YOKOGAWA PH450G User manual

User’s
Manual Chemical Cleaning
pH Measuring System
IM 12B07W01-04EN
IM 12B07W01-04EN
1st Edition

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IM 12B07W01-04EN 1st Edition : Nov. 11, 2016-00
uIntroduction
nChemical Cleaning pH Measuring System
Thank you for purchasing Chemical Cleaning pH Measuring System.
To have the system deliver its full capabilities, read this instruction manual thoroughly before you
use it. For safety reasons or to avoid possible damage to your equipment, strictly adhere to every
cautionary note that appears in this manual.
Chemical Cleaning pH Measuring System features automatic chemical cleaning of the pH sensor
without removing pH sensor, while maintaining its performance in pH measurement.
System Conguration of Chemical Cleaning pH Measuring System is as below;
Chemical Cleaning pH Measuring System
pH/ORP Converter 2-wire Analyzer
Chemical Cleaning unit PH8SM3-E PH8SM3-G or PH8SM3-F
pH analyzer PH450G FLXA202 or FLXA21
Distributor ―PH201G
pH sensor PH8EFP-□-TT2 (Note)
Holder PH8HS3
(Note) You can select WTB10 Terminal Box, if necessary.
This document describes mainly PH8SM3 unit of the system and PH8HS3 Holder. For further
information on other products, please read corresponding manual attached to each product.
The related documents to each product:
General Specications
Product Model Document Name Document number
PH8SM3, PH8HS3, PH201G Chemical Cleaning pH measuring System GS 12B7A1-E
PH450G PH450G pH and Redox (ORP ) Converter GS 12B07C05-01E
FLXA202 FLXA202 2-Wire Analyzer GS 12A01A03-01EN
FLXA21 FLXA21 2-Wire Analyzer GS 12A01A02-01E
PH8EFP, WTB10 pH and ORP Sensors GS 12B07B02-E
* the “E” or “EN” in the document number is a language code.
User’s Manual
Product Model Document Name Document number
PH8SM3, PH8HS3 Chemical Cleaning pH measuring System
IM 12B07W01-04EN(this document)
PH450G PH450G pH and ORP Converter IM 12B07C05-01E
FLXA202, FLXA21 FLXA202/FLXA21 2-Wire Analyzer IM 12A01A02-01E
PH201G PH201G Distributor IM 19B01E04-02E
PH8EFP, PH8EFP, KCI Filling type pH sensor IM 12B7J1-01E
WTB10 WTB10-PH□ Terminal Box IM 19D01B01-01E
* the “E” in the document number is the language code.
nNotes 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.
Media No. IM 12B07W01-04EN 1st Edition : Nov. 2016 (YK)
All Rights Reserved Copyright © 2016, Yokogawa Electric Corporation

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IM 12B07W01-04EN 1st Edition : Nov.11, 2016-00
• 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.
• If you have any questions, or you nd mistakes or omissions in the user’s manuals, please
contact our sales representative or your local distributor.
nDrawing Conventions
Some drawings may be partially emphasized, simplied, or omitted, for the convenience of
description.
Some screen images depicted in the user’s manual may have different display positions or
character types (e.g., the upper / lower case). Also note that some of the images contained in this
user’s manual are display examples.
nInspection on delivery
Each component of Chemical Cleaning pH Measuring Systems comes in a separate package.
However, PH450G pH/ORP Converters (or FLXA202/FLXA21 2-Wire Analyzer ) are delivered
with factory-installed in PH8SM3 Chemical Cleaning pH Measuring Unit ,
After the delivery, open the package carefully and inspect for damages caused during transport.
Should there be any damage or breakage on the product, please contact YOKOGAWA
immediately and keep all the packing materials, containers and boxes that came with the
product.
After the unpacking, make sure the delivered products include all of the component equipment
you ordered.
After completing the unpacking, make sure that the delivered component covers all of the
required specications. When conrming the specications, refer to the model and sufx codes
indicated on the nameplate on the instrument. The models are indicated on the name plates.
Check also those of accessories. For further information on PH8SM3 or PH8HS3, please read
subsection 1.2 of this document.
lUnpacking and handling
When unpacking, place the instrument on a level surface in the position in which the instrument
will actually be installed, (Do not allow the package to undergo any intense mechanical shock by
turning it over on its side.) Avoid applying any excess force to the pipes and cables. Otherwise, a
defective pipe and / or cable connection may result
PH8SM3 Chemical Cleaning pH Measuring Unit weighs approximately 50 kg. It is recommended
that the product be unpacked as near your installation location as possible.

