YOKOGAWA RC400G, User Manual

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<5. Converter Operation>
5-29
IM 12F4A1-01E
(13) Selection of Automatic Zero Calibration Function “execution/
stop” (Function code “5.”)
Whether automatic zero calibration is performed or not can be selected. The setting procedure is
shown below.
(a) Select function code “5.”
(b) Each time [>] key is pressed, on and oFF are alternately displayed.
(c) Select on (execution) or oFF (stop).
(d) Press [ENT] key to enter it.
The automatic zero calibration mode set in this code will be valid soon after the setting.
• When the automatic zero calibration mode is set to “execution,” a zero flushing function,
which allows chlorine-free water to pass once every 24 hours under the following conditions,
*1 and *2, is enabled (during the zero flushing, the indication is held). This function is
provided to prevent corrosion of the activated charcoal filter.
*1: The automatic zero calibration function is enabled.
*2: The automatic zero calibration cycle is longer than one day. (Refer to subsection 7.2.2)
(14) Selection of Cleaning Sequence to be used (Function code “8.”)
One sand filter is used for the RC400G-2 residual chlorine analyzer for raw water, and two sand
filters are used for the RC400G-3 residual chlorine analyzer for treated water.
Hence, sand filter cylinder cleaning is performed in different cleaning sequences for the
RC400G-2 and for the RC400G-3 (see subsection 5.3.5).
In this function code, the relevant cleaning sequence must be entered for either one cylinder or
two cylinders depending on the specifications for the analyzer used. However, since it is already
entered on shipment, it is usually unnecessary to specifically conduct it.
If entry is necessary, perform key operation in the following procedure:
(a) Select function code "8.". → _ _ 1
(One cylinder)
_ _ 2
(Two cylinders)
(b) Every time [>] key is pressed, _ _ 1 and _ _ 2 are
alternately displayed. → _ _ 1 ↔ _ _ 2
(c) Select _ _ 1 (one cylinder type) or _ _ 2 (two cylinders type).
→ _ _ 2
(d) Press [ENT] key to enter it. → _ _ 2
(Flashes once.)
When transferred to <MEAS.> mode, a cleaning sequence relevant to the one entered here is
activated.
However, if the sand filter cylinder cleaning function is set to “oFF (stop)” with function code “A”,
the cleaning sequence is not activated.
(15) Selection of Measuring Tank Cleaning Function “execution/stop”
(Function code “9.”)
For the RC400G-2 (raw water) or the RC400G-3 (treated water) residual chlorine analyzer,
automatic cleaning of the measuring tank and sand filter cylinder(s) using cleaning water can be
executed based on the set sequences.
In this function code, measuring tank cleaning “execution/stop” should be set. For residual
chlorine analyzers of the relevant specifications, cleaning execution is set on shipment. Thus,
since cleaning is normally executed, it is unnecessary to specifically reset it.
14th Edition : Jul. 15, 2020