YOKOGAWA RC400G User manual

User’s
Manual Model RC400G
Residual Chlorine Analyzer
[Style: S4]
IM 12F4A1-01E
IM 12F4A1-01E
14th Edition

i
IM 12F4A1-01E
Introduction
The RC400G Residual Chlorine Analyzer is a process analyzer for continuous measurement of
free chlorine concentration and residual chlorine contained in chlorine-treated water.
l ConrmationofSpecications
The RC400G comprises Tap Water type (RC400G-1), Raw Water type (RC400G-2) and Treated
Water type (RC400G-3).
When the RC400G has been delivered to your location, carefully unpack and check the
equipment for any transportation damage, and ensure that the equipment is of the correct

package tag referring to Chapter 2 of this manual.
NOTE
• Unpack the equipment at a location close to its installation site.
• Locate on power to read to version number of ROM loaded on the equipment. Then,
follow the procedures as instructed in item (10) of subsection 5.3.3 after completion of the
installation work, such as wiring.
l CautionforTransferandStorage
Observe the following notices so as not to damage the RC400G on transfer and storage.
• When transferring the RC400G to its installation site or elsewhere, prevent the equipment
from receiving strong impact, and exercise care to minimize the vibration received.
CAUTION
Carry the RC400G in the same attitude as it will be installed. the RC400G weight exceeds 60 kg.
(For details, see subsection 2.1.1.)
• For storing the RC400G, select a place where the ambient temperature is in the range of
from -30 to 70 °C. Humidity must be of a level that does not result in dew condensation.
Exposure to corrosive gases or water splash must be avoided as well.
l ContentofUser’sManual
This user’s manual fully describes the handling of the RC400G, including installation, wiring,
operation, inspection/maintenance and so forth.

RC400G Residual Chlorine Analyzer.
To achieve full performance of this equipment, the user id recommended to peruse this manual
before handling the equipment.
This manual also introduces various peripheral equipment prepared by Yokogawa such as the
RC401G Reagent Tank which is used in combination with the RC400G analyzer.
Note: This manual does not describe any equipment or attachments that are supplied on special order.
NOTE
If this manual is used during the planning stage in advance of equipment order placement,
please be note that the content of this manual is subject to change without prior notice for product
improvement or other reasons.
When the manual is revised, the edition number or version number in the cover of the manual
changes.
14th Edition : Jul. 15, 2020
Media No. IM 12F4A1-01E 14th Edition : July 2020 (YK)
All Rights Reserved Copyright © 1992, Yokogawa Electric Corporation

ii
IM 12F4A1-01E
SafetyPrecautions
n Safety,Protection,andModicationoftheProduct
• In order to protect the system controlled by the product and the product itself and ensure
safe operation, observe the safety precautions described in this user’s manual. We assume
no liability for safety if users fail to observe these instructions when operating the product.
• If this instrument is used in a manner not specified in this user’s manual, the protection
provided by this instrument may be impaired.
• If any protection or safety circuit is required for the system controlled by the product or for
the product itself, prepare it separately.
• Be sure to use the spare parts approved by Yokogawa Electric Corporation (hereafter simply
referred to as YOKOGAWA) when replacing parts or consumables.
 
• The following symbols are used in the product and user’s manual to indicate that there are
precautions for safety:
n SignalWords
The following words are used in this manual.
CAUTION
This symbol gives information essential for understanding the operations and functions.
NOTE
This symbol indicates information that complements the present topic.
n NotesonHandlingUser’sManuals
• Please hand over the user’s manuals to your end users so that they can keep the user’s
manuals on hand for convenient reference.
• Please read the information thoroughly before using the product.
• The purpose of these user’s manuals is not to warrant that the product is well suited to any
particular purpose but rather to describe the functional details of the product.
• No part of the user’s manuals may be transferred or reproduced without prior written
consent from YOKOGAWA.
• YOKOGAWA reserves the right to make improvements in the user’s manuals and product at
any time, without notice or obligation.
 
