YOKOGAWA OR8EFG User manual

User’s
Manual
Model OR8EFG
KCl Filling type ORP Sensor
IM 12C07J01-01E
IM 12C07J01-01E
8th Edition

IM 12C07J01-01E
<INTRODUCTION> i
INTRODUCTION
This manual covers the OR8EFG KCl Filling type ORP 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
OR8TBG Terminal Box IM 12C04W01-01E
OR8AX Accessories for ORP Meter IM 12C04W02-01E
Media No. IM 12C07J01-01E 7th Edition : Feb. 2020 (YK)
All Rights Reserved Copyright © 1996, Yokogawa Electric Corporation
8th Edition : Apr. 27, 2020-00

IM 12C07J01-01E
<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.
8th Edition : Apr. 27, 2020-00

IM 12C07J01-01E
<INTRODUCTION> iii
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.
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IM 12C07J01-01E
<CONTENTS> v
Model OR8EFG
KCl Filling type ORP Sensor
CONTENTS
IM 12C07J01-01E 8th Edition
INTRODUCTION.............................................................................................i
For the safe use of this equipment.............................................................ii
After-sales Warranty ...................................................................................iii
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 Indicator Electrode............................................................. 2-1
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 ORP Sensor................................................ 2-2
2.2.1 In case of installing the PH8HG Guide-pipe Holder .......................... 2-2
2.2.2 Installing Sensor in PH8HS Submersion Holder ............................... 2-4
2.2.3 Installing Sensor in Flow-through Holder........................................... 2-7
2.3 ORP Sensor Cable Wiring Procedure............................................................. 2-9
2.3.1 Processing of Cable Inlet Hole........................................................... 2-9
2.3.2 Connecting Sensor Cable.................................................................. 2-9
2.3.3 Connecting Sensor Cable to Two-wire ORP Transmitter ................ 2-10
2.3.4 Connecting Sensor Cable to Four-wire ORP Converter ................. 2-11
3. Maintenance on operation....................................................................... 3-1
3.1 Operation and Periodic Maintenance ............................................................. 3-1
3.1.1 Calibrating ORP Sensor Using Checking Solutions.......................... 3-1
3.1.2 Pressurizing Reserve Tank ................................................................ 3-1
3.1.3 Replenishment of KCl Solution.......................................................... 3-2
3.1.4 Cleaning Indicator Electrode and Liquid Junction ............................. 3-3
3.2 Replacing Consumable Parts.......................................................................... 3-4
3.2.1 Replacing Liquid Junction.................................................................. 3-4
3.2.2 Replacing O-rings for Indicator Electrode.......................................... 3-4
Customer Maintenance Parts List....................................... CMPL12C03J01-01E
Revision Information ...............................................................................................i
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IM 12C07J01-01E
< 1. Specication >1-1
1. Specication
TheModelOR8EFGKClllingtypeORPSensorpermitsstableORP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 (a maximum depth of 3 meters).
1.1 StandardSpecications
Measurement: Oxidation-reduction potential of a solution
Measurement principle: Metallic electrode method
Measuring range: -1500 to 1500 mV
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 guide-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) PVC None 2 to 12 -5 to 50
PP -5 to 80
Submersion (PH8HS)
PP None
0 to 14
