DO30G Dissolved-Oxygen Sensor
Contents
1. 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 Media No IM 12J5B3 01E CD 5th Edition Nov 2015 YK IM 12J5B3 01E 5th Edition Nov 20 2015 00 All Rights Reserved Copyright 1996 Yokogawa Electric Corporation 1 2 3 lt INTRODUCTION gt ii For the safe use of this equipment 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 office This manual does not cover the special specifications This manual may be left unchanged on any change of specification 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 specified in this manual the safety of this product may be impaired Safety and Modification Precautions Follow the safety precautions in this manual when usin2. whichever is greater including sensor 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 IM 12J5B3 01E 5th Edition Nov 20 2015 00 lt 1 General gt 1 3 1 2 2 Model and Suffix Codes DO Sensor Suffix Code Option Code Description eccccccccccccccocs coccccccccccceeccsees Dissolved Oxygen Sensor TT Always NN Membrane thickness eeeeceeceeseescecseee 50 UM Cable length covsccccccccacsccoss 3m OT 5m evccccccccccccccccces 10 M evcccccccccccccccccs 15 M evcccccccccccccccces 20 M Cable terminal secccccceccceccoceees Pin terminal 1 Fork terminal MA ring terminal 2 Mi Select pin terminal for DO402G DO202 and FLXA202 FLXA21 When terminal box is used select WTB10 DO3 2 Used to connection to FLXA202 FLXA21 When terminal box is used select WTB10 DO4 DOX8A Parts Set for Maintenance Suffix Code Option Code Description v0reenenesesnenene cescsscsosacasosso Parts set for maintenance for membrane thickness of 50 um Sensor Ee Go For membrane replacing type sensor Style B Aset of zero adjusting reagent and maintenance parts lt Contents gt Zero adjusting reagent sodium sulfite 500 g 1 bottle Membrane assembly for membrane thickness of 50 um 3 sets Electrolyte for sensor 50 mL 1 bottle Syringe for rep
3. 6Pull off the protective cap while maintaining the air space Push it beneath the protective cap and up to the tip of the sensor lt Appendix 1 gt A 2 When an appropriate stick or the like is not available 1 Hold the protective cap while holding the DO30G as shown in the figure 7 Figure 7Hold the DO30G and protective cap 2 Remove the protective cap by turning it clockwise slowly Turn it clockwise slowly Figure 8Remove the protective cap by turning it clockwise slowly IM 12J5B3 01E 5th Edition Nov 20 2015 00 DO Customer Dissolved Oxygen Metering System Maintenance DO30G Parts List Dissolved Oxygen Sensor lte Part No Qty Description 1 1 Dissolved oxygen sensor Refer to table of below Model amp Code 2 K9171CH 1 Box nut assembly 3 K9171HM 1 Membrane O ring Suffix Code Description O A Dissolved oxygen sensor NN EE Always NN Membrane thickness SEQ An 50 um Cablelength 03 Teen 3m Cable terminal SPIN A EA Pin terminal ovenvennsnunnnnnnnnnnner Fork terminal svnnnnnnnnnunnnunennunne M4 ring terminal All Rights Reserved Copyright O 1996 Yokogawa Electric Corporation YO KOGAWA Subject to change without notice C MPL 1 2J 5 B3 01 E gt Ri 3rd Edition Oct 2010 Yokogawa Electric Corporation EXA DO nt ce Model DOX8A M B Parts List Accessory for EXA DO 2 4 wo 7 les AAA ltem PartNo
4. P 4 1 FLXA21 and DO202 manual no added to section 4 Maintenance P 4 3 Stabilized time in a initial time for electrolysis modified Appendix 1 How to Remove the DO30G Membrane Protective Cap added to end of this manual CMPL 12J5B3 01E revised to 3rd edition M4 ring terminal added 1 2 3 P P P P St P Mar 2010 3rd Edition MS code of DOX8A DOX8W added to Section 1 2 2 CMPL 12J05B03 12E 2 added for DOX8A May 2007 2nd Edition Fully revised Nov 1996 1st Edition Newly published If you want to have more information about Yokogawa products you can visit Yokogawa s home page at the following web site Home page http www yokogawa com an IM 12J5B3 01E 5th Edition Nov 20 2015 00
