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

3
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

4
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.

5
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.

6
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.

7
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.

9
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

10
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

11
1.5.5 Measurement mode
1.5.5.1 Measurement displays
Display screens in the mode of DOC measurement in ppb and in ppm are
shown in Fig. 1.2 and 1.3, respectively.
Fig. 1.2 Fig. 1.3
Display screen in the mode of DOC measurement in saturation % is shown
in Fig 1.4.
Figures may be different.
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 − 100 %;
 date (day and month) and current time. The date and time are set up as
described in 1.5.8 (menu option DATE TIME);
 measured DOC value. To move from the mode of DOC measurement in
ppb and ppm to the mode of DOC measurement in saturation % the key is
used;
− temperature of analyzable fluid, °С;
− the value of salt content in the analyzable fluid entered by a user.
MODE
▲
28 Sep. 10:58
3.55 ppm
20.5

С
24 Sep. 13:56
125.0 ppb
22.5

С
SALT
25
ppt
SALT
25
ppt
соль
25 г/дм3
24 Sep. 14:06
55.3 %
20.5

С
SALT
25
ppt

12
Display illumination is turned on and off using key .
According to 1.5.8 (menu option ADDITIONAL SETTINGS), a time period in
seconds when illumination is on if any of the keys is depressed, may be set up.
If the display shows intermittent messages or dashes rather than DOC or
temperature values and the audible overload signal is on, refer to 1.5.9.
1.5.6 Measurement results saving in the scratchpad
To enter measurement results in the 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 the key .
If there are no folders made by a user, data shall be entered in the SHARED
FOLDER.
The display shown in Fig. 1.5 shall appear for 2 s, and then the analyzer
shall change the current mode to the measurement mode.
Fig. 1.5
The selected folder shall contain the following:
 date and time of measurement;
 temperature of analyzable fluid;
 DOC value measured in ppb (in ppm) or in saturation % according to the
selected operating mode.
If the pad is filled to capacity, on entering data the display shall show the
message "SAVING IS IMPOSSIBLE, SCRATCHPAD IS OVERFILLED".
RECORD
ENTER
MODE
▲
MENU
▼
RECORD
ENTER
EXIT
SHARED FOLDER
- - - - - - - - - - - - - - - - - - - - - - - - -
RECORDED!
►24 Sep. 13:56 36.1°С
О2 = 199.9 ppb

13
1.5.7 View of entries in the scratchpad
To view entries, depress key for 0.5 s in the measurement mode.
The display LIST OF FOLDERS shall show the list of folders made by a
user. The SHARED FOLDER comes first in the list. The other folders shall appear
in the order they have been made. The intermittent cursor shall automatically
appear against the folder that has been requested last.
If space on the screen is not enough for the whole list, a scroll bar shall
come up on the right side of the screen. The dark color square on the scroll bar
shall show an approximate location of the visible part of the list relative to the
whole list.
Using the keys and move the cursor to the folder needed and
press the key .
If the 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 measurement data, arrows at the
top and bottom of the scroll bar shall show where (at the top or bottom of the list)
the measurement data invisible on the screen are to be found.
To scroll the data list use the keys and . If the keys are depressed
for more than 1 s, the list shall be automatically scrolled in the respective direction.
Since on scrolling the list it moves itself, the cursor shall always remain
against the message shown on the screen.
If entry in the pad has been made in the mode of DOC measurement in ppm,
the display shown in Fig. 1.6 shall come up.
If entry in the pad has been made in the mode of DOC measurement in ppb,
the display shown in Fig. 1.7 shall come up.
If entry in the pad has been made in the mode of DOC measurement in
saturation %, the display shown in Fig. 1.8 shall come up.
Fig. 1.6
MODE
▲
MENU
▼
MODE
▲
MENU
▼
MODE
▲
MENU
▼
RECORD
ENTER
READ
►
SHARED FOLDER
- - - - - - - - - - - - - - - - - - - - - - - - - -
►05 Jan. 15:30 25.1°С
О2 = 3.56 ppm

