<4. OPERATION>
4-9
IM 12E04A02-02E
9th Edition : Mar. 16, 2018-00
4.2.3 Automatic Zero-calibration Operation
If the specifications including automatic zero calibration (Suffix code: -A3) are used, zero
calibration is automatically performed. The automatic zero-calibration computation is
implemented by passing zero water and at a stabilized indication after performing the same
cleaning operation as automatic cleaning in subsection 4.2.2 b.
In addition, at the start and end of automatic zero calibration, all starting and completing digital
information is output (see digital communication specifications in Section 2.1).
Automatic zero calibration can be started in the following two ways.
• Startup with the internal timer (see Figure 4.7).
• Startup with FUNCTION “7” in the <MAINT.> mode (see Section 6.5).
Note: Startup with the internal timer can be selected for execution (on)/stop (off) using FUNCTION “B.” in the <PROGRAM1> mode. It
has been set to execution (on) when shipped from the factory.
Figure 4.9 shows the automatic zero-calibration operation time chart.
For the setting, see Table 4.3.
<Valve used>
SV1: Drain valve
SV2: Cleaning-water valve
SV3: Measuring-water valve
SV4: “Zero-water” valve
<Time chart>
Example: N (number of cleaning repetitions) = 4
F0409.ai
*1: During cleaning, the output is always in the hold state.
The display is also set to be held using FUNCTION "8." in the
<PROGRAM1> mode.
Contact outputs C1 and C2 can be used as contacts for the period
during cleaning and calibration. This is set using FUNCTION "E."
in the <PROGRAM1> mode.
*2: N: Number of cleaning repetitions
*3: One automatic cleaning cycle = N (dr f cleaning)
+ 2 (dr f relaxation)
SV1
(Drain)
SV3
(Water sample)
SV4
(Zero water)
OFF
OFF
OFF
OFF
ON
ON
OFF
ON
N*2= 1
2
3
4
ON
HOLD ON
Calibration start
Cleaning time 2
One calibration cycle*3
Calculation for
zero calibration
Recovery
time
Drain time 2
Drain time 2
Water fill time 2
Water fill
time 2
Water fill time 2
Recovery time
SV2
(Cleaning)
Output
holding *1
ON
Figure 4.9 Automatic Zero-calibration Time Chart
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