Yokogawa DO30G User Manual

User’s Manual

Dissolved Oxygen Metering System Model DO30G Dissolved Oxygen Sensor

IM 12J5B3-01E

4th Edition

Introduction

The DO30G Dissolved Oxygen Sensor bases its principle of measurement on the galvanic-cell

method. The sensor is specically suited for continuous measurement of oxygen dissolved in

water.

Topics and information that need your special attention in handling the product are given in the text of this manual along with cautionary notes, such as a warning or caution, depending on their importance. Strictly observe these items from the standpoint of safety and prevention of equipment damage. For a notation, such as a warning also indicated on the product, there is an alert mark in the manual.

1. Conrming the Specications

The standard specication DO30G dissolved oxygen sensor is used to build the dissolved oxy-

gen metering system.

The DO30G sensor cable has the prescribed length. The conguration of the crimp-on terminals

are either pin-type, M4 ring-type or fork-type.

Upon arrival of the purchased product, carefully unpack it and make sure the product is completely free from any damage that may have occurred during transport. Also check the model code indicated on the nameplate attached to the sensor cable to make sure that you received the correct sensor. For the meaning of the model code, refer to subsection 1.2.2 on page 1-3.

Note: The model and sufx code of the sensor with standard specications is as follows.

DO30G-NN-50-

- ( : User specied alphanumeric)

2. Information Covered by This Manual

This manual covers all of the information on handling the DO30G Dissolved Oxygen Sensor

(Style B), such as instructions on installation, inspection, and maintenance and service.

Note : When system components other than DO30G have to be mentioned, descriptions of the basic system assumes that the

DO402G Dissolved Oxygen Converter is used.

Refer to the instruction manual for information on the converter connecting holders with the DO30G and how to connect sensor cables.

Note that the instruction manuals listed in the following table are for the associated equipment used with the EXA

Manuals for Associated Equipment Used with the EXA DO Dissolved Oxygen Metering Syatem

Model Title of Manual Manual No.

DO402G Dissolved Oxygen Converter IM 12J05D02-01E

DO202

FLXA21 2-wire Liquid Analyzer IM 12A01A02-01E

DO30G Dissolvecl Oxygen Sensor IM 12J5B3-01E

PH8HG Guide Pipe IM 12B7M2-01E

PB350G Angled Floating Ball Holder IM 19H1E1-01E

DOX8HS Immersion Type Holder (Style B) IM 19H1D2-01E

PH8PU1 Cleaning Pump/Tank IM 19C1E1-01E

WTB10-DO

Note: Only the basic system of basic components are listed on the front panel.

Refer to respective instruction manual for information on recorders, annunciators and other instruments.

DO Dissolved Oxygen Metering System.

2-wire Dissolved Oxygen Transmitter

Relay Terminal Box IM 12J05W02-01E

IM 12J05C01-01E

IM 12J5B3-01E

4th Edition : Apr 05,2011

u For the safe use of this equipment

CAUTION

WARNING

IMPORTANT

(1) About This Manual

• This manual should be passed on the end user.

• The contents of this manual are subject to change without prior notice.

• The contents of this manual shall not be reproduced or copied, in part or in whole, without permission.

• This manual explains the functions contained in this product, but does not warrant that they are suitable for the particular purpose of the user.

• Every effort has been made to ensure accuracy in the preparation of this manual. However,

when you realize mistaken expressions or omissions, please contact the nearest Yokogawa representative or sales ofce.

• This manual does not cover the special specications. This manual may be left unchanged on any change of specication, construction or parts when the change does not affect the

functions or performance of the product.

• If the product is not used in a manner specied in this manual, the safety of this product may

be impaired.

(2) SafetyandModicationPrecautions

• Follow the safety precautions in this manual when using the product to ensure protection and safety of the human body, the product and the system containing the product.

(3) The following safety symbols are used on the product as well as in this manual.

The following safety symbols are used in this manual.

Identies instructions that must be observed in order to avoid physical injury and electric

shock or death of the operator.

Identies instructions that must be observed in order to prevent the software or hardware

from being damaged or the system from becoming faulty.

Identies important information required to understand operations or functions.

TIP

SEE

ALSO

Identies additional information.

Identies a source to be referred to.

IM 12J5B3-01E

4th Edition : Apr 05,2011

u After-sales Warranty

l Do not modify the product.

During 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.

l 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.

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 did

not supply.

iii

• Failure due to improper or insufcient maintenance by user.

• Failure due to abuse, misuse or modication 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.

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.

Yokogawa will not bear responsibility when user congures the product into systems or resells

the product.

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.

