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1
Microprocessor
Benchtop
Conductivity/
Resistivity Meter
SC-2300
Operation
Manual
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2
Content Table
1. Specifications 1
2. Configuration
2.1 Display 2
2.2 Socket 2
2.3 Keypad 3
3. Operation
3.1 Measurement 4
3.2 Measurement function and file bit shift 4
3.3 Temperature function and compensation 5
3.4 Auto Read 5
4. Settings
Block diagram of settings 6
4.1 Parameter settings 7
4.1.1 Entry of set-up mode 7
4.1.2 Settings of measurement mode 7
4.1.3 Settings of data deletion 7
4.1.4 Settings of baud rate (BAUD) 8
4.1.5 Settings of system time 9
4.2 Deletion of all stored data 10
4.3 System reset 10
Block diagram of calibration and temperature compensation settings 11
4.4 Settings of calibration parameter 12
4.4.1Electrode coefficient and calibration parameter 12
4.4.2 Standard solution calibration parameter 13
4.4.3 Temperature compensation coefficient 13
Block diagram of operations in measurement mode 14
4.5 Auto/manual data storage 15
4.5.1 Auto storage 15
4.5.2 Manual storage 15
4.5.3 Data full 15
4.6 Data readout and output 16
4.6.1 Auto transmission 16
4.6.2 Manual readout and transmission 16
5. Calibration
Block diagram of Calibration 20
5.1 Standard solution preparation 21
5.2 Calibration mode 21
5.3 Entry of calibration mode 21
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5.3.1 Electrode coefficient calibration 21
5.3.2 Standard solution single-point calibration 21
5.3.3 Standard solution five-point calibration 22
5.3.4 Error message 22
6. Instruction set for RS232 23
7. Alternative fittings 23
8. Failure recovery 24
9. Maintenance 24
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1. Specifications
Model SC-2300
Function
µS/ mS/ MΩ/ Salt/ TDS/ TEMP
Cond.
0.00 uS/cm ~ 200.0 mS/cm in 5 measuring ranges for manual or auto switch
Res.
0.00~100.00 MΩ- cm
Salt
0.0~70.0ppt
TDS
0~2000ppm
Range
TEMP
-10.0~+110.0°C
Cond.
0.01µS/cm
Res.
0.01 MΩ-cm
Salt
0.1 ppt
TDS
1 ppm
Resolution
TEMP
0.1°C
Cond.
0.5%(±1Digit)
Res.
1%(±1Digit)
Salt
0.5%(±1Digit)
TDS
0.5%(±1Digit)
Accuracy
TEMP
±0.2°C(±1Digit)
PT-1000 or NTC 30K auto recognition
Temperature
Compensation
Auto / Manual selectable
Temperature
Coefficient
Non-linear / 0.00~20.00% Linear
Ref. Temperature
T
ref
25℃
Manual calibration
Single point known standard solution or electrode constant calibration
Standard solution
calibration
Single or up to 5-point known standard solution calibration; default five standard solution
10/84/1413 uS/cm & 12.88/100 mS/cm adjustable
RS232 interface
YES
Output Data logging
450 sets (measuring value, temp., date, time & ID)
Ambient temperature
0~50°C
Storage Temperature
-20~+70°C
Display
3/4” LCD / backlit
Power
4 x AA / AC ADAPTOR
Battery
Around 100…500hrs according to measuring range and whether the backlit is used
Protection Type
IP43
Dimension (L x W x H)
220 x 190 x 70mm
Weight
0.8kg
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2. Configuration
2.1: Display:
2.2 Socket:
POWER : DC 6V Adaptor socket
RS-232 : RS-232 output socket
REC. : no function at the moment
T/P : External temperature probe socket (prohibited if using electrode which has combined
with temperature sensor).
EC/DO : Resistivity or Conductivity electrode waterproof socket
Set-up
mode
Measurement
mode
Measurement
unit
Auto temperature
compensation
Time reminder
Calibration
mode
Data
storage
mode
Low
battery
reminder
Data reading
/Transferring
mode
Data Storage ID
Storage ID
Data transferring
speed mode
Read mode
Auto mode
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2.3 Keypad:
: Power switch--- Push it to power on and push it again to power off
: Cond./Res./Salt/TDS measurement shift key; pushing it at any time to back to
measurement mode
: Enter calibration mode
: Auto read--- Push one time for startup and push again for cancellation.