contact our sales representative or your local distributor.
n WarningandDisclaimer
The product is provided on an “as is” basis. YOKOGAWA shall have neither liability nor
responsibility to any person or entity with respect to any direct or indirect loss or damage arising
from using the product or any defect of the product that YOKOGAWA can not predict in advance.
n TrademarkAcknowledgments
• EXA RC is a trademark of Yokogawa Electric Corporation.
• All other company and product names mentioned in this user’s manual are trademarks or
registered trademarks of their respective companies.
• We do not use TM or ® mark to indicate those trademarks or registered trademarks in this
user’s manual.
14th Edition : Jul. 15, 2020

iii
IM 12F4A1-01E
After-salesWarranty
nDonotmodifytheproduct.
nDuringthewarrantyperiod,forrepairunderwarrantycarryconsultlocalsales
representativeorserviceo󰀩ce.Yokogawawillreplaceorrepairanydamagedparts.
Beforeconsultingaproductforrepairunderwarranty,provideuswiththemodelname
andserialnumberandadescriptionoftheproblem.Anydiagramsordataexplainingthe
problemwouldalsobeappreciated.
• If we replace the product with a new one, we won’t provide you with a repair report.
• Yokogawa warrants the product for the period stated in the pre-purchase quotation

customer site is located outside of the service area, a fee for dispatching the maintenance
engineer will be charged to the customer.
nInthefollowingcases,customerwillbechargedrepairfeeregardlessofwarrantyperiod.
• Failure of components which are out of scope of warranty stated in instruction manual.
• Failure caused by usage of software, hardware or auxiliary equipment, which Yokogawa
Electric did not supply.
 󰀩
 
does not authorize.
 
• Failure caused by any usage out of scope of recommended usage.
 
radiation and other natural changes.
nYokogawadoesnotwarrantconformancewiththespecicapplicationattheuser
site.Yokogawawillnotbeardirect/indirectresponsibilityfordamageduetoaspecic
application.
nYokogawaElectricwillnotbearresponsibilitywhentheusercongurestheproductinto
systemsorresellstheproduct.
nMaintenanceserviceandsupplyingrepairpartswillbecoveredforveyearsafterthe
productionends.Forrepairforthisproduct,pleasecontactthenearestsaleso󰀩ce
describedinthisinstructionmanual.
14th Edition : Jul. 15, 2020

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IM 12F4A1-01E
Model RC400G
Residual Chlorine Analyzer
[Style: S4]
14th Edition : Jul. 15, 2020
CONTENTS
IM12F4A1-01E14thEdition
Introduction..............................................................................................................i
SafetyPrecautions..................................................................................................ii
After-salesWarranty..............................................................................................iii
1. Outline....................................................................................................... 1-1
1.1 RC400GResidualChlorineAnalyzerConguration..................................... 1-2
1.2 OperatingPrincipleofRC400GResidualChlorineAnalyzer....................... 1-3
2. Specications........................................................................................... 2-1
2.1 RC400GResidualChlorineAnalyzer.............................................................. 2-1
2.2 RC401GReagentTank.................................................................................... 2-10
3. Installation,TubingandWiring............................................................... 3-1
3.1 Installation......................................................................................................... 3-1
3.2 Tubing................................................................................................................. 3-1
3.2.1 Sample Water Tubing ........................................................................ 3-6
3.2.2 Reagent Tubing.................................................................................. 3-6
3.2.3 Cleaning Water Tubing ...................................................................... 3-7
3.2.4 Drain Tubing....................................................................................... 3-7
3.2.5 Purge Air Tubing................................................................................. 3-7
3.2.6 Standard Solution Tubing .................................................................. 3-7
3.2.7 Automatic Zero Calibration Tubing .................................................... 3-7
3.3 Wiring................................................................................................................. 3-8
3.3.1 Wiring for Power Supply and Grounding ......................................... 3-13
3.3.2 Wiring for Analog Output Signals..................................................... 3-14
3.3.3 Wiring for Contact Input (<remote> Range Switching).................... 3-14
3.3.4 Wiring for Contact Output ................................................................ 3-15
4. Operation................................................................................................... 4-1
4.1 ComponentIdenticationandFunction........................................................ 4-1
4.2 PreparationforOperation................................................................................ 4-4
4.2.1 Reagent Preparation.......................................................................... 4-4
4.2.2 Filling Bead Case with Electrode Polishing Glass Beads.................. 4-5
4.2.3 Checking the Sand in the Sand Filter ................................................ 4-6
4.3 Startup................................................................................................................ 4-6
  ................................. 4-6
4.3.2 Feeding Sample Water and Adjusting Flow....................................... 4-6

