DYS DY-2501B User manual

Chloride-Meter
DY
- 2501B
Operation Manual
DaeYoon Scale Industrial Co., Ltd.

Daeyoon Scale Industrial Co.,Ltd. Chloride-Meter DY-2501B
Table of Contents
1. Technical Preview …………………………………………………………………………… 1
2. Safety guidance
2-1. Safety precaution ………………………………………………………………………… 2
2-2. General safety caution …………………………………………………………………… 2
2-3. Caution for usage ………………………………………………………………………… 3
3. Structure
3-1. Features …………………………………………………………………………………… 4
3-2. Specifications ……………………………………………………………………………… 4
3-3. Exterior
3-3-1. Meter ………………………………………………………………………………… 5
3-3-2. Chloride Sensor ……………………………………………………………………… 6
3-3-3. DY-2501B Basic Kit in a Metal Briefcase …………………………………… 6
3-3-4. DY-2501B Replacement part & Accessories : (Optional Items) ………… 7
4. User's Manual
4-1. Summary …………………………………………………………………………………… 8
4-2. Calibration
4-2-1. Water-soluble chloride(Cl-) calibration ……………………………………… 10
4-2-2. Acid-soluble chloride(Cl-) calibration ……………………………………… 11
4-3. Measurement
4-3-1. Water-soluble chloride(Cl-)measurement …………………………………… 13
4-3-2. Acid-soluble chloride(Cl-)measurement ……………………………………… 13
4-4. Other functions
4-4-1. Time and date adjustment ……………………………………………………… 14
4-4-2. Check electromotive force of the sensor …………………………………… 14
4-4-3. Temperature setup ………………………………………………………………… 14
4-4-4. LCD back light function ………………………………………………………… 14
4-4-5. Load/delete data from memory ……………………………………………… 15
5. Troubleshooting
5-1. Troubleshooting ………………………………………………………………………… 15
6. Maintenance
6-1. Storage and treatments of the sensor …………………………………………… 16
6-2. Storage of meter ……………………………………………………………………… 16
7. Warranty and A/S
7-1. Quality certification …………………………………………………………………… 16
7-2. A/S reporting and counseling ……………………………………………………… 17

Daeyoon Scale Industrial Co.,Ltd. Chloride-Meter DY-2501B
1
1. Technology Preview
Concrete is a basic material for constructing streets, highways, trail roads, and harbors, but
the chloride in concrete causes internal corrosion of reinforcing steel in concrete structures.
So recently this has become an issue affecting people in many areas.
Concrete has an alkalinity of over pH12. This creates a passive state layer on the surface of
reinforcing steel to protect against corrosion, but the chloride ion partially breaks down this
passive state layer eventually leading to corrosion of the reinforcing steel. Hence, the
corrosion of the aggregates accelerates the corrosion of concrete, decreasing the durability
of any concrete-made structures.
Chloride in hard concrete can be classified into two species. There is the water-soluble
chloride form such as NaCl, KCl, CaCl2, which directly affects corrosion of reinforcing steel in
concrete, and the acid-soluble chloride form, 3CaO Al․2O3CaCl․210H․2O, which indirectly affects
corrosion of reinforcing steel in concrete.
In an ion selective electrode (ISE), the potential difference developed between the sensing
and reference electrodes is a measure of the activity of the reactive species. As the activity
of the species reacting at the sensing electrode varies, so does the potential measured
between the two electrodes. As first shown by Nernst, electrode response may be described
by a linear equation:
E=Eo+Sloga
where “E” is the measured voltage, “Eo” is a combination of several constants within the
system including reference potentials, “S” is the slope of the electrode, and “a” is the
activity of the measured species. By measuring the electrode’s potential in both a
standardizing solution and in a sample solution, it is possible to calculate the unknown
solution’s concentration by using the following form of the previous equation:
Cx = Ci x 10 E/S△
where “Cx” is the concentration of the unknown solution, “Ci” is the concentration of the
standardizing solution, “ E” is the difference between the observed potentials in the△
standardizing and sample solutions, and “S” is the electrode slope, the change in electrode
potential per ten-fold change in concentration. All measurement techniques are based upon
some form of this concentration equation. A meter with microprocessor capability is
recommended for all the measurement methods using ion selective electrodes. Meters with a
millivolt readability to ± 0.1 mV may also be used.