: Upward or leftward key
: Downward or rightward key
: (ENTER) confirmation, execution, and confirmation for RS-232 manual output
: (Recall) Data recall key and measurement value selection key
: (Store) Data storage key
: Enter system parameter setup, see ch.4.1
: Delete all stored data, see ch.4.2
: System reset, see ch.4.3
: Shift among five manual ranges and the auto range recognition mode, see ch.3.1
: Enter calibration parameter settings, see ch.4.4
: Enter auto continual storage settings, see ch.4.5
: Enter auto continuation data transmission settings, see ch.4.6
+
+
+
+
+
+
+
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3. Operation
3.1 Measurement:
Push key to power on the instrument. It will automatically show last measurement
and be ready for new measurement.
3.2 Measurement function shifting:
1. Push【MODE】 to shift among Cond., Salt, and TDS in Cond. Mode. This function is unavailable
in Res. mode.
2. Push【ENT】+【MODE】 to shift among five manual ranges (20.00µS /200.0µS /2000µS /20.00
mS /200.0 mS) and auto range shifting mode. When entering into auto range shifting mode,
symbol will disappear after 3 seconds.
Remark: Before measuring salt and TDS, please finish the calibration according to the
conductivity calibration steps, and then set the factor value according to the standard
solution of salt and TDS.
Push【ENT】+【MODE】
Push【ENT】+【MODE】
Push【ENT】+【MODE】
Push【ENT】+【MODE】
Push【ENT】+【MODE】
Push【ENT】+【MODE】
Push【MODE】to shift
to Salt measurement
Push【MODE】to shift
TDS measurement
Push to adjust
the salt value. Note:
Factor range is 0.4~1.5
Push to
adjust Total Dissolved
Solids. Note: Factor
range is 0.4~1.5
Push【MODE】
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1. Push【ENT】for the next measurement
2. Push 【AUTO】or【MODE】
3.3 Temperature measurement and compensation:
1. Auto Temp. Compensation: Auto recognition of temperature probe system. (NTC30K or PT1000)
Push or to adjust the temperature within in ±5℃. Push keys simultaneously to
back to the original value.
2. Manual Temp. Compensation: Enter MTC 25℃ automatically if no temperature probe. Push
or to adjust the temperature. Push simultaneously to back to the default value.
3. Temperature compensation: The temperature of the to-be-tested solution may not be 25℃. For
standardization, the conductivity value of the solution which is not at the temperature of 25℃ will
be calculated to that of solution at the temperature of 25℃.
4. According to the temperature coefficient required by the measurement, three kinds of temperature
compensation can be applied: Linear(Lin), Non-linear(nLin), and non compensation (0.00％). See
the setting method in ch. 4.4.3. Users can set by themselves as needed.
5. Temp. Coefficient (TC for abbreviation), the conductivity value of the solution will increase as the
temperature rises. TC may differ from different solution. See the formula as follows:
C25
Conductivity at 25℃
Ct
Conductivity at T℃
Formula 1: Ct = C
25
{ 1+β( T – 25 ) }
T Temp. of the tested solution
β Temp. Coefficient
Formula 2: β = ( Ct－C
25
) / { C
25
( T－25 )}
6. How to measure the TC of the solution: If the user wants to get a more accurate value, the above
formula can be applied to measure the TC of the solution and set an appropriate TC on the machine.
Take 0.01N KCl as an instance, set the TC as non compensation (0.00%) in the machine. Control
the same solution respectively at 25℃ and 20℃. You could acquire measurement at 25℃(C
25
) for
1413µS; and the measurement at 20℃(Ct) for 1278 µS. According to formula 2, β＝1.91%.
3.4 Auto Read:
In the measurement mode, push 【AUTO】 to start and push 【ENT】 to measure. Then, push
【ENT】to make the next measurement. Push【AUTO】or 【MODE】 at any time will allow
backing to the measurement mode (See the following charts).
