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Vzor MARK-302T Скачать руководство пользователя страница 7

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1.3.13 Analyzer oscillatory readings in DOC measurement for 8 h, mg/dm

3

,

max ……………………………………………………………..….….. ±(0,0015+0,02C).

1.4 Product components

The analyzer comprises:



converter unit;



oxygen sensor with a 2 m connecting cable;



flowing vat.

1.5 Description and operation

1.5.1 General analyzer data

The MARK-302Т dissolved oxygen analyzer is a small-size microprocessor

device designed to measure the mass concentration of water-dissolved oxygen
(DOC) and the analyte temperature.

The DOC values measured in mg/dm

3

or temperature measured in Celsius

degrees (depending on the measuring mode) are displayed on the readout device
– a digital LCD display (“the display”). The minimum value of the least significant
digit for DOC measurement is 0,001 mg/dm

3

. The least significant digit value for

temperature measurement is 0,1 °С.

The analyzer is calibrated by atmospheric air of 100 % humidity with auto-

matic adjustment for atmospheric pressure during calibration.

Adjustment for atmospheric pressure during the analyzer calibration by at-

mospheric air is provided by a built-in atmospheric pressure sensor.

1.5.2 Analyzer operating principle

The analyzer uses an amperometric sensor operating as a closed-type

polarographic cell. The electrodes are submerged in an internal electrolyte solution
which is separated from the analyte by a membrane penetrable for oxygen but im-
penetrable  for  liquid  and  water  vapor.  From  the  analyte,  oxygen  diffuses  through
the membrane into a thin layer of electrolyte between the electrodes and the mem-
brane  and  undergoes  an  electrochemical  reaction  on  the  surface  of  the  cathode
which is polarized by external voltage applied cross the electrodes.  In the process,
the  sensor  generates  a  DC  signal  which  is  at  a  fixed  temperature  proportional  to

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Содержание MARK-302T

Страница 1: ...MARK 302Т DISSOLVED OXYGEN METER Operation Manual Nizhny Novgorod 2010 АЯ 74 ...

Страница 2: ...product quality improvement If you have any trouble with the instrument performance please contact us in writing or by phone Postal address 603106 Russia Nizhny Novgorod POB 253 Telephone 7 831 229 65 67 412 29 40 E mail market vzor nnov ru Website www vzornn com ...

Страница 3: ...ion 7 1 6 Measuring instruments tools and accessories 9 2 INTENDED USE 10 2 1 Operating limitations 10 2 2 Safety 10 2 3 Pre starting procedures 10 2 4 Measurement procedure 15 2 5 Functional check 18 2 6 Troubleshooting 19 3 MAINTENANCE 26 4 DELIVERY SET 26 APPENDIX A Solubility of 100 humidity air oxygen in distilled water depending on the temperature 27 ...

Страница 4: ...utions and ecology branches 1 1 5 The type of analyzer amperometric with external poling voltage with one sensitive element with a digital LCD display with automatic temperature compensation with flow type dip sensor with automatic calibration when the sensor is placed in the oxygen envi ronment air at temperatures varying between 15 С and 35 С with automatic adjustment for atmospheric pressure du...

Страница 5: ...rom a 2 2 3 4 V DC self contained power supply two AA type alkaline batteries 1 2 10 Power consumption at a rated voltage of 2 8 V mW max 10 1 2 11 The analyzer retains its characteristics within the ranges set in the analyzer specifications after replacement of the sensor s spare parts batteries and calibration 1 2 12 The overall dimensions and weights of analyzer components are summarized in Tab...

Страница 6: ...С within the operating temperature range from 1 to 50 С mg dm3 0 001 0 002C 1 3 5 Limits of the analyzer allowable absolute error in DOC measurement at an analyte temperature coinciding with the calibration temperature which varies be tween 15 С and 35 С at an ambient temperature of 20 5 С mg dm3 0 003 0 04C 1 3 6 Analyte temperature measuring range С 0 to 50 1 3 7 Limits of the analyzer allowable...

Страница 7: ...surement is 0 1 С The analyzer is calibrated by atmospheric air of 100 humidity with auto matic adjustment for atmospheric pressure during calibration Adjustment for atmospheric pressure during the analyzer calibration by at mospheric air is provided by a built in atmospheric pressure sensor 1 5 2 Analyzer operating principle The analyzer uses an amperometric sensor operating as a closed type pola...

Страница 8: ...n the digital LCD display 1 5 3 Analyzer design The analyzer is shown in Fig 1 1а Converter unit 1 has a sealed plastic housing and is designed to convert sig nals from oxygen sensor 2 and display measurement data The front panel of the converter unit features indicator screen 3 designed to display a measured DOC value or temper ature depending on the chosen measuring mode battery charge and curre...

