Vzor Mark-903 User manual

MAPK-903
pH-METER
Operation Manual
Nizhny Novgorod
2011
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, POB 253
Telephone: + 7 (831) 229-65-67, 412-29-40
E-mail: market@vzor.nnov.ru
Website: www.vzornn.com

3
C O N T E N T S
1 DESCRIPTION AND OPERATION.................................................................................. 4
1.1 Purpose ..................................................................................................................... 4
1.2 Main parameters ....................................................................................................... 5
1.3 Technical data ........................................................................................................... 8
1.4 Apparatus components ............................................................................................. 9
1.5 Design and operation ................................................................................................ 9
1.6 Measuring instruments, tools and appliances ......................................................... 27
2 INTENDED USE ............................................................................................................ 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 data
from MU 34-70-114-85 .................................................................................................. 41

4
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

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Table 1.1 (Continue)
pH-meter
version
Type of applicable electrodes No in
National
Register
Manufacturer
MAPK-903/1
ЭС-10601/7(К80.7)
glass electrode 16393-03
IT Measuring
Equipment NPO LLC,
Moscow, Russia
ЭС-10601/4(К80.7)
glass electrode 16393-03
ЭСр-10101-3,0(К80.4)
reference electrode 17908-02
ЭСр-10103-3,0(К80.4)
reference electrode 17908-02
ЭСЛ-43-07СР
laboratory glass electrode 2875-98 Gomel Measuring
Instrumentation
Factory RUP,
Gomel,
Belarus Republic
ЭВЛ-1М3.1
laboratory auxiliary electrode 2189-99
Note − Types of electrodes used are specified on ordering pH-meter.
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 atmospheric pressure the pH-meter version belongs to
P1 group according to GOST 12997-84 (atmospheric pressure from 84 to
106.7 kPa).
1.2.5 Parameters of analyzable fluid
1.2.5.1 Analyzable fluid temperature range (aqueous solutions) on pH
measurements is the same as pH-meter temperature compensation range shown
in Table 1.2 and is governed by the type of electrode used.

6
Table 1.2 − pH-meter temperature compensation range
Type of electrodes used pH-meter
temperature
com
pensation
range, С
ЭСК-10601/7(К80.7) combined glass electrode
from 5 to 50
ЭСК-10601/4(К80.7) combined glass electrode
ЭСКЛ-08М combined laboratory glass electrode
ЭСКЛ-08М.1 combined laboratory glass electrode
201020/51-10-04-22-120/000 combined pH-electrode with gel filler
ЭС-10601/7(К80.7) glass electrode
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 laboratory glass electrode from 5 to 40
ЭВЛ-1М3.1 laboratory auxiliary electrode
1.2.6 Operating conditions:
ambient air temperature, С …………..……………. from plus 5 to plus 50;
ambient air relative 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 display illumination off ………..………………………………............ 20;
with display illumination on …………………………………….………… 300.
1.2.9 The electrode system in the pH-meter may be set to the parameters
shown in Table 1.3.
Table 1.3 − Parameters of electrode system
Slope of electrode system hydrogen curve in the
linear part thereof, at least (in absolute figures)
Coordinates of electrode
system isopotential point
Е
i
, mV pH
i
, pH
-52.2 mV/pH (at temperature of 20 С)
0±30 4.0±0.3
18±30 6.7±0.3
0±45 7.0±0,3
1.2.10 Dimensions and weight of the pH-meter main components are shown
in Table 1.4.