IM 12J5B3-01E 4th Edition : Apr 05,2011

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Dissolved Oxygen Metering System Model DO30G Dissolved Oxygen Sensor

IM12J5B3-01E4thEdition

CONTENTS

Introduction ..............................................................................................................i

u For the safe use of this equipment

u After-sales Warranty

.........................................................................................iii

...................................................................ii

1. General ...................................................................................................... 1-1

1.1 Features ............................................................................................................1-1

1.2 Specications

1.2.1 Standard Specications .....................................................................1-2

1.2.2 Model and Sufx Codes .....................................................................1-3

1.2.3 External View and Dimensions ..........................................................1-4

....................................................................................................1-2

2. Components and Their Functions .......................................................... 2-1

3. Installing the Sensor and Connecting the Cable .................................. 3-1

3.1 PreparingforInstallation ................................................................................. 3-1

3.1.1 Removal of Parts for Transportation and Storage ............................ 3-1

3.1.2 Inspecting the Permeable Membrane ...............................................3-1

3.2 Installation .........................................................................................................3-2

3.2.1 Selecting the Measurement Point ...................................................... 3-2

3.2.2 Selecting the Sensor Holder ..............................................................3-2

3.2.3 Asembling the Sensor in the Holder ..................................................3-4

3.3 Connecting the Sensor Cable ..........................................................................3-4

4. Maintenance .............................................................................................. 4-1

4.1 Routine Inspection ............................................................................................4-1

4.1.1 Inspecting the Permeable Membrane (Degree of Contamination) ...4-1

4.1.2 Checking of Membrane Assembly Locknut .......................................4-1

4.2 Inspection If Failure Occurs .............................................................................4-2

4.2.1 Inspecting the Permeable-membrane Assembly (for Damage) ........4-2

4.2.2 Checking of RTD in the Sensor ......................................................... 4-4

4.2.3 Judgment of Lead Electrode Fault ..................................................... 4-4

4.3 Expendables,SparePartsandMaintenanceParts ....................................... 4-4

4.3.1 DOX8A Maintenance Parts (Expendables) Kit ..................................4-4

4.3.2 Parts That Should Be Kept on Hand .................................................. 4-5

Appendix1"HowtoRemovetheDO30GMembraneProtectiveCap" ................................... A-1

CustomerMaintenancePartsList(DO30G) ...................................................................CMPL12J5B3-01E

CustomerMaintenancePartsList(DOX8A) ..............................................................CMPL12J05B03-12E

Revision Record ............................................................................................................................................... i

IM 12J5B3-01E

4th Edition : Apr 05,2011

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<1. General>

F01.ai

Sensor cable

Sensor unit

Permeable-membrane assembly

Pin-type crimping terminals

Fork-type crimping terminals

M4 ring-type crimping terminals

1. General

1-1

1.1 Features

• The sensor maintains stable characteristics over a prolonged period.

It stabilizes in a initial time for electrolysis of approximately a half a day.

The sensor has a structure less susceptible to the effects of deterioration in an electrolyte or

contamination of the permeable membrane. Consequently, you can make precise measurements in a variety of processes.

• You can choose the desired measurement point according to the nature of the solution being measured.

You can submerse the DO30G Dissolved Oxygen Sensor to a depth of 3 m and then put it in

regular use (the sensor can withstand a pressure of up to 100 kPa). The sensor can be assembled into a immersion type holder or a oating ball holder. The sensor, when assembled

in the immersion type holder, allows automatic cleaning of the sensor with jet-sprayed water or air at regular intervals.

• The sensor is easy to service and very economical.

Dissolved oxygen sensors usually deteriorate with time and ultimately come to the end of

their service life. For the DO30G Dissolved Oxygen Sensor, only those parts whose service lives are relatively short, such as the membrane, may be replaced. Thus, running costs can be reduced. In addition, servicing and maintaining the sensor requires no special skills and is done quickly.

Figure 1.1 External View of the DO30G Dissolved Oxygen Sensor

Note: The crimping terminals used on the sensor cables are either pin-type, M4 ring-type or fork-type depending on specications.

IM 12J5B3-01E

4th Edition : Apr 05,2011

<1. General>

1-2

IM 12J5B3-01E

1.2 Specications

1.2.1 StandardSpecications

Object of Measurement: Concentration of oxygen dissolved in solution (water)

Principle of Measurement: Galvanic-cell method

Measurement Range: 0 to 20 ppm, 0 to 20 mg/l, or 0 to 100% (saturation)

Note: The measurement range must be entered through the dissolved oxygen converter.

Resistance Temperture Detector (RTD) :

Pt 1000

Construction: Sensor unit : Rigid PVC, SUS304

O-ring: Nitrile rubber

Permeable membrane: Fluoro-resin [FEP]

Cable shielding : Heat-resistant exible PVC

Outlet of cable : Polycarbonate resin

Sensor Cable: Length : 3 m, 5 m, 10 m, 15 m, or 20 m

(specied when ordering)

Crimping terminal conguration : Pin-type, M4 Ring-type or Fork-type (specied when ordering )

Weight: Approx. 0.3 kg + 0.12 × N kg N: cable length

(e.g. for cable length of 5 m, approx. 0.9 kg)

Temperature of Solution Under Measurement (SUM) :

max. 0 to 40 °C

Flow rate of SUM: No less than 20 cm/s (recommended to prevent the sensor

from trapping bubbles that are the source of error in

measurements)

Pressure of SUM: Narmally : 0 to 30 kPa

Maximum applicable : 100 kPa

[Characteristics]

Repeatability:

Temperature Compensation Error:

Within ±3% FS

(including sensor) for a ±5 °C change in the range of 0 to 40 °C

Response Time : Within 2 minutes (90% response)

(including sensor)

0.1 mg/l or 3% FS, whichever is greater (including sensor)

4th Edition : Apr 05,2011

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