YOKOGAWA RC400G, User Manual

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<1. Outline>
1-2
IM 12F4A1-01E
1.1 RC400G Residual Chlorine Analyzer
Configuration
The RC400G Residual Chlorine Analyzer is mainly composed of a “measuring system”, a
“sampling system” and an “air tubing system”.
In addition, a “cleaning piping system” is added to raw water treated water analyzers.
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Measuring System
“Measuring System” mainly consists of a detector and a converter.
The detector contains a measuring tank and an electrode mechanism block. The electrode
mechanism block incorporates two electrodes, indicator electrode (gold alloy electrode) and
counter electrode (platinum electrode with built-in Pt1000 temperature sensor), and a drive
assembly composed of a starting motor for rotating the indicator electrode at a constant speed, a
drive belt, etc.
The electrodes obtain diffusion currents by electrolytic reduction of iodine (for measuring total
residual chlorine) or bromine (for measuring free available chlorine) in the plateau region, which
is liberated corresponding to sample water chlorine concentration in mixed solution of sample
water with reagent fed into the measuring tank. The electrodes also serve to obtain a signal for
automatic temperature compensation of the diffusion current which varies with temperature.
The measuring tank is made of acrylic resin, and the place of indicator electrode insertion houses
the glass beads for polishing the electrode.
The measuring circuit part of the converter is housed in a sealed case of aluminium alloy together
with an operating panel and an external cable connecting the terminal board.
The measuring circuit part serves to amplify and carry out computation based on the input
(diffusion current and temperature compensating signal) from the detector, and to obtain output
signals of 1 to 5 V DC or 4 to 20 mA DC, corresponding to the output range.
MEAS
MABT
PROGRAM 1
PROGRAM 2
5
SV1 SV2 SV3 SV4 SV5 SV6
ppm
MODE
DATASET ,
.
,
MANUAL OPERATION
SY1 SY2 SY3 SY4 SY5 SY6
+ -
R1
R2
11 12 O1 O2 F1 F2 M1 M2 L2 L1
U1 U2 U3 U4
T1 T2 G
G
C1 C2 V1 V2 V3 V4 J1 J2 A1 A2
Drive assembly
Counter
electrode
Measuring tank
Glass beads
Indicator electrode
Operating panel
External cable
connecting
terminal
F1.3.ai
Figure 1.2 Detector Figure 1.3 Converter
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Sampling System
“Sampling System” consists primarily of sample water tubing and reagent tubing.
The system conditions the sample water and reagent fed to the measuring tank in the detector to
a specified flow rate.
The sample tubing incorporates a ball valve, a head tank (for tap water) or a sand filter (for raw or
treated water), and a metering pump.
14th Edition : Jul. 15, 2020