5. Qty Description 1 L9825AF 1 200 ml Beaker 2 L9920BR 1 Reagent for zero calibration 3 K9088PE 1 Polishing Powder 4 K9171HK 1 Spare Parts amp Service Tool 5 K9171DN 1 Electrolyte 6 K9171HM 3 Membrane O Ring Set 7 G9303NM 1 O Ring 8 K9171CS 1 Membrane Assembly 50 um 9 L9827NG 1 Needle 10 L9827NH 1 5 ml Sylinge All Rights Reserved Copyright O 1996 Yokogawa Electric Corporation COMPL 12J05B03 12E YOKOGAWA Subject to change without notice 2nd Edition Feb 2006 YK Yokogawa Electric Corporation Revision Record e Title Model DO30G Dissolved Oxygen Sensor O Manual No IM 12J5B3 01E Nov 2015 5th Edition Added FLXA202 Pi P1 3 P1 4 P3 4 P4 1 Supplement of 4th Edition P1 2 Some revision of construction for sec 1 2 1 P4 3 Some revision of Section 4 2 1 Inspecting the Permeable membrane Assembly P 4 5 Some revision of Table 4 1 Apr 2011 4th Edition Over all revised P i FLXA21 and DO202 manual no added to documnents to be refered P 1 1 Stabilized time in a initial time for electrolysis modified M4 ring terminal added to Figure 1 1 P 1 2 M4 ring type terminal added to specifications 1 3 FLXA21 added to MS code 4 M4 ring terminal added to Figure 1 2 1 M4 ring terminal added to Figure 2 1 1 Addition of Appendix 1 to be refered for section 3 1 1 Removal of Parts for Transportation and orage 3 4 FLXA21 and DO202 manual no added to section 3 3 Connecting the Sensor Cable
6. converter terminals for connection to sensor cable 1 Liquid earth to detect membrane failure This function is available when using PB350G PB360G float type holder Connect only when using this function Sensor cable FO8 ai Figure 3 5 Connection of Sensor Cable Now the explanation on the installation and wiring is completed For details on operation during startup or for regular operation after the entire measuring system is brought into operation refer to the DO402G Dissolved Oxygen Converter instruction manual IM 12J05D02 01E the FLXA202 FLXA21 DO202 2 wire Transmitter instruction manual IM 12A01A02 01E IM 12J05C01 01E The maintenance and service ofthe dissolved oxygen sensor is explained in Section 4 that follows IM 12J5B3 01E 5th Edition Nov 20 2015 00 lt 4 Maintenance gt 4 1 4 Maintenance This section describes the inspection and maintenance procedure applicable to just the dissolved oxygen sensor alone For comprehensive inspection and tuning of the measuring system such as calibration see the DO402G Dissolved Oxygen Converter instruction manual IM 12J05D02 01E the FLXA202 FLXA21 DO202 2 wire Transmitter instruction manual IM 12A01A02 01E IM 12J05C01 01E 4 1 Routine Inspection 4 1 1 Inspecting the Permeable Membrane Degree of Contamination An inspection visual of the permeable membrane must be made whenever the sensor is calibrated Any dirt on the membrane will adversely affect yo
7. months or if a span adjustment is not possible Eight to 9 ml are consumed with each replacement Normally these parts must be replaced at the same time Permeable membrane that the sensor is refilled with electrolyte If the sensor K9171HM 3 sets i i assembly O ring is used in a slurry solution these parts may require replacement more often due to abrasion or damage Calibration must be carried out at a predetermined interval the frequency of calibration varies depending on the operating conditions Calibration must also be L9920BR 500g performed when for example the electrolyte is replaced Approximately 50 grams of the reagent is needed to prepare 1 liter of the calibration solution for zero adjustment Reagent for preparing calibration solution for zero adjustment sodium sulfite Na2503 5 mL syringe without needle L9827NH 1 Needle L9827NG 1 Used when replacing the electrolyte Used when calibration is carried out or when the 200 mL beaker L9825AF 1 electrolyte is replaced Polish the silver electrode every time the permeable membrane assembly is replaced Each polishing usually needs only a very small amount of alumina about 0 5 g Abrasive for silver electrode alumina K9088PE 30g 4 3 2 Parts That Should Be Kept on Hand Even parts with a long service life are not completely free from possible failure It is recommended that users have on hand spare
