YOKOGAWA DOX8HS User manual

User’s
Manual DOX8HS
Submersion Type Holder
IM 19H1D2-01E
IM 19H1D2-01E
5th Edition

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i
IM 19H1D2-01E
<INTRODUCTION>
INTRODUCTION
The DOX8HS submersion type holder is used to hold a sensor. This holder will keep the sensor
immersed in the solution at all times for continuous measurement regardless of major changes in
the level of the solution to be measured. The use of a submersion type holder with a jet washing
device enables automatic cleaning of the front end of the sensor at desired intervals by a water
jet or air jet without the need to remove the sensor.
To fully exploit the capabilities of this product, read through the user's manual before use.
Throughout this instruction manual important items with respect to handling are indicated by a
Warning or Caution designation, depending upon the relative degree of importance. For safety
reasons and to prevent the possibility of damaging the product, users should strictly observe
these items.
1.Verifyingspecications
The DOX8HS submersion type holder is made either of polypropylene or stainless steel.
The holder comes in di󰀨erent lengths and with or without a jet washing device.
Upon taking receipt of the product, unpack it carefully, checking that no damage has occurred
during transport. Check the parts list at the end of this manual to ensure that the received product
is exactly what was ordered and that no parts are missing.
Note: The DOX8HS submersion type holder is comprised of a style A (for the DO sigma series) and a style B (for EXA DO series and
the EXAss series).
Note that some of the parts for the two styles are not compatible. Whole assemblies can be used for both styles.
EXA DO, EXAss series: style B (sensor installation: 45° tilt)
DO sigma series: style A sensor installation: vertical)
2.Cautions
This instruction manual describes installation procedures, inspection, maintenance and other
handling procedures of the DOX8HS submersion type holder (style B).
For detailed information on sensor handling, refer to the user's manual of each sensor. User's
manuals for rerated equipment are listed below.
Other related items are described in the following manuals.
Model Title IM No.
DO402G Dissolved oxygen converter IM 12J05D02-01E
DO30G Dissolved oxygen sensor IM 12J5B3-01E
DO70G Optical dissolved oxygen sensor IM 12J05D04-01E
DO71 Optical dissolved oxygen sensor IM 12J06J01-00EN-P
DO72 Optical dissolved oxygen sensor IM 12J06J02-00EN-P
SS400G MLSS converter IM 12E6B1-02E
SS300G MLSS sensor IM 12E6C1-01E
SS350G Wiper-Washing controller IM 12E6E1-01E
Media No. IM 19H1D2-01E 5th Edition : Nov. 2022 (YK)
All Rights Reserved Copyright © 1998, Yokogawa Electric Corporation

ii
IM 19H1D2-01E
<INTRODUCTION>
 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:
n NotesonHandlingUser’sManuals
• Please hand over the user’s manuals to your end users so that they can keep the user’s
manuals on hand for convenient reference.
• Please read the information thoroughly before using the product.
• The purpose of these user’s manuals is not to warrant that the product is well suited to any
particular purpose but rather to describe the functional details of the product.
• No part of the user’s manuals may be transferred or reproduced without prior written
consent from YOKOGAWA.
• YOKOGAWA reserves the right to make improvements in the user’s manuals and product at
any time, without notice or obligation.
• 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 WarningandDisclaimer
The product is provided on an “as is” basis. YOKOGAWA shall have neither liability nor
responsibility to any person or entity with respect to any direct or indirect loss or damage arising
from using the product or any defect of the product that YOKOGAWA can not predict in advance.

iii
IM 19H1D2-01E
<INTRODUCTION>
n Symbol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.

iv
IM 19H1D2-01E
<INTRODUCTION>
 After-salesWarranty
n Donotmodifytheproduct.
n During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.
n Inthefollowingcases,customerwillbechargedrepairfeeregardlessof
warrantyperiod.
• Failure of components which are out of scope of warranty stated in instruction manual.
• Failure caused by usage of software, hardware or auxiliary equipment, which Yokogawa
Electric did not supply.
• 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.

v
IM 19H1D2-01E
<CONTENTS>
DOX8HS
Submersion Type Holder
CONTENTS
IM19H1D2-01E5thEdition
INTRODUCTION.............................................................................................i
 Forthesafeuseofthisequipment.............................................................ii
 After-salesWarranty ...................................................................................iv
1. Overview.................................................................................................... 1-1
1.1 FeaturesoftheDOX8HSSubmersionTypeHolder ...................................... 1-1
1.2 Specications.................................................................................................... 1-2
1.2.1 Standard Specications..................................................................... 1-2
1.2.2 Model and Su󰀩x codes...................................................................... 1-2
1.2.3 External Dimensions.......................................................................... 1-3
2. NamesandFunctions.............................................................................. 2-1
3. Installation,PipingandWiring................................................................ 3-1
3.1 InstallationprocedurefortheDO71sensortoDOX8HS .............................. 3-1
3.2 Preparationsforlnstallation ............................................................................ 3-2
3.2.1 Inserting the Sensor........................................................................... 3-2
3.2.2 Inserting the Mounting Bracket .......................................................... 3-3
3.3 Installation ......................................................................................................... 3-4
3.3.1 Selecting Measurement Point............................................................ 3-4
3.3.2 Selecting a Place of Installation for the DOX8HS Submersion
Type Holder........................................................................................ 3-4
3.3.3 Securing DOX8HS Submersion Type Holder.................................... 3-4
3.3.4 Installing DOX8HS Submersion Type Holder.................................... 3-4
3.4 PipingandWiring(forcleaning)...................................................................... 3-5
3.4.1 Items to Note with Regard to Piping Work......................................... 3-5
3.4.2 Piping Examples ................................................................................ 3-6
3.3.3 Wiring ................................................................................................. 3-7
4. Maintenance.............................................................................................. 4-1
4.1 InspectingSensorRetainingO-ring ............................................................... 4-1
4.2 InspectingtheCleaningDevice....................................................................... 4-2
4.2.1 Inspecting Jet Washing Device.......................................................... 4-2
4.2.2 Inspecting Solenoid Valve.................................................................. 4-2
CustomerMaintenancePartsList......................................CMPL19H01D02-01E
RevisionInformation ...............................................................................................i

