the <MEAS.> mode. With measuring water (or zero water) flowing, dirty substances
on the measuring cell wall and the measuring surface edge are washed out by jets of cleaning
water (tap water) from two outlets on the side of the measuring cell in the detector. After cleaning,
dirt on the measuring cell, header tank, and in the piping between the header tank and the
detector is washed out by opening the drain outlet of the header tank.
The above cleaning operation is repeated a predetermined number of times.
The information of start or end is output when automatic cleaning is started or ended.
In addition, there are two types depending on the specifications for automatic cleaning.
•
Without automatic zero calibration (Suffix code: -A2)
•
With automatic zero calibration (Suffix code: -A3)
The explanation for each types are followed.
a. Without Automatic Zero Calibration (Suffix code: -A2)
Automatic cleaning can be started in the following two ways:
• Startup with the internal timer
• Startup with FUNCTION “6” in the <MAINT.> mode (see Section 6.5).
Note: Startup with the internal timer can be selected for execution (on)/stop (off) using FUNCTION “A.” in the <PROGRAM1> mode. It
has been set to execute (on) when shipped from the factory.
The internal timer operation is shown below. The automatic-cleaning operation is repeated at
every preset time of the cleaning period (A) (Figure 4.5).
A
A
A
A
A
Cleaning
Cleaning
Cleaning
Cleaning
Cleaning
Cleaning
A
Measurement start *1
*1: Measurement start is defined to be the point specified in the following:
Other mode
<MEAS.> mode
Power off
Power on (<MEAS.> mode)
F0405.ai
Figure 4.5 Cleaning Period
Figure 4.6 shows the automatic-cleaning operation time chart and Table 4.2 the list of settings for
automatic cleaning.
<Valve used>
SV1: Drain valve
SV2: Cleaning water valve
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