Horiba Scientific LAQUAact D-75G Скачать руководство пользователя страница 110 | Manualshive

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Technical note

88

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Dissolved oxygen measurement

Dissolved oxygen (DO) is the concentration of oxygen that is dissolved in water. DO is
essential in the self-cleaning mechanism of rivers and seas and for fish and other aquatic
animals. The measurement of DO is also essential for waste-water treatment and water-
quality management.
The principles of measurement using a DO tip are explained below.

A precious metal (silver) is used as the cathode, which is tightly affixed to an oxygen-
permeable membrane, and a base metal (lead) is used as the anode. Both the cathode
and anode are immersed in an alkaline electrolytic solution. The external circuit between
the anode and cathode is closed. Oxygen that diffuses through the oxygen-permeable
membrane causes the following chain reaction to occur in the cathode and allows current
to flow in the external circuit.

Whereas, the following oxidation reaction occurs at the anode.

This current is proportional to the amount of oxygen that is diffused through the oxygen-
permeable membrane, so measuring the current of the sample enables the DO
contained within the sample to be determined. The DO measurement method that is
based on this principle is called the “Membrane electrode method.” This is a much
simpler and more convenient way of measuring DO than using chemical analysis, which
requires complex pretreatment in order to eliminate the effects of reductants and
oxidants in the sample.

Anode (lead)

Alkaline electrolyte

Gas-permeable membrane

Electrode

Cathode (silver)

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Содержание LAQUAact D-75G

Страница 1: ...uction Manual pH ORP Dissolved Oxygen Meter D 75G Preface Part names and basic operation Measurement Various functions Maintenance How to resolve errors or troubles Appendix Portable pH Water Quality...

Страница 2: ......

Страница 3: ...ation Any malfunction attributable to repair or modification by any person not authorized by HORIBA Advanced Techno Co Ltd Any malfunction or damage attributable to the use in an environment not speci...

Страница 4: ...ries see below all exist If damage or defects are found on the product contact your dealer Note The accessories are not waterproof The supplied alkaline batteries are used to check operation thus it i...

Страница 5: ...n this case it satisfies the requirements of the Directive 2006 66 EC for the object chemical This product should not be disposed of as unsorted household waste Your correct disposal of WEEE waste bat...

Страница 6: ...o provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not...

Страница 7: ...tal protection use period in years It does not indicate a product guarantee period It guarantees that the product will not cause environment pollution nor serious influence on human body and property...

Страница 8: ...accordance with SJ T 11364 GB T 26572 Denotes that the amount of the hazardous substance contained in all of the homogeneous materials used in the component is below the limit on the acceptable amount...

Страница 9: ...riellen Umgebung k nnen die elektromagnetischen St rungen eventuell zu Produktfehlfunktionen f hren Um dieses Produkt unter solchen Umst nden verwen den zu k nnen muss der Benutzer ggf angemessene Ma...

Страница 10: ...sono soggetti a modifiche senza preavviso Ambiente di installazione Questo prodotto non stati progettati per essere utilizzati in ambienti industriali secondo la norma EN61326 1 In un ambiente indust...

Страница 11: ...0 1 Categor a de sobretensi n II Nivel de contaminaci n 2 POL Informacje dotycz ce bezpiecze stwa Przed przyst pieniem do u ytkowania tego produktu nale y dok adnie zapozna si z niniejsz instrukcj aby...

Страница 12: ...d Installatieomgeving Dit product is niet bedoeld voor gebruik in een industri le omgeving zoals gedefinieerd in EN 61326 1 In een industri le omgeving kan de elektromagnetische interferentie de werki...

Страница 13: ...f water and then consult a doctor Harmful chemicals The internal solution of pH electrode is highly concentrated potassium chloride 3 33 mol L KCl If the internal solution comes in contact with the sk...

Страница 14: ...For Your Safety XII CAUTION Do not remove or scratch the external label of the battery Doing so could cause injury to hands and fingers...

Страница 15: ...anual the instrument provides dust proof and waterproof performance When replacing the batteries while connected to the AC adapter or during the RS 232C communication the instrument does not have the...

Страница 16: ...tery together with a used battery Do not use a fully charged nickel metal hydride battery together with a partially charged battery Do not attempt to charge a non rechargeable battery Environmental co...

Страница 17: ...cessary points for correct operation and notifies the important points for handling the product This indicates the part where to refer for information This indicates reference information Original lan...

