Vzor MAPK-302E User manual

MAPK-302E
DISSOLVED
OXYGEN
METER
Operation Manual
Nizhny Novgorod
2010
АЯ 7
4

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VZOR will appreciate any suggestions and comments aimed
at 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 [phone], 412-29-40
E-mail: [e-mail]
Website: www.vzornn.com

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C O N T E N T S
1 DESCRIPTION AND OPERATION ....................................................................... 4
1.1 Purpose ............................................................................................................ 4
1.2 Basic parameters ............................................................................................. 4
1.3 Specifications ................................................................................................... 6
1.4 Product components ........................................................................................ 7
1.5 Description and operation ................................................................................ 7
1.6 Measuring instruments, tools and accessories .............................................. 10
2 INTENDED USE .................................................................................................. 11
2.1 Operating limitations ...................................................................................... 11
2.2 Safety ............................................................................................................. 11
2.3 Pre-starting procedures ................................................................................. 11
2.4 Measurement procedure ................................................................................ 17
2.5 Functional check ............................................................................................ 20
2.6 Troubleshooting ............................................................................................. 20
3 MAINTENANCE ................................................................................................... 27
4 DELIVERY SET ................................................................................................... 27
APPENDIX A. Solubility of 100 % humidity air oxygen in distilled water,
depending on the temperature ............................................................................ 28

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1 DESCRIPTION AND OPERATION
1.1 Purpose
1.1.1 Product name and designation
MAPK-302E dissolved oxygen analyzer
TU 4215-022-39232169-2008.
1.1.2 The analyzer has been designed to measure the dissolved oxygen
concentration and water temperature.
1.1.3 The analyzer may be used to measure the mass concentration of wa-
ter-dissolved oxygen and temperature of surface, waste and drinking water, and
may be employed by fish farms; chemical, biotechnological and food industries;
educational institutions and ecology branches.
1.1.4 The type of analyzer:
 amperometric;
 with external poling voltage;
 with one sensitive element;
 with a digital LCD display;
 with automatic temperature compensation;
 with 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 during calibration.
1.2 Basic parameters
1.2.1 By resistance to climatic effects, the analyzer version group is B4 in
accordance with GOST 12997-84.
1.2.2 By resistance to mechanical effects, the analyzer version is L1 in ac-
cordance with GOST 12997-84.
1.2.3 The converter unit degree of protection ensured by the casing is IP30
in accordance with GOST 14254-96.
1.2.4 By resistance to atmospheric pressure, the analyzer version group is
Р1 in accordance with GOST 12997-84 (atmospheric pressure between 84 and
106,7 kPa).
1.2.5 Analyzed water parameters:
 temperature, °С ………………………………………………….…... 0 to +50;
 pressure, MPa, max ……...………………………………..….……....… 0,05;
 salt content, g/dm3 ……...………………………..………..……..…... 0 to 40;

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 рН ……………………………………………………….…….….......... 4 to 12;
 rate of water flow relative to sensor membrane, cm/s ….…………...…... 5.
1.2.6 Permissible concentrations of unmeasured components:
 dissolved ammonia, mg/dm3, max ….…...…………………..……….... 40,0;
 dissolved phenol, mg/dm3, max ….………….………………..…………. 0,2;
 dissolved sulphuretted hydrogen, mg/dm3, max …………….…………. 0,5;
 dissolved chlorine, mg/dm3, max …………….…………………….……. 4,0.
1.2.7 Operating conditions:
 ambient air temperature, °C ……………………………...………... +1 to +50;
 relative air humidity at 35 °С and lower temperatures without moisture
condensation, %, max …………………….………................................................. 80;
 atmospheric pressure, kPa (mm hg) ……………..………..….. 84,0 to 106,7
(630 to 800).
1.2.8 The analyzer is calibrated by air of 100 % humidity.
Calibration temperature range, °С ………………………………..… +15 to +35.
1.2.9 The analyzer is powered from 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 Table 1.1 below.
Table 1.1
Name and designation of component versions
Overall dimensions,
mm, max
Weight,
kg, max
ВР29.01.000-01 converter unit 84×160×38 0,30
ВР29.02.000-01 oxygen sensor
(without cable)

14×115 0,10
ВР29.03.000 protective cap

20×90 0,05
1.2.13 GOST 12997-84 conditions for carriage in shipping containers:
 temperature, °С ……………………...............…………..….…. – 20 to +50;
 relative air humidity at 35 °С, % ............................…….....………...… 95±3;
 5-35 Hz sinusoidal vibration with a 0,35 mm shift amplitude in the direction
marked “Top” on the package.