7
Table 1.4 − Dimensions and weight of the pH-meter main components
pH-meter
version
Identification of components Dimensions,
mm,
maximum
Weight,
kg,
maximum
MAPK-903,
MAPK-903/1
ВР48.01.000 convertor unit 65
130
28
0.12
ВР48.01.400 temperature sensor
11
128 0.05
MAPK-903
ЭСК-10601/7(К80.7)
glass combined electrode 12170
0.10
ЭСК-10601/4(К80.7)
glass combined electrode
ЭСКЛ-08М
glass laboratory combined electrode 20175
ЭСКЛ-08М.1
glass laboratory combined electrode
201020/51-10-04-22-120/000 (Jumo)
combined pH-electrode with gel filler 12170
MAPK-903/1
ЭС-10601/7(К80.7)
glass electrode
12170
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 13160
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 vibration of 5-35 Hz frequency, shift amplitude of 0.35 mm in
direction shown by the "Top" sign on a crate.
1.2.12 Safety requirements
average time between failures (except electrodes), h, minimum ..... 20000;
mean recovery time, h, maximum ……………………………..…………… 2;
pH-meter average life span, years, minimum ......………...……………... 10.
1.2.13 Convertor unit protection level ensured by enclosure IP65 meets
GOST 14254-96.

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1.3 Technical data
1.3.1 Range of hydrogen-ion activity index measurements by pH-meter at
analyzable fluid temperature of (25.0 ± 0.2) С, pH ..........………... 0.000 to 12.000.
1.3.2 The range of pH-meter allowable basic absolute accuracy on
measuring pH at analyzable fluid temperature of (25.0 ± 0.2) С and ambient air
temperature of (20 ± 5) С, pH ………………………….……………………... ± 0.050.
1.3.3 The range of pH-meter allowable complementary absolute accuracy on
measuring pH caused by changes in analyzable fluid temperature within pH-meter
temperature compensation range as shown in Table 1.2, pH ……………… ± 0.100.
1.3.4 The pH-meter analyzable fluid temperature measuring range,
°С………………………………....……………….………….………..... 0.0 to plus 70.0.
1.3.5 The range of pH-meter allowable basic absolute accuracy on
measuring analyzable fluid temperature at ambient air temperature of (20 ± 5) С,
С...................................................................................................................... ± 0.3.
1.3.6 The range of pH-meter allowable complementary absolute accuracy on
measuring analyzable fluid temperature 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, °С ………..…..…………………. ± 0.1.
1.3.7 pH-meter U measuring range, mV...from minus 1.000.0 to plus 1.000.0.
1.3.8 The range of transducer allowable basic absolute accuracy on U
measurements 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 allowable basic absolute accuracy on pH
measurements at ambient air temperature of (20 ± 5) С, pH ...…………… ± 0.020.
1.3.12 The range of transducer allowable complementary absolute accuracy
on pH measurements caused by variations of analyzable fluid temperature from 0
to plus 70 С (transducer temperature compensation accuracy), pH .…….. ± 0.020.
1.3.13 The range of transducer allowable complementary absolute accuracy
on pH 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, pH …………………………………………………... ± 0.005.
1.3.14 The range of transducer allowable complementary absolute accuracy
on U measurements caused by resistance effect in the measuring electrode circuit
per each 500 MΩ at variations from 0 to 1.000 MΩ, mV ….............................. ± 0.2.
1.3.15 Transducer output (reading) setting time, s, maximum …..……….. 10.
1.3.16 pH-meter output (reading) setting time, min, maximum …..……….. 10.
1.3.17 When connected to a PC through a USB jack, the pH-meter
communicates with the PC.

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1.4 Apparatus components
1.4.1 According to version and delivery set the apparatus is composed of:
convertor unit with temperature sensor;
electrodes as shown in Table 1.1; and
tools and accessories kit.
1.5 Design and operation
1.5.1 pH-meter general data
MAPK-903 (MAPK-903/1) pH-meter is a small-size microprocessor
instrument used to measure pH or U and temperature of aqueous solutions.
Measured temperature, pH and U (depending on measurement conditions) are
read from a digital liquid crystal display (hereafter display) with the least significant digit
0.1 С; 0.001 pH or 0.1 mV.
The pH-meter makes it possible to enter the measurement 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
temperature of 25 С.
pHt values may be reduced to рН25 in the range from plus 5 to plus 50 С.
The reduced рН25 value may be read from the display.
The pH-value of highly dilute alkaline and acid solutions and analyzable fluid
temperature relationship implemented in the pH-meter is graphically shown in
Attachment B.
1.5.2 pH-meter operating principle
The pH-meter operation is based on the potentiometric analyzable solution
pH measuring method.