Страница 18: ...ing date 2 Display 3 Operation key 5 Basic operation 6 Changing the operation mode 6 Switching the displays 7 Changing the measurement parameter 8 Using the backlight 9 Entering numeric values 10 Meas...

Страница 19: ...ration and inspection data 47 Deleting calibration data 49 Printing measured values and calibration data 50 Transferring saved data to a PC 56 Operating the instrument from an external device 57 Using...

Страница 20: ...ity error pH 75 ERR No 0005 Electrode sensitivity error DO 75 ERR No 0006 Maximum calibration points exceeded 76 ERR No 0007 Cannot identify standard solution 76 ERR No 0008 Calibration interval error...

Страница 21: ...measurement glass electrode 85 pH standard solutions at various temperatures 86 ORP measurement 87 Dissolved oxygen measurement 88 Salinity concentration correction 89 Air pressure correction 89 Satu...

Страница 22: ...M E M O...

Страница 23: ...c operation method of each part Names of each part 2 Instrument 2 Identification of manufacturing date 2 Display 3 Battery level display 4 Operation key 5 Basic operation 6 Changing the operation mode...

Страница 24: ...ured in 2016 January No Name Function 1 Display Displays the measured value and set value and so on 2 Operation keys Used for instrument operation 3 Electrode connector Connects the BNC connector of t...

Страница 25: ...lay area Displays the currently set measurement parameter This is displayed in the main screen and the sub screen respectively 7 Main screen channel icon Displays the channel of the main screen 8 HOLD...

Страница 26: ...lay area Displays the unit for the measurement parameter and the display item This is displayed in the main screen and the sub screen respectively No Name Function Battery level is high Battery level...

Страница 27: ...m the measurement mode to the setting mode Starts repeatability inspection after calibration is complete Changes from the setting mode to the measurement mode without reflecting changes POWER key Turn...

Страница 28: ...data or setting mode is available only from the measurement mode When changing to a different mode first change to the measurement mode and then change to the desired mode Icon Name Function Measurem...

Страница 29: ...the main screen and the sub screen In the measurement mode pressing the keys can switch the channels between the main screen and the sub screen When performing calibration or setting switch the displ...

Страница 30: ...arameters For measurement an electrode corresponding to the measurement parameter is required In the measurement mode the measurement parameter can be changed by pressing the key This operation is ava...

Страница 31: ...acklight by pressing the key If the backlight is not operated for 5 minutes it automatically turns off To turn it off manually press the key again while the backlight is on Note Turning on the backlig...

Страница 32: ...ntering numeric values When entering numeric values to make various settings and set a calibration value you can change the selected digit using the keys and increment or decrement the value 0 to 9 us...

Страница 33: ...calibration 20 pH standard solution setting is NIST or USA 20 Inspecting repeatability 23 pH standard solution setting is CUST 24 Performing measurement 27 mV ORP measurement 28 Setting the instrument...

Страница 34: ...d solution for the measurement parameter If not prepare the standard solution by yourself or purchase it Are there any items that should not be wet or stained around the instrument Depending on the op...

Страница 35: ...n the battery cover on the back of the instrument clockwise to lock the battery cover Note Do not replace the batteries in a dusty place or with wet hands Dust or moisture could get inside the instrum...

Страница 36: ...with force when the connector does not match the socket When not using the AC adapter close the AC adapter connector cover While connected to the AC adapter the instrument does not have the dust proof...

Страница 37: ...nd time of saved data becomes incorrect Refer to Displaying saved data page 45 1 Press the key to enter the setting mode 2 Press the keys to select the MAINT maintenance setting and then press the key...

Страница 38: ...reparing electrodes Use the following procedure to correctly connect the electrode to the instrument 1 Insert the electrode connector by fitting its groove with the connector socket pin of the instrum...

Страница 39: ...libration using the value matched to the standard solution temperature only when the standard solution setting is NIST and USA However the function does not convert the pH value according to the tempe...

Страница 40: ...ration default NIST Set the standard solution used for calibration With this instrument you can choose from 3 types NIST USA and CUST the standard solution other than NIST and USA Set according to the...

Страница 41: ...5 C Standard solution type Description NIST Japanese specification Set to use the standard solution of the Japanese specification Standard solution icon USA USA specification Set to use the standard s...

Страница 42: ...a page 47 Deleting calibration data page 49 pH standard solution setting is NIST or USA This section describes the procedure for two point calibration of NIST pH 4 and 7 as a general calibration examp...

Страница 43: ...rent measured value display appears 8 Check that the pH value is stable while the pH electrode is immersed in the standard solution then press the key Stabilization judgment starts and the HOLD icon b...