The symbol
twinkles for about 10
seconds to get a stable
value.
The symbol stop
twinkling and a value will appear
after the measurement is stable.
Back to the measurement
Push【AUTO】
Push【ENT】
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4. Settings
Block diagram of settings
Push or to
modify the minute
Data overwriting settings
Baud rate settings
System time settings
6
Power off
Push or to
modify the year
Push or to
modify the month
Push or
to modify the day
Push or to
modify the hour
Push or to select
other transmission speed:
1200, 2400, 4800 or 9600
Push or to
select conductivity
or specific resistivity
Push or to select
auto overwriting or
cancel overwriting
: ENTER key
Push
【
STO】+ ，, ,
Release + 【STO】
to delete all stored data
Push
【
CAL
】
+ ,
Release + 【CAL】
for system reset
Push
【
MODE】+ ,
Release + 【MODE】
to entermeasurement mode
Settings of
measurement mode
(Data Clean)
(RS 232)
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4.1 Parameter settings:
4.1.1 Entry of set-up mode:
In the power-off status, push 【MODE】first and then push 【 】 to power on the machine;
then please release 【 】 first and then 【MODE】to enter the parameter setting mode.
Use or to select.
4.1.2 Settings of measurement mode:
4.1.3 Settings of data deletion:
Enter “Settings of data deletion”
Push 【ENT】to enter
Push or to select
MΩ-cm、µS/cm
Enter “Settings of data deletion”
Push【ENT】to confirm it
Push【ENT】to enter
Enter “Settings of baud rate”
Push【ENT】to confirm it
Push or to select auto
overcast or cancel auto overcast
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4.1.4 Settings of baud rate (BAUD):
Enter “Settings of RS-232 baud rate”
Push【ENT】to enter
Push【ENT】to confirm it
Push or
to select
Enter “Settings of system
Push or
to select
Push or
to select
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4.1.5 Settings of system time:
Enter “Settings of system time”
Push【ENT】to ente
r
Push or to modify the
hour, then push【ENT】to confirm it
Push or to modify the year,
then push【ENT】to confirm it
Push or to modify the
month, then push【ENT】to confirm it
Push or to modify the
date, then push【ENT】to ensure
Back to “Setting of measurement
mod, or push
【MODE】to back to
measurement mode
9
Push or to modify the
minute, then push 【ENT】to confirm it
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4.2 Deletion of all stored data:
In the power-on status, push【STO】first and then【 】; after that, release【 】first and
then release【STO】to enter the data deletion mode.
4.3 System reset:
In the power-off status, push【CAL】first and then 【 】; after that, release【 】first and
then release【CAL】to enter the system reset page.
Factory defaults:
Data deletion settings: Auto
(BAUD) settings: 4800
Data transmission settings: read the stored data on the display (Sto diSP)
Push【ENT】to confirm to delete
all stored data or push
【MODE】to back to the
measurement mode
Back to the
measurement mode
Push【ENT】to confirm the
system reset; or push
【MODE】
to back to the measurement mode
Back to the
measurement mode
10
(Data Clean)
(Initial Setting)
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Block diagram of calibration and temperature compensation settings
Settings in conductivity mode
Settings in specific resistivity
11
Measurement
mode
Push↑↓ to
adjust
compensation
Push↑↓ to
adjust
compensation
coefficient
Power on
Measurement
mode
Push【ENT】+【CAL】
Push↑↓ to
adjust
compensation
coefficien
t
：ENTER key
Calibration and temperature
compensation settings.
Push 【ENT】+【CAL】
Power on
Electrode coefficient
calibration settings
Standard solution
calibration settings
Measurement
temperature coefficient
settings
Measurement temperature settings
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4.4 Settings of calibration parameter:
In the power-on status, push【ENT】first and then push【CAL】to enter set-up mode of calibration
parameter. Use to select.