8. parts for those parts which if they become defective will make it impossible to continue measurement Membrane Assembly Locknut part number K9171CH It is recommended that users have spare parts for the locknut on hand in preparation for possible failure Spare Sensor Assembly If the sensor assembly remains unused over a prolonged period the electrolyte may change in quality or some anomalies may occur in the permeable membrane Consequently these materials must be replaced with new ones before you can use the sensor Although it is desirable that users always try to avoid storing the sensor assembly for long periods the manufacturer recommends that users keep a spare part on hand for the sensor assembly in anticipation of an unexpected failure Do not store the sensor with the electrolyte removed Otherwise any residual electrolyte may become concentrated harming the lead electrode or other mechanisms If the sensor must be stored with the electrolyte removed completely clean the inside of the sensor with clean water repeat injecting and draining the water several times before it is stored Note If the sensor is stored without the electrolyte repeat injecting and draining the electrolyte several times before you reuse it IM 12J5B3 01E 5th Edition Nov 20 2015 00 lt Appendix 1 gt A 1 Appendix 1 How to Remove the DO30G Membrane ProtectiveCap CAUTION A black rubber cap is attached to the tip of the DO30G to p
9. 8HS Immersion Type Holder with Jet Cleaner IM 12J5B3 01E 5th Edition Nov 20 2015 00 3 2 3 3 3 lt 3 Installing the Sensor and Connecting the Cable gt 3 4 Asembling the Sensor in the Holder For details on how to assmble the sensor in the holder or fitting see the appropriate instruction manual for each holder or fitting CAUTION Exercise care not to contaminate or wet the tip of the sensor cable when assembling the sensor If you will not begin wiring the sensor cable immediately take the protective measures necessary to prevent the assembly from being damaged Sensor mounting in the case where flocs and other matter are contained in the SUM Stopper F07 The stopper projecting from the membrane assembly locknut serves to prevent the membrane from being in contact with the ground and thus being damaged If there are flocs in the SUM the stopper may become clogged Thus assemble the sensor to the holder so that the stopper is positioned downstream in the SUM Connecting the Sensor Cable The cable of the dissolved oxygen sensor must be connected to the terminals of the dissolved oxygen converter For information on connections refer to the following instruction manuals DO402G Dissolved Oxygen Converter IM 12J05D02 01E the FLXA202 FLXA21 D0202 2 wire Transmitter instruction manual IM 12A01A02 01E IM 12J05C01 01E or WTB10 DO L Relay Terminal Box IM 12J05W02 01E Dissolved oxygen Jumper
10. J5B3 01E 5th Edition Nov 20 2015 00 lt CONTENTS gt v Dissolved Oxygen Metering System Model DO30G Dissolved Oxygen Sensor IM 12J5B3 01E 5th Edition CONTENTS Mi ee i For the safe use of this equipment rrxnrnnnvnnnnnnnnvrnnnvnnnnnnnvnnnnnnnnvnnnnennnnnnnnn ii O After sales Warranty rrnrrnvrnvnnnvnvvrnvnnvrnvnnvrnnvnnnnnennvnnennnenvernennennenvennnnrnenne iii 1 General nee 1 1 1 1 Feat iu 1 1 1 2 SPECI CATIONS inicia de 1 2 1 2 1 Standard SpecificatiONS oooonnncninnnnnnncnnnconnnnonccnnccnnnrcnnnrnnnrnnnnno 1 2 1 2 2 Model and Suffix COdes rrrnrnrnnnrnnnvnnnvnnnvnnnvvnnvnnnvensvensrensrensrensrensnnn 1 3 1 2 3 External View and Dimensions wsrnrrvvrnvvnnvvrnvonnverrvvnrvnnsvenrrnnsrennnenn 1 4 2 Components and Their FunctionsS asvrrnrnnvvvnnnnnnvnnnnnnnnvnnnnnnvnvnnnnnnenennnn 2 1 3 Installing the Sensor and Connecting the Cable rrnnennnnvnnnnnvnnnnnnennnn 3 1 3 1 Preparing for Installation seranennnrnnnnnnvennnennnnnnnnnnnnnnnnnnnnnnnnnnnnnnnennnnnnnnnnnnnnenn 3 1 3 1 1 Removal of Parts for Transportation and Storage s e 3 1 3 1 2 Inspecting the Permeable Membrane anrnnnrnnnrnnnvnnnvnnnvnnnrnnnrnennnen 3 1 3 2 Installation omo cite eee dev ane bahn anna ahnen ahnen inn 3 2 3 2 1 Selecting the Measurement Point rannnnnnnnnnnnnnnnnrnnnrnnnrnnnrnenrrsnrnennr 3 2 3 2 2 selecting the Sensor Holder i lt coomiscioridiniina caridad 3 2 3 2 3 A
11. O30G NN 50 20 FK Ring terminals Model and Suffix Codes Weight kg DO30G NN 50 03 FL 3000 Approx 0 6 DO30G NN 50 05 FL Approx 0 8 DO30G NN 50 10 FL Approx 1 4 DO30G NN 50 15 FL Approx 2 0 DO30G NN 50 20 FL Note Select pin terminasl for systems using the DO402G FLXA21 dissolved oxygen converter When using with FLXA202 FLXA21 M4 ring terminals is recommended Figure 1 2 External View and Dimensions of DO30G Dissolved Oxygen Sensor IM 12J5B3 01E Approx 2 6 5th Edition Nov 20 2015 00 lt 2 Components and Their Functions gt 2 1 2 Components and Their Functions Sensor cable Carries the detected signal to the dissolved oxygen converter The desired cable length can be chosen from 3 5 10 15 or 20m You can choose either pin type M4 ring type or fork type terminals Permeable membrane assembly locknut Sensor unit Generates both an electrolytic current signal proportional to the amount of oxygen that passes through the permeable membrane and a temperature signal for compensation O ring Lead electrode Permeable membrane assembly EAS N SND SED Silver electrode Temperature Detector Cutaway View of the Sensor Tip F03 ai Figure 2 1 Components and Their Functions of DO30G Dissolved Oxygen Sensor CAUTION Do not loosen the permeable membrane assembly locknut except when