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1.3 Specifications
1.3.1 DOC (dissolved oxygen concentration) measuring range at an analyte
temperature of 20 °С, mg/dm3 ..………………………………….……..….. 0 to 10,00.
The upper limits of DOC measuring range, depending on the analyte tem-
perature, are shown in Table 1.2.
Table 1.2
t, °C 0 5 10 15 20 25 30 35 40 45 50
DOC,
mg/dm3 17,45
15,29
13,48
12,10
10,00
9,85
8,98
8,30
7,69
7,12
6,59
1.3.2 Limits of the analyzer allowable basic absolute error in DOC measure-
ment at an analyte temperature of (20,0±0,2) °С and ambient temperature of
(20±5) °С, mg/dm3 ……………………………….…........................... ±(0,050+0,04С),
where С, here and hereafter, is a measured DOC value in mg/dm3.
1.3.3 Limits of the analyzer allowable additional absolute error in DOC
measurement due to a change in the ambient temperature, by each ±5 °С from the
normal temperature (20,0±0,2) °С, within the operating temperature range from 0
to +50 °С, mg/dm3 ……………………………………….….…………………. ±0,012C.
1.3.4 Limits of the analyzer allowable additional absolute error in DOC
measurement due to a change in the ambient temperature by each ±10 °С from
the normal temperature (20±5) °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 additional absolute error in DOC
measurement at surplus pressure of analytical environment up to 0,2 MPa,
mg/dm3……………………………………………………………………………… ±0,1C.
1.3.6 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……….…………………………………………....................... ±(0,050+0,04C).
1.3.7 Analyte temperature measuring range, °С ……...……............. 0 to +50.
1.3.8 Limits of the analyzer allowable basic absolute error in analyte temper-
ature measurement at an ambient temperature of (20±5) °С, °C ….……...…... ±0,3.
1.3.9 Limits of the analyzer allowable basic absolute error in analyte temper-
ature measurement due to a change in the ambient temperature by each ±10 °С
from the normal temperature (20±5) °С, within the operating temperature range
from +1 to +50 °С, °С …….....………………………..…………….…………..….. ±0,1.
1.3.10 Limit of the permissible value of the analyzer readout setting time t0.9
in DOC measurement, min …………..……….………………………….…………… 1.
1.3.11 Limit of the permissible value of the analyzer readout setting time tу in
DOC measurement, min ……….…………......................…………..……………….. 2.
1.3.12 Limit of the permissible value of the analyzer readout setting time t0.9
in analyte temperature measurement, min ……………………….………….………. 1.

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1.3.13 Limit of the permissible value of the analyzer readout setting time tу in
analyte temperature measurement, min ………………………………………….….. 3.
1.3.14 Analyzer oscillatory readings in DOC measurement for 8 h, mg/dm3,
max …………………………………………………..……………...….. ±(0,025+0,02C).
1.4 Product components
The analyzer comprises:
 converter unit;
 oxygen sensor with a 5 m connecting cable;
 protective cap.
1.5 Description and operation
1.5.1 General analyzer data
The MAPK-302E 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/dm3 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/dm3. 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.
Note – The DOC values may be displayed in % O2 (in % saturation) with the
least significant digit value of 0,1 % O2.

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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
DOC in the analyte.
The analyzer features a temperature sensor (platinum thermal resistor) to
measure temperature and to automatically compensate for the temperature de-
pendence of the oxygen sensor signal. The temperature sensor signal is supplied
to the ADC input.
The ADC converts signals of the oxygen sensor and the temperature sensor
into codes incoming the microcontroller.
The microcontroller processes the codes received and shows the information
on the digital LCD display.
1.5.3 Analyzer design
The analyzer is shown in Fig.1.1а.
а b
Fig. 1.1
1
3
15
2
4
5
12
11
13
14
8
9
10
7
16
17
MODE
CAL
ENTER
6

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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 current time
(in off state);
 button 4.
The back panel of the converter unit features a battery compartment cover.
Located on top of the converter unit is sealed cable entry 5 for oxygen sen-
sor 2.
For transportation use protective cap 6.
Fig.1.1b shows the oxygen sensor design.
The sensor’s basic functional elements are platinum cathode 7 and silver
anode 8. Secured to cathode 7 with caprone thread 9 is teflon film 10. The mem-
brane and rubber bushing form membrane assembly 11 fitted over bushing 12 and
filled with electrolyte 13. The temperature sensor is enclosed in case 14. Protective
bushing 15 covers the sensor electrode portion and is screwed into cable bushing
16 (Fig.1.1а).
Cable 17 connects the sensor electrode assembly to the converter unit.
Protective cap 6 is made of plastic, it is cylindrical form with slots and should
be put on protective bushing 15.
1.5.4 Functions of buttons on the converter unit 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 right half of the indicator. If indicating in %
saturation, in the right side of display is shown the sign “%”;
 the CAL button selects the analyzer calibration mode. When pressed se-
quentially, the button causes the characters с0 (analyzer reset) and с1 (atmos-
pheric air calibration) to light up on the display;
 the ENTER button confirms the selected calibration mode and completes
calibration.

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1.6 Measuring instruments, tools and accessories
1.6.1 The following tools and accessories, which are not included in the de-
livery set, will be additionally required for maintenance of the analyzer:
 2 mm cross screwdriver;
 В-1-250 beaker;
 КН-100-19/26 flask;
 hydroquinone, chemically pure;
 sodium or potassium hydroxide, chemically pure.
Instead of hydroquinone, chemically pure and sodium or potassium hydrox-
ide, chemically pure the following reagents may be used:
 sodium sulphite Na2SO4, chemically pure;
 potassium permanganate KMnO4, chemically pure.