4.4.1 Electrode coefficient and calibration parameter:
Electrode coefficient and calibration parameter
=
Push or to set the temperature
Back to measurement mode
Push【ENT】to confirm it
Push【ENT】to confirm it
Push【ENT】to enter the settings
of calibration temperature
compensation coefficient
Push【ENT】to confirm
Push or
to select
Push or
to select
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4.4.2 Standard solution calibration parameter:
(Only suitable when the measurement unit is conductivity)
4.4.3 Temperature compensation coefficient:
Push【ENT】to confirm it
Push or to select
Back to measurement mode
Push【ENT】to confirm it
Push【ENT】to confirm it
Push【ENT】to confirm it
Back to measurement mode
Push or
to select
Push【ENT】to confirm it
Push or
to select
Push or to set the coefficient value
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In case of data full
unable to store,
will twinkle for
5 seconds
Block diagram of operations in measurement mode
Push or
to set the second
Manual read and transmission
Push【RCL】to shift circularl
y
among 4 modes
After
transmission,
back to the
measurement
Back to the
measurement
mode
Appear recently stored data
Push or to
modify the inquiry site
Read the ID, and push or
to in
q
uire other data through ID
Read the stored year
Read the stored date
Read the stored time
Appear the original ID
Back to the
measurement
Push or to
set the ID number
Transmission mode
Power on
Data store full
Auto store
Push
【
ENT】+
【
STO
】
Manual store
push【STO】
Stor age
Appear the
original ID
Push or to
set the ID number
Push or to
set the minute
Continual
measurement and data
Cancel continual
storage
If twinkles,
it means that the
data is stored
Push【ENT】+【STO】to close
Back to the
measurement
mode
After
transmission,
back to the
measurement
mode
automatically
CELL direct
calibration
Std simple point
calibration
Std five point
calibration
14
Back to the
measurement
mode
Back to the
measurement
mode
：ENTER key
Push or
to set the minute
Continual
Cancel
continual
storage
Push or
to set the second
Push【ENT】+【RCL】
Auto transmission
Push【ENT】+【RCL】
If twinkles,
it means that the
data is stored
Back to the
measurement
mode
The stored data is
transmitted to the display
The stored data is
transmitted through RS232
The calibrated data is
transmitted to the display
The stored data is transmitted
through RS232
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4.5 Auto/manual data storage:
4.5.1 Auto storage:
In the measurement mode, push【ENT】
first and then push【STO】to enter the
auto continual storage set-up mode.
4.5.2 Manual storage:
In the measurement mode, push【STO】
to enter manual store page.
4.5.3 Data full:
When the data full storage, the display
will twinkle as a reminder, and five
seconds later, it will back to the original
measurement mode.
According to step 4.2, delete all the data.
If under auto overwriting mode, there is
no reminder of data full.
Back to the
measurement mode
Push【ENT】to confirm it
Push or to set ID number;
Push 【ENT】to confirm the storage
Appear the original ID.
Push 【ENT】to confirm it
Push or to set ID number;
Push【ENT】to confirm it and ente
r
settings of automatic storage time.
Push or to set the
minute, and push for
confirmation and settings of
second
Push or to set the seconds,
and push for confirmation. (The
minimum value is 5 seconds)
Back to measurement
mode
If twinkles,
it means that the data
is stored
Push【ENT】＋【STO】to cancel
the auto store mode
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4.6 Data readout and output:
4.6.1 Auto transmission:
In the measurement mode, push【ENT】
first and then push【RCL】to enter auto
transmission.
4.6.2 Manual readout and transmission:
In the measurement mode, push【RCL】to
shift among 4 modes circularly, and push【ENT】
to enter.
Push or to set the seconds,
and push【ENT】for confirmation.
(The minimum value is 5 seconds)
Back to measurement
mode
If
twinkles, it means that
the data is stored
Push【ENT】＋【RCL】to
cancel the auto store mode
Push【ENT】to enter, and the recently stored data will appear
Push or to modify the
inquiry site. Push Enter to confirm it
Push【ENT】to read the data storage date
Push【ENT】to read the stored time
Read the ID and push to inquire
other data according to the ID. Push enter to
read the data value and
data storage year.