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IM 12B07W01-04EN 1st Edition : Nov. 11, 2016-00
uSafety 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 specied 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.
• Modication of the product is strictly prohibited.
• The following safety symbols are used on the product as well as in this manual.
WARNING
This symbol indicates that an operator must follow the instructions laid out in this manual in
order to avoid the risks for the human body and health including risk of injury, electric shock, or
fatalities. or the damages to instruments. The manual describes what special care the operator
must take to avoid such risks.
CAUTION
This symbol indicates that the operator must refer to the instructions in this manual in order to
prevent the instrument (hardware) or software from being damaged, or a system failure from
occurring.
The following are signal words to be found only in our instruction manuals.
CAUTION
This symbol gives information essential for understanding the operations and functions.
NOTE
This symbol indicates information that complements the present topic.
nWarning 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.
nTrademark policy
FLEXA, FLXA, SENCOM are the registered trade marks and trade names of Yokogawa’s
products. All other company and product and product names mentioned in this document are
trade names, trademarks or registered trademarks of their representative companies. In this
document, trademarks or trade names are not indicated with TM or ® as trademark symbols.

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IM 12B07W01-04EN 1st Edition : Nov.11, 2016-00
uAfter-sales Warranty
nDo not modify the product.
nDuring the warranty period, for repair under warranty, carry or send the product
to the local sales representative or service ofce. Yokogawa will replace or
repair any damaged parts and return the product to you. Before returning 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
Yokogawa shall conduct dened warranty service based on its standard. When the
customer site is located outside of the service area, a fee for dispatching the maintenance
engineer will be charged to the customer.
nIn 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.
• Failure due to improper or insufcient maintenance by user.
• Failure due to modication, misuse or outside-of-specications operation which Yokogawa
does not authorize.
• Failure due to power supply (voltage, frequency) being outside specications or abnormal.
• Failure caused by any usage out of scope of recommended usage.
• Any damage from re, earthquake, storms and oods, lightning, disturbances, riots, warfare,
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 ofce described in this instruction manual.

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IM 12B07W01-04EN 1st Edition : Nov. 11, 2016-00
Chemical Cleaning
pH Measuring System
CONTENTS
IM 12B07W01-04EN 1st Edition
uIntroduction....................................................................................................i
uSafety Precautions ......................................................................................iii
1. General ...................................................................................................... 1-1
1.1 Standard Specications................................................................................... 1-1
1.2 Model and Sufx Codes ................................................................................... 1-4
1.3 External Dimensions ........................................................................................ 1-6
2. Installation................................................................................................. 2-1
2.1 Installing the PH8SM3 Chemical Cleaning Unit for a Chemical Cleaning Sys-
tem ...................................................................................................................... 2-1
2.1.1 Where to install the unit...................................................................... 2-1
2.1.2 Installation Facilities........................................................................... 2-2
2.1.3 Installing Chemical Cleaning Unit...................................................... 2-2
2.2 Installing the PH8HS3 Holder .......................................................................... 2-3
2.2.1 Where to install the holder ................................................................. 2-3
2.2.2 Installation Facilities........................................................................... 2-3
2.2.3 Installing the PH8HS3 Holder............................................................ 2-4
3. Piping and Wiring..................................................................................... 3-1
3.1 Piping ................................................................................................................. 3-1
3.1.1 Line for Connecting Air Source .......................................................... 3-2
3.1.2 Line for Actuating Cylinder to Drive Sensor Pneumatically (Upward)3-2
3.1.3 Line for Actuating Cylinder to Drive Sensor Pneumatically (Downward)3-2
3.1.4 Line for Forced Feeding of Chemical Solution and Air-bubbling ....... 3-2
3.1.5 Line for Pressurizing KCl Reserve Tank ............................................ 3-2
3.2 Wiring ................................................................................................................. 3-3
3.2.1 Wiring for Intelligent Two-wire pH Transmitter System...................... 3-4
3.2.2 Wiring system with 2-Wire Analyzer .................................................. 3-6
4. Operation................................................................................................... 4-1
4.1 Names and Functions of Components........................................................... 4-1
4.2 How the Chemical Cleaning pH Measuring System Works ......................... 4-3
4.2.1 Operating Modes ............................................................................... 4-3
4.2.2 WASH (Cleaning) Command............................................................. 4-3
4.2.3 Wash Sequence................................................................................. 4-4
4.3 Startup................................................................................................................ 4-5
4.3.1 Inspection of Piping and Wiring ......................................................... 4-5