Страница 9: ...t front panel The analyzer front panel features the following buttons as shown in Fig 1 1а the button for analyzer power on off When the analyzer is energized the display shows the measured DOC or temperature value the MODE button enables the DOC or temperature measuring mode with the display showing the measured DOC or temperature value and mg dm3 or С character respectively coming on in the righ...

Страница 10: ...perated by personnel who are familiar with this manual and chemical handling safety rules in accordance with GOST 12 1 007 76 and GOST 12 4 021 75 2 2 2 The analyzer meets the requirements of Safety Class III to GOST R 52319 2005 The rated supply voltage varies between 2 2 and 3 4 V No protective earthing is required 2 2 3 By electromagnetic compatibility the analyzer meets the requirements of GOS...

Страница 11: ...e MODE and ENTER buttons to set the hour value press the CAL button to complete time setting the analyzer goes into the time indication mode Switch on the analyzer and check if the display shows DOC or temperature readings in mg dm3 or С respectively IMPORTANT ALWAYS OBSERVE polarity when installing batteries Failure to meet this condition may damage the analyzer When the display shows the sign re...

Страница 12: ...responding to the table of 100 humidity air oxygen solubility for analyzer measured temperatures with allowance for the atmospheric pressure at the time of calibration for example c8 38 mg dm3 Wait at least 8 s before pressing the ENTER button once again The donЕ caption will appear shortly on the screen and the с symbol will go out The analyzer will go into the measuring mode which means that pre...

Страница 13: ... the analyzer reading in 30 min it should be within 3 mkg dm3 If the above steps fail to cause the analyzer readings in the null solution to decrease to the desired values this suggests either bad quality of the null solution bad reagents or a fault in the analyzer see section 2 6 Troubleshooting Calibration of the analyzer should then be performed subject to para 2 3 4 or 2 3 5 If any error chara...

Страница 14: ...nalyzer will display DOC readings corre sponding to the table of 100 humidity air oxygen solubility for analyzer measured temperature with allowance for the atmospheric pressure at the time of calibration e g c8 38 mg dm3 3 Wait at least 8 s before pressing ENTER once again The donЕ caption will briefly appear on the display and the analyzer will go into the measuring mode It means the outside air...

Страница 15: ...e for zero adjustment e g с 002 mg dm3 3 Wait at least 8 s before pressing ENTER once again The donЕ caption will briefly appear on the display and the analyzer will go into the measuring mode The analyzer display will indicate a DOC value in the null solution after analyzer zero setting 0 000 if 0 003 mg dm3 Z0 0 003 mg dm3 Z0 0 003 if Z0 0 003 mg dm3 Z0 0 003 if Z0 0 003 mg dm3 Note Analyzer zer...

Страница 16: ...se bends on the sensor membrane or in the wa ter line knee may substantially invalidate the results One of the signs showing the presence of air bubbles is that the analyzer oxygen readings will not settle while dropping slowly and continuously Such a process caused by the air oxygen being washed out from air bubbles may last 1 2 hours To eliminate air bubbles in the sampler line it is recommended...

Страница 17: ...e when the readings of 0 003 mg dm3 are obtained It is rec ommended to perform this operation once a month The 0 003 mg dm3 reading recorded time may be used for measurement i e take reading when this time expires IMPORTANT while operating the analyzer keep the sensor membrane wet The sensor should be kept in water dur ing intervals between measurements There is a good reason to store the sensor i...

Страница 18: ... 0 0 0041 4 0 0 0060 15 0 0 0055 25 0 0 0050 35 0 0 0046 45 0 0 0041 5 0 0 0060 16 0 0 0055 26 0 0 0049 36 0 0 0045 46 0 0 0040 6 0 0 0060 17 0 0 0054 27 0 0 0049 37 0 0 0045 47 0 0 0040 7 0 0 0060 18 0 0 0054 28 0 0 0049 38 0 0 0044 48 0 0 0039 8 0 0 0058 19 0 0 0053 29 0 0 0048 39 0 0 0044 49 0 0 0039 9 0 0 0058 20 0 0 0053 30 0 0 0048 40 0 0 0043 50 0 0 0038 10 0 0 0058 Exemplary calculation of...

Страница 19: ...rdance with the clauses given below and Fig 1 1 and 2 4 Table 2 2 Trouble symptoms Probable cause Remedy 1 With power on no read ings are displayed Poor battery contact Open the battery com partment and clean con tacts Supply voltage below acceptable level Para 2 3 1 Replace bat teries 2 With power on all or ran dom segments and charac ters illuminate on the screen Dead batteries Para 2 3 1 Replac...