14
Fig. 1.7 Fig. 1.8
If there are no entries in the folder, the respective message shall come up. If
the cursor is moved to the message needed and key is depressed, the
display shown in Fig. 1.9 shall come up. The entry shall open and memorized DOC
value shall be additionally recalculated in the units different from the memorized
units. Also, memorized salt content shall be shown.
Fig. 1.9
Using either of the keys and move the cursor against DELETE
RECORD and depress the key . 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 and return to
the previous display, press the key .
1.5.8 MENU mode
The analyzer parameters shall be viewed and changed in the MENU mode.
MODE
▲
MENU
▼
RECORD
ENTER
RECORD
ENTER
RECORD
ENTER
EXIT
SHARED FOLDER
- - - - - - - - - - - - - - - - - - - - - - - - - -
►05 Jan. 15:30 25.1°С
О2 = 199.9 ppb
SHARED FOLDER
- - - - - - - - - - - - - - - - - - - - - - - - - -
►05 Jan. 15:30 25.1°С
О2 = 2.50 % sat.
0
5
Jan.
15:30
25.1°
С
О2 = 199.9 ppb
(2.50 % sat.)
SALT 25 ppt
►EXIT
DELETE RECORD

15
To move from the measurement mode to the MENU mode, depress the key
for 0.5 s. MENU display is shown in Fig. 1.10.
Fig. 1.10
To exit from any display of MENU, depress the key .
To move the marker "►" in the menu, the keys and are used. If
these keys are depressed 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 ► DATE TIME menu command
► DATE TIME is the menu command to enter date and time.
The DATE TIME display is shown in Fig. 1.11.
Fig. 1.11
Date and time shall be entered separately in any order: date, month, hours,
and minutes.
Moving to the left and to the right is carried out using the keys , .
In this case the parameter that may be changed starts flickering.
Parameters shall be changed using the keys , .
In open DATE TIME display the clock stops, and it is actuated on exit from
this display.
READ
►
CAL
◄
MENU
▼
MODE
▲
MENU
▼
MODE
▲
MENU
▼
RECORD
ENTER
MENU
►DATE TIME
METER PARAMETERS
ADDITIONAL SETTINGS
SCRATCHPAD EDITOR
SALINITY
EXIT
DATE TIME
04 mar. 10:30

16
1.5.8.2 ► METER PARAMETERS menu command
► METER PARAMETERS is the menu command to view parameters of the
electrode system.
On selection of this menu command, the display shown in Fig. 1.12 shall
come up.
Fig. 1.12
The display shall show the following parameters of the probe DOC
measurement channel:
 probe current in μA measured on calibration against atmospheric air and
reduced to temperature of 20 С and normal atmospheric pressure of 101.325 kPa
("PROBE CURRENT");
 probe readings in ppb with the probe located in the "zero" solution on
calibration ("SHIFT").
Parameters of the probe in good working condition shall lie in the following
ranges:
 "PROBE CURRENT"  from 1 to 10 μA;
 "SHIFT"  from minus 2.9 to plus 2.9 ppb.
If the cursor is moved against "PROBE CURRENT" and key is
depressed, the display shall show the time of the previous analyzer calibration as
show in Fig. 1.13.
Fig. 1.13
If the cursor is moved against SHIFT and the key is depressed, the
display in Fig. 1.14 with the flickering number shall come up.
RECORD
ENTER
RECORD
ENTER
METER
PARAMETERS
► PROBE CURRENT 2.5 μA
SHIFT +2.3 ppb
INITIAL SETTINGS
PROBE CURRENT
3.4 μA
LAST CALIBRATION
24 sep.