-5 to 100
Provided -5 to 80
SS (*2) None -5 to 100
Provided -5 to 80
Flow-through
(PH8HF) (*1)
PP None -5 to 80
Provided -5 to 80
SS (*2) None -5 to 105
Provided -5 to 80
Suspension (HH350G) SS (*2) None, Provided -5 to 80
Float (PB350G, PB360G) PP, SS (*2) None -5 to 50
Note: PVC: Rigid Polyvinyl, PP: Polypropylene, SS: Stainless Steel.
*1: 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).
*2: Solutions with normal pH ranges of 3 to 14 are recommended for stainless steel (316 SS).
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IM 12C07J01-01E
< 1. Specication >1-2
Solution pressure : Under atmospheric pressure to 10 kPa (General purpose)
(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: 3 m max.)
Guide-pipe Suspension Float Atmospheric pressure (Submersion depth: 3 m max.)
Flow-through (*1)
Atmospheric pressure to 10 kPa
Atmospheric pressure to 500 kPa
when medium pressure reserve tank used.
*1: Forow-throughtypes,referalsotothesolutiontemperatureandpressurediagramofHolderIM.
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).
Wetted part materials:
Body; Ryton (PPS resin), platinum-glass or gold-epoxy resin, titanium or Hastelloy C,
Ceramics or Fluororesin (PTFE), Fluoro rubber (FKM)
Cable; Chlorinated polyethylene rubber (Cable sheath)
KCl tube; Heat-resistant soft PVC (General purpose), Polyethylene (Medium pressure)
Weight:
Sensor; Approx. 0.4 kg (Body)
KCl Tank; Approx. 0.3 kg (General purpose)
Approx. 1 kg (Medium pressure)
KCl solution consumption: Pressurized with 10 kPa
3 mL/day (max.) (Junction for general use)
20 mL/day (max.) (PTFE junction)
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.
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< 1. Specication >1-3
1.2 ModelandSu󰀩xcodes
lORP Sensor
Model Su󰀩xCode Option Code Description
OR8EFG ......................................... ................... KCl Filling Type ORP Sensor
Electrode -AU
-PT
...................
...................
Gold
Platinum
Cable Length
and KCl Tube
Length
-03
-05
-07
-10
-15
-20
...................
...................
...................
...................
...................
...................
3 m
5 m
7 m
10 m
15 m
20 m
KCl Reserve Tank (*1) -TT1
-TT2
-TN1
-TN2
...................
...................
...................
...................
For general purpose (250 mL solution inlet)
For medium pressure (*2)
For maintenance (for TT1)
For maintenance (for TT2)
Measuring System -N
-E
-F
-B
-G
...................
...................
...................
...................
...................
For OR200,OR400 (*3)
For FLXA402,PH202,FLXA202,FLXA21 (*4)
For FLXA202,FLXA21 (*5)
For OR100 (*6)
For FLXA402, PH450G,PH202/TB (*7)
Style *A ................... Style A
Option Special junction /TF PTFE junction (*8)
*1: 2-inch pipe mounting bracket is supplied with TT1, TT2.
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 ORP Sensor, Regulator, (to be prepared separately)
Air Supply
To ORP 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.
*5: Mark band is shown by numeral and M4 ring terminals are used.
When terminal box is used, select WTB10-PH5.
*6: The tag which indicated the color, the sign, and the number is attached to the cable of a sensor.
*7: Mark band is shown by numeral and M3 ring terminals are used.
When terminal box is used, select WTB10-PH3.
*8: Choose when using in the heavily contaminated application.
lAccessories
Model Su󰀩xCode Option Code Description
OR8AX ..................... ...................... Accessories for ORP meter (*1)
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
One pack of quinhydrone reagent powder (three bags, 250 mL solution each)
One 250 mL polyethylene bottle
*2: Either /KCLL or /KCLP is required for OR8EFG-¨¨-¨¨-TT2.
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IM 12C07J01-01E
< 1. Specication >1-4
lConsumables
Part Name Part