Daeyoon Scale Industrial Co.,Ltd. Chloride-Meter DY-2501B
2
250
200
150
100
50
Potential, mV
-5 -4 -3 -2 -1
Log[Cl-]
2. Safety guidance
2-1. Safety precaution
Please read this operation manual thoroughly before using the Chloride-Meter. Details on
maintenance and operating procedures instructions are included in this manual.
Data accuracy and user safety can be obtained only when the following signs are adhered
to.
!
CAUTION
Denote operating procedures and maintenance must be
followed to secure user safety and data accuracy.
!
WARNING
Denote operating procedures and maintenance that, if not
properly followed, may influence accuracy and reliability
of a data. Furthermore, it may result in personal injury or
damage to the equipment.
2-2. General safety caution
!
WARNING
Turn off the power, before you move or storage the
equipment. In case you get standard solution, internal
filling solution, or cleaning solution in your eyes or
mouth, clean it with flowing water and take medical
advice from a doctor immediately.

Daeyoon Scale Industrial Co.,Ltd. Chloride-Meter DY-2501B
3
!
WARNING
Do not use the adapter when using alkaline batteries
(primary batteries). Use the adapter only when using
rechargeable batteries.
2-3. Caution for Usage
!CAUTION
The calibration solution and cleaning solution must be changed often, depending on
the frequency of usage.
Calibration before each use ensures a more accurate measurement data.
The sensor must be rinsed with cleaning solution before and after each step of
calibration and measurement procedures..
Wipe off the surface of the sensor with tissues after each step of calibration and
measurement procedures.
Before calibration and measurement, wait for an one minute after the sensorhas
been inserted in the sample for the sensor to be stabilized.
After calibration is completed, measure the standard solution to check the accuracy
of the calibration. If the result is over the error range (±10%), polish the surface of the
sensor or change the calibration solution before re-calibrating.
The sensor should be at the same temperature as the sample and calibration solution
at calibration and measurement procedure.
Itf the temperature gap is above 10 between the sample and the sensor, may be℃
decreased accuracy of measurement results.
The recommended temperature range of samples to be measured is 10 ~30 .℃℃
Polish the surface of the sensor frequently with sand paper. Impurities on the surface
may impede accuracy of measurements. After polish the surface of the sensor
immerse the sensor in cleaning solution for an hour before reuse.

Daeyoon Scale Industrial Co.,Ltd. Chloride-Meter DY-2501B
4
3. Structure
3-1. Features
Acid-soluble and water-soluble chloride measurement function①
: Simplicity in design for convenient use on a job sites.
Automatic temperature compensation function②
: Measurement data compensated with changes in temperature automatically.
Portable printer③
Data memory function④
: Measurement data memory function
Self Diagnosis function⑤
: The self diagnosis function monitors the status of the meter in real time and
shows error messages on the display when a malfunction occurs.
Safe battery charge function⑥
: The meter is equipped with a overcharge prevention circuit.
Automatic power off function⑦
: Automatic power off function for when meter is not in use for a long time in
order to minimize waste of electricity.
3-2. Specifications
Measurement Object Concentration of chlorideioninhardenedconcrete
Method ISE (Ion Selective electrode)
Measurement Item
Concentration of water-soluble Cl-/NaCl(%)
Concentration of acid-soluble Cl-/NaCl(%)
Total chloride ion quantity(mg/kg)
Temperature( )℃
Measurement Time Approximately one minute (Automatic hold)
Measurement Range 0.0005% ~ 2.0000% Cl-
Accuracy ± 10%of reading (@ 20 )℃
Measurement Resolution 0.0001%
Temperature Compensation Manual/Automatic Adjustment
Temperature Range 0 ~ 40 (Recommended Temp : 10 ~ 30 )℃℃
Display 128× 64 Graphic LCD
Power Requirement
Adapter (Input: AC110V~220V, Output : DC 9V)
Ni-MH Rechargeable Battery (1.2V× 6 EA)
Alkaline Cell (1.5V (AA)× 6 EA)
Power Dissipation 360mW, 440mW (using backlight)
Dimension Meter : 80 × 195 × 40mm
Case(1SET):460×335×110mm
Weight Mete r: Approximately 450g (Including battery)
Case(1 SET) : Approximately 4kg