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IM 12F4A1-01E
4.3.3 Supplying Cleaning Water ................................................................. 4-6
4.3.4 Turning on Power............................................................................... 4-6
4.3.5  .................... 4-7
  .......................... 4-7
  ......................................... 4-8
 
Opening.............................................................................................. 4-9
4.3.9 Purging Air Supplying......................................................................... 4-9
4.3.10 Polishing Indicator Electrode ........................................................... 4-10
4.3.11 Filling the Zero Filter Case and Running-in Operation .................... 4-11
4.3.12 Output Range Setting ...................................................................... 4-11
4.3.13 Calibration........................................................................................ 4-11
4.4 Operation......................................................................................................... 4-12
5. ConverterOperation................................................................................ 5-1
5.1 ComponentIdenticationandFunctionsontheControlPanel.................. 5-1
5.2 OperationModesandFunctions..................................................................... 5-2
5.2.1 Function Codes and Their Description in <MEAS.> Mode................ 5-3
5.2.2 Function Codes and Their Description in <MAINT.> Mode ............... 5-4
5.2.3 Function Codes and Their Description in <PROGRAM.1> Mode..... 5-4
5.2.4 Function Codes and Their Description in <PROGRAM.2> Mode..... 5-6
5.3 KeyOperation.................................................................................................... 5-7
5.3.1 Operation Key Types and Functions ................................................. 5-7
5.3.2 Key Operation in <MEAS.> Mode ..................................................... 5-9
5.3.3 Key Operation in <MAINT.> Mode................................................... 5-10
5.3.4 Key Operations in <PROGRAM.1> Mode....................................... 5-21
5.3.5 Key Operation in <PROGRAM.2> Mode......................................... 5-32
6. ConverterOperatingFunctions.............................................................. 6-1
6.1 <failure>DetectingOperation......................................................................... 6-1
6.1.1 Concentration Range Exceeded (Err11) ........................................... 6-1
6.1.2 Sample Temperature Failure (Err12, Err24) ...................................... 6-1
6.1.3 Out-of-Sample in the Measuring Tank (Err13)................................... 6-1
6.1.4 Converter Failure (Err14, Err15, Err16, and Err17) ........................... 6-3
6.1.5 Concentration Upper Limit Setpoint Exceeded (Err25) ..................... 6-3
6.2 AnalogOutputSignal....................................................................................... 6-4
6.3 ContactOutput.................................................................................................. 6-4
6.4 ContactInput..................................................................................................... 6-4
6.5 DefaultStatusWhenModeChange................................................................ 6-5
7. Calibration................................................................................................. 7-1
7.1 Running-inOperation....................................................................................... 7-1
7.2 ZeroCalibration................................................................................................. 7-1
7.2.1 Zero Calibration Using Open Input Circuit Method............................ 7-1
7.2.2 Zero Calibration Using Chlorine-Free Water .................................... 7-2
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IM 12F4A1-01E
7.2.3 Automatic Zero Calibration Using Chlorine-Free Water ................... 7-3
7.3 SpanCalibration............................................................................................... 7-5
8. Maintenance.............................................................................................. 8-1
8.1 Inspection/MaintenanceItemsandIntervals................................................. 8-1
8.2 ReagentReplenishment................................................................................... 8-1
8.3 IndicatorElectrodePolishing.......................................................................... 8-1
8.4 GlassBeadsandMeasuringTankCleaning.................................................. 8-2
8.5 Calibration......................................................................................................... 8-3
8.6 MeteringPumpDrivingSectionOiling........................................................... 8-3
8.7 Replacementof“Bellofram”andValveSheetinMeteringPump............... 8-3
8.7.1 “Bellofram” Replacement ................................................................... 8-4
  ................................................................. 8-5
8.8 MeteringPumpDeliveryFlowRateConrmationandAdjustment............ 8-5
8.9 InspectionandMaintenanceofSandFilters................................................. 8-6
8.9.1 Inspection of Sand Filter Surface....................................................... 8-6
8.9.2 Checking the Sand Sand Filters ....................................... 8-6
8.9.3 Checking the Discoloration of Sand in Sand Filters .......................... 8-7
8.9.4 Filter Replacement............................................................................. 8-7
8.10 InspectionofElectrodeMechanismBlockandReplacementofDamagedParts
8-8
8.10.1 Check/Maintenance/Replacement of Rotating contact..................... 8-9
8.10.2 Inspection, Maintenance and Replacement of Drive Belt ............... 8-10
8.10.3 Inspection, Maintenance and Replacement of Driven Shaft Assembly8-11
8.10.4 Inspection, Maintenance and Replacement of Motor Assembly/Gear
Head................................................................................................. 8-13
8.10.5 Replacement of Activated Charcoal Filter ....................................... 8-14
9. Troubleshooting....................................................................................... 9-1
9.1 When<failure>isIndicated............................................................................. 9-1
9.1.1 Indication of Error Message or Error Code During Operation ........... 9-1
9.1.2 <FAIL> Lamp Lit................................................................................. 9-4
9.2 OperationFailuresinMeasurementWithout<failure>Detection............... 9-8
9.3 OtherFailures.................................................................................................. 9-10
  ................ 9-10
9.3.2 Cleaning is not Conducted Properly. ............................................... 9-10
9.3.3 “Remote” Range Switching does not Work. .................................... 9-10
CustomerMaintenancePartsList................................... CMPL12F04A01-04EN
CustomerMaintenancePartsList...................................... CMPL12F04A01-11E
10. SparePartsandConsumables............................................................. 10-1
RevisionInformation...............................................................................................i
14th Edition : Jul. 15, 2020

