Vzor MAPK-303T User manual

MAPK-303T
DISSOLVED
OXYGEN
METER
Operation Manual
Nizhny Novgorod
2010
АЯ 74

2
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, PB 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 characteristics ........................................................................................ 4
1.3 Technical data .................................................................................................. 6
1.4 Analyzer components ...................................................................................... 7
1.5 Design and operation ....................................................................................... 7
1.6 Measuring instruments, tools and appliances ................................................ 27
2 INTENDED USE .................................................................................................. 28
2.1 Operating limitations ...................................................................................... 28
2.2 Safety Precautions ......................................................................................... 28
2.3 Analyzer pre-staring procedures .................................................................... 28
2.4 Measurement procedure ................................................................................ 41
2.5 Inspection of condition ................................................................................... 44
2.6 Troubleshooting ............................................................................................. 44
3 MAINTENANCE ................................................................................................... 51
4 DELIVERY SET ................................................................................................... 51
ATTACHMENT A. SOLUBILITY OF 100%-HUMIDITY AIR OXYGEN IN
DISTILLED WATER DEPENDING ON TEMPERATURE ...................................... 52

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1 DESCRIPTION AND OPERATION
1.1 Purpose
1.1.1 Product name and identification
MAPK-303T dissolved oxygen analyzer
TU 4215-029-39232169-2008.
Analyzer application: highly sensitive measurements of dissolved oxygen
mass concentration (within microgram range) mostly on heat engineering facilities
to control deaerated water.
The analyzer can also be used for measurement of mass concentration of
water-dissolved oxygen and temperature of surface and waste water, drinking
water, in fish farms, flow processes, training processes and ecology.
1.1.2 Type of analyzer:
 amperometric;
 with external reference voltage;
 with a single sensitive element;
 with liquid crystal display plotter;
 with automated temperature compensation;
 with DOP-303Т flow submersible probe;
 with automatic calibration when the probe is located in oxygen
environment (air) at a temperature plus 15 to plus 35 С;
 with automatic atmospheric pressure correction on calibration.
1.2 Basic characteristics
1.2.1 By resistance to climatic load, the analyzer version belongs to B4
group according to GOST 12997-84.
1.2.2 By resistance to mechanical action, the analyzer version belongs to L1
group according to GOST 12997-84.
1.2.3 By resistance to atmospheric pressure, the analyzer version belongs to
P1 group according to GOST 12997-84 (atmospheric pressure from 84 to
106.7 kPa).
1.2.4 Parameters of analyzable water:
 temperature, С ….………………………………………………. 0 to plus 50;
 pressure, MPa, max …………………………………….……………….. 0.05;
 salt content, ppt ….………………………………..…………………... 0 to 40;
 рН ………………………………………………………….……........... 4 to 12;
 water flow velocity in the flow-through cell, cm3/min .…………. 400 to 800;
 water flow velocity relative to probe membrane, cm/s ………...…........... 5.

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1.2.5 Permissible concentrations of ingredients not to be measured:
 dissolved ammonia, ppm, max …....……………………………………. 40.0;
 dissolved phenol, ppm, max …………..…………………………………. 0.2.
1.2.6 Operating conditions:
 ambient air temperature, C ……………….……………… plus 1 to plus 50;
 ambient air relative humidity at a temperature of plus 35 С and below
without moisture condensation, %, max .…………………………………………… 80;
 atmospheric pressure, kPa (mm Hg) ..………..……………… 84.0 to 106.7
(630 to 800).
1.2.7 The analyzer is calibrated against air of 100 % humidity at a
temperature plus 15 to plus 35 С.
1.2.8 The analyzer is powered up from a self-contained DC power supply
with voltage from 2.2 to 3.4 V.
1.2.9 Analyzer power requirements at rated supply voltage of 2.8 V, mW,
max:
 with display illumination off …..……………………………………………. 20;
 with display illumination on ……………......…………….…..….……….. 300.
1.2.10 The analyzer retains in-spec characteristics after dry cell replacement
and calibration.
1.2.11 Dimensions and weight of analyzer components are shown in
Table 1.1.
Table 1.1
Identification of components
Maximum dimensions,
mm
Max weight,
kg
CU-303 convertor unit ВР47.01.000 65

130

28 0.12
DOP-303Т oxygen probe ВР47.02.000
(w/o cable)

