YOKOGAWA PH8EHP User manual

User’s
Manual
Model PH8EHP
pH Sensor for High Purity Water
IM 12B7J2-01E
IM 12B7J2-01E
11th Edition

IM 12B7J2-01E
< Introduction > i
INTRODUCTION
This manual covers the PH8EHP pH Sensor for High Purity Water.
Other related items are described in the following manuals.
Model Title IM No.
PH8HH pH Holder for High Purity Water IM 12B07P01-01E
PH8AX Accessories for pH Meter IM 12B07W03-01E
PH400G Four-wire Type pH Converter IM 12B7C1-02E
PH450G Four-wire Type pH Converter IM 12B07C05-01E
FLXA402 4-Wire Converter IM 12A01F01-02EN
IM 12A01F02-01EN etc.
PH202G, S Two-wire Type pH Transmitter IM 12B07D02-01E
PH202SJ TIIS Intrinsic safe pH/ORP Transmitter IM 12B07D02-11E
FLXA202, FLXA21 Two-wire Liquid Analyzer IM 12A01A02-01E
WTB10-PH¨Terminal Box IM 19D01B01-01E
PH8TBG Terminal Box IM 12B07W01-01E
Media No. IM 12B7J2-01E 11th Edition : Nov. 2018 (YK)
All Rights Reserved Copyright © 1983, Yokogawa Electric Corporation
11th Edition : Nov.20,2018-00

IM 12B7J2-01E
< Introduction > ii
For the safe use of this equipment
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.
• 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 symbols are used in the product and user’s manual to indicate that there are
precautions for safety:
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.
• 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.
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.
nCompliance with the simple apparatus requirements
PH8EHPmeetthesimpleapparatusrequirementsdenedinthefollowingstandards.
Note: TIIScertiedtypescannotbeconnected.
Use the sensors under the conditions of use required by the standards.
Applicable standards:
ANSI/ISA-60079-11 (2014)
ANSI/ISA-60079-0 (2009)
CAN/CSA-C22.2 NO. 60079-11:14
CAN/CSA-C22.2 NO. 60079-0:11
방호장치 의무안전인증 고시
GB 3836.4-2010
11th Edition : Nov.20,2018-00

IM 12B7J2-01E
< Introduction > iii
Conditions of use:
(1) Use in combination with an internally isolated transmitter, or use with, a transmitter in
combination with isolated barrier.
The FLXA21 is internally isolated.
(2) Upper limit of the process temperature.
The upper limit of process temperature is indicated below when the sensor is used in
combination with a YOKOGAWA transmitter.
ForFLXA21,modelandsu󰀩xcodebelowisavailable.
FLXA21-D-□-D-EA-P1-○-A-N-LA-N-NN
 □canbeanyvalue.
 ○mustbeNNorP1.
Any option code is available.
ForPH202S,modelandsu󰀩xcodebelowisavailable.
 PH202S-○-E
 ○mustbeCorU.
There are no PH202S models that meet the Korean explosion proof standards.
Any option code is available.
Upper limit of process temperature on the PH8EHP
Transmitter used in combination FLXA21 PH202S
Ambient temperature Ta
Temperature class 40°C 60°C 40°C 60°C
T6 16 16 28 28
T5 50 31 50 43
T4 50 50 50 50
T3 50 50 50 50
T2 50 50 50 50
T1 50 50 50 50
Other warnings are provided in the following.
WARNING
Handling precautions:
(1) Potential electrostatic charging hazard Electrostatic charge may cause an explosion hazard.
Avoid any actions that cause the generation of electrostatic charge, e.g., rubbing with a dry
cloth.
(2) Because the solution ground tip contains titanium, ignition sources due to impact and friction
sparks are excluded.
(3) IEC60079-14 (Electrical installations in hazardous areas) requires a label indicating ‘simple
apparatus’, stick this label to this sensor if necessary.
11th Edition : Nov.20,2018-00

IM 12B7J2-01E
< Introduction > iv
nSymbol Marks
Throughoutthisuser’smanual,youwillndseveraldi󰀨erenttypesofsymbolsareusedtoidentify
di󰀨erentsectionsoftext.Thissectiondescribestheseicons.
WARNING
Indicates a potentially hazardous situation which, if not avoided, could result in death or serious
injury.
CAUTION
Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate
injury. It may also be used to alert against unsafe practices.
IMPORTANT
Indicates that operating the hardware or software in this manner may damage it or lead to system
failure.
NOTE
Draws attention to information essential for understanding the operation and features.
Tip
This symbol gives information that complements the current topic.
SEE ALSO
Thissymbolidentiesasourcetobereferredto.
11th Edition : Nov.20,2018-00