Blank Page

<1. Outline> 1-1
IM 12F4A1-01E
1. Outline
Inchlorinatedtapwaterandindustrialwater,thechlorinatione󰀨ectcanbedeterminedby
measuringresidualchlorinecontact.
TheRC400GResidualChlorineAnalyzerisforprocessuseandemploysrotating
electrodepolarographyasitsmeasuringprinciple.
Itcanbeusedforcontinuousmeasurementofresidualchlorinecomposedoffree
availablechlorineandcombinedavailablechlorineorforfreeavailablechlorineonly.
The RC400GResidualChlorineAnalyzerincludes“TapWatertype(ModelRC400G-1)”
suitableformeasurementoftapwaterorlteredwater,“RawWatertype(Model
RC400G-2)”suitableformeasurementofrawwaterand“TreatedWatertype(Model
RC400G-3)”suitableformeasurementoftreatedwatersuchassewerwaterafter
secondarytreatmentorplantwastewater.
l CombinedChlorineInsensitiveVersion
If raw water contains large quantities of ammonia nitrogen, combined chlorine will form
󰀩
prechlorination point. In particular, when the pH and temperature of the water are low, combined
chlorine (dichloramine) remains longer and breaks down slowly.
In measurement of free available chlorine in sample water that contains a high concentration of
combined chlorine, measurement errors may occur when the previous model of residual chlorine
analyzer is used. To solve this problem the combined chlorine insensitive version should be used.


and applied voltage have been changed, otherwise, the measurement principle, equipment,

In this chapter, the operating principle and structural outline of the RC400G Residual Chlorine
Analyzer is described.
F1.1E.ai
Converter
Detector
Metering pump
Front Side Back
Figure1.1 AppearanceofRC400GResidualChlorineAnalyzer(RC400G-1,TapWatertype)
14th Edition : Jul. 15, 2020