Daeyoon Scale Industrial Co.,Ltd. Chloride-Meter DY-2501B
5
3-3. Exterior
3-3-1. Meter
Sensor Connector
FUNCT
MODE
CAL MEMORY
MEASURE
1 2 3
6
TEMP
9
mV
ESC
.
5
8
FEED
0
4
DATE
7
PRINT
POWER
DY-2501B
Chloride-Meter
CAL Enter Calibration mode
MODE Enter Measurement mode
MEMORY Load data from memory
FUNCT Enter function setting mode
MEASURE Start Calibration or Measurement
Light (LCD Light)
1Select first cal. point, 0.005%Cl-
Time setup PM
2Select second cal. point, 0.05% Cl-
3Select third cal. point, 0.5% Cl-
4
DATE Set date and time
5Figure key
6
TEMP Temperature setup (ATC/MTC)
7
PRINT Print
8
FEED Feed printer Paper
9
mV Display sensor Electromotive Force
0Time setup AM
POWER Power ON/OFF
ESC
.Go to previous stage
Move cursor
Select calibration/measurement mode
1 2 3 4 5
9876
1 2 3 4 5
9876
Print Port
(RS-232C)
DC Jack
(Adaptor Connection)

Daeyoon Scale Industrial Co.,Ltd. Chloride-Meter DY-2501B
6
3-3-2. Chloride Sensor
3-3-3. DY-2501B Basic Kit in a Metal Briefcase
No. Item Description Q'ty
1 Chloride Electrode Combi, Solid State, 190×20mm 1Ea
2 Electrode cable & connector 1m, Circular(9mm/6pin) 1Ea
3 Chloride Meter Digital LCD Display, Portable type 1Set
4 Electrode Protective Cap - 1Ea
5 Calibration Solution (water-soluble) 0.005% / 0.05% / 0.5% Cl-,(60ml) 3Btl
6 Calibration Solution (acid-soluble) 0.005% / 0.05% / 0.5% Cl-,(60ml) 3Btl
7 Extraction Solution (water-soluble) 40g 3Ea
8 Extraction Solution (acid-soluble) 40g 3Ea
9 Cleaning Solution 60ml 1Btl
10 Internal Filling Solution 39ml 1Btl
11 Adapter AC110/220V, DC9V 1Ea
12 Battery Ni-MH 1.2V, Rechargeable 6Pcs
13 Sand Paper #320 1Ea
14 Operation Manual English 1Vol.
15 Metal Briefcase - 1Set
16 Printer Thermal Type 1Set
17 Print Cable & Adapter AC110/220V, DC8.4V, 800mA 1Set
18 Printing Roll 40×57mm, Thermal roll paperΦ2R/L

Daeyoon Scale Industrial Co.,Ltd. Chloride-Meter DY-2501B
7
3-3-4. DY-2501B Replacement part & Accessories : (Optional Items)
No. Item, Description
1 Chloride Electrode w/Cable & Connector
2Solution
2-1 Calibration Solution (water-soluble), 0.005% / 0.05% / 0.5% Cl-, 500ml
2-2 Calibration Solution (acid-soluble), 0.005% / 0.05% / 0.5% Cl-,500ml
2-3 Internal Filling Solution, 39ml
2-4 Calibration Solution (water-soluble), 0.005% / 0.05% / 0.5% Cl-, 60ml
2-5 Calibration Solution (acid-soluble), 0.005% / 0.05% / 0.5% Cl-,60ml
2-6 Cleaning Solution, 60ml
2-7 Extraction Solution (water-soluble), 40g
2-8 Extraction Solution (acid-soluble), 40g
3 Printing Roll, 40×57mm, Thermal roll paperΦ

Daeyoon Scale Industrial Co.,Ltd. Chloride-Meter DY-2501B
8
4. User's manual
4-1. Summary
Calibration
POWER
교정 완료
전원 ON
MODE
교정 모드 진입
좌/우 키를 이용
교정모드 선택
CAL
수용성/산-가용성
교정모드 선택
교정 용액 선택 MEASURE
0.005% Cl-
(수용성/산-가용성)
교정
0.05% Cl-
(수용성/산-가용성)
교정
0.5% Cl-
(수용성/산-가용성)
교정
1
0.005% Cl-
(수용성/산-가용성)
MEASURE
2MEASURE
3MEASURE
0.05% Cl-
(수용성/산-가용성)
0.5% Cl-
(수용성/산-가용성)
Water<Cl-/NaCl> Soluble
-> 수용성 교정모드
Acid<Cl-/NaCl> Soluble
-> 산-가용성 교정모드
Over two calibration points selecting option
☞
Power
ON
Select
water-soluble
/acid-soluble
calibration mode
Enter to
calibration mode
Select
Calibration
Solution
0.005% Cl-
(Water-soluble
/Acid-soluble)
Calibration
0.05% Cl-
(Water-soluble
/Acid-soluble)
Calibration
0.5% Cl-
(Water-soluble
/Acid-soluble)
Calibration
Calibration
Complete
0.005% Cl-
(Water/Acid-Soluble)
0.05% Cl-
(Water/Acid-Soluble)
0.5% Cl-
(Water/Acid-Soluble)
Use cursor to select
calibration mode
Water-Soluble Cal. mode
Acid-Soluble Cal. mode

