Microprocessor Benchtop Manualimg.daihan-sci.com/allforlab/pdf/Cond_meter_SC-2300_man_en.pdf ·...

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Microprocessor

Benchtop Conductivity/

Resistivity Meter SC-2300

Operation Manual

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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 Tref 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【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 = C25 1+β( T – 25 )

T Temp. of the tested solution β Temp. Coefficient Formula 2: β = ( Ct－C25 ) / C25 ( 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(C25) 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

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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 enter measurement 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 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 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 or to modify the

hour, then push【ENT】to confirm it

Push or to modify the year,

then push【ENT】to confirm it


month, then push【ENT】to confirm it


date, then push【ENT】to ensure

Back to “Setting of measurement mod, or push 【MODE】to back to measurement mode

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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


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(Data Clean)

(Initial Setting)

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Block diagram of calibration and temperature compensation settings

Settings in conductivity mode Settings in specific resistivity

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Measurement mode

Push↑↓ to adjust compensation coefficient


Power on

Measurement mode

Push【ENT】+【CAL】


：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 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 or to select






Push or to select


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 circularly among 4 modes

After transmission, back to the measurement mode


mode

Appear recently stored data

Push or to

modify the inquiry site

