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1 DESCRIPTION AND OPERATION 

 
 

1.1 Purpose 

 
 
 
1.1.1 Product name and identification 

 

pH-meter with a combined electrode: 
MAPK-903 pH-meter

.

 TU 4215-027-39232169-2007 

 
pH-meter with individual electrodes: 
MAPK-903/1 pH-meter

.

 TU 4215-027-39232169-2007  

 
1.1.2 Purpose 
pH-meter  is  used  to  measure  hydrogen  ion  activity  index  (pH),  aqueous 

solution temperature and electromotive force (U). 

1.1.3 Applications 
pH-meter is used in heat engineering, various industries and agriculture. 
1.1.4 Type of measuring convertor unit: 

  working with the sensitive element to measure pH; 

  without galvanic separation of input and output; 

  as a portable small-size unit with an integrated display; 

  with  measurement  results  feed  via  a  USB  port  to  a  personal  computer 

(PC); 

  with a submersible sensitive element; and 

  with electronic pre-amplifier integrated with the transducer. 

Types of electrodes in various pH-meter versions are shown in Table 1.1. 

Table 1.1 − Types of applicable electrodes 

pH-meter 

version 

Type of applicable electrodes 

No in 

National 

Register 

Manufacturer 

MAPK-903  ЭСК-10601/7(К80.7) 

combined glass electrode 

16767-03 

IT Measuring 

Equipment NPO LLC, 

Moscow, Russia 

ЭСК-10601/4(К80.7) 
combined glass electrode 

16767-03 

ЭСКЛ-08М 
combined laboratory glass 
electrode 

6530-99 

Gomel Measuring 

Instrumentation 

Factory RUP, 

Gomel, 

Belarus Republic 

ЭСКЛ-08М.1 
combined laboratory glass 
electrode 

6530-99 

201020/51-10-04-22-120/000 
combined pH-electrode with gel 
filler 

− 

JUMO GmbH & CO 

Fulda Germany 

Summary of Contents for Mark-903

Page 1: ...MAPK 903 pH METER Operation Manual Nizhny Novgorod 2011 АЯ 74 ...

Page 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 ...

Page 3: ...28 2 1 Operating limitations 28 2 2 Safety Precautions 28 2 3 pH meter preliminary operating procedures 28 2 4 Measurement procedure 33 2 5 Troubleshooting 36 3 MAINTENANCE 39 4 DELIVERY SET 39 ATTACHMENT A pH of standard buffer solutions versus temperature 40 ATTACHMENT B pH of highly dilute alkaline and acid solutions as a function of analyzable fluid temperature computed on the basis of the dat...

Page 4: ...it with an integrated display with measurement results feed via a USB port to a personal computer PC with a submersible sensitive element and with electronic pre amplifier integrated with the transducer Types of electrodes in various pH meter versions are shown in Table 1 1 Table 1 1 Types of applicable electrodes pH meter version Type of applicable electrodes No in National Register Manufacturer ...

Page 5: ...eter 1 2 Main parameters 1 2 1 By resistance to climatic load the pH meter version belongs to B4 group according to GOST 12997 84 1 2 2 By resistance to mechanical action the pH meter version belongs to L1 group according to GOST 12997 84 1 2 3 By protection from environmental exposure the pH meter except electrodes version belongs to IP65 category according to GOST 14254 96 1 2 4 By resistance to...

Page 6: ...tive humidity at temperature of plus 35 С and below without moisture condensation maximum 80 atmospheric pressure kPa mm of Hg from 84 0 to 106 7 from 630 to 800 1 2 7 The pH meter is powered up from a self contained power supply with voltage 2 4 to 3 4 V two AA alkaline dry cells or two nickel metal hydride batteries AA 1 2 8 Power consumption at rated supply voltage of 3 0 V mW maximum with disp...

Page 7: ... 10601 7 К80 7 glass electrode 12 170 0 10 ЭС 10601 4 К80 7 glass electrode ЭСр 10101 3 0 К80 4 reference electrode ЭСр 10103 3 0 К80 4 reference electrode ЭСЛ 43 07СР glass laboratory electrode 13 160 ЭВЛ 1М3 1 auxiliary laboratory electrode 1 2 11 Conditions of transportation in shipping crates as per GOST 12997 84 temperature С from minus 5 to plus 50 air relative humidity at 35 С 95 sinusoidal...