Daeyoon Scale Industrial Co.,Ltd. Chloride-Meter DY-2501B
9
Measurement
POWER
측정 완료
전원 ON
MODE
측정 시작
좌/우 키를 이용
측정모드 선택
수용성/산-가용성
<Cl-/NaCl>
측정모드 선택
시료 측정
①Water<Cl-> Soluble
: 수용성 Cl- 측정모드
② Water<NaCl> Soluble
: 수용성 NaCl 측정모드
③ Acid<Cl-> Soluble
: 산-가용성 Cl- 측정모드
④ Acid<NaCl> Soluble
: 산-가용성 NaCl 측정모드
전처리된 시료
MEASURE
프린터 출력
데이터
자동 저장
데이터
자동 저장
MEMORY
7
PRINT
Power
ON
Select
Water/Acid-Soluble
<Cl
-
-
-/NaCl>
Calibration Use cursor to choose
measurement mode
Measurement
Start
Measurement
Complete
Measuring
Sample
Saving data
automatically
Saving data
automatically
Print out
before
measurement
Water<Cl①->Soluble
: Water-solulbe Cl-mode
Water<NaCl> Soluble②
: Water-soluble NaCl mode
Acid<Cl③->Soluble
:Acid-solubleCl
-mode
Acid<NaCl> Soluble④
: Acid-soluble NaCl mode

Daeyoon Scale Industrial Co.,Ltd. Chloride-Meter DY-2501B
10
Other
Time/Date Input○
FUNCT 4
DATE Input
Time/Date ESC
.
AM / PM mode select
Measure
Electromotive force of the sensor check○
9
mV
FUNCT
Temperature setup (ATC/MTC mode○)
FUNCT 6
TEMP
MODE
Select measurement mode
Select ATC/MTC mode
ATC MTC
ATC : Automatic temperature compensation, MTC : Manual temperature compensation
Load data from Memory○
MEMORY 10 감소 10 증가
1 감소
1 증가
7
PRINT 프린트
Move up
10 record
Move down
10 record
1
decrese
1
increase Print
4-2. Calibration
4-2-1. Water-Soluble Chloride(Cl-) Calibration
MODE
Press “MODE” and use direction
key to select “Water-Soluble” mode
25.0℃
Cl-
ATC 1.
-0.0mV
Water<Cl-> Soluble
25.0℃
CAL
ATC 1.
100%
-0.0mV
Water Calibration
SLP
“Water-Soluble”mode calibration(Cl-) Ready
MEASURE
CAL

Daeyoon Scale Industrial Co.,Ltd. Chloride-Meter DY-2501B
11
25.0℃
CAL3
ATC 1.
100%
-0.0mV
Calibration End
SLP
4-2-2. Acid-Soluble(Cl-) Calibration
MODE
Press “MODE” and use direction
key to select “Acid-Soluble” mode
25.0℃
Cl-
ATC 1.
-0.0mV
Acid<Cl-> Soluble
25.0℃
CAL
ATC 1.
100%
-0.0mV
Acid Calibration
SLP
“Acid-Soluble”mode calibration(Cl-) Ready
MEASURE
CAL
25.0℃
CAL3
ATC 1.
100%
-0.0mV
Calibration End
SLP When calibration is complete, a
"Calibration End" message and SLP
are displayed.
Once calibration is complete, check the accuracy considering the calibration solution as a sample.
If the result is over the accuracy(±10% of reading), check the surface of the sensor and the
status of the calibration solution. Follow the steps described in (1), and repeat calibration.
Allowed accuracy(±10% of reading) during measurement 0.5% : 0.045% ~ 0.055%
Select calibration solution, press number key, and immerse the sensor
in calibration solution. Press "MEASURE" to start calibration.
More than two points must be calibrated.
0.005% Cl-
(Acid-Soluble)
0.05% Cl-
(Acid-Soluble)
0.5% Cl-
(Acid-Soluble)
3
MEASURE
When calibration is complete, it
shows "Calibration End" message
and SLP.
Select calibration solution, press desired number key, and immerse the
sensor in solution. Press "MEASURE" to start calibration.
More than two points must be calibrated.
0.005% Cl-
(Water-Soluble)
0.05% Cl-
(Water-Soluble)
0.5% Cl-
(Water-Soluble)
3
MEASURE
12
12
SLP ? SLP is the sensitivity of the sensor.
The ideal SLP is 100%.
A reading of 90%~110% is acceptable.
ꏊ

