YOKOGAWA PH8EFP User manual

User’s
Manual
Model PH8EFP
KCl Filling type pH Sensor
IM 12B7J1-01E
IM 12B7J1-01E
12th Edition

IM 12B7J1-01E
< Introduction > i
INTRODUCTION
This manual covers the PH8EFP KCl Filling type pH Sensor.
Other related items are described in the following manuals.
Model Title IM No.
PH8HG Guide-pipe Holder IM 12B7M2-01E
PH8HF, PH8HFF Flow-Through Type Holder IM 12B07N01-01E
PH8HS, PH8HSF Submersion Type Holder IM 12B07M01-01E
HH350G Well Bucket Type Holder IM 19H1B1-01E
PB350G Float Type Holder IM 19H1E1-01E
PB360G Vertical Type Float Holder IM 19H1E2-01E
FLXA402 4-Wire Converter IM 12A01F01-02EN
IM 12A01F02-01EN etc.
PH450G pH/ORP Converter IM 12B07C05-01E
PH202G, S pH/ORP Transmitter IM 12B07D02-01E
PH202SJ TIIS Intrinsic safe pH/ORP Transmitter IM 12B07D02-11E
FLXA202, FLXA21 2-Wire Liquid Analyzer IM 12A01A02-01E
WTB10-PH¨Terminal Box IM 19D01B01-01E
PH8TBG Terminal Box IM 12B07W01-01E
PH8AX Accessories for pH Meter IM 12B07W03-01E
SA11 SA11 Smart Adapter IM 1206S01-00EN-(P)
IM 1206S01-01Z1-(P)
nTrademark Acknowledgments
• FLEXA, FLXA, SENCOM and FieldMate are trademarks or registered trademarks 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.
Media No. IM 12B7J1-01E 12th Edition : Dec. 2018 (YK)
All Rights Reserved Copyright © 1996, Yokogawa Electric Corporation
12th Edition : Dec.14,2018-00

IM 12B7J1-01E
< Introduction > ii
For the safe use of this equipment
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.
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, of injury, electric shock, or fatalities. 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.
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.
12th Edition : Dec. 14,2018-00

IM 12B7J1-01E
< Introduction > iii
nCompliance with the simple apparatus requirements
PH8EFP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
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 PH8EFP
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 81 31 95 (*1) 43
T4 105 66 105 78
T3 105 105 105 105
T2 105 105 105 105
T1 105 105 105 105
*1: Care about upper limit 100°C of temperature class T5 should be taken.
12th Edition : Dec. 14,2018-00

IM 12B7J1-01E
< Introduction > iv
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) With sensors that have a solution ground tip made of titanium (-TN), 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.
12th Edition : Dec. 14,2018-00

IM 12B7J1-01E
< 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.
• 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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.
12th Edition : Dec. 14,2018-00

Blank Page

IM 12B7J1-01E
< CONTENTS > vii
12th Edition : Dec.14,2018-00
Model PH8EFP
KCl Filling type pH Sensor
CONTENTS
IM 12B7J1-01E 12th 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.................................................................................... 1-3
1.3 External Dimensions ........................................................................................ 1-5
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 Requirements for mounting the pH sensor ................................................... 2-3
2.2.1 In case of installing the PH8HG Guide-pipe Holder .......................... 2-3
2.2.2 Installing Sensor in PH8HS Submersion Holder ............................... 2-5
2.2.3 Installing Sensor in Flow-through Holder........................................... 2-8
2.3 pH Sensor Cable Wiring Procedure.............................................................. 2-11
2.3.1 Processing of Cable Inlet Hole......................................................... 2-11
2.3.2 Connecting Sensor Cable................................................................ 2-11
2.3.3 Connecting Sensor Cable to FLXA202/FLXA21 ............................. 2-12
2.3.4 Connecting Sensor Cable to Two-wire pH Transmitter ................... 2-12
2.3.5 Connecting Sensor Cable to FLXA402 ........................................... 2-13
3. Maintenance on operation....................................................................... 3-1
3.1 Operation and Periodic Maintenance ............................................................. 3-1
3.1.1 CalibratingpHSensorUsingBu󰀨erSolutions................................... 3-1
3.1.2 Pressurizing Reserve Tank ................................................................ 3-1
3.1.3 Replenishment of KCl Solution.......................................................... 3-1
3.1.4 Cleaning Glass Electrode and Liquid Junction.................................. 3-2
3.2 Replacing Consumable Parts.......................................................................... 3-3
3.2.1 Replacing Glass Electrode ................................................................ 3-3
3.2.2 Replacing Liquid Junction.................................................................. 3-3