Page 8: ...easurements at ambient air temperature of 20 5 С mV 0 5 1 3 9 The range of transducer allowable complementary absolute accuracy on U measurements caused by deviation of ambient air temperature from the normal one 20 5 С per each 10 С within the operating temperature range from plus 5 to plus 50 С mV 0 3 1 3 10 Transducer pH measuring range pH from 0 000 to 15 000 1 3 11 The range of transducer all...

Page 9: ...nt results in an electronic scratchpad According to the version the pH meter may use a combined electrode or individual electrodes measuring electrode and reference electrode Note To monitor water chemistry at heat engineering facilities based on data in MU 34 70 114 85 Document the pH meter may reduce pH value pHt measured at temperature t to pH25 value that corresponds to the value at temperatur...

Page 10: ...U and temperature indicate battery charge date time and navigate in the display menu and keys 3 The convertor unit rear panel bears a cover of the dry cell compartment The upper end face of the MAPK 903 pH meter convertor unit carries a tight cable entry 4 from temperature sensor 7 jack 5 for connection of the combined electrode 8 and jack 6 for connection to PC Unlike MAPK 903 pH meter the jack 5...

Page 11: ...11 а b Figure 1 1 CAL MODE READ EXIT RECORD ENTER MENU CAL MODE READ EXIT RECORD ENTER MENU 1 2 3 5 6 8 9 10 11 7 7 4 MAPK 903 pH meter MAPK 903 pH meter 4 5 6 ...

Page 12: ...surement out of available modes see 1 5 8 MENU MEASURING MODES The key is to be depressed for 0 5 s when working with the electronic scratchpad and display menu to move upward in a line The key is used in the measurement mode to move from measurement mode to the mode of viewing data entered into the electronic scratchpad It is to be held depressed for 0 5 s when working with the electronic scratch...

Page 13: ... in pH measurement mode is shown in Fig 1 2 Display screen in pH25 measurement mode is shown in Fig 1 3 Display screen in U measurement mode is shown in Fig 1 4 Figures displayed may be different Fig 1 2 Fig 1 3 Fig 1 4 The display screen shows the following dry cell charge The number of bars in the symbol shows the dry cell charge level as follows one bar 25 two bars 50 three bars 75 four bars 10...

Page 14: ... or temperature values and the audible overload signal is on refer to 1 5 9 1 5 6 Measurement results saving in the electronic scratchpad To enter measurement results in the electronic scratchpad depress key for 0 5 s The display shall show the list of folders made by a user including SHARED FOLDER Using and keys move the cursor against the folder required for instance SHARED FOLDER and depress th...

Page 15: ... the key If keys and are depressed for more than 1 s the list shall be automatically scrolled in the respective direction If there are no folders made by the user SHARED FOLDER shall automatically open The display shall show measurements saved in the folder according to date and time The intermittent cursor shall automatically move to the last entry If space on the screen is not enough for measure...

Page 16: ...y Data on the screen shall be deleted The RECORD DELETED message shall appear on the screen for 2 s If the cursor is moved against EXIT and the key is depressed the displays shown in Fig 1 6 1 8 come up Pad shall be edited including clearing of folders making new folders folder deletion as described in 1 5 8 SCRATCHPAD EDITOR menu command To go over to the measurement mode or exit from any display...

Page 17: ...ssed for more than 1 s the cursor shall automatically start moving in the respective direction To select the menu command needed move the marker to the entry and press the key 1 5 8 1 PROBE PARAMETERS PROBE PARAMETERS is the menu command to view parameters of the electrode system On selection of this menu command the display shown in Fig 1 11 shall come up Fig 1 11 MENU MODE MENU MODE MENU RECORD ...

Page 18: ...surement modes or remove them from the list On selection of this menu command the display shown in Fig 1 12 shall come up Fig 1 12 Move the cursor to the command required and select the mode needed using key 1 5 8 3 ADDITIONAL SETTINGS ADDITIONAL SETTINGS is the menu command intended to select the needed value of the pHi isopotential point and set the time of pH meter automatic deactivation and au...

Page 19: ... sub menu command intended to set pH meter deactivation time of 15 min or 30 min once any of the keys is depressed On selection of this sub menu command the display shown in Fig 1 15 shall come up If the cursor is moved to OFF command pH meter may not be deactivated automatically Choose required parameter and press the key Fig 1 15 RECORD ENTER RECORD ENTER ADDITIONAL SETTINGS SETTING рНi 7 00 AUT...

Page 20: ...d and depress key Note At supply voltage of 2 4V and below display illumination does not work 1 5 8 4 SCRATCHPAD EDITOR SCRATCHPAD EDITOR is the display shown in Fig 1 17 Fig 1 17 1 CLEAR FOLDER display is shown in Fig 1 18 Names of folders may be different The cursor is always moved to SHARED FOLDER first To clear a folder with records paste it using the cursor and press the key RECORD ENTER RECO...