12. User s Manual Dissolved Oxygen Metering System Model DO30G Dissolved Oxygen Sensor IM 12J5B3 01E vigilantplant YOKOGAWA 9 IM 12J5B3 01E i f 5th Edition Yokogawa Electric Corporation lt INTRODUCTION gt i Introduction The DO30G Dissolved Oxygen Sensor bases its principle of measurement on the galvanic cell method The sensor is specifically 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 Confirming the Specifications The standard specification DO30G dissolved oxygen sensor is used to build the dissolved oxygen metering system The DO306 sensor cable has the prescribed length The configuration 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 s
13. ation Yokogawa shall conduct defined 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 O 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 Failure due to improper or insufficient maintenance by user Failure due to abuse misuse or modification which Yokogawa does not authorize Failure due to power supply voltage frequency being outside specifications or abnormal Failure caused by any usage out of scope of recommended usage Any damage from fire earthquake storms and floods lightning disturbances riots warfare radiation and other natural changes e Yokogawa does not warrant conformance with the specific application at the user site Yokogawa will not bear direct indirect responsibility for damage due to a specific application e Yokogawa will not bear responsibility when user configures the product into systems or resells the product O Maintenance service and supplying repair parts will be covered for five years after the production ends For repair for this product please contact the nearest sales office described in this instruction manual IM 12
14. e O ring F10 ai Figure 4 2 Injecting the Electrolyte All these steps complete the inspection procedure for the permeable membrane assembly By way of precaution make sure the membrane is free from wrinkling Note that a stable detection signal is not possible right after refilling with the electrolyte Make a zero or span adjustment approximately a half a day or longer after refilling It may indicate a minus value for about 10 minutes zero adjustment IM 12J5B3 01E 5th Edition Nov 20 2015 00 4 2 2 4 2 3 4 3 4 3 1 lt 4 Maintenance gt 4 4 Checking of RTD in the Sensor The resistance temperature detector RTD incorporated in the DO30G sensor is a Pt1000Q RTD This Pt1000Q RTD indicates a resistance value of about 10970 at 25 C Check the RTD by measuring the resistance value between conductors 11 T1 and 12 T2 If the resistance value differs greatly from the above value the sensor must be replaced Judgment of Lead Electrode Fault If no failure is found in the checks in Subsections 4 2 1 and 4 2 2 the cause of the problem may be the end of the service life of the lead electrode or a loose connection of the conductors In either case the sensor must be replaced Service Life of Lead Electrode The lead electrode mounted in the sensor body gradually erodes due to battery action When span adjustment becomes impossible for a sensor which has been used in succession over a long period even if the electrolyte