16×115 0.12
1.2.12 Conditions of transportation in shipping crates under GOST 12997-84:
 temperature, С ...………………….……….................. minus 20 to plus 50;
 air relative temperature at 35 С, % ………………….………......…. (95±3);
 sinusoidal vibration of 5-35 Hz frequency, shift amplitude of 0.35 mm in
direction shown by the “Top” sign on a crate.
1.2.13 Safety requirements
1.2.13.1 Average time between failures, h, minimum ….……………... 20.000.
1.2.13.2 Mean recovery time, h, maximum …..………………………………. 2.
1.2.13.3 Analyzer average life span, years, minimum .…………………….. 10.
1.2.13.4 According to GOST 14254-96 the convertor unit protection level
ensured by enclosure is IP65.

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1.3 Technical data
1.3.1 Range of dissolved oxygen concentration (hereafter “DOC”)
measurements at analyzable fluid temperature of 20 С, ppm ...……... from 0 to 10.
The upper limit of DOC measurement range shall be governed by the
analyzable fluid temperature and is shown in Table 1.2.
Table 1.2
t,

C 0 5 10 15 20 25 30 35 40 45 50
DOC,
ppm 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 The range of analyzer allowable basic absolute accuracy when
measuring DOC at analyzable fluid temperature of (20.0 ± 0.2)С and ambient air
temperature of (20 ± 5) С, ppm ……………………….……….…… ± (0.003+0.04С),
where С hereinafter is DOC measured value in ppm.
1.3.3 The range of analyzer allowable complementary absolute accuracy
when measuring DOC governed by changes in analyzable fluid temperature per
each ± 5 С deviation from normal temperature (20.0 ± 0.2) С within the operating
temperature range from 0 to plus 50 °С, ppm …………...….……………… ± 0.012C.
1.3.4 The range of analyzer allowable complementary absolute accuracy
when measuring DOC governed by changes in analyzable fluid temperature per
each ±10 °С deviation from normal temperature (20.0 ± 0.2) С within the operating
temperature range from plus 1 to plus 50 °С, ppm ..................... ±(0.002 + 0.002C).
1.3.5 The range of analyzer allowable absolute accuracy when measuring
DOC at analyzable fluid temperature coincident with calibration temperature lying
within the temperature range from plus 15 to plus 35 С and at ambient air
temperature of (20 ± 5) С, ppm ..…………………………………. ± (0.003 + 0.04C).
1.3.6 Measuring range of analyzable fluid temperature, С ……. 0 to plus 50.
1.3.7 The range of analyzer allowable basic absolute accuracy on measuring
analyzable fluid temperature at ambient air temperature of (20 ± 5)С, С ….. ± 0.3.
1.3.8 The range of analyzer allowable complementary absolute accuracy on
measuring analyzable fluid temperature governed by changes in ambient air
temperature per each ± 10 С deviation from normal (20 ± 5) С temperature within
the operating range from plus 1 to plus 50 С, С ...…….…..…………………. ± 0.1.
1.3.9 Maximum allowable analyzer reading setting time t0.9 on DOC
measurements, min ……….…………………………………………………….….…... 2.
1.3.10 Maximum allowable analyzer reading setting time tу on DOC
measurements, min ………………………………………………………………….... 30.
1.3.11 Maximum allowable analyzer reading setting time t0.9 on measuring
analyzable fluid temperature, min ……...………………………………………..……. 1.
1.3.12 Maximum allowable analyzer reading setting time tу on measuring
analyzable fluid temperature, min ………..…………………………………….…….. 3.

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1.3.13 Instability of analyzer readings on DOC measurements for an 8-h
period, ppm, max ...……………………….……………................. ± (0.0015 + 0.02C).
1.3.14 When connected to a PC through a USB jack, the analyzer
communicates with the PC.
1.4 Analyzer components
MAPK-303Т dissolved oxygen analyzer is composed of:
 CU-303 convertor unit;
 DOP-303Т oxygen probe with a connecting cable 1.5 m long.
1.5 Design and operation
1.5.1 Analyzer general data
MAPK-303Т dissolved oxygen analyzer is a small-size microprocessor
instrument used to measure mass concentration of oxygen dissolved in water
(DOC), as well as temperature of water.
Measured temperature and DOC values in ppm or ppb (depending on the
DOC value) are shown on a digital liquid crystal display (hereafter “display”). The least
significant digit on measuring temperature is 0.1 С. The least significant digit on
measuring DOC is 0.1 ppb.
The analyzer makes it possible to enter the measurement results in a
scratchpad.
The analyzer is calibrated against atmospheric air of 100% humidity in view
of atmospheric pressure at the time of calibration.
To use atmospheric pressure data in analyzer calibration against
atmospheric air, a built-in atmospheric pressure sensor is used.
Note − The analyzer can be calibrated using State Standard Specimens of
Control Gas Mixtures with known content of oxygen in % vol. or against the
solution with known DOC in ppb.
The analyzer can read DOC in saturation percentage with the least
significant digit of 0.01%.