IM 12B7J1-01E
< CONTENTS > viii
12th Edition : Dec.14,2018-00
3.2.3 Replacing O-rings for Glass Electrode .............................................. 3-3
Customer Maintenance Parts List...................................... CMPL 12B05J01-02E
Customer Maintenance Parts List...................................... CMPL 12B05J01-02E
Revision Information ...............................................................................................i

IM 12B7J1-01E
  <1.Specication> 1-1
1. Specication
TheModelPH8EFPKClllingtypepHSensorpermitsstablepHmeasurementevenfor
solutions having comparatively severe properties.
ThissensorcanbemountedoneitheranPH8HFow-throughholderoranPH8HSsubmersion
holder, or its can be used alone suspended in the solution (maximum depth 3 meters) depending
onthespecication.
1.1 StandardSpecications
Measurement: Hydrogen ion concentration (pH) of a solution
Measurement principle: Glass electrode method
Measuring range: 0 to 14 pH (see Table 1)
Installation: Mounting in PH8HS submersion holder
Mounting in PH8HG guide-pipe holder
   MountinginPH8HFow-throughholder
Note: Ifanyofthefollowingsolutionsaremeasured,installthesensoreitherinaow-throughorsubmersionholder.
• When the solution temperature exceeds 80°C.
• When the pH of the solution is 2 or less or 12 or greater.
• When a strong acid solution is to be measured
(e.g., aqua regia, chromic acid, hypochlorous acid or perchloric acid, etc.).
• When the solution contains corrosive gases
 (e.g.,ammonia,chlorine,hydrogensulde,etc).
• When the solution contains a small percentage of organic solvent or oil.
Solution temperature: -5 to 105°C
when mounted in PH8HG guid-pipe holder: -5 to 80°C
when mounted in PH8HS, PH8HF holder, see Table 1.
Table 1. Process Temperature Range
Holder Type Holder Material Cleaner Solution
pH Range
Solution
Temperature
(°C)
Guide-pipe
(PH8HG) (*4)
PVC None 2 to 12 -5 to 50
PP (*3) None -5 to 80
Submersion
(PH8HS)
PP (*2) )*3) None 0 to 14 -5 to 100
SS (*1) Provided -5 to 80
Flow-through
(PH8HF) (*2)
PP None,Provided -5 to 80
SS (*1) None -5 to 105
Provided -5 to 80
Suspension
(HH350G) (*4)
SS (*1) None,Provided -5 to 80
Float
(PB350G,PB360G)
(*4)
PP
SS (*1)
None -5 to 50
Note: PVC: Rigid Polyvinyl, PP: Polypropylene, SS: Stainless Steel:
*1 Stainless steel holder and Stainless steel adapter should be used when the pH value of the solution is pH3 or more acidic.
*2: Forow-throughtypes,referalsotothesolutiontemperatureandpressuregraph
 (innotesfollowingModelandSu󰀩xcodetableforow-throughtypeholders).
*3: The temperature of chemical cleaning is 0 to 50 °C.
*4: Cannot be used with pH sensors connected to Variopin connecter.
12th Edition : Dec.14,2018-00