Daeyoon Scale Industrial Co.,Ltd. Chloride-Meter DY-2501B
12
!
CAUTION
Denote operating procedures and maintenance must be
followed to secure accuracy and reliability.
Calibration before each use ensures a more accurate
measurement.
!
WARNING
For calibration, use Daeyoon Scale's calibration solution
to avoid malfunction and to secure accuracy and
reliability.
(1) Cause of errors during calibration and troubleshooting
Impurities on the surface of sensor affecting sensor sensitivity or contamination of the
calibration solution may cause inferior calibration results.
Polish the surface of the sensor with sand paper after dripping drops of water on it as it is
shown below for about three minutes.
Clean the surface of the sensor and immerse the sensor in cleaning solution for an hour.
In cases of errors due to the use of contaminated calibrate solutions, change calibration
solutions.
Note : Change the calibration solution frequently to guarantee accuracy and reliability.

Daeyoon Scale Industrial Co.,Ltd. Chloride-Meter DY-2501B
13
4-3. Measurement
4-3-1. Water-Soluble Chlroride(Cl-) Measurement
MODE
Press “MODE” and use direction
key to select “Water-Soluble” mode
25.0℃
Cl-
ATC 1.
-0.0mV
Water<Cl-> Soluble
Water-soluble chloride(Cl-) measurement
Immerse in extracted
sample
MEASURE 25.0℃
Cl-
ATC 1.
0.00mg/Kg
0.0000%
-0.0mV
Water Measure
Standard sieve (<850㎛)
Shake for 10min.
Powered sample
Sample 4g
Water-soluble extraction
solution 40g
For water-soluble chloride, place 4g of the sample to be tested into 40g of the extraction
solution, shake for 10 minutes until sample sink in solution, and start the measurement.
(Refer to ASTM C 1218/C 1218M Standard Test Method for Water-Soluble Chloride in Mortar
and Concrete.)
4-3-2. Acid-Soluble Chloride(Cl-)Measurement
MODE
Press “MODE” and use direction
key to select “Acid-Soluble” mode
25.0℃
Cl-
ATC 1.
-0.0mV
Acid<Cl-> Soluble
Acid-soluble chloride(Cl-) measurement
Immerse in extracted
sample
MEASURE 25.0℃
Cl-
ATC 1.
0.00mg/Kg
0.0000%
-0.0mV
Water Measure
Standard sieve (<850㎛)
Shake for 10min.
Powered sample
Sample 5g
Acid-soluble extraction
solution 40g

Daeyoon Scale Industrial Co.,Ltd. Chloride-Meter DY-2501B
14
For acid-soluble chloride, place 5g of the sample to be tested into 40g of the extraction
solution, shake for 10 minutes until sample sink in solution, and start the measurement.
(Refer to ASTM C 1152/C 1152M Standard Test Method for Acid-Soluble Chloride in Mortar
and Concrete.)
A wide temperature gap between the sample and the sensor might be decreased accuracy of
measurement results and require a longer time for measurement. If the gap isabove10 ,℃
immerse the electrode in the sample until the temperature gap diminishes below 5 before℃
measuring.
4-4. Other Functions
4-4-1. Time and date adjustment.
25.0℃
ATC 1.
Funct Mode
2004. 11. 09.
Date Setting
AM 11 : 25 : 10
4
DATE
FUNCT Press “FUNCT”
Select AM / PM mode
MEASURE
0.0mV AM
Use direction keys to
set time and date
4-4-2. Check electromotive force of the sensor
FUNCT Press “FUNCT”
25.0℃
ATC 1.
Funct Mode
0.0mV
9
mV 25.0℃
ATC 1.
EMF Mode
0.0mV
Press “9” to display sensor output EMF
4-4-3. Temperature setup
FUNCT Press “FUNCT”
25.0℃
ATC 1.
Funct Mode
0.0mV
9
TEMP 25.0℃
ATC 1.
Temp Setting
0.0mV
ATC MTC
Select ATC/MTC mode
4-4-4. LCD back light function
-Press keytoturnontheLCDbacklight.
- Press once to turn on, twice to turn off.
- Meter is not used over 3min,, light turns off automatically.