Страница 44: ...ectrode status After calibration is complete the current pH electrode status is diagnosed from the calibration result Use this information for maintenance of the electrode Display Description Referenc...

Страница 45: ...solution filler port of the pH electrode If calibration is performed with the port closed the internal solution does not flow and the measurement value is not stabilized Make sure to keep the port ope...

Страница 46: ...ipe it with filter paper or tissue paper 3 Open the internal solution filler port of the pH electrode If calibration is performed with the port closed the internal solution does not flow and the measu...

Страница 47: ...e at least 3 cm from the tip of the pH electrode 7 Press the key and enter the standard solution value for the second point 8 While the pH electrode is immersed in the standard solution press the key...

Страница 48: ...ctrode status is diagnosed from the calibration result Use this information for maintenance of the electrode Display Description Reference Both ERR No are not displayed Electrode sensitivity 93 to 100...

Страница 49: ...ation 3 Immerse at least 3 cm from the tip of the pH electrode in the sample solution In order to flow the internal solution into the sample solution immerse the liquid junction in the sample solution...

Страница 50: ...the temperature display default ATC Automatic temperature measurement function can be used by using combination electrode equipped with a temperature sensor or connecting a temperature compensation e...

Страница 51: ...easurement and the relative value measurement Absolute value measurement mode The measured value of electromotive force is displayed Relative value measurement mode The measured value of electromotive...

Страница 52: ...unction in the sample solution surely 4 While the electrode is immersed in the sample solution press the key Stabilization judgment starts and the HOLD icon blinks When the value is stabilized the HOL...

Страница 53: ...function During calibration compensating for the change in dissolved oxygen due to temperature change by measuring the temperature of the air when air calibration is performed or the standard solution...

Страница 54: ...the ATC automatic temperature compensation or the MTC manual temperature compensation and then press the key 4 If you select the MTC enter the temperature to be compensated for and then press the key...

Страница 55: ...s not contain saline matter set to 0 0 PPT 1 Press the key to change the setting mode 2 Press the keys to select the SAL salinity correction setting and then press the key 3 Select the numeric setting...

Страница 56: ...d to set the air pressure of the measurement location to the instrument before calibration to correct the pressure influence and then perform measurement 1 Press the key to enter the setting mode 2 Pr...

Страница 57: ...tion with JIS K0101 JIS K0102 before 2015 and JIS K0803 select Pre Saturated DO levels in water at various temperature of each standard is shown the section of technical note 1 Press the key to enter...

Страница 58: ...Performing air calibration This section describes the method of air one point calibration Note Air calibration must be performed in clean air If air calibration is performed in a location subject to d...

Страница 59: ...nks When the value is stabilized the HOLD icon changes from the blinking state to the lit state and the calibrated value is displayed the calibrated value differs depending on the conditions because i...

Страница 60: ...olution Use an air pump to bubble pure water or deionized water in a container for about an hour to create oxygen saturated condition 3 Press the key to enter the calibration mode 4 Press the key to c...

Страница 61: ...least 6 cm from the tip of the DO electrode To maintain oxygen saturated status continue bubbling until calibration is finished Note When using an electrode 9551 20D or 9551 100D immerse at least 9 c...

Страница 62: ...y by the instrument Also the order of calibration is free If calibration of any standard solution is performed again in the calibration mode only the value of calibrated solution is updated If you cha...

Страница 63: ...t 6 cm from the tip of the DO electrode in the sample solution In order to immerse the temperature sensor equipped with the electrode in the sample solution immerse it at least 6 cm of the sample solu...

Страница 64: ...splay value change for 10 seconds is less than 0 03 mg L and temperature change is less than 2 0 C Oxygen concentration display value change for 10 seconds is less than 0 1 and temperature change is l...

Страница 65: ...latest inspection data 48 Deleting calibration data 49 Printing measured values and calibration data 50 Transferring saved data to a PC 56 Operating the instrument from an external device 57 Using th...

Страница 66: ...measurement mode except during the automatic hold measurement 1 While the data to save is displayed press the key to enter the data mode 2 Select IN data saving and press the key Saved data is displa...

Страница 67: ...n the internal memory 1 Press the key to enter the data mode 2 Press the keys to select OUT display saved data and then press the key Press the keys to change the measurement data and press the keys t...

Страница 68: ...setting mode 2 Press the keys to select the MAINT maintenance setting and then press the key 3 Press the keys to select the DATCLR delete saved data and then press the key 4 Select YES to delete the s...