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4.3.2 Supplying Chemical Solution to Holding Tank................................... 4-5
4.3.3 Supplying KCl Solution to Reserve Tank ........................................... 4-6
4.3.4 Adjustment of Pneumatic Pressure ................................................... 4-6
4.3.5 Setting Duration of Forced Feeding of Chemical Solution and Output of
CYLINDER FAIL Signal ..................................................................... 4-7
4.3.6 Supplying Power................................................................................ 4-7
4.3.7 Entering Data Related to WASH Operation....................................... 4-7
4.3.8 Verifying WASH Operation ................................................................ 4-8
4.3.9 Calibration with Standard Solution .................................................... 4-8
4.4 Regular Operation............................................................................................. 4-8
4.4.1 Data Acquisition in Early Stages of Operation................................... 4-8
4.4.2 Inspections During Regular Operation .............................................. 4-9
4.4.3 Behaviour During Power Failure/Restart........................................... 4-9
4.4.4 Operation When Shutting Down the System..................................... 4-9
4.4.5 Procedure When Restarting System Operation .............................. 4-10
5. Inspection and Maintenance................................................................... 5-1
5.1 Inspection and Maintenance of Operating Unit for PH8SM3 Chemical Cleaning
System ............................................................................................................... 5-1
5.1.1 Inspection of Piping (between chemical cleaning chamber and holder)5-1
5.1.2 Inspection of Solenoid Valves............................................................ 5-1
5.1.3 Replacement of Fuses in the Power Supply Box .............................. 5-2
5.2 Inspection and Maintenance of PH8HS3 Holder ........................................... 5-2
5.2.1 Removing Foreign Matter from Wetted Part of Sensor Holder ......... 5-2
5.2.2 Inspecting Gasket on the Bottom Plate of Cleaning Chamber.......... 5-2
5.2.3 Cleaning and Lubricating Pneumatic Cylinder for Driving the Sensor
Holder................................................................................................. 5-3
5.2.4 Inspecting O-rings on Sensor Holder ................................................ 5-4
5.2.5 Inspecting Terminal Block for Limit Switch......................................... 5-4
6. Troubleshooting ....................................................................................... 6-1
6.1 More Than 100 ml of Chemical Solution at a Time Is Being Fed to Holder 6-1
6.2 A Smaller Quantity of Chemical Solution Is Fed to Holder .......................... 6-2
6.3 CYLINDER FAIL Signal Appears ..................................................................... 6-2
6.4 When Liquid keeps leaking from bottom plate of Cleaning Chamber........ 6-2
6.5 Chemical Solution Cannot Be Fed into Cleaning Chamber......................... 6-3
Customer Maintenance Parts List (PH8SM3).................. CMPL 12B07W01-13E
Customer Maintenance Parts List (PH8HS3)....................CMPL 12B07W01-23E
Revision Record.......................................................................................................i

<1. General> 1-1
IM 12B07W01-04EN 1st Edition : Nov. 11, 2016-00
1. General
Chemical Cleaning pH Measuring System is designed to automatically clean pH electrodes
with a chemical solution while they remain in the system. The system is especially effective in
restoring the performance of a pH electrode which has been deteriorated through repeated
pH measurements of highly alkaline solutions. It is also effective in cleaning pH electrodes
contaminated with calcium sulfate (CaSO4) scale or calcium carbonate (CaCO3) scale.
1.1 Standard Specications
Chemical Cleaning pH Measuring System are congured as the table shown below.
Chemical Cleaning pH Measuring System
pH/ORP Converter 2-wire Analyzer
Chemical Cleaning unit PH8SM3-E PH8SM3-G or PH8SM3-F
pH analyzer PH450G FLXA202 or FLXA21
Distributor ―PH201G
pH sensor PH8EFP-□-TT2 (Note)
Holder PH8HS3
Note You can select WTB10 Terminal Box, if necessary.
The following are specication describing on PH8SM3 Chemical Cleaning Unit and PH8HS3
Holder. For more information on other products, please read corresponding instruction manuals
attached to each product.
nPH8SM3 Chemical Cleaning Unit
Cleaning Method:
Automatic chemical cleaning by air bubbling
Interval Time:
0.1 to 36.0 hours (To be set in the pH converter)
Wash Time:
0.1 to 10 min (factory setting: 4 min)(To be set in the pH converter)
Relaxation Time:
0.1 to 10 min. (factory setting: 0.5 min.)(To be set in the pH converter)
Bubbling (SV1: On) Time:
0 to 10 min. (factory setting: Approx. 2 min.)
Cylinder Failure Time:
0 to 1 min. (factory setting: Approx. 0.5 min.)
Structure:
Freestanding rack for indoor installation.(For the uv protection,when you install the unit
outdoors, specify tank cover and select Fluoropolymer (PTFE) tube, or specify hood if
necessary.
Main Components:
Chemical solution tank, control box, air-pressure regulator, and power supply unit (for pH/
ORP Converter only)