IM 12B7J2-01E
< Introduction > v
After-sales Warranty
nDo not modify the product.
nDuring the warranty period, for repair under warranty consult the local sales
representativeorserviceo󰀩ce.Yokogawawillreplaceorrepairanydamaged
parts. Before consulting 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.
lIf we replace the product with a new one, we won’t provide you with a repair report.
lYokogawa 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insu󰀩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o󰀩cedescribedinthisinstructionmanual.
11th Edition : Nov.20,2018-00

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vii
IM 12B7J2-01E
<CONTENTS>
11th Edition : Nov.20,2018-00
Model PH8EHP
pH Sensor for High Purity Water
CONTENTS
IM 12B7J2-01E 11th Edition
INTRODUCTION.............................................................................................i
For the safe use of this equipment.............................................................ii
After-sales Warranty ....................................................................................v
1. Specication ............................................................................................. 1-1
1.1 StandardSpecications................................................................................... 1-1
1.2 ModelandSu󰀩xcodes.................................................................................... 1-2
1.3 External Dimensions ........................................................................................ 1-4
2. Installation................................................................................................. 2-1
2.1 Preparation for Installation .............................................................................. 2-1
2.1.1 Unpacking and Inspection ................................................................. 2-1
2.1.2 Mounting Glass Electrode.................................................................. 2-2
2.1.3 Mounting Liquid Junction ................................................................... 2-2
2.1.4 Installing Holder ................................................................................. 2-2
2.1.5 Installing Associated Instruments ...................................................... 2-2
2.2 pH Sensor Cable Wiring Procedure................................................................ 2-3
2.2.1 Connecting Sensor Cable.................................................................. 2-3
2.2.2 Installing the sensor ........................................................................... 2-4
3. Maintenance on operation....................................................................... 3-1
3.1 Names of Component....................................................................................... 3-1
3.2 Operation and Periodic Maintenance ............................................................. 3-2
3.2.1 CalibratingpHSensorUsingBu󰀨erSolutions................................... 3-2
3.2.2 Replenishment of KCl Solution.......................................................... 3-2
3.2.3 Cleaning Glass Electrode and Liquid Junction.................................. 3-2
3.3 Replacing Consumable Parts.......................................................................... 3-2
3.3.1 Replacing Glass Electrode ................................................................ 3-2
3.3.2 Replacing Liquid Junction.................................................................. 3-2
3.3.3 Replacing O-rings for Glass Electrode .............................................. 3-3
Customer Maintenance Parts List...................................... CMPL 12B05J02-01E
Revision Information ...............................................................................................i

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  <1.Specication> 1-1
IM 12B7J2-01E
1. Specication
TheModelPH8EHPpHSensorisusedtocongureapurewaterpHtransmissionsystem.Whenthis
sensor is used in a PH8HH pure water holder, it is possible to measure a low conductive solution at
lowowrateaccurately.
1.1 StandardSpecications
Measurement principle: Glass electrode method
Measuring range: 0 to 14 pH
Installation: Mounting in PH8HH holder
Temperature compensation sensor : Pt1000
Wetted part materials:
Body; Ryton (PPS resin), glass, titanium, ceramics, Fluoro rubber (FKM)
Cable; Chlorinated polyethylene rubber (Cable sheath)
KCl solution supply tube: Heat-resistant soft PVC
Cable length: 3, 5, 7, 10, 15 or 20 m
Operating conditions:
Solution temperature: 0 to 50°C
Solution pressure: Under atmospheric pressure
Solutionowrate: 30to600mL/min
Note:Themaximumowrateisrestrictedbythemeasuredsolutionconductivity.
 Solutionconductivity: 0.1μS/cmormore(seefollowinggure)
600
500
400
300
200
100
00.1 0.2 0.3 0.4 0.5 0.6 50
Optimum range
(mL/min)
Conductivity of Measured Solution (μS/cm)
Flow Rate of Measured Solution
F1.0.ai
KCl solution consumption: Maximum 3 mL/day (10 kPa pressurized)
Weight:
Sensor; Approx. 0.4 kg (Body)
KCl Tank; Approx. 0.3 kg (General purpose)
Approx. 0.8 kg (Big volume)
Characteristics :
Output Response: Response time (for 90% response): 10 seconds maximum
(when the sensor, stabilized at 20°C, measures a solution at 20°C).
11th Edition : Nov.20,2018-00