Page 21: ... in the same manner 2 CLEAR ALL FOLDERS display is shown in Fig 1 20 Fig 1 20 Press the key All folders are clear The display shall show NO RECORDS message for 2 s and the pH meter shall go over to the SCRATCHPAD EDITOR display RECORD ENTER RECORD ENTER CLEAR FOLDER SHARED FOLDER POINT 1 POINT 2 POINT 5 POINT 3 POINT 4 SHARED FOLDER 25 jan 15 30 t 25 8 С U 255 3 mV рН 2 508 рН25 2 508 CLEAR FOLDER...

Page 22: ...move to DELETE SYMBOL command Using the key delete as many symbols as needed Depress the key the alphabet shall appear again and the folder name may be entered on To save the folder you created move the cursor to SAVE FOLDER command and depress the key The pH meter shall go over to the SCRATCHPAD EDITOR display If the scratchpad contains a folder bearing the name which is entered on pressing the k...

Page 23: ... for instance in Fig 1 24 Fig 1 24 If a folder contains no entries the display shall show NO RECORDS message Press the key The FOLDER DELETED message shall appear on the screen for 2 s and the pH meter shall go over to DELETE FOLDER display Other folders except SHARED FOLDER may be deleted in the same manner 1 5 8 5 DATE TIME DATE TIME is the menu command to enter date and time The DATE TIME displ...

Page 24: ...ed using the keys In open DATE TIME display the clock stops and it is actuated on exit from this display 1 5 9 Warning displays On appearing displays shown in Fig 1 26 1 28 refer to 2 5 of the Operation Manual Troubleshooting Table 2 1 The display shown in Fig 1 26 comes up when analyzable fluid temperature exceeds 70 0 С Simultaneously an audible signal comes on Fig 1 26 READ CAL MODE MENU 24 sep...

Page 25: ...Fig 1 27 The display shown in Fig 1 28 comes up when analyzable fluid temperature is below 0 С Fig 1 28 1 5 10 Error displays The display shown in Fig 1 29 comes up if on calibration the buffer solution is not identified Fig 1 29 24 sep 13 56 12 508 рН t t max С 24 sep 13 56 12 508 pH t t min С WARNING CALIBRATION ERROR ...

Page 26: ... display shown in Fig 1 32 comes up error No 3 in the event of pH meter program failure Move to the SETTING рНi sub menu command and enter рНi value required according to the electrode type 7 00 6 70 or 4 00 Fig 1 32 The display shown in Fig 1 33 error No 4 comes up in the event of pH meter program failure Carry out pH meter calibration using electrodes as described in 2 3 3 2 Fig 1 33 ROM ERROR D...

Page 27: ...nt mode On viewing this entry in the scratchpad the display shall show an ERROR message 1 6 Measuring instruments tools and appliances The pH meter maintenance shall additionally require the following tools and appliances not included into the delivery set 2 mm screwdriver 2 cm3 syringe to fill an electrode with electrolyte К 2 1000 50 flask В 1 250 beaker КСl solution of 3 mol dm3 concentration Н...

Page 28: ...measurements in solutions containing hydrofluoric acid or salts thereof and substances that form deposits and films on electrode surfaces as well as operation and storage of dry electrodes 2 1 6 Avoid PC output short circuit 2 2 Safety Precautions 2 2 1 Electric safety of operating personnel is ensured due to use of self contained DC power supply of voltage from 2 2 to 3 4 V 2 2 2 The pH meter is ...

Page 29: ...energized 3 IMPORTANT To prevent date and time resetting and loss of data in the electronic scratchpad batteries or dry cell are to be replaced within a 30 s period Nickel metal hydride batteries shall be charged with 5 V voltage and analyzer connected to the PC USB port 2 3 2 To make electrode electrodes available 2 3 2 1 Make electrode electrodes available in compliance with the electrode certif...

Page 30: ...electrode electrodes and temperature sensor in distilled water first in two vessels in succession and then in the first buffer solution against which calibration is to be undertaken which exhibits pH 1 65 at solution temperature of 25 0 0 2 С 2 Power up the pH meter Press the key The display shown in Fig 2 1 shall come up Fig 2 1 3 Place pH electrode electrodes and temperature sensor in the first ...