Number Remarks
Indicator
electrode
Platinum K9142TS One for OR8ERG,OR8EFG
Gold K9142TT One for OR8ERG,OR8EFG
Junction K9142TH One for OR8ERG,OR8EFG
K9142HW One for OR8EFG/TF
KCl solution (3.3mol/L) K9084LP Six 250 mL polyethylene bottles
KCl powder (for OR8EFG) K9020XU 8 bags, each for preparation of 250mL
Reagent for
check
Quinhydrone K9024EC 3 bags, each for preparation of 250mL
Iron K9024ED 3 bags, each for preparation of 250mL
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IM 12C07J01-01E
< 1. Specication >1-5
1.3 External Dimensions
General purpose KCl reserve tank
(with mounting bracket)
(OR8EFG---TT1-*A)
Medium pressure KCl reserve tank
(with mounting bracket)
(OR8EFG---TT2-*A)
Terminal No. and colors
GE
RE
SE
G
15 (Red)
13 (Brown)
14 (Black)
16 (Green)
("-B", "-N": Fork terminal) ("-E": Pin terminal) ("-G", "-F": Ring terminal) Unit: mm
Pressure gauge Socket type connector
Rc1/4 screw
2-inch pipe
(O.D. : Ø60.5)
60
308
263
Coupling
with valve
88
Ø60.5
Model and codes L Weight (kg)
OR8EFG -  - 03 - TT- *A Approx. 3000 Approx. 0.4
OR8EFG -  - 05 - TT- *A Approx. 5000 Approx. 0.6
OR8EFG -  - 07 - TT- *A Approx. 7000 Approx. 0.7
OR8EFG -  - 10 - TT- *A Approx. 10000 Approx. 1.0
OR8EFG -  - 15 - TT- *A Approx. 15000 Approx. 1.4
OR8EFG -  - 20 - TT- *A Approx. 20000 Approx. 1.9
2-inch pipe
(O.D. : Ø60.5)
Tube length: L
Cable length: L
Ø38
Ø27.5
64
103
Cable gland is not included.
Reuse existing gland, or
replace.
Approx.
45
Approx.
115
Approx.
75
Ø63
F1.1.ai
15 13 14 16 15 13 14 16
GE RE SE G
Figure 1.1 OR8EFG Filling type ORP Sensor
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IM 12C07J01-01E
< 2. Installation >2-1
2. Installation
2.1 Preparation for Installation
2.1.1 UnpackingandInspection
The Model OR8EFG ORP 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.
NOTE
1. When delivered, the "indicator electrode" and the "liquid junction" are packed separate from
the sensor body.
2. So that the "liquid junction" does not dry out do not take unpack its at this time.
Made in Japan
No.
OR8EFG -
MODEL
F2.1.ai
PT- 03 -TT1-E＊A
Figure 2.1 An Example of Model Number Entering to Nameplate
F2.2.ai
Indicator Electrode
Liquid Junction
Grounding Electrode
Sensor Body
Figure 2.2 Names of OR8EFG ORP Sensor Components
2.1.2 Mounting Indicator Electrode
Mount the indicator electrode on the sensor body as per the following procedure:
(1) Peelo󰀨thesealcoveringtotheelectrodemountingholeonthesensorbody.
(2) Taketheindicatorelectrodeoutofitsbagandchecktoconrmthatthereisnodirtor
scratchesontheO-ringthatmighta󰀨ecttheseal.
(3) Mount the indicator electrode in the sensor body. Insert the electrode in the electrode
mountingholeandscrewtheelectrodeclockwiseuntiltheO-ringtstightlyinthehole.
NOTE
Becarefulnottoallowwaterdropletstoowintotheelectrodemountinghole.Ifwatergetsinto
thehole,wipeitdry,orinsulationresistancemaybea󰀨ected.
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IM 12C07J01-01E
< 2. Installation >2-2
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ORP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 ORP transmitter/converter or a junction terminal
box) to which the ORP Sensor cable is connected has already been installed.
2.2 Requirements for mounting the ORP 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 OR8EFG ORP Sensor. Attach the holding hardware to
the pipe (2-inch). 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
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IM 12C07J01-01E
< 2. Installation >2-3
(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 ORP 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 ORP variations of the measured solution. This may cause problems for ORP
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.
Sensor Cable
Sensor Cable
ORP 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
8th Edition : Apr. 27, 2020-00