Страница 69: ...the latest calibration data 1 Press the key to enter the data mode 2 Press the keys to select CAL pH or ION display calibration data and then press the key The electrode status based on the calibratio...

Страница 70: ...tion data and then press the key Displays the repeatability value the absolute value of the difference between the measured value and standard solution value Display Description Reference GOOD Electro...

Страница 71: ...ss the keys to select the CALCLR delete calibration data and then press the key 4 Press the keys to select the measurement parameter to delete and then press the key 5 Select YES to delete the calibra...

Страница 72: ...ng displaying the data you want to save Use the printer cable Options page 92 to connect the printer unit with the instrument beforehand If the automatic data memory is set to ON you cannot print out...

Страница 73: ...serial number Elect status GOOD Electrode status based on calibration result Offset 0 7 mV Asymmetry potential of calibration data Sensitivity Sensitivity of calibration data pH 4 01 6 86 98 9 Date 20...

Страница 74: ...0000 Sample ID number Inst model D 75 Instrument model Suffix G is not printed Inst SN KL1TSN36 Instrument serial number Elect status GOOD Electrode status based on calibration result Memory Num 0001...

Страница 75: ...ure value and temperature setting pH 6 86 7 6 mV Measurement potential 25 1 C ATC Temperature value and temperature setting Inspection before use pH 6 85 7 8 mV Measurement potential at time of repeat...

Страница 76: ...is not printed Inst SN KL1TSN36 Instrument serial number Calibration data Date 2013 09 01 Calibration date Time 09 00 Calibration time Inspection before use Repeatability 0 01 Repeatability of calibr...

Страница 77: ...ibration time CAL OK Calibration result 25 0 C ATC Temperature value and temperature setting SAL Coef 35 0 PPT Salinity coefficient Pres Coef 1013 hPa Air pressure coefficient Printout format Descript...

Страница 78: ...D 70 refer to the FD 70 instruction manual which you can download from our website as well The required PC specifications and recommended PC specifications for using the FD 70 are shown in the followi...

Страница 79: ...urs and the online mode does not start up and as a result RS 232C communication cannot be performed Also when the transfer format is changed turn OFF the power of the instrument and PC and then reboot...

Страница 80: ...tomatic data save function the data saved until just before the batteries run out Replace the batteries and check the data 1 Press the key to enter the setting mode 2 Press the keys to select the AT L...

Страница 81: ...he key starts saving the data when the setting is ON Pressing the key again stops the data saving process During automatic data saving measurement data is displayed for one second each time a measurem...

Страница 82: ...the data is saved in the internal memory the ID number entered in this setting is saved together with the data 1 Press the key to enter the setting mode 2 Press the keys to select the ID ID number set...

Страница 83: ...th this function set an error is displayed immediately When the error is displayed performing calibration clears the error 1 Press the key to enter the setting mode 2 Press the keys to select the PERI...

Страница 84: ...3 Press the keys to select the MAINT maintenance setting and then press the key 4 Press the keys to select the TEMP temperature calibration setting and then press the key 5 Enter the set temperature a...

Страница 85: ...external device 1 Press the key to enter the setting mode 2 Press the keys to select the MAINT maintenance setting and then press the key 3 Press the keys to select the AT OFF automatic power off set...

Страница 86: ...r test printing As a result of test printing if the printout is as shown below the printer unit is operating correctly 1 Press the key to enter the setting mode 2 Press the keys to select the MAINT ma...

Страница 87: ...erature calibration data is also initialized 1 Press the key to enter the setting mode 2 Press the keys to select the MAINT maintenance setting and then press the key 3 Press the keys to select the IN...

Страница 88: ...M E M O...

Страница 89: ...ohol The instrument is made of solvent resistant materials but that does not mean it is resistant to all chemicals Do not dip the instrument in strong acid or alkali solution or wipe it with such solu...

Страница 90: ...slow Store in a moist atmosphere Follow the steps below to properly store the electrode 1 Wash the electrode well with pure water or deionized water to remove sample completely and close the internal...

Страница 91: ...e water or deionized water Daily storage of the electrode If the electrode becomes dry the response will slow Store in a moist atmosphere Follow the steps below to properly store the electrode 1 Wash...

Страница 92: ...ectrode internal solution If the surface of the metal electrode is dirty wipe it gently with a soft material such as absorbent cotton moistened with alcohol or a neutral cleaning solution or immerse i...