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1.5.2 Analyzer operating principle
To measure water-dissolved oxygen content, the analyzer is furnished with
amperometric probe working as a closed polarographic cell. Electrodes are
submerged in the internal electrolyte solution which is isolated from the
measurable fluid by a membrane permeable for oxygen and impermeable for the
liquid and water vapors. Oxygen from analyzable fluid penetrates through a
membrane and diffuses through a thin electrolyte layer between electrodes and the
membrane and undergoes an electrochemical reaction on the cathode surface
which is polarized by external voltage between electrodes. In this case the probe
generates a DC signal which at constant temperature is proportional to
concentration of oxygen dissolved in the controllable fluid.
To measure temperature and automatically compensate for temperature
dependence of the signal from the oxygen probe, the analyzer is furnished with a
temperature sensor (platinum thermal resistor). A signal from the temperature
sensor goes to the ADC input.
ADC converts signals from the oxygen and temperature sensors into codes
fed to the microcontroller.
The microcontroller shall process the codes and shows data on the liquid
crystal display plotter.
1.5.3 Analyzer design
The analyzer is shown in Fig. 1.1а.
The convertor unit 1 enclosed in a plastic tight casing, transforms signals
from the oxygen probe 2 into displayable measurement results and transmits data
to PC.
The convertor unit front panel carries:
 a display screen 3 to show measured DOC and temperature, dry cell
charge, date, time and navigate in the menu; and
 keys 4.
The convertor unit rear panel bears a cover of the dry cell compartment.
The upper end face of the convertor unit carries:
 a tight oxygen probe 2 cable entry 5; and
 a jack 6 for connection to PC.

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a b
Fig. 1.1
Fig. 1.1b shows the design of the oxygen probe.
Basic components of the probe include a platinum cathode 7 and a silver
anode 8. The cathode 7 bears a Teflon film 10 secured by nylon threads 9. The
membrane and the rubber bushing make the membrane assembly 11 put onto the
bushing and filled with electrolyte 13. The temperature sensor is nested in the
casing 14. The protective bushing 15 covers the probe electrode member and is
thread-joined with the cable sleeve 16.
The cable 17 connects the probe electrode member to the convertor unit.
1.5.4 Functions of keys on the convertor unit front panel
The analyzer uses non-locking keys.
The symbols on the light key space show their functions in DOC
measurement mode.
The symbols on the dark key space reflect their functions when working with
the scratchpad and display menu.
1
3
15
2
4
MAPK
303
ОXYGEN METER
6
5
12
11
13
14
8
9
10
7
16
17
CAL MODE
READ
EXIT
RECORD
ENTER
MENU

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The blue key is used to turn on and off the analyzer. It is to
be held depressed for 2 s.
The key is used:
– in measurement mode − to shift to the analyzer calibration
mode. It is to be held depressed for 0.5 s;
– when working with the scratchpad and display menu − to
move in a line leftward.
The key is used:
− in measurement mode − to select the mode of DOC
measurement in ppm (ppb) or saturation %. It is to be held
depressed for 0.5 s;
− when working with the scratchpad and display menu − to
move in a line upward.
The key is used:
– in measurement mode − to move from measurement
mode to the mode of data view entered into the scratchpad.
It is to be held depressed for 0.5 s;
– when working with the scratchpad and display menu − to
move in a line rightward.
The key is used:
– in measurement mode − to turn on and off display
illumination;
– when working with the scratchpad and display menu − to
exit from scratchpad and menu displays.
The key is used:
− in measurement mode − to enter the display menu. It is to
be held depressed for 0.5 s;
− when working with the scratchpad and display menu − to
move in a line downward.
The key is used:
− in measurement mode − to enter data into the scratchpad.
It is to be held depressed for 0.5 s;
− when working with the scratchpad and display menu − to
confirm selected parameters and operating modes.
CAL
READ
EXIT
MENU
RECORD
ENTER
MODE