IM 12B7J1-01E
  <1.Specication> 1-2
Temperature compensation sensor: Pt1000
Solution pressure: Under atmospheric pressure to 10 kPa
(General purpose or big volume tank 500 mL) (See Table 2 when using holder)
Atmospheric pressure to 500 kPa
(Medium pressure tank) (See Table 2 when using holder)
Table 2. Process Pressure Range
Holder Process Pressure Range
Submersion Atmospheric pressure (Submersion depth: Max. 3 m)
Guide-pipe
Suspension
Float
Atmospheric pressure
(Submersion depth: Max.3 m)
Flow-through (*1) Atmospheric pressure to 10 kPa (*2)
Atmospheric pressure to 500 kPa (*3)
*1: Forow-throughtypes,referalsotothesolutiontemperatureandpressurediagramofHolderIM.
*2: When general purpose reserve tank used.
*3: When medium-pressure reserve tank used.
Operating solution depth: 3 m water pressure (max.) under atmospheric pressure
Solutionowvelocity:  2m/smax.
Solutionowrate:  3to11L/min
    (whenthesensorisinstalledinaow-throughtypeholder).
Solution conductivity: 50 µS/cm or higher
Wetted part materials:
Body; Ryton (PPS resin), Glass, Titanium or Hastelloy C, Ceramics or Fluoropolymer (PTFE),
  Fluororubber(FKM)rubberorPeruoroelastomer(FFKM)
Cable; Chlorinated polyethylene rubber (Cable sheath)
KCl solution supply tube: Heat-resistant soft PVC (General purpose or big volume tank
500 mL), Polyethylene (Medium pressure).
Weight:
Sensor; Approx. 0.4 kg
KCl Tank; Approx. 0.3 kg (General purpose)
Approx. 1 kg (Medium pressure)
Approx. 0.8 kg (Big volume)
KCl solution consumption: when pressurized with 10 kPa
Maximum 3 mL/day (general junction)
Maximum 20 mL/day (PTFE junction)
Output Response:
Response time (for 90% response); 10 seconds maximum
(when the sensor, stabilized at 20°C, measures a solution at 20°C).
CAUTION
Select the material of wetted parts with careful consideration of process characteristics. Inappropriate
selection may cause leakage of process fluids, which greatly affects facilities. Considerable care must be
taken particularly in the case of strongly corrosive process fluid such as hydrochloric acid, sulfuric acid,
hydrogen sulfide, and sodium hypochlorite. If you have any questions about the wetted part construction
of the product, be sure to contact Yokogawa.
12th Edition : Dec.14,2018-00

IM 12B7J1-01E
  <1.Specication> 1-3
1.2 ModelandSu󰀩xcodes
lpH Sensor
Model Su󰀩xCode Option
Code Description
PH8EFP ......................................... ................... KCl Filling Type pH Sensor
Cable Length
and KCl Tube
Length
-03
-05
-07
-10
-15
-20
-V3
-V5
-V7
-VA
-VB
-VC
...................
...................
...................
...................
...................
...................
...................
...................
...................
...................
...................
...................
3 m
5 m
7 m
10 m
15 m
20 m
For Variopin connector 3m (*11)
For Variopin connector 5m (*11)
For Variopin connector 7m (*11)
For Variopin connector 10m (*11)
For Variopin connector 15m (*11)
For Variopin connector 20m (*11)
Solution
Ground Tip
-TN
-HC
...................
...................
Titanium
Hastelloy C
KCl Reserve Tank
(*1)
-TT1
-TT2
-TT3
-TN1
-TN2
...................
...................
...................
...................
...................
For general purpose (250mL solution inlet)
For medium pressure (*2)
Big volume tank (With 500 mL tank)
For maintenance (for TT1, TT3)
For maintenance (for TT2)
- -N ................... Always -N
pH Measuring System -T
-E
-F
-B
-G
-V
...................
...................
...................
...................
...................
...................
For PH200/PH400 (*3)
For PH202/FLXA202/FLXA21 (*4)
For FLXA202/FLXA21 (*10)
For PH100 (*5)
For FLXA402, PH450G,PH202/TB (*9)
Variopin connector (*12)
Style *A ................... Style A
Option O-ring
Special glass electrode
Special junction
/PF
/HA
/TF
Peruoroelastomer(FFKM)(*6)
Glass electrode for high alkali (*7)
PTFE junction (*8)
*1: 2-inch pipe mounting bracket is supplied with TT1, TT2 and TT3.
Only a supply tube, but no KCl solution, is supplied with TN1 and TN2.
Since a KCl solution is not supplied with TT2, arrange it from among accessories or auxiliary parts.
*2: Prepare an air pressure regulator as shown in the diagram below when the medium-pressure reserve tank is used.
To pH sensor, Regulator, (to be prepared separately)
Air Supply
To pH sensor
Regulator
(to be prepared separately)
*3: Mark band is shown by alphanumeric and fork terminals are used.
*4: Mark band is shown by numeral and pin terminals are used. When terminal box is used, select WTB10-PH1.
*5: The tag which indicated the color, the sign, and the number is attached to the cable of a sensor.
*6: ChoosePeruoroelastomer(FFKM)whenthisisusedinorganicsolvent,hightemperaturealkalinesolution.
*7: Choose when using in high alkali or high temperature alkaline solution.
*8: Choose when using in the heavily contaminated application.
*9: Mark band is shown by numeral and M3 ring terminals are used. When terminal box is used, select WTB10-PH3.
*10: Mark band is shown by numeral and M4 ring terminals are used.
When terminal box is used, select WTB10-PH5.
*11: Select -V for a measuring system.
*12: Option/K(withmeasurementlowcerticate)cannotbespecied.Donotallowthepartabovethesensorangetocontactwith
the solution.
12th Edition : Dec.14,2018-00