Back to measurement
mode
Push【ENT】
Push 【ENT】to read the temperature
value of the data
Push or to set the minute,
and push【ENT】for confirmation an
d
enter the second setting.
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B. Transmit the stored data through RS-232
Transmit all stored data through RS-232
C. Read the calibrated data on the display
C.1 Read the calibrated data on the display
Push【ENT】to transmit
After the transmission,
back to measurement
mode
Push【ENT】, and it will show the standard
solution value and electrode coefficient
Push【ENT】, and it will show the
calibrated temperature compensation
coefficient value
Back to
measurement mode
Push【ENT】
Push【ENT】, and it will show the
calibration record
year
Push【ENT】, and it will show the calibration
record date
Push【ENT】, and it will show and the
calibration record
time
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C.2 Read simple-point calibration data of standard
solution (when the calibration parameter is set
as Std 1P calibration).
Push【ENT】to enter, and the data and electrode
coefficient of standard solution appear
Push【ENT】and the calibration record year appears
Push【ENT】, and the calibration record date appears
Push【ENT】and the calibration record time appears
Push【ENT】
Back to
measurement mode
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C.3 Read five-point calibration data of standard
solution (when the calibration parameter is
set as Std 5P calibration).
D. Transmit the stored data through RS-232
Transmit all stored data through RS-232
Push【ENT】to transmit
After the transmission,
back to measurement
mode
Back to
measurement
mode
Push【ENT】and the calibration record
date appears
Push【ENT】and the calibration record time
Push【ENT】
Push【ENT】and the calibration record yea
r
Push【ENT】, show the calibration value of Buffer 2.
If there is no data, it will show “NULL.”
Push【ENT】, show the calibration value of Buffer 1.
If there is no data, it will show “NULL.”
Push【ENT】, show the calibration value of Buffer 3.
If there is no data, it will show “NULL.”
Push【ENT】, show the calibration value of Buffer 4.
If there is no data, it will show “NULL.”
Push【ENT】, show the calibration value of Buffer 5.
If there is no data, it will show “NULL.”
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5. Calibration
Block diagram of Calibration
20
Conductivity mode
Specific resistivity mode
Power on
Push【CAL】
The instrument
is reading
coefficient
Back to
measurement
mode
Use ↑↓keys to
select suitable
coefficient
C=.0100
C=0.100
C=0.475
C=10.00
Coefficient valve
shines，use ↑↓
keys to adjust
coefficient value
Back to
measurement
mode
The
instrument is
reading
coefficient
Use ↑↓keys to
select
known
standard
solution value
The
instrument
is reading
coefficient
Use ↑↓keys to
select
known
standard
solution value
Use ↑↓keys to
select
known
standard
solution value
The
instrument is
reading
coefficient
Back to
measurement
mode
Push【MODE】
Push【MODE】
Coefficient valve
shines，use ↑↓ keys
to adjust coefficient
value to the known
standard solution
value
Back to
measurement
mode
Use ↑↓keys to
select suitable
coefficient
C=.0100
C=0.100
Use ↑↓keys to select
known standard
solution value
The
instrument is
reading
coefficient
The
instrument is
reading
coefficient
Push【MODE】
Use ↑↓keys to select
known standard
solution value
Push【MODE】
：ENTER key
Push【MODE】
Use ↑↓keys to select
standard solution
value, including:
10.00uS/cm,
84.0uS/cm,
1413uS/cm,
12.88mS/cm,
100.0 mS/cm
five default values
Back to
measurement
mode
Back to
measurement
mode
Back to
measurement
mode
Back to
measurement
mode
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5.1 Standard solution preparation:
Put reagent KCl in an oven of 150℃～180℃ for 5 hours, and then put it in a dry container until it cools
down to the ambient temperature. Dissolve 0.7456 g KCl powder into 1 kilolitre pure water to be 0.01N
KCl standard solution (1413µS/cm).
