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<7. Calibration>
7-2
IM 12F4A1-01E
(4) Re-mount the electrode mechanism block to the measuring tank.
Also, press [CELL] key to rotate the indicator electrode.
7.2.2
Zero Calibration Using Chlorine-Free Water
Conduct zero calibration using the chlorine-free water in the following procedure: Mount the
electrode mechanism block to the measuring tank and turn the indicator electrode in advance.
(1) Prepare chlorine-free water of approx. 2 to 3 liter produced by passing sample water
through activated charcoal filter in a suitable vessel.
Also prepare a tube (O.D. 6 mm x I.D. 4 mm) for supplying this chlorine-water to the residual
chlorine analyzer.
(2) Set the vessel containing chlorine-free water so that the water level satisfies the conditions
shown in Figure 7.1.
Chlorine-free water
35 cm or less
50 cm
Maximum level
Reagent metering pump
center position
Residual chlorine analyzer
installation surface
F7.1.ai
Figure 7.1
Chlorine-Free Water Level
(3) Connect one end of the tube for supplying chlorine-free water to the residual chlorine
analyzer standard solution tubing connecting port (Rc1/4 screw). Immerse the opposite end
of the tube in chlorine-free water.
(4) Transfer the “sample water/standard solution” selector valve to the “standard solution”
position and feed the detector with chlorine-free water.
The measured value normally stabilizes in approx. 5 to 10 min.
(5) Confirm that the mode is <MAINT.> and set the function code to “1”.
The content of this code is “zero calibration”.
(6) Start calibrating operation. Press [ENT] key.
During calibrating operation, <CAL> lamp flashes. Calibration is performed when the
analyzer stabilizes to that predetermined conditions are met after measured value stability is
automatically checked.
When calibration is executed, the value displayed in the data display flashes once and, at
the same time, flashing <CAL> lamp extinguishes.
After calibration, pass chlorine-free water for short period of time and confirm that indication
holds the value of 0 ppm stably.
(7) Now the zero calibration is completed.
Leave the tube for supplying chlorine-free water as connected and subsequently conduct
span calibration.
14th Edition : Jul. 15, 2020
Содержание RC400G
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