IM 12B7J1-01E
  <1.Specication> 1-4
lAccessories
Model Su󰀩x
Code
Option
Code Description
PH8AX .................. ................. Accessories for pH meter (*1)
Calibration
Reagents
-L
-P
.................
.................
Two bottles, each containing 250 mL solution (pH7 and pH4)
24 bags, each bag containing powder for 500mL solution (pH7 X
12 bags and pH4 X 12 bags) and two 500mL polyethylene bottles.
Style *A ................. Style A
Option (*2) /STD
/KCLL
/KCLP
/TMP
Sensor stand (with mounting bracket for 2-inch pipe)
KCl solution (one 250 mL polyethylene bottle)
KCl powder (three bags, 250 mL solution each)
Thermometer (0 to 100 °C)
*1: Including the following:
Two 200 mL polyethylene cups
One cleaning bottle
*2: Either /KCLL or /KCLP is required for PH8EFP-¨¨-¨¨-TT2.
lConsumables
Part Name Part
Number Remarks
Glass electrode
General purpose K9142TN One
K9319NA One for /PF option
Certiedversion K9142TP One for /K option
K9319NB One for /K, /PF option
High alkali K9142TU One for /HA option
K9319NC One for /HA, /PF option
Junction
General purpose K9142TH One
K9319QA One for /PF option
Fluoropolymer
(PTFE)
K9142HW One for /TF option
K9319QB One for /TF, /PF option
KCl solution (3.3mol/L) K9084LP Six 250 mL polyethylene bottles
Bu󰀨ersolutionforcalibration(pH4) K9084LL Six 250 mL polyethylene bottles
Bu󰀨ersolutionforcalibration(pH7) K9084LM Six 250 mL polyethylene bottles
Bu󰀨ersolutionforcalibration(pH9) K9084LN Six 250 mL polyethylene bottles
Powderforbu󰀨ersolution(pH4) K9020XA 12 bags, each for preparation of 500 mL
Powderforbu󰀨ersolution(pH7) K9020XB 12 bags, each for preparation of 500 mL
Powderforbu󰀨ersolution(pH9) K9020XC 12 bags, each for preparation of 500 mL
Note: ThepHvalueofthecalibratingbu󰀨ersolutionmayvarydependingonstorageconditions.
Prepare a new solution from powder for accurate instrument calibration.
12th Edition : Dec.14,2018-00

IM 12B7J1-01E
  <1.Specication> 1-5
1.3 External Dimensions
Variopin connecter
(PH8EFP-V�-��-T��-N-V*A)
64
293
103
Ø27.5
Ø38
Fork terminal (-T, -B)
For PH200, PH400
(PH8EFP-��-��-TT�-N-T*A)
For PH100
(PH8EFP-��-��-TT�-N-B*A)
Ø38
Ø27.5
103 64
(Standard: 3m, 5m,
7m, 15m, 20m)
(Standard: 3m, 5m,
7m, 15m, 20m)
Tube length Tube length
For FLXA202, FLXA21
(PH8EFP-��-��-TT�-N-E*A)
Cable length (Standard: 3m, 5m, 7m, 15m, 20m)
Ring terminal(-F, -G)
Pin terminal (-E)
Sensor cable
Connector for KCl reserve tank
KCl solution tube KCl solution tube
For FLXA202, FLXA21
(PH8EFP-��-��-TT�-�-F*A)
For FLXA402, PH450, PH202/TB
(PH8EFP-��-��-TT�-N-G*A)
Unit: mm
Figure 1.1 PH8EFP Filling type pH Sensor
12th Edition : Dec.14,2018-00