15. ent results This section explains how to select the measurement point and sensor holder Selecting the Measurement Point Normally a location that meets the following requirements may be selected as the measurement point The measured value is representative among the values available for the solution under measurement SUM Avoid choosing a location where the solution is unevenly distributed since heavy hunting may result in the measured value Also avoid locations where bubbles occur frequently The temperature and flowrate comply with the operating conditions required of the sensor and holder Note that if a measured solution running at a high flow rate contains particles of sand the permeable membrane of the sensor may be damaged Do not install the sensor at a depth greater than 3 m Selecting the Sensor Holder Each holder or fitting where the DO30G Dissolved Oxygen Sensor is assembled has the following characteristics Choose a holder that suits the liquid to be measured and the measurement location PH8HG Guide Pipe The holder is made of PVC resin and is 2 m long The sensor is suspended down inside the cylindrical barrel of the holder This pipe is conveniently suited for the measurement of a solution free from bubbles or pollutants Sensor cable Stopper Mounting pipe Outer diameter of 60 5 mm Guide pipe if Dissolved oxygen sensor Y IL D N Uy F05 ai Figure 3 2 Suspension
16. g the product to ensure protection and safety of the human body the product and the system containing the product The following safety symbols are used on the product as well as in this manual The following safety symbols are used in this manual A CAUTION Identifies instructions that must be observed in order to avoid physical injury and electric shock or death of the operator A WARNING Identifies instructions that must be observed in order to prevent the software or hardware from being damaged or the system from becoming faulty A IMPORTANT TIP SEE ALSO Identifies important information required to understand operations or functions Identifies additional information Identifies a source to be referred to IM 12J5B3 01E 5th Edition Nov 20 2015 00 lt INTRODUCTION gt iii After sales Warranty e Do not modify the product e During the warranty period for repair under warranty carry or send the product to the local sales representative or service office Yokogawa will replace or repair any damaged parts and return the product to you e 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 O If we replace the product with a new one we won t provide you with a repair report O Yokogawa warrants the product for the period stated in the pre purchase quot
17. lacing electrolyte 1 Polish for silver electrode 30 g 1 bottle Polyethylene beaker 200 mL 1 e DOX8W Calibration Set optional Suffix Code Option Code Description A eccccccccceecccccees Calibration set This is necessary if the span calibration is to be done using a saturated dissolved oxygen solution It is not necessary for air calibration lt Contents gt Air pump stirrer stirring element bubbler clamp beaker and thermometer Note The calibration set can be used in common regardless of the type of holder IM 12J5B3 01E 5th Edition Nov 20 2015 00 lt 1 General gt 1 4 1 2 3 External View and Dimensions Dissolved oxygen sensor with pin terminals 11 1 P E E E E 4 Approx 80 gt 108 230 936 gt Dissolved oxygen sensor with fork terminals 1112 14 13 15 16 Dissolved oxygen sensor with ring terminals Terminal asign 13 IE 15 RE 11 T1 12 T2 14 Shield 16 Liquid earth Pin terminals Model and Suffix Codes DO30G NN 50 03 PN Unit mm Weight kg DO30G NN 50 05 PN DO30G NN 50 10 PN DO30G NN 50 15 PN DO30G NN 50 20 PN Fork terminals Model and Suffix Codes Weight kg DO30G NN 50 03 FK DO30G NN 50 05 FK DO30G NN 50 10 FK DO30G NN 50 15 FK D
18. ly FO1 ai 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 specifications IM 12J5B3 01E 5th Edition Nov 20 2015 00 lt 1 General gt 1 2 1 2 Specifications 1 2 1 Standard Specifications 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 Pt1000 Construction Sensor unit Rigid PVC Stainles steel O ring Nitrile rubber Permeable membrane Fluoro resin FEP Cable shielding Heat resistant flexible PVC Outlet of cable Polycarbonate resin Sensor Cable Length 3m 5m 10 m 15 m or 20 m specified when ordering Crimping terminal configuration Pin type M4 Ring type or Fork type specified when ordering Weight Approx 0 3 kg 0 12xNkg 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 0 1 mg L or 3 FS