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< 1. Overview > 1-1
IM 19H1D2-01E
1. Overview
1.1 FeaturesoftheDOX8HSSubmersionType
Holder
• Holds the sensor in place without being a󰀨ected by the conditions of the solution to be
measured
The sensor is steadily held at the measurement point no matter how fast the solution ows.
The material of the holder can be selected to suit the temperature of the solution to be
measured or corrosive substances it contains. Only the front end of the sensor is exposed to
the solution to minimize the likelihood of problems.
• Sensor is held at a tilt angle of 45° to allow stable measurements
Measurement results are less likely to be a󰀨ected by air bubbles enabling noise free
measurements in a wide range of processes.
• Sensor front end is automatically cleaned at regular intervals at the place at installation
Water jet or air jet cleaning substantially reduces dirt at the front end of the sensor.
This makes it possible to reduce the frequency of maintenance even in highly contaminated
solutions.
Sensor
Jet washing device
Washing utility pipe
Sensor cable
F07-1.ai
Optical dissolved
oxygen sensor
Jet washing device
Washing utility pipe
Sensor cable
Figure 1.1 SensorinDOX8HSSubmersionTypeHolder(withwashingdevice)

< 1. Overview >
1-2
IM 19H1D2-01E
1.2 Specications
1.2.1 StandardSpecications
Applicablesensors: Dissolved Oxygen Sensor DO30G, Optical Dissolved Oxygen Sensor
DO70G, DO71, DO72, and MLSS Sensor SS300G
Mounting: 2-inch pipe mounting vertical or horizontal, with 1 or 2 set of mounting
hardware.
    (Note) Makesurethemountingpipeisrmlyinstalled.
Cleaningmethod: Water or air jet cleaning (The wiper cleaning of MLSS meter should be
speciedonthesensor.)
Material:  Holder; Polypropylene or stainless steel equivalent to SUS316)
O-ring; Fluoro-rubber (Viton)
Mountingbracket: Stainless steel (equivalent to SUS316) or galvanized iron
Cleaning unit (wetted parts); Polypropylene
Weight: Holder; Approx. 0.5 to 3.6 kg (polypropylene), Approx. 1.5 to 11.5 kg
(stainless steel)
Mounting bracket; Approx. 1 kg/set
Measuringtemperature:0 to 80 °C
    (Note) Thetemperaturemaybelimitedbythespecicationsofthesensor.
Measuringowspeed:2 m/s or less.
    (Note) Theowratemaybelimitedbythespecicationsofthesensor.
Utilityrequiredforcleaningunit:
Utility Pressure(kPa) Flowrate
Water jet 100 to 200 5 to 20 l/min
Air jet 100 to 200 10 to 20 Nl/min
(Note1) Pressureandowratemustbesimultaneouslysatisedattheholderinletport.
(Note2) Alargebraid-reinforcedtubeofØ22xØ15isrecommendedforsupplyduetotheowrate.
1.2.2 ModelandSu󰀩xcodes
Model Su󰀩xCode
OptionCode
Description
DOX8HS ................................................. ................ Submersion type holder
Material -PP
-S3
................
................
Polypropylene
Stainless steel
Pipe length -10
-15
-20
-25
-30
-35
-40
................
................
................
................
................
................
................
1.0 m
1.5 m
2.0 m
2.5 m
3.0 m
3.5 m (stainless steel -S3 only)
4.0 m (stainless steel -S3 only)
Type -C
-L
................
................
For DO30G, SS300G
For DO70G, DO71, DO72
Cleaning Device (*1) -NN
-JT
................
................
No Cleaning
Forjetcleaning(Thesolenoidvalvemustbespeciedseparately.)(*3)
Connector for Cleaning -NN
-JP
-NP
................
................
................
No Cleaning
Rc1/2 (*3)
1/2NPT (*3)
Style Code *B ................... Style B
Option Mounting Bracket for Pipe (*2)
Adapter (*4)
/MS1
/MS2
/MS5
/MS6
/D71P
/D71S
/D72P
/D72S
Pipe mounting hardware: 1 set
Pipe mounting hardware: 2 sets
One mounting bracket (Stainless steel)
Two mounting brackets (Stainless steel)
Adapter for DO71 (-PP)
Adapter for DO71 (-S3)
Adapter for DO72 and DO70G (-PP)
Adapter for DO72 and DO70G (-S3)
*1: When using the wiper cleaning of MLSS meter, choose a proper cleaning system under the MS code of the MLSS sensor.