<1. Outline> 1-2
IM 12F4A1-01E
1.1 RC400GResidualChlorineAnalyzer
Conguration
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.
n 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.
󰀨
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
󰀨
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
󰀨

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
n 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


treated water), and a metering pump.
14th Edition : Jul. 15, 2020

<1. Outline> 1-3
IM 12F4A1-01E


iodine.
Another metering pump is incorporated in the reagent tubing to mix reagent from the reagent

n AirTubingSystem
The “air tubing system” consists of air purge tubing, etc.. The air purge tubing is provided for
preventing the components of electrode drive assembly, the converter, pump drive assembly, etc.
from corrosion due to halogen gases generated from the sample water.
When an air pump is included in the system, it supplies purging air. If no air pump is attached,
connect the system through a regulating valve to a clean and dry air source like instrument air.
n CleaningTubingSystem


Cleaning is automatically carried out by opening and closing the solenoid valve in cleaning water
tubing with sequence signals from the converter. The cleaning water tubing is also provided with
a regulating valve to adjust the cleaning water pressure.
n AutomaticZeroCalibrationTubingSystem
The residual chlorine analyzer with automatic zero calibration performs zero calibration using an

closed by a sequence signal from the converter.
1.2 OperatingPrincipleofRC400GResidual
Chlorine Analyzer
The measuring object of the RC400G residual Chlorine Analyzer is either free available chlorine
or combined available chlorine.
Free available chlorine exists in the forms of chlorine (Cl2), hypochlorous acid (HClO), or
hypochlorite ion (ClO-) in water. Combined available chlorine exists in the from of chloramines,
such as trichloramine (NCl3) and dichloramine (NHCl2), generated through reactions of chlorine
with ammonia nitrogen from contaminants in polluted rivers and other sources.
The residual chlorine analyzer operates on the principle of rotating electrode polarography.
Measurement of free available chlorine content or total residual chlorine content including free
and combined available chlorine contents can be performed by adequate selection of reagent,
electrode and applied voltage.
For measurement of total residual chlorine, reaction of chlorine with sample water added with
potassium iodide (KI) is implemented. Since KIis dissociated into K+and I-in aqueous solution,
the iodine equivalent to the amount of residual chlorine is liberated as shown in equations (1), (2),
(3) and (4).
Free available chlorine Cl2+ 2l-l2+ 2Cl-........................................ (1)
NH2Cl (monochloramine) + 2l-+ 2H+
l2+ NH4Cl ................................ (2)
Combined available chlorine NHCl2+ 4l-+ 3H+2l2+ NH4Cl + Cl-........ (3)
NCl3+ 6l-+ 4H+3l2+ NH4Cl + 2Cl-................ (4)
The iodine concentration (indirectly chlorine concentration) is determined by applying a voltage
across the indicator and counter electrodes to conduct electrolytic reduction of the free iodine and
simultaneously measuring the current.
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<1. Outline> 1-4
IM 12F4A1-01E
Therefore, the voltage to be applied is selected as a value at which the so-called polarograph
concentration polarization occurs, that is, current does not change when voltage changes. For

󰀨
󰀩
󰀨󰀩

In addition to potassium iodide, acetic acid and sodium acetate are added to the reagent to make
󰀨󰀨
the pH of sample water to 4.5 or below.
For measurement of free available chlorine content, potassium bromide (KBr) is added to sample
water and bromine is liberated by reacting with chlorine as seen in equation (5).
Cl2+ 2Br-Br2+ 2Cl-........................................................ (5)
Except for the liberation of bromine, the measurement of free available chlorine is the same as
the measurement of total residual chlorine.
Figure 1.4 illustrates the principle of the RC400G Residual Chlorine Analyzer.