19. membrane assembly has been replaced it shows that the lead electrode has reached the end of its service life The service life of the lead electrode varies with the temperature of the SUM or the amount of dissolved oxygen Under general operating conditions it should be approximately three to four years Expendables Spare Parts and Maintenance Parts This section presents the general information on spare parts that the manufacturer recommends you to provide and on materials that are used in maintenance and service When procuring these parts or materials also refer to the Customer Maintenance Parts List CMPL at the end of this manual DOX8A Maintenance Parts Expendables Kit The DOX8A Maintenance Parts Kit contains as a set spare parts for the expendables that need to be replaced within one year after the start of use of the DO30G Dissolved Oxygen Sensor the materials that are used during replacement and a reagent that is used to prepare the calibration solution for zero adjustment Note There are two different DOX8A Maintenance Parts Kit available style A and style B Be sure to use a style B membrane assembly membrane thickness 50 um for a EXA Do dissolved oxygen metering system IM 12J5B3 01E 5th Edition Nov 20 2015 00 lt 4 Maintenance gt 4 5 Table 4 1 Items Contained in the DOX8A Maintenance Parts Kit Item Part No Qty Remarks Must be replaced periodically either once every 6 to 8 Electrolyte K9171DN 50 mL
20. of Dissolved Oxygen Sensor Using PH8HG Guide Pipe IM 12J5B3 01E 5th Edition Nov 20 2015 00 lt 3 Installing the Sensor and Connecting the Cable gt 3 3 PB350G Angled Floating Ball Holder The fitting is designed to contain the sensor in a sphere that floats on a liquid This fitting is immune to large variations in the liquid level Since the wet part is smooth and less susceptible to catching flocs the sensor does not trap rubbish that mixes in with the SUM Related description See Subsection 3 2 3 The float is supported by an arm and does not move away from the measurement point even if the SUM is flowing When using this holder the membrane damage detector function in the converter can be activated Arm assembly Sensor cable Float Mounting bracket Fix the bracket to a nominal 50 A pipe OD of 60 5 mm or a horizontal surface floor the edge of a solution tank etc FO06 ai Figure 3 3 Suspension of Dissolved Oxygen Sensor Using PB350G Angled Floating Ball Holder DOX8HS Style B Immersion Type Holder The holder holds the sensor at an angle of 45 Consequently bubbles will not stick to the permeable membranne Any pollutants in the SUM can be automatically cleaned off at regular intervals using a jet spray water air cleaner mu u A Cleaning utility pipe __ Sensor cable Dissolved oxygen sensor Jet cleaner Ui F07 ai Figure 3 4 Suspension of Dissolved Oxygen Sensor Using DOX
21. replacing the assembly IM 12J5B3 01E 5th Edition Nov 20 2015 00 3 3 1 3 1 1 3 1 2 lt 3 Installing the Sensor and Connecting the Cable gt 3 1 Installing the Sensor and Connecting the Cable Preparing for Installation Removal of Parts for Transportation and Storage A cap to prevent the membrane from being damaged when transporting the sensor is mounted at the tip of the DO30G Dissolved Oxygen Sensor When installing the sensor remove this protective cap See Appendix 1 Inspecting the Permeable Membrane Any wrinkling or damage to the permeable membrane may lead to a failure to take normal measurements Make sure the membrane is free from any wrinkling or damage Also check that the membrane assembly locknut is not loose If any wrinkling or damage is found replace the membrane assembly with a new assembly unless such damage is slight Permeable membrane assembly locknut Make sure the locknut is not loose Permeable membrane Make sure the membrane is free from any wrinkling or damage F04 ai Figure 3 1 Inspection of Permeable membrane Assembly IM 12J5B3 01E 5th Edition Nov 20 2015 00 3 2 3 2 1 3 2 2 lt 3 Installing the Sensor and Connecting the Cable gt 3 2 Installation Normally the DO30G Dissolved Oxygen Sensor is assembled into the PH8HG Guide Pipe PB350G Angled Floating Ball Holder or DOX8HS Immersion Type Holder and submersed to the point best suited to obtain precise measurem