Страница 20: ...n the screen Ruptured membrane Para 2 6 4 Replace the membrane assembly Contaminated electro lyte Para 2 6 3 Replace electrolyte Moisture inside the converter unit Dry the converter unit for 3 4 days Ruptured teflon film Para 2 6 4 Replace tef lon film Analyzer sensor off the outside air Position the sensor in air 7 Extended time of re sponse to oxygen concen tration variations Contaminated mem br...

Страница 21: ...through the flowing vat at 400 to 800 cm3 min 2 6 2 Membrane cleaning The sensor membrane may be cleaned with a wad of alcohol soaked cotton The sensor membrane may also be submerged in a weak solution 2 of sulfuric acid for about 1 hour and then wash it in running water 2 6 3 Filling the sensor with electrolyte electrolyte replacement As it is supplied in a dry state without electrolyte the senso...

Страница 22: ... platinum cathode The membrane SHALL NEVER separate from the cathode After a certain period of service the sensor may have the volume of electro lyte reducing due to leakage through pinholes or ruptures in the membrane which necessitates electrolyte replacement Cable bushing Protective bushing Bushing Remove Syringe filled with electrolyte Membrane assembly Case Capron thread Teflon film Membrane ...

Страница 23: ...e man ner Damaged film should be replaced Once the teflon film is removed check the sensor electrode to see if they look as follows platinum cathode 1 Fig 1 1b sealed in a glass tube should be clean silver anode 2 coiled over the tube should be gray If necessary clean the electrodes with a wad of alcohol soaked cotton IMPORTANT NEVER use any abrasive for cleaning electrodes 2 6 4 2 Damaged teflon ...

Страница 24: ...vessel with Solution 2 and hold it there also for 1 hour IMPORTANT NEVER PLACE the silver anode in the above solutions wash the sensor with distilled water Then proceed to para 2 6 4 2 Note After cleaning the platinum electrode and performing the steps as per para 2 6 4 2 and 2 3 3 2 3 4 the analyzer when placed in the null solution can display low negative values over a period from 24 to 48 hours...

Страница 25: ... mg dm3 with zero shift 2 6 6 2 Average steepness setting 1 Switch off the analyzer 2 Press the CAL button and keeping it pressed switch on the analyzer Af ter a sound signal release the CAL button The screen will display с2 Press the CAL button again The screen will display с3 3 Press the ENTER button The donЕ capture will briefly appear on the screen and the analyzer will go into the measurement...

Страница 26: ...e than 24 hours This operation ensures the highest response rate of the instrument in DOC measurements When the conditions described in para 2 5 are fulfilled the analyzer meets the specifications listed in para 1 3 4 DELIVERY SET 4 1 The delivery set is shown in Table 4 1 Table 4 1 Description Quantity 1 MARK 302Т dissolved oxygen analyzer with sensor cable length 2 m 1 2 Flowing vat 1 3 Spare pa...

Страница 27: ...10 08 10 06 10 04 10 02 10 00 9 98 9 96 9 94 9 92 9 90 16 9 87 9 85 9 83 9 81 9 79 9 77 9 75 9 73 9 71 9 69 17 9 66 9 64 9 62 9 60 9 58 9 56 9 54 9 52 9 50 9 49 18 9 47 9 45 9 43 9 41 9 39 9 37 9 36 9 34 9 32 9 30 19 9 28 9 26 9 24 9 22 9 21 9 19 9 17 9 15 9 13 9 11 20 9 09 9 08 9 06 9 04 9 02 8 01 8 99 8 97 8 95 8 93 21 8 91 8 89 8 87 8 86 8 85 8 83 8 81 8 80 8 78 8 76 22 8 74 8 73 8 71 8 69 8 68...

Страница 28: ... 13 43 6 12 6 11 6 10 6 09 6 08 6 07 6 06 6 05 6 04 6 04 44 6 03 6 02 6 01 6 00 5 99 5 98 5 97 5 96 5 95 5 94 45 5 93 5 92 5 92 5 91 5 90 5 89 5 88 5 87 5 86 5 85 46 5 84 5 83 5 82 5 82 5 81 5 80 5 79 5 78 5 77 5 76 47 5 75 5 74 5 74 5 73 5 72 5 71 5 70 5 69 5 68 5 67 48 5 66 5 66 5 65 5 64 5 63 5 62 5 61 5 60 5 59 5 59 49 5 58 5 57 5 56 5 55 5 54 5 53 5 52 5 52 5 51 5 50 50 5 49 5 48 5 47 5 47 5 ...

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