Temperature compensation is implemented through CPU computation based on temperature
signals from the temperature-measuring circuit.
Amplifier
Is
ME
RE
Measuring tank
4 to 20 mA DC,
or 1 to 5 V DC
Voltage-
application
circuit
Temperature-
measuring
circuit
Current/
voltage
conversion
circuit
Current/
voltage
output
circuit
LED
indicator
CPU
F1.4.ai
Counter electrode
Indicator electrode
Figure1.4 SchematicDiagramofMeasuringCircuit
14th Edition : Jul. 15, 2020

  <2.Specications> 2-1
IM 12F4A1-01E
2. Specications
Inthischapter,specicationsaregivenfortheRC400GResidualChlorineAnalyzer,theRC401GReagent
Tankandothers.
2.1 RC400GResidualChlorineAnalyzer
n Standardspecications
Measurement object: Free chlorine or residual chlorine (total chlorine) in water
Measurement method: Rotating electrode type polarographic system
Measurement range: 0 to 10 mg/l (mg/l used as concentration units per JIS K0101 and
municipal water test methods)
Output range: Can be freely set within ranges with spans of 1 mg/l or greater. (Range
set when shipment. No.1: 0 to 5 mg/l No.2: 0 to 10 mg/l. Allows selection
between 2 ranges (selected with contact input signal).
 

range.
 
resistance, 300 Max.), isolated
Display range: -1.00 to 12.00 mg/l
Display method: Digital display (4-digit LED)
 
 
 
 
 
 
 
Closed circuit current: 100 mA

Contact inputs:
Remote range switching: Switching between 2 preset ranges (range 1 and range 2)
Contact open: Range 1
Contact closed: Range 2
Contact outputs:
FAIL contact: Activate when concentration over range, measurement

compensation over range, setting upper limit exceeded
Range switching contact
MAINT contact: Activate when analyzer is in maintenance mode
MainpowerOFF MainpowerON
--- Notoperating Operating
FAIL contact Open Closed Open
MAINT contact Closed Open Closed
14th Edition : Jul. 15, 2020

  <2.Specications> 2-2
IM 12F4A1-01E
Sample conditions:
Temperature: 0 to 50 °C
pH: 3 to 9 pH
Flow: 1 to 4 l/min, for pure water or municipal water application.
5 to 10 l/min, for raw water or sea water application.
10 to 20 l/min, for secondary sewage treatment application.
Pressure: 20 to 500 kPa
Electrodes:
Indicator electrode: Rotating gold alloy electrode
 
insensitive version uses a silver chlorine electrode (built-in Pt1000

Reagents:
Composition: The following reagents are dissolved in pure water to give 100 l of
solution.
(Note) Pure water should be equal to or exceed level of tap water and should not contain oxidizing and reducing substances
such as chlorine.
Forresidualchlorine
measurement
Forfreechlorine
measurement
Forcombinedchlorine
measurement
Maximum
concentration Upto6mg/l Over6upto10mg/l Upto10mg/l Upto10mg/l
Potassium iodide,
extra pure 500 g 1000 g --- ---
Potassium bromide,
extra pure --- --- 4000 g 4000 g
Sodium acetate,
extra pure 150 g 1000 g 5400 g
Acetic acid, extra
pure 1000 ml 1000 ml 200 ml
Consumption: 1.5 ml/

 l/
 l/
Converter functions:
Display functions:
 󰀨

Status indicators: Measurement, maintenance, hold, calibration in progress,
cleaning, fail
Operating status : Rotating gold alloy electrode, mertering pump, air pump,
solenoid valve ON/OFF
Diagnostic functions: Concentration over range, measurement temperature error, no liquid in

upper limit exceeded, zero point error, slope error, response error
Maintenance functions (MAINT mode):
 

error information
Setup functions:
PROGRAM 1 mode
Output Range 1 and Range 2 settings, 2-line-segment output setting,
applied voltage setting, response time and stability parameter settings,
contact output during FAIL condition (ON/OFF), indication hold during
MAINT (ON/OFF), remote range switching ON/OFF
14th Edition : Jul. 15, 2020

  <2.Specications> 2-3
IM 12F4A1-01E
PROGRAM 2 mode
Cleaning sequence setup, auto zero calibration sequence setup

For pure water: Glass-bead cleaning
For raw/sea water, secondary sewage treatment:
  
2 to 3 l/min

 
550 ml per tube)
 