5.2 Calibration mode:
Measured functions Calibration method Preset temperature compensation method
Set CELL CONSTANT
Linear(Lin) 2.00％ adjustable
Std 1P Prepare 5 selectable kinds of
Buffer
According to standard solution default
Conductivity
Std 5P Prepare 5 selectable kinds of
Buffer
According to standard solution default
Special resistivity Set CELL CONSTANT Non-Linear(nLin)
5.3 Entry of calibration mode: Temperature coefficient produces a great influence on measurement of
conductivity, so it is suggested to control the temperature of standard solution within 25±3℃ during the
calibration.
5.3.1 Electrode coefficient calibration:
1. When the calibration parameter is set as electrode coefficient setting
mode (see 4.4), push【CAL】to enter the electrode coefficient setting
page, and then push【ENT】to enter the next page.
2. Push or to select electrode coefficient default 10.00, 0.475,
0.100 or 0.0100 (resistivity only includes 0.100 and 0.0100), in
order to select a suitable electrode coefficient value. After selecting
the suitable default, push【ENT】to enter the next page.
3. Then, the electrode coefficient value on display begins to twinkle.
Push or to adjust the electrode coefficient value until equal
to the buffer’s standard. Then, push【ENT】to back to the
measurement mode.
5.3.2 Standard solution single-point calibration:
1. When the calibration parameter is set as single-point calibration
(see 4.4), push【CAL】to enter Standard solution single-point
calibration, and then push【ENT】to enter the calibration solution
selection page.
2. The display will show the first preset buffer’s standard value and
temperature value. Push or to modify the standard value,
including five default values 10.00µS, 84.0µS, 1413µS, 12.88mS and
100.0mS. After selecting the suitable default, push【ENT】to enter the
next page.
3. The symbol begins to twinkle, indicating that the
instrument begins auto calibration. After the calibration, the display
shows the calibrated electrode coefficient automatically.
4. After the calibration, the display shows the calibrated electrode
coefficient automatically. Push【ENT】to back to the measurement mode.
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22
5.3.3 Standard solution five-point calibration:
1. When the calibration parameter is set as five-point calibration (see
4.4), push【CAL】to enter Standard solution five-point calibration,
and then push【ENT】to enter the first CAL1 page. Push【MODE】
at any time will allow you intermit the calibration and back to the
measurement mode.
2. Push or to select calibration point CAL1~5. Their default
values are respectively 10.00µS, 84.0µS, 1413µS, 12.88mS and
100.0mS. You can select any calibration point to make single-point,
two-point, three-point, four-point, and five-point calibration. Clean
and dry the electrode, and then put it into the buffer solution. Push
【ENT】to enter the calibration page.
3. The symbol begins to twinkle, indicating that the
instrument begins auto calibration. After the calibration, the display
shows the calibrated electrode coefficient automatically.
4. After the calibration, the display shows the calibrated electrode
coefficient automatically.
5. Push【ENT】to enter the second calibration (CAL2) and finish the
first point calibration. Push【MODE】to store the calibration data
and the system will exit calibration mode and back to measurement
mode.
6. Other CAL2~CAL5 calibration applies the same steps as CAL1.
Feature: The design of this instrument is free of the calibration sequence, so after finishing any point
calibration, you can push【ENT】to enter the next point calibration, and push【MODE】to store the
calibration data. Then, exit the calibration mode and back to the measurement mode to finish the
calibration of any one or a few points.
5.3.4 Error messages: When the display shows error messages of failure
calibration, please refer to chapter 8 Failure Recovery to remove the
errors and restart the calibration.
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23
6. Instruction set for RS232
The communication between the instrument and the Windows Hyper Terminal is set as follows:
1. Click 【Start】on the lower left, and select 【All Programs】→【Accessories】→【Communication】
→【Hyper Term inal】, and the display will show a window of “Hyper Te rmin al”.
2. Set icon and online name for Hyper Terminal before entering the “ONLINE” window.
3. Select communication terminal (for example, select 「connect COM1」) in 「Use online (N):」in
“ONLINE” window, and then enter the window “COM1 content”.
4. In 「transmission bit per second (B):」in “COM1 content”, select baud rate=9600 (It should be
consistent with controller settings), data bit (D)=8, parity check(P)=none, stop bit (S)= 1, flow control
(E) =none.