Страница 93: ...he membrane in order to prevent deterioration of the membrane Daily storage of the DO electrode Follow the steps below to store the electrode correctly 9520 10D 1 Wash the DO electrode well with pure...

Страница 94: ...M E M O...

Страница 95: ...tes 0004 Asymmetric potential error The asymmetric potential of the electrode is out of the range of 45 mV 0005 Electrode sensitivity error The electrode sensitivity is either 105 or more or 85 or les...

Страница 96: ...ue without using the automatic hold function The electrode is dirty Clean the electrode The electrode is cracked Replace the electrode The responsive glass membrane of the electrode has been dry for a...

Страница 97: ...erse to at least 3 cm from the tip of the electrode There is a problem with the standard solution Use new standard solution Cause How to solve problem The electrode is dirty Wash the electrode The ele...

Страница 98: ...ard solution Use new standard solution Settings about the standard solution do not match the instrument Check if the instrument settings and the specifications of the standard solution are compatible...

Страница 99: ...ere is a problem with the printer unit connection Check the printer connection and connect the instrument and printer again The defect of the printer Consult your dealer Cause How to solve problem Sav...

Страница 100: ...higher than the level of the sample Cause How to solve problem There is a motor or other device causing electrical interference Measure at a place where no influence from induction is given Ground al...

Страница 101: ...ortant to select an electrode that is appropriate for the sample Consult your dealer To confirm an electrode that is appropriate for the sample check the pH electrode selection guide in our catalogue...

Страница 102: ...ough to cover liquid junction The electrode must be immersed up to the liquid junction As a guide immerse to at least 3 cm from the tip of the electrode The electrode cable is broken Replace the elect...

Страница 103: ...nish the internal solution of the reference electrode until it is higher than the level of the sample Cause How to solve problem Power is not supplied Insert batteries or connect the AC adapter option...

Страница 104: ...t to full screen display Follow the steps below to check the display 1 Press the key to enter the setting mode 2 Press the keys to select the MAINT maintenance setting and then press the key 3 Press t...

Страница 105: ...erature humidity 0 C to 45 C 80 or less in relative humidity no condensation Power AAA alkaline batteries LR03 or AAA Ni MH rechargeable batteries 2 AC adapter 100 V to 240 V 50 60 Hz 0 37 A option Di...

Страница 106: ...00 0 Resolution 0 1 Measurement parameter Item Selection item Setting range Default values Common Temperature setting Automatic ATC Manual MTC Automatic ATC Temperature input value 0 0 C to 100 0 C 25...

Страница 107: ...of electromotive force The liquid inside the glass electrode usually has a pH 7 If one measures the electromotive force generated at the electrode membrane the pH of the sample can be found by calcul...

Страница 108: ...2 Saturated calcium hydroxide solution 0 1 666 4 003 6 984 9 464 13 423 5 1 668 3 999 6 951 9 395 13 207 10 1 670 3 998 6 923 9 332 13 003 15 1 672 3 999 6 900 9 276 12 810 20 1 675 4 002 6 881 9 225...

Страница 109: ...solution can only be determined by equation What is important here is that ORP is determined by the ratio of activity between the oxidant Fe3 and the reductant Fe2 using the equation aFe2 aFe3 In act...

Страница 110: ...anode and cathode is closed Oxygen that diffuses through the oxygen permeable membrane causes the following chain reaction to occur in the cathode and allows current to flow in the external circuit Wh...

Страница 111: ...occurs in the above equation This means that even if a DO tip is immersed in pure water that is saturated with air or in an aqueous solution containing salt the output current will not change which gi...

Страница 112: ...6 95 6 12 45 16 9 87 26 8 11 36 6 84 7 12 14 17 9 67 27 7 97 37 6 73 8 11 84 18 9 47 28 7 83 38 6 62 9 11 56 19 9 28 29 7 69 39 6 52 10 11 29 20 9 09 30 7 56 40 6 41 Temp C Saturated DO mg L Temp C S...

Страница 113: ...ebsite This page presents the knowhow we have cultivated over many years for example how temperature affects measured values and what to do when you want to measure various samples By registering as a...

Страница 114: ...Part name Part number Remarks AC adapter 3200647413 With 6 plug adapters Plain paper printer Printer USA 120 V 3014030146 Printer cable sold separately Printer EU 230 V 3014030147 Printer cable 301403...

Страница 115: ...t jp For any questions regarding this product please contact your local agency or inquire from the following website http global horiba com contact_e index htm 31 Miyanonishi cho Kisshoin Minami ku Ky...

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