 
Standardcleaningsequence(factorysettings)
1-cylindersystem 2-cylindersystem Settingrange
 2 hours 30 min 0.1 to 24 h, 0.1 h steps
 1 min 1 min 0.1 to 25 min, 0.1 min steps
Flow cell jet cleaning interval 2 hours 1 hour 0.1 to 24 h, 0.1 h steps
Flow cell jet cleaning time 1 min 1 min 0.1 to 25 min, 0.1 min steps
Waiting time 5 min 3 min 0.1 to 25 min, 0.1 min steps
Output hold time 6 min 4 min Jet cleaning time + waiting time

Wetted part materials
Measurement tank: Acrylic resin
 
 
Stand materials: Carbon steel or stainless steel
Paint colors
Mounting stand: Munsell 0.6GY3.1/2.0
Other parts: Munsell 0.6GY3.1/2.0 and 2.5Y8.4/1.2
Finish: Baked polyurethane resin coating
Operating conditions
Ambient temperature: -5 to 55 °C (However, measure to prevent freezing are required if
the water sample or reagent appears to freeze.)
 
Storage temperature: -30 to 70 °C
Installation: Indoors (A separate rainproof cover is required for outdoor
installation. Avoid direct sunlight.)
Utilities
 
Power consumption:
RC400G-1 
RC400G-2 
RC400G-3 

Quality: clean water
Pressure: 100 to 500 kPa
Flow: 10 to 12 l/min
 
 
(With standard cleaning sequence [factory settings])
14th Edition : Jul. 15, 2020

  <2.Specications> 2-4
IM 12F4A1-01E
Air purge (using instrument air)
Supply pressure:140 kPa
Air consumption:Approx. 5 l/min
Weight
For pure water: Approx. 65 kg
For raw water (1-cylinder): Approx. 70 kg
For raw water (2-cylinder): Approx. 75 kg

Pump for air purge (if instrument air cannot be used)
Install to enable intake of clean air.
Intake/discharge: 5 l/min, at 50 Hz (Intake/discharge outlets: Open)
Maximum pressure: 80 kPa
 
Weight: Approx. 2 kg
RegulatoryCompliance:
EMC Regulatory Arrangement in Australia and New Zealand (RCM)
EN 55011 Class A, Group 1
Korea Electromagnetic Conformity Standard Class A 한국 전자파적합성 기준
A급 기기 (업무용 방송통신기자재)
이 기기는 업무용(A급) 전자파적합기기로서 판매자 또는
사용자는 이 점을 주의하시기 바라며, 가정외의 지역에서
사용하는 것을 목적으로 합니다.
nCharacteristics
(Percent display is computed with respect to whichever of output range 1 or output range 2 has
the highest upper range value)
 
 
Drift:  
 
 
For pure water: Approx. 3 min
For raw water: Approx. 4 min (Within 3 min from standard liquid inlet)
Temperature compensation error (water temperature):
  
󰀨 
󰀨 
󰀨 
chlorine insensitive version
14th Edition : Jul. 15, 2020

  <2.Specications> 2-5
IM 12F4A1-01E
n Productmodelandsu󰀩xcodes
[Style: S4]
Model Su󰀩xcode Option
code Description
RC400G --------------------------------- ---------- Residual chlorine analyzer
Application
(cleaning unit)
(*1)
-1 ---------- For pure water, for municipal water (with glass-bead
cleaning)
-2 ---------- For raw water (1-cylinder) (with glass-beads cleaning, jet