5. Click 【disconnet】
6. Click 【file】→【content】, and enter the window “XXX content”.
7. Click 【setting value】→【ASCII setting】to enter “ASCII setting” window.
8. In “ASCII setting” window, select 「newline at the end of each line (S)」,「Respond to the input
characters (E)」,「Add LF at the end of each input line (A)」 and 「newline if exceeding the width of
terminal (W)」, and then leave “ASCII setting” window by pushing 【confirm】.
9. Push 【confirm】to leave “XXX content” window.
10. Push 【call】to link the communication.
7. Alternative fittings
Calibration solution types and description Order number
Conductivity electrode C 0.475≒
8-243
Special resistivity electrode C 0.01≒
8-221-01
Special resistivity electrode C 0.05≒
8-222-01
Flow cell
8-TF-02
10 µS KCl Calibration Solution in 16-oz(about 473ml) glass bottle
00652-24
84 µS KCl Calibration Solution in 500-ml leak-proof bottle
00653-16
1,413 µS KCl Calibration Solution in 500-ml leak-proof bottle
00653-18
12,880µS KCl Calibration Solution in 500-ml leak-proof bottle
00606-10
100,000S KCl Calibration Solution in 16-oz(about 473ml) glass bottle
00652-34
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8. Failure recovery
Failure phenomenon Possible causes Disposition
ERR1 The electrode coefficient has a too large
deviation when using the standard
solution to calibrate.
Replace new standard solution for another
calibration. For others, please refer to the
disposition of measurement deviation in the
following.
ERR2 The measurement is unstable when
using the standard solution in
calibration.
Please refer to the disposition of unstable
measurement in the following.
The electrode is contaminated.
Clean the electrode.
The electrode coefficient (C) is
wrongly set.
Modify the electrode coefficient.
The temperature coefficient (TC) is
wrongly set.
Modify the temperature compensation.
coefficient.
The electrode is damaged or
broken-down.
Readjust the coefficient.
There are air bubbles around the
electrode.
Stir the sample with the electrode to remove
bubbles.
Measurement deviation
Instrument fault Send to the original factory for repair
The electrode is influenced by air
bubbles.
Stir the sample with the electrode to remove
bubbles.
The electrode is polluted. Clean the electrode.
Electrode fault. Replace the electrode.
Unstable measurement
Instrument fault. Send to the original factory for repair.
The electrode plugs is not inserted into
the required place.
Check the electrode plugs and reinsert it into
the required place.
The conductivity value is
zero or the special resistivity
value is out of the range.
The electrode is broken. Replace the electrode.
Not soak in the sample deeply enough. Deepen the soaked length to ensure the
accuracy of temperature.
Deviation of standard comparison. Use standard thermometer comparison to
correct the difference in temperature.
The temperature sensor is broken. Replace the electrode.
Temperature deviation
Instrument fault. Send it back to the local distributor for repair.
The electrode plugs is not inserted into
the required place.
Check the electrode plugs and reinsert it into
the required place.
The temperature sensor is broken. Replace the electrode.
Temperature is wrongly
displayed.
Instrument fault Send it back to the local distributor for repair.
9. Maintenance
9.1 Maintenance of instrument: Please keep it in dry and ventilated environment. Use slightly wet soft
cloth to wipe the instrument’s surface. For pollution by grease, please remove the stain with waxed soft
cloth. Solvent is strictly prohibited.
9.2 Battery replacement:
a. When the display shows【LOBAT】 during the instrument works, please replace with alkali dry
cells.
b. Please power off the instrument before open the battery cover.
c. Take out the old battery and put in 4 new AA batteries in correct directions. Reinstall the battery
cover to finish the battery replacement.
d. Caution! The battery replacement should be finished within 20 seconds; otherwise the date
data will disappear and should be reset.
9.3 Maintenance of electrode: The substances on the measuring side of electrode will influence the
measurement value and cause deviation. Please clean and maintain it regularly. Use soft brush or cotton
stick to clean the graphite surface of electrode.
Pollution types Cleaning methods
Pollution by grease Use mild degreasing agent to clean the electrode.
Pollution by dirt Soak in 2~5% HCl for about 5 minutes.
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