Daeyoon Scale Industrial Co.,Ltd. Chloride-Meter DY-2501B
15
4-4-5. Load/delete data from memory
(1) Load data from memory
Move down
10 memory
Move up 1 memory
Move up
10 memory
Move down 1 memory
Use direction keys to search for memory
MEMORY Press “MEMORY” key
Memory Read 03
Water<Cl-> Soluble
2005. 01. 05. PM 05:02
EMF : 100.0mV
Result : 0.0000%
100.0mg/Kg
Temp. : MTC 20.0℃
(2) Delete data from memory
MEMORY Press “MEMORY” key
Memory Read 03
Water<Cl-> Soluble
2005. 01. 05. PM 05:02
EMF : 100.0mV
Result : 0.0000%
100.0mg/Kg
Temp. : MTC 20.0℃
Press “0” key three times continuously,
delete all memory(100).
0
SETUP 0 SETUP 0 SETUP
5. Troubleshooting
5-1. Troubleshooting
No. Problem Probable Causes Remedy
1 Calibration Error The procedure of the calibration
was incorrect.
Calibration solution has been
contaminated.
Recalibration
Change the calibration solution.
2 Sensor Error The sensor is disconnected
properly.
Check the connection of the
connector.
3
Sensor Unstable The surface of the sensor
became contaminated.
This may decrease sensitivity of
the sensor.
Polish the surface of the sensor
with sand paper.
-> Cleanjng -> Recalibration
4 Temp. Error The temperature sensor is not
connected properly.
Check the connection of the
connector.
5Temp. Unstable The temperature gap is above
10 between the sample and℃
sensor
Remeasure after the temperature
gap is below 5 .℃
6
‘Measurement has shown
3.0%’
The concentration of the sample
is over the allowed measuring
range.
The sensor cable is broken.
The sensor is not contact with
the sample.
Thesensorisexposedtothe
air.
Dilute the sample before
measurement.
Contact A/S center for repair.
Immerse the sensor deeply in
the sample so that the sensor
contact with the sample.

Daeyoon Scale Industrial Co.,Ltd. Chloride-Meter DY-2501B
16
6. Maintenance
6-1. Storage and treatment of the sensor
The sensor is the most sensitive part of the Chloride-Meter. The following directions for care
should be observed to secure the reliability of the test results when re-using the sensor as
well as to ensure long-term use.
(1) Treatment of the sensor while measuring
- In case you have to stop the test temporarily, immerse the electrode in cleaning solution.
- Always keep the internal solution of the sensor at least 2/3 full.
(2) Storage
- When the sensor is not in use for more than one day, plug refill hole with cap and store
the sensor after put on protection cap.
(3) Re-using the sensor
Immerse the sensor in cleaning solution for an hour before you use.
6-2. Storage of meter
Item Condition
Ambient Temperature -5 ~ 50℃Avoid places where sudden changes in
temperature coour which could cause freezing
or condensation.
Storing Temperature -5 ~ 50℃
Relative Humidity 30 ~ 90%
Environment
The place should be away from direct sunlight and free from
dust, corrosive gas, inflammable gases oil mists, steam, dripping
water or vibration, salty environments should be preferably be
avoided.
7. Warranty and A/S
7-1. Quality certification
(1) A quality certificate for this meter is included in the box.
(2) The warranty is valid for one year from the day of purchase. It covers defective parts of
the sensor which occurs within the warranty period. This warranty extends only to the original
retail purchaser.
However, it does not cover the misuse, abuse, negligence, modification of the sensor, or any
defects caused by a natural disaster. After the applicable period you must pay for A/S.

Daeyoon Scale Industrial Co.,Ltd. Chloride-Meter DY-2501B
17
(3) Any A/S which is conducted after the warranty period is chargeable according to Daeyoon
Scale's guidelines.
7-2. A/S Reporting and Counseling
(1) If you encounter any problems or malfunctions while using the chloride-Meter, call the
A/S center (822-858-6284~5) or visit the store where you made your purchase.
Warning!! Never modify the meter by yourself without proper instructions.
(2) If you have any questions regarding the use of this product, call the A/S center
(822-858-6284~5) or the business department (822-858-6870~1).