10
The electrode system immersed in an analyzable solution generates U
linearly dependent on pH value.
Signals (U) from the electrode system and temperature sensor are applied to
the convertor unit where they are amplified and digitized.
The measured U of the pH-meter electrode system is translated into pH
value in view of analyzable solution temperature, i.e. temperature compensation
occurs automatically. The compensation relates to only U variations of the
electrode system.
1.5.3 pH-meter design
MAPK-903 pH-meter is shown in Figure 1.1a and MAPK-903/1 pH-meter is
illustrated in Figure 1.1b.
The convertor unit 1 enclosed in a plastic tight casing, transforms signals
from the electrode system, displays measurement results and transmits data to a
PC.
The convertor unit front panel carries:
a display screen 2 to show measured pH, pH25, 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 of MAPK-903/1 pH-meter convertor
unit is used for connection of an adapter 9 of which jack accepts the measuring
electrode 10. The socket on the adapter bracket accepts the reference electrode
plug 11.
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 of MAPK-903/1 pH-meter convertor
unit is used for connection of an adapter 9 of which jack accepts the measuring
electrode 10. The socket on the adapter bracket accepts the reference electrode
plug 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

12
1.5.4 Functions of keys on the convertor unit front panel
The pH-meter uses non-locking keys.
Symbols on the light key space show their functions in measurement mode.
Symbols on the dark key space reflect their functions when working with the
electronic scratchpad and display menu.
The green key is used to turn on and off the pH-meter. It is to
be depressed for 2 s.
The key is used:
– in the measurement mode − to move to the pH-meter
calibration mode. It is to be held depressed for 0.5 s;
– when working with the electronic scratchpad and display
menu − to move leftward in a line.
The key is used:
− in the measurement mode − to select mode of pH, pH25, U
measurement (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 scratchpad and display
menu − to move rightward in a line.
The key is used:
– in the measurement mode − to turn on and off display
light;
– when working with the electronic scratchpad and display
menu − to exit from electronic scratchpad and display
menus.
The key is used:
− in the measurement mode − to enter the display menu. It
is to be depressed for 0.5 s;
− when working with the electronic scratchpad and display
menu − to move downward in a line.
CAL
MODE
READ
EXIT
MENU

13
The key is used:
− in the measurement mode − to enter data into the
electronic scratchpad. It is to be held depressed for 0.5 s;
− when working with the electronic scratchpad and display
menu − to confirm selected parameters and operating
modes.
1.5.5 Measurement mode
1.5.5.1 Measurement displays
Display screen 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 − 100 %;
RECORD
ENTER
24 sep. 13:56
10.508 рН
22.5
C
28 sep. 10:58
8.552 рН25
20.5
С
24 sep. 14:06
−987.3 mV
22.5
С

14
− date (day and month) and current time. The date and time are set up as
described in 1.5.8 (DATE TIME menu command);
− measured pH, pH25, U values. U is measured in mV. pH25 and U
measurement modes are made accessible on pH-meter adjustment according
to 1.5.8 (MEASURING MODES menu command). If the modes are available, to
move from pH measurement mode to pH25, U measurement modes the key is
to be depressed;
− temperature of analyzable fluid, °С.
Display light is turned on and off using key.
According to 1.5.8 (ADDITIONAL SETTINGS menu command), 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 pH, pH25, U
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 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 pH-meter
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;
pH, pH25 or U values measured according to the selected operating mode.
MODE
▲
MENU
▼
RECORD
ENTER
RECORD
ENTER
EXIT
MODE
▲
SHARED
FOLDER
- - - - - - - - - - - - - - - - - - - - - - - - -
SAVED!
►24 sep. 13:56 36.1°С
рН=10.253