22. rotect the membrane Pulling off the cap forcefully causes a negative pressure inside the protective cap because the protective cap sticks to the DO30G and may stretch the membrane or damage it Furthermore removing the cap by twisting it may loosen the membrane assembly and affect the measurement results Please read the following notes and removal procedure in advance in order to prevent damage and loosening of the membrane assembly from occurring 1 Prohibited actions A Prohibited action 1 A Prohibited action 2 No good No good Figure 1 Do not pull off the cap forcefully Figure 2 Do not pull off the cap twisting the cap counterclockwise 2 How to Remove Protective Cap When taking out of the package a black rubber cap is attached the DO30G shown below DO30G Protective cap Figure 3 Condition after taking out of the package IM 12J5B3 01E 5th Edition Nov 20 2015 00 When using a stick or the like 1 As shown in the figure 4 insert a stick or the like between the DO30G and protective cap Be careful not to damage the DO30G main body Stick or the like Protective with a diameter of cap 0 1 to 0 2 mm Figure 4Insert a stick or the like between the DO30G 2 Push it in so that enough air space is created between the DO30G and protective cap Figure 5Push a stick or the like beneath the protective cap to create air space Protective ca p Maintain the space DO30G tip Figure
23. sembling the Sensor in the Holder sreanrnnnvnnnvnnnrnenrnnnrnnnvnnnrnenreenn 3 4 3 3 Connecting the Sensor Cable srrsnrnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn 3 4 4 Maintenance nee 4 1 4 1 Routine Inspection u e een 4 1 4 1 1 Inspecting the Permeable Membrane Degree of Contamination 4 1 4 1 2 Checking of Membrane Assembly Locknut 4 en 4 1 4 2 Inspection If Failure OCCUS rnnnnnnnnvnnnnvnnnnvnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnennnnennnnen 4 2 4 2 1 Inspecting the Permeable membrane Assembly for Damage 4 2 4 2 2 Checking of RTD in the Sensor unsrnsensennennnennnnnnnnnnnnnn nennen 4 4 4 2 3 Judgment of Lead Electrode Fault arranrnonvnonvnnnrnrnrnnnrnnnrnrnrernveenn 4 4 4 3 Expendables Spare Parts and Maintenance PartsS rrrnvrnrnnnnvnnnnnnvvnrnnnnnennn 4 4 4 3 1 DOX8A Maintenance Parts Expendables Kit 4 4 4 3 2 Parts That Should Be Kept on Hand nennen 4 5 IM 12J5B3 01E 5th Edition Nov 20 2015 00 lt CONTENTS gt Appendix 1 How to Remove the DO30G Membrane ProtectiveCap A 1 Customer Maintenance Parts List DO30G CMPL 12J5B3 01E Customer Maintenance Parts List DOX8A CMPL 12J05B03 12E Revision Record IM 12J5B3 01E 5th Edition Nov 10 2015 00 vi lt 1 General gt 1 1 1 1 1 Sen
24. sor unit General 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 itin 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 floating 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 Pin type crimping terminals Sensor cable Fork type crimping terminals MA ring type crimping terminals Permeable membrane assemb
25. taining potassium hydroxide as the major constituent Exercise extreme care to protect your body from contact with the solution and to prevent the solution from getting into your eyes Should your skin or eyes become exposed to the solution immediately wash the exposed area with clean water If the solution gets in your eyes consult an eye doctor after flushing them with water The electrolyte is a colorless corrosive and therefore there is the risk of its being mishandled Never leave any residual solution in the syringe 1 After having removed the dissolved oxygen sensor from the holder clean dirt off the wet part 2 Loosen the locknut and remove the permeable membrane assembly Also remove the O ring IM 12J5B3 01E 5th Edition Nov 20 2015 00 lt 4 Maintenance gt 4 3 3 Completely drain the electrolyte within the sensor unit Tilt the sensor tip downward and then use the syringe to force air into the inlet for refilling the electrolyte Position the beaker so it will catch any of the electrolyte that drains through the gaps around the silver electrode Inlet for refilling electrolyte Sensor unit Needle syringe needle Insert the syringe needle into the inlet for refilling electrolyte and force air inside FO9 ai Place a beaker underneath to catch the draining electrolyte Silver electrode Syringe Figure 4 1 Draining the Electrolyte 4 Removing dirt deposits or stains from the surface of