Page 31: ...hall be pasted Once readings become stable the meter shall be pasted the display shown in Fig 2 4 shall come up Fig 2 4 6 Press the key The display shown in Fig 2 5 shall come up The pH meter shall enter the calibration mode against the second buffer solution exhibiting pH 9 18 at the solution temperature of 25 0 0 2 С Fig 2 5 RECORD ENTER WARNING CALIBRATION ERROR CALIBRATION No 1 1 650 pH 23 0 С...

Page 32: ...uffer solution Press the key The second buffer solution shall be identified The display shown in Fig 2 6 shall come up Fig 2 6 10 If pH value of the second buffer solution is not identified automatically the display shown in Fig 2 3 shall come up Refer to 2 5 of the Operation Manual Troubleshooting Table 2 1 11 If buffer solution pH value is identified automatically it shall appear and the meter i...

Page 33: ...ration according to 2 3 Prior to measurements open the electrode filling hole and remove the protective cap Wash an electrode electrodes and temperature sensor in distilled water and immerse into the analyzable solution On pH measurements an electrode is to be immersed in a solution at least 16 mm deep Electrolyte level in an electrode on measurements is to be above the analyzable solution level O...

Page 34: ...e protective case protects electrodes in measurements and in pH meter haulage It is supplied as agreed to by a customer with any type of electrodes except ЭСКЛ 08М and ЭСКЛ 08М 1 combined laboratory glass electrodes Moisten an electrode electrodes and the sensor in distilled water and place them in the protective case in the sockets as shown in Fig 2 10 Prior to measurements screw out the protecti...

Page 35: ...rough module stabilizes water flow from a sampler ensures metering and visual control of water flow rate to the combined electrode It is intended to measure рН25 in water with specific conductance over 0 2 μS cm At conductance below 0 2 μS cm measurement accuracy is not regulated pH is reduced to рН25 in the range from plus 5 to plus 50 To make measurements easy the FM 901 903 flow through module ...

Page 36: ...another one Defective electrode one of electrodes Replace electrode 4 Temperature measured under normal use differs from actual value by more than 0 3 С Defective temperature sensor To be repaired at factory 5 WARNING CALIBRATION ERROR message on the screen pH of the buffer solution is different from pH 1 65 or pH 9 18 Prepare fresh buffer solution Cable rupture or poor contact in the electrode ca...

Page 37: ... shall show computed values of electrode system parameters for selected value of the isopotential point S is electrode system slope pНi and Еi are the coordinates of electrode system isopotential point versus pНi value compliant with type of electrodes used and defined in ADDITIONAL SETTINGS menu IMPORTANT Once the pH meter is de energized and then turned on the PROBE PARAMETERS menu shall show pa...

Page 38: ... pHi are the coordinates of electrode system isopotential point given in the PROBE PARAMETERS menu according to Fig 2 11 2 13 pH is a simulated value of hydrogen ion activity in the range from 0 to 10 pH St is the electrode system slope mV pH St value is found from the equation St 0 1984 273 16 t where t is pH meter readings at temperature of С ...

Page 39: ...n of components Version MAPK 903 MAPK 903 1 1 ВР48 01 000 convertor unit with ВР48 01 400 temperature sensor 1 1 2 ЭСК 10601 7 К80 7 combined glass electrode 1 3 ЭСК 10601 4 К80 7 combined glass electrode 1 4 ЭСКЛ 08М combined laboratory glass electrode 1 5 ЭСКЛ 08М 1 combined laboratory glass electrode 1 6 201020 51 10 04 22 120 000 combined pH electrode with gel filler 1 7 ЭС 10601 7 К80 7 glass...

Page 40: ...queous 3 8064 g dm 3 Na 2 CO 3 NaHCO 3 sodium carbonate 2 6428 g dm 3 sodium carbonate acidic 2 0947 g dm 3 1 65 3 56 4 01 6 86 9 18 10 00 0 5 10 15 20 25 30 37 40 50 60 70 80 90 95 1 638 1 642 1 644 1 646 1 648 1 649 1 650 1 653 1 660 1 67 1 69 1 72 1 73 3 556 3 549 3 544 3 542 3 544 3 553 3 57 3 60 3 63 3 65 4 000 3 998 3 997 3 998 4 001 4 005 4 011 4 022 4 027 4 050 4 080 4 12 4 16 4 21 4 24 6 ...

Page 41: ...ighly dilute alkaline and acid solutions as a function of analyzable fluid temperature computed on the basis of the data from MU 34 70 114 85 6 00 7 00 8 00 9 00 10 00 0 5 10 15 20 25 30 35 40 45 50 р Н t Темп ература pH t Temperature ...

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