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Chemicals for Cleaning:
Acid solution (e.g., hydrochloric acid or diluted sulfuric acid), or alkali solution. Organic
solvents are not allowed.
Note: Select appropriate solution for effective cleaning.
Material, Finish, and Color of Main Components:
Control Box (K9729AN)
Material: Aluminum alloy casting
Colors:
Deep sea moss green (Munsell 0.6GY3.1/2.0) and frosty white (Munsell 2.5Y8.4/1.2)
Finish: Baked polyurethane resin coating
Power Supply Unit (for pH/ORP converter only)
Material: Carbon steel (body)
Color: Deep sea moss green (Munsell 0.6GY3.1/2.0 or equivalent)
Finish: Baked polyurethane resin coating
Mounting Rack
Material: Carbon steel
Color: Deep sea moss green (Munsell 0.6GY3.1/2.0)
Finish: Baked polyurethane resin coating
Chemical Solution Tank (20 L, 2 to 10 % diluted hydrochloric acid or diluted sulfuric acid.
Effective capacity; approximately 17 L, approximately 100 ml is used for each cleaning)
Material: Polyethylene resin (for solution tank), and hard PVC resin (for internal tank)
Tubing for Solution, Air, or KCl
Material of tubes: Polyethylene or Fluoropolymer (PTFE)
Mateirial of tting (joint): polypropylene resin or Fluoropolymer (PTFE)
Ambient Temperature: 0 to 45°C (Note ; Freezing protection is required if necessary.)
Power Supply: 100 V AC ±10%, 50/60Hz ±5%
Power Consumption: Approx. 60 VA
Air Supply: 300 to 950 kPa {3 to 9.5 kg/cm2}
Max. Air Consumption: Approx. 10 Nl/min.
External Dimensions:
500 (W) x 600 (D) x 1630 mm (H)
Weight: Approx. 50 kg (when the chemical tank is empty)
Output Contact Signal: Cylinder failure
Contact State: Normally open (close on error )
Contact Capacity: 24 V DC, 1 A, 110 V AC 0.3 A (resistance load)
Output:
pH/ORP Converter : 4 to 20 mA DC 2 points (isolated transmission output; maximum load of
600 Ω)
2-Wire Analyzer : 1 to 5 V DC (minimum resistive load of 2 kΩ)
Cable Connection: G 1/2 gland packing is supplied.
Terminal Size: M4
Outside Cable Diameter: Φ9 to Φ12 mm
Piping Connection: Air for Instrumentation: Rc 1/4 female thread
Note 1: Install the KCl reserve tank in an appropriate place at the job site or attached to the stand for the
chemical cleaning unit.

<1. General> 1-3
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Note 2: The wiring and piping between the chemical cleaning unit, sensor, KCl reserve tank, and holder are to
be done by the user.
Note 3: The wiring between the switch in the holder and the chemical cleaning unit is to be done by the user.
The terminal size is M4.
EMC Compliance: 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.
nPH8SM3 Holder
Functions:
Moves the pH sensor up or down using a pneumatic cylinder (air cylinder), and provides
chemical cleaning.
Structure: Constructed for indoor use (For outdoor installation, select Cylinder cover /SC as Option.)
Max. External Dimensions:
190 (W) x 170 (D) x Approx. 830 to 2030 mm (H) (when the sensor is raised)
Mounting:
Mounted on a 2-inch (50A) vertical pipe (outside diameter: 60.5 mm). Two mounting
brackets are supplied.
pH Sensor Up/Down Movement (nominal):
300 mm, 600 mm, 1000 mm, 1500 mm
Weight:
Approx. 8 kg (holder with 300 mm movement)
Approx. 10 kg (holder with 600 mm movement)
Approx. 12 kg (holder with 1000 mm movement)
Approx. 15 kg (holder with 1500 mm movement)
Materials
Frame: Baking nish over staineless steel
Color: Deep sea moss green (Munsell 0.6GY3.1/2.0 or equivalent)
Bottom Cover Pull-up Mechanism: Rod (PPS resin) and screws (PEEK)
Mounting bracket: staineless steel
Holder: Polypropylene and hard PVC (for part of a holder)
Solution Chamber: Hard PVC
O-ring: Fluororubber
Gasket: EPDM
Solution Temperature Range: -5 to 80°C
Ambient Temperature: 0 to 45°C
Flow Speed: 2 m/s or less
Provide an adequate ventilation when using chemicals.