IM 12B7J1-01E
  <1.Specication> 1-6
Weight : Approx. 0.3 kg
General Purpose KCl Reserve Tank
(PH8EFP - □□ - □□ - TT1 - □ -□ *A)
General Purpose KCl Reserve Tank (500 mL)
(PH8EFP - □□ - □□ - TT3 - □ -□ *A)
(PH8EFP - □□ - □□ - TT2 - □ -□ *A)
Midium Pressure KCl Reserve Tank
Weight : Approx. 1 kg
Holes Dimension for Wall Mounting
Weight : Approx. 0.8 kg
JIS 50A pipe
(O.D.: ø60.5)
Socket type connector
Rc1/4 screw
Pressure gauge
JIS 50A pipe
(O.D.: ø60.5)
68
308 263
88
ø60.5
Approx. 105
Approx.
151
60
25
60
JIS 50A pipe
2-ø9 holes (or M8 screws)
70±0.2
ø105
(O.D.: ø60.5)
ø63
Approx.
151
Approx.
75
Approx.
45

IM 12B7J1-01E
< 2. Installation > 2-1
2. Installation
2.1 Preparation for Installation
2.1.1 Unpacking and Inspection
The Model PH8EFP pH sensor is well packed so as to prevent damage during shipment.
After removing the sensor from its shipping container, visually check the sensor for damage.
Check also the order was delivered correctly by identifying the information on the nameplate
attached on the sensor body.
NOTE
1. When delivered, the "glass electrode" and the "liquid junction" are packed separate from the
sensor body.
2. At this time, DO NOT take away the caps of the “glass electrode” or pull “glass liquid
junction” out of the package yet to prevent them from being dried.
Made in Japan
No.
PH8EFP -
MODEL
F2.1.ai
03-TN-TT1-N-T*A
Figure 2.1 An Example of Model Number Entering to Nameplate
F2.2.ai
Glass Electrode
Liquid Junction
Solution Ground tip
Sensor Body
Figure 2.2 Names of PH8EFP pH Sensor Components
12th Edition : Dec.14,2018-00

IM 12B7J1-01E
< 2. Installation > 2-2
2.1.2 Mounting Glass Electrode
Mount the glass electrode on the sensor body as per the following procedure:
(1) Peelo󰀨thesealfromtheelectrodemountingholeonthesensorbody.
(2) Removethecapfortheglassmembrane.Wipeo󰀨anysolutionremainingontheO-ringwith
a tissue or other material.
(3) Remove the cap for the gold-plated pin.
(4) ConrmthatthereisnodamageontheO-ringthatmighta󰀨ectitssealingperformance.
(5) Mount the glass electrode on the sensor body. Insert the electrode in the mounting hole and
screwitclockwiseuntiltheO-ringtstightlyinthehole.
NOTE
• As shown in Figure (a), the cap for the glass membrane contains the solution to keep wet
(pH4bu󰀨ersolution).Donotsplashthesolutionwhenremovingthecap.Removethecap
carefully because the rod beside the glass membrane is very fragile.
• Before mounting the glass electrode on the sensor body, make sure that the O-ring and the
gold-platedpinarenotwet.Wipeo󰀨anyremainingsolution.
• Makesurethattherearenodropletsinthemountinghole.Wipeo󰀨anydroplets,orthey
may cause insulation failure.
• Use the electrode within one year after purchase. The solution to keep wet gradually
evaporates over time. A glass electrode whose glass membrane has dried out does not
provide stable readings until it gets used to the solution. As shown in Figure (b), place in
advancetheglasselectrodeeitherinthepH4orpH7bu󰀨ersolutionformorethanaday
before using.
Make sure the part above the O-ring is not wetted.
Case part No.: K9008WT
Cap for the gold-plated pin
Cap for the glass membrane
Solution to keep wet (inside)
(a) (b)
2.1.3 Mounting Liquid Junction
The liquid junction is mounted in the sensor body when the KCl solution is poured into the sensor
body. Refer to Section 2.2.
2.1.4 Installing Holder
Usually,thepHsensorissuspendedinaguidepipeorinstalledinaow-throughorsubmersion
holder. First install the holder.
2.1.5 Installing Associated Instruments
Make sure that the associated instrument (a pH transmitter/converter or a junction terminal box)
to which the pH sensor cable is connected has already been installed.
12th Edition : Dec.14,2018-00