IM 12C07J01-01E
< 2. Installation >2-4
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)
8th Edition : Apr. 27, 2020-00

IM 12C07J01-01E
< 2. Installation >2-5
F2.7.ai
Clamp (Screw)
Cleaner Holder
Sensor Holder
Figure 2.7 Removal of Sensor Holder (with Cleaner)
 Toinstallthesensorcableinthesensorholder,rstremovetheprotectorscrewedontothe
sensor holder end and then remove the protective foam piece (for shipping; thus, it is not
necessary after the sensor is installed in the holder). Pass the sensor cable through the
O-ringthenattachtheO-ringtothesensorange(seeFigure2.7).
When passing the sensor cable through the holder, if the inside of the holder is dirty or wet,
take special care to keep the cable dry by covering the sensor cable end with a polyethylene
bag or the like.
For details to install the sensor onto a holder, refer to relevant IMs.
Waterproof Cap Cover
Waterproof Cap
Sensor Holder Pipe
Sensor Cable
Pull out the sensor cable
and KCl solution supply tube.
Sensor Body
O-ring
Flange
Protector
Sponge
(Remove)
Insert the sensor and cable
and KCl solution supply tube.
KCl solution supply tube
Figure 2.8 Installing the Sensor Cable
8th Edition : Apr. 27, 2020-00

IM 12C07J01-01E
< 2. Installation >2-6
(2) Connect the sensor cable to the associated instrument correctly by referring to Section 2.3.
(3) Mounttheliquidjunctioninthesensorbody.Peelo󰀨thesealattachedtotheliquidjunction
mounting hole on the sensor body. Screw the liquid junction gently two or three turns into the
hole.
(4) Ifspecied,areservetankcontaining250mLKClsolutionandmountinghardwaretohold
this tank are supplied with the OR8EFG ORP Sensor. Attach the mounting hardware to
the pipe (2-inch). 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.
(5) Supply KCl solution to the sensor. 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 in its top (see Figure 2.3). Stand the sensor upside down at a position
lower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.
(6) Screwtheprotectortoxthesensortotheholder.Inthiscase,removetheprotectivecap
andsecuretheprotectorsothattheangeofthesensorcompressestheO-ringrmly.
about the installation method.
F2.9.ai
Protector
O-ring
ORP Sensor
Figure 2.9 Installing Sensor in Submersion Holder
(7) Closethewaterproofcap,andattachtheholdertothearmpipe,angeorcleanerholder
completely.
8th Edition : Apr. 27, 2020-00

IM 12C07J01-01E
< 2. Installation >2-7
2.2.3 Installing Sensor in Flow-through Holder
Toinstallthesensorinaow-throughholder,proceedasfollows:
(1) Connectthesensorcabletotheassociatedinstrument.First,removethesensorxingnut
and pass the sensor cable through the nut.
ORP Sensor
Sensor Fixing Nut
Figure 2.10 Preparation for Sensor Cable Connection
Properly connect the sensor cable by referring to Section 2.3.
(2) Mounttheliquidjunctiononthesensorbody.Peelo󰀨thesealcoveringtheliquidjunction
mounting hole in the sensor body. Screw the liquid junction softly into the hole by turning it
for two or three turns.
(3) Ifspecied,areservetankcontaining250mLsolutionandmountinghardwaretoholdthis
tank, or a medium pressure reserve tank are supplied with the OR8EFG ORP Sensor.
Attach the mounting hardware for general purpose reserve tank to a pipe (2-inch). Connect
the general purpose 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.
When using a medium pressure reserve tank, attach it to a pipe (2-inch) and perform air
piping to supply pressure for reserve tank as shown in Figure 2.11. Connect the KCl supply
tube of the sensor to this reserve tank.
Air Pressure
Regulator
Air Supply
Pressure Gauge
To ORP Sensor
Maximum Measured Solution
Pressure +10 kPa
Figure2.11 AirPipingforPressurizingMediumPressureReserveTank
(4) Supply KCl solution to the sensor.
8th Edition : Apr. 27, 2020-00