-3 ---------- For raw water (2-cylinder) (with glass-beads cleaning, jet

Output signal 5---------- 
6---------- 4 to 20 mA DC
Power supply 1---------- z
2---------- 
3---------- 
4---------- 
5---------- z
6---------- z
7---------- 
8---------- 
Measurement object
(*2)
F---------- Free chlorine
T---------- Residual chlorine (total chlorine)
C---------- Combined chlorine insensitive version (free chlorine) (*3)
--N ---------- Always -N
-*A ---------- Always A
 /AP1 
/AP3 
/AP5 
/AP7 
/PPM Units: ppm
/NR Without reagent set for start-up (*4)
/SCT Stainless tag plate
/S Stainless stand (*5)
/AZC With automatic zero calibration
/ARS With arrestor (power and signal lines)
*1: “Application” indicates general guidelines. Select the cleaning equipment appropriate for the contamination in the sample.
*2: Measurement object selection is indicated in the following.
 󰀨
*4: When ordering the RC400G, select /NR and get reagent sets for start-up from local reagent supplier.
These reagent sets can not be exported from Japan due to both safety and transportation issues.
*5: Stanchion, base and bracket are stainless steel.
*6: Please contact Yokogawa regarding the adequate number of the cylinder.
*7: Installation of air purge is always required for all application. If instrument air cannot be used, select the air purge pump.
14th Edition : Jul. 15, 2020

  <2.Specications> 2-6
IM 12F4A1-01E
Application Measurementobject
Freechlorine Total chlorine
 (*1) 
 (*1) 
  
Sea water xx (*3)
󰀪 x x
Factory cooling water (industrial water) x(*2)
Factory drinking water  
Sewage secondary treatment xx (*3)
: Can be measured x: Cannot be measured
*1: If ammoniacal contaminants are present in large quantity, high concentrations of combined chlorine may remain if sampling
is performed soon after chlorine injection in prechlorination treatment, or in intermediate treatment without prechlorination
treatment. In this case, combined chlorine type is recommended.
*2: Oxidizing or reducing agents other than chlorine may be present. If so, chlorine concentration measurement may not be possible.
*3: There are Residual chlorine analyzer for sewage secondary treatment or sea water. Please ask Yokogawa.
lAccessories
Name Quantity Remark
Polishing powder 1 bottle For polishing electrode
Lubricating oil 1For metering pump drive
Fuses 4 each 1 A and 3 A (for spare)
Glass beads 1(including for spare) (2 bags)
 4For metering pump (for spare)
Bellofram 1For sample pump (for spare)
1For reagent pump (for spare)
Special tool 1For pump valve replacement
Tool 1For Bellofram replacement
Allen wrenches 1 set 1.5, 2, 2.5, 4, 5, 6 (mm)
Reagent set (*) For startup
Belt tension
adjuster plate 1
(*) These reagents sets are not imported from Japan because of both safety and transportation cost issues.
Purchase them directly in your local reagent supplier.
l Spareparts
Refer to Chapter 10.
l Reagent
Reagents cannot be imported from Japan. Purchase them from local suppliers. Refer to 4.2.1 for
information on the required amount of each reagent.
14th Edition : Jul. 15, 2020

  <2.Specications> 2-7
IM 12F4A1-01E
n Flowdiagramsandoutlinedrawings
(1) RC400G-1Residualchlorineanalyzerfortapwater
3-way solenoid
valve (SV6)
Converter
600
530 Approx. 200Approx. 200
93
80
60 4085
150150
50
550
350 100100
1450
120
530
2020 490
(AP)
(PU)
(V2)
AA
Standard solution inlet
Rc1/4(female)
Reagent inlet
Rc1/4 (female)
Air purge inlet
Rc1/4(female)
Stand
Front
Detector
Power terminal
box (*1)
Air pump (*3)
Meas. / Std. solution
switching valve
Activated
charcoal filter
(F11) (*2)
Metering
pump
Ball valve
(V11,12)
(*2)
(*2)
Head tank
(HD)
Ball valve
(V1) Ball valve (*2)
(V4)
(*2)
(*1) Option / ARS applies to model with arrestors
(*2) Option / AZC applies to model with auto zero calibration
(*3) Option / APapplies to model with air purge pump
F2_1E.ai
unit : mm
Approx. 500
(CON)
(CELL)
4-ø15 holes
for anchor bolt
Ball valve (V3)
Strainer (S1)
Cross section A-A
Maintenance
space
Maintenance
space
Maintenance
space
Measuring
sample inlet
VP16 pipe
Drain
VP40 pipe
Pressure reducing
valve (*2) (PR)
Tap water inlet
VP16 pipe
14th Edition : Jul. 15, 2020