IM 12B7J1-01E
< 2. Installation > 2-3
2.2 Requirements for mounting the pH sensor
2.2.1 In case of installing the PH8HG Guide-pipe Holder
To install the sensor in the guide pipe, proceed as follows:
(1) Connect the sensor cable to the associated instrument correctly by referring to Section 2.3
provided later.
(2) Mounttheliquidjunctioninthesensorbody.Peelo󰀨thesealattachedtotheliquidjunction
mounting hole in the sensor body. Screw the liquid junction gently two or three turns into the
hole.
(3) Ifspecied,areservetankcontaining250mLKClsolutionandmountinghardwaretohold
this tank are supplied with the PH8EFP pH sensor. Attach the holding hardware to the pipe
(nominal diameter 50 mm). Connect the reserve tank to the KCl solution supply tube of the
sensor. Remove the cap from the tank and screw the tube connector securely into the tank.
(4) Supply KCl solution to the sensor (see Figure 2.3). First, mount the reserve tank on the
mounting hardware with the tube connection part directed downwards. Using the pin
supplied with the tank, make several holes it its top (see Figure 2.3). Stand the sensor
upside down at a lower position than the reserve tank as shown in Figure 2.3 so that KCl
solutionowsfromthetankintothesensor.WhentheKClsolutionllsthesensorand
overowsfromtheliquidjunctionmountinghole,securelyscrewtheliquidjunctionintothe
mounting hole.
F2.3.ai
KCl Solution Tube
General Purpose
Reserve Tank
Sensor Body
Liquid Junction (Loose)
Leave air space in the tank.
(Make several holes using the
pin supplied with the tank)
Figure 2.3 Supplying KCl Solution to Sensor Body
For the Big-volume reserve tank, refer to page 2-9 to 2-10.
(5) Attach the "stopper" supplied with the guide pipe to the sensor cable.
Fix the sensor cable so that the sensor tip projects 20 to 30 mm out from the pipe end when
the pH sensor is suspended in the guide pipe as shown in Figure 2.4.
NOTE
If the sensor tip does not project out from the pipe end, the measured value may not respond
promptly to the pH variations of the measured solution. This may cause problems for pH
measurement and control. On the other hand, if the sensor tip projects too far from the pipe end,
the force on the sensor may damage the sensor cable from scraping it against the pipe.
12th Edition : Dec.14,2018-00

IM 12B7J1-01E
< 2. Installation > 2-4
Sensor Cable
Sensor Cable
pH Sensor
Arm Pipe
Guide Pipe
Cable Clamp
Attaching "Stopper"
Stopper
20 to 30 mm
2-inch (60.5 mm O.D)
Mounting Pipe
Figure 2.4 Mounting Sensor in Guide Pipe
12th Edition : Dec.14,2018-00

IM 12B7J1-01E
< 2. Installation > 2-5
2.2.2 Installing Sensor in PH8HS Submersion Holder
To install the sensor in the submersion holder, proceed as follows:
(1) Pass the sensor cable through the sensor holder. If the submersion holder remains installed,
remove the sensor holder in any case.
For a pipe-mounting submersion holder without a cleaner, loosen the sensor holder nut to
remove the holder.
F2.5.ai
Right-angled Pipe Clamp
Sensor Holder
Nut
Sensor Holder
Sensor Holder Nut
Arm Pipe
Removal of Sensor Holder (Arm Pipe used with option /MS1 or /MS2)
Removal of Sensor Holder (Stainless Bracket used with option /MS3 or /MS4)
Bracket
Figure 2.5 Removal of Sensor Holder (for Pipe Mounting Sensor without Cleaner)
 Foraangemountingsubmersionholderwithoutacleaner,removethesensorholderby
looseningthetwoboltssecuringthesensorholdertotheange(seeFigure2.6).
F2.6.ai
Flange
Fixing Bolt
Figure 2.6 Removal of Sensor Holder (for Flange Mounting Sensor without Cleaners)
12th Edition : Dec.14,2018-00