26. the silver electrode Lay the sensor horizontally Apply alumina as an abrasive to moistened gauze and polish the surface of the silver electrode to remove any stains from the surface Do not polish excessively A mirror finished surface of the electrode or any damage to the epoxy materials around the electrode may affect the performance of the sensor After polishing wipe the alumina off the electrode completely 5 Make sure the sealed surfaces are free from dust Install a new O ring 6 Inject 8 ml of electrolyte into the sensor body with the syringe see Figure 4 2 Note Always use an electrolyte prepared by Yokogawa for exclusive use with the DO30G First fill the sensor with the electrolyte approx 9 ml and then remove approximately 1 ml so that a layer of air is present inside the sensor body 7 Install the permeable membrane assembly It is strictly not possible to allow a layer of air to form between the membrane and the silver electrode To prevent such a layer from forming first apply a drop of electrolyte to the surface of the silver electrode Lightly press the permeable membrane assembly so that the O ring touches the groove on the inside Tighten the locknut fully without letting the assembly turn F Syringe Surface of the silver electrode Apply a drop of electrolyte when installing the permeable membrane assembly Fill with electrolyte and then remove approximately 1 mL Inlet for injecting electrolyt
27. ticular location follow the instructions in Section 4 2 1 and subsequent sections in sequence One or more of the following measures are necessary to remedy the failure Replacement of electrolyte permeable membrane assembly e Replacement of sensor unit Inspecting the Permeable membrane Assembly for Damage Note When the membrane is used in the float holder the converter membrane damage detector function can be used This function generates an E4 error message if the membrane is damaged Check the permeable membrane assembly for possible wrinkling or damage Also check that the permeable membrane assembly locknut is not loose If the locknut is securely tightened and the membrane is normal no wrinkling or damage is found proceed to the instruction procedure in Section 4 2 2 If the locknut is loosen or the membrane is wrinkled or damaged replace the electrolyte and the permeable membrane assembly including the O ring seal as well Electrolyte permeable membrane assembly replacement procedure When replacing the electrolyte and permeable membrane assembly you must provide a syringe and beaker that are used to replace the electrolyte and an abrasive and gauze to polish the silver electrodes Provide these materials along with the spare electrolyte solution and assembly used in the replacement CAUTION Precautions in Handling the Electrolyte The potassium hydroxide electrolyte KOH is a highly alkaline solution con
28. ubsection 1 2 2 on page 1 3 Note The model and suffix code of the sensor with standard specifications is as follows DO30G NN 50 0 047 0 0 User specified 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 DO Dissolved Oxygen Metering System 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 2 wire Dissolved Oxygen Transmitter IM 12J05C01 01E FLXA202 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 PH3PU1 Cleaning Pump Tank IM 19C1E1 01E WTB10 DO Relay Terminal Box IM 12J05W02 01E
29. ur measurements If the dirt is spread over the membrane dip the membrane into clean water and gently wipe the dirt off with a soft cloth or lint free paper If the dirt will not come off easily apply a neutral detergent to the membrane so it will be easier to remove the dirt Clean the membrane with clean water Finally make sure the permeable membrane assembly locknut is not loose CAUTION Exercise care to avoid wrinkling or damaging the permeable membrane during inspection Wrinkling and other damage prevent normal membrane operation 4 1 2 Checking of Membrane Assembly Locknut At every calibration check that the membrane assembly locknut is not loose If it is retighten it In addition if a phenomenon which is considered to be due to a change in the electrolyte quality e g showing extremely low measured values is observed after the locknut is retightened replace the electrolyte according to the directions in Subsection 4 2 1 IM 12J5B3 01E 5th Edition Nov 20 2015 00 4 2 4 2 1 lt 4 Maintenance gt 4 2 Inspection If Failure Occurs Ifthe electrolyte and or lead electrode within the sensor unit deteriorates and ultimately completes its service life anomalies such as the failure to make a span adjustment will occur This section deals especially with the inspection and service of the dissolved oxygen sensor needed if any anomaly is found in a detected signal If you fail to pinpoint the cause of failure to a par
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