15
If the scratchpad is filled to capacity, on entering data the display shall show
the message "SAVING IS IMPOSSIBLE, SCRATCHPAD IS OVERFILLED".
1.5.7 View of records in the electronic scratchpad
To view records, 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 colour square on the scroll bar
shall show an approximate location of the visible part of the list relative to the
whole list.
Using keys and move the cursor to the folder needed and press
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 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 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 scratchpad has been made in the U measurement mode, the
display shown in Fig. 1.6 shall come up.
Fig. 1.6
READ
►
MODE
▲
MENU
▼
MODE
▲
MENU
▼
MODE
▲
MENU
▼
RECORD
ENTER
SHARED FOLDER
- - - - - - - - - - - - - - - - - - - - - - - - - -
►05 jan. 15:30
t = 25.1°С
U = 255.3 mV

16
If entry in the scratchpad has been made in the pH measurement mode, the
display shown in Fig. 1.7 shall come up.
If entry in the scratchpad has been made in the pH25 measurement mode,
the display shown in Fig. 1.8 shall come up.
Fig. 1.7 Fig. 1.8
If there are no entries in the folder, the respective message shall come up.
To delete the entry against the cursor, depress key. The display shown
in Fig. 1.9 shall come up.
Fig. 1.9
Using either of the keys or move the cursor against DELETE
RECORD and depress 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 .
MODE
▲
MENU
▼
RECORD
ENTER
RECORD
ENTER
RECORD
ENTER
EXIT
SHARED FOLDER
- - - - - - - - - - - - - - - - - - - - - - - - - -
►05 jan. 15:30
t = 25.1°С
U = 255.3 mV
рН = 2.508
SHARED FOLDER
- - - - - - - - - - - - - - - - - - - - - - - - - -
►05 jan. 15:30
t = 25.1°С
U = 255.3 mV
рН = 2.508
рН25 = 2.508
SHARED FOLDER
- - - - - - - - - - - - - - - - - - - - - - - - - -
05 jan. 15:30
t = 25.1°С
U = 255.3 mV
pH = 2.508
► EXIT
DELETE RECORD

17
1.5.8 MENU mode
The pH-meter parameters shall be viewed and changed in the MENU mode.
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
the keys and 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 ► 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
ENTER
EXIT
MENU
►PROBE PARAMETERS
MEASURING MODES
ADDITIONAL SETTINGS
SCRATCHPAD EDITOR
DATE TIME
PROBE PARAMETERS
S = 97 %
Ei = –24 mV
рНi = 7.00

18
The display shall show the electrode system parameters based on the last
calibration:
S is electrode system slope in % of the rated value;
pНi and Еi are the coordinates of the electrode system isopotential point.
1.5.8.2 ► MEASURING MODES
► MEASURING MODES is a command in the menu to add U and pH25
measurement modes to the list of accessible measurement 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 automatic light actuation.
On selection of this menu command the display shown in Fig. 1.13 shall
come up.
RECORD
ENTER
MEASURING MODES
U NO
►pH25 YES

19
Fig. 1.13
► SETTING рНi is the sub-menu command intended to select the needed
value of the рНi 7.00; 6.70 or 4.00 isopotential points.
On selection of this sub-menu command the display shown in Fig. 1.14 shall
come up.
Select the needed рНi value and press the key.
Fig. 1.14
► AUTOSHUTDOWN is the 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
AUTOSHUTDOWN OFF
AUTOBACKLIGHT 10 s
SETTING
рН
i
► 7.00
6.70
4.00
AUTOSHUTDOWN
► OFF
15 min
30 min

20
► AUTOBACKLIGHT is the sub-menu command intended 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. 1.16 shall
come up.
Fig. 1.16
If the cursor is moved against OFF, automatic illumination shall not work.
Select parameter needed 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
RECORD
ENTER
SCRATCHPAD EDITO
R
► CLEAR FOLDER
CLEAR ALL FOLDERS
CREATE FOLDER
DELETE FOLDER
AUTOBACKLIGHT
OFF
► 10 s
30 s
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