17
Fig. 1.14
Using the keys and set the shift value required. Shift setting
makes it possible to reach the analyzer zero readings holding the probe in a fresh
"zero" solution for at least 40 min. The figure changes in the range from minus 2.9
to plus 2.9 ppb.
Depress the key and "SAVED!" message shall appear for 2 s at the
screen bottom, and the analyzer shall return to the METER PARAMETERS
display.
If the cursor is moved against the INITIAL SETTINGS command, and the
key is depressed, the display shown in Fig. 1.15 shall come up.
Fig. 1.15
Depress the key for 2 s and the display shown in Fig. 1.16 shall come
up, and the analyzer shall change the current display to the METER
PARAMETERS display.
Fig. 1.16
MODE
▲
MENU
▼
RECORD
ENTER
RECORD
ENTER
RECORD
ENTER
INITIAL SETTINGS
PROBE CURRENT 5 μA
SHIFT 0.0 ppb
ENTER INITIAL
SETTINGS?
METER
PARAMETERS
► PROBE CURRENT 5 μA
SHIFT 0.0 ppb
SAVED!
SHIFT
+2.4 ppb

18
1.5.8.3 ► ADDITIONAL SETTINGS menu command
► ADDITIONAL SETTINGS is the menu command used to set the time of
automatic deactivation and time of automatic illumination as well as to turn on or off
the option reminding about calibration.
On selection of this menu command, the display shown in Fig. 1.17 shall
come up.
Fig 1.17
►AUTOBACKLIGHT is the sub-menu command used to set illumination
time of 10 s or 30 s once any of the keys is depressed.
On selection of this sub-menu command, the display shown in Fig. 1.18 shall
come up.
Fig. 1.18
If the cursor is moved against OFF, automatic illumination shall not work.
Select parameter needed and depress the key.
Note − At supply voltage of 2.4 V and below display illumination does not
work.
►AUTOSHUTDOWN is the sub-menu command intended to set
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. 1.19 shall
come up.
RECORD
ENTER
ADDITIONAL SETTINGS
AUTOBACKLIGHT OFF
AUTOSHUTDOWN OFF
REMINDER OFF
AVERAGING 30 s
AUTOBACKLIGHT
► OFF
10 s
30 s

19
Fig. 1.19
If the cursor is moved against OFF, automatic deactivation shall not work.
Select the parameter needed and depress the key.
► REMINDER is the sub-menu command intended to switch off the
calibration remind command.
On selection of this sub-menu command, the display shown in Fig. 1.20 shall
come up.
Fig. 1.20
If the cursor is moved against ON, and the key is depressed, on
activation of the meter the display shown in Fig. 1.21 shall come up (if a time
period after the previous analyzer calibration exceeds 10 days).
On depressing any key the analyzer shall go over to the measurement
mode.
If calibration has not been carried out, on next actuation of the analyzer
calibration remind shall appear again.
Fig. 1.21
RECORD
ENTER
RECORD
ENTER
CALIBRATION REMIND
OFF
► ON
AUTOSHUTDOWN
► OFF
15 min
30 min
15
Oct.
12:12
LAST CALIBRATION
14 Sep.
CALIBRATION
RECOMMENDED

20
► AVERAGING is the sub-menu command used to set time for averaging
the measured DOC value.
On selection of this sub-menu command the display shown in Fig. 1.22 shall
come up.
Fig. 1.22
If the cursor is moved against OFF, averaging of the measured DOC value
shall not work.
Select parameter needed and depress the key.
1.5.8.4 ► SCRATCHPAD EDITOR menu command
► SCRATCHPAD EDITOR is the display shown in Fig. 1.23.
Fig. 1.23
1 CLEAR FOLDER display is shown in Fig. 1.24.
Names of folders may be different.
Fig. 1.24
RECORD
ENTER
SCRATCHPAD
EDITOR
► CLEAR FOLDER
CLEAR ALL FOLDERS
CREATE FOLDER
DELETE FOLDER
CLEAR FOLDER
►SHARED FOLDER
POINT 1
POINT 2
POINT 5
POINT 3
POINT 4
AVERAGING TIME
OFF
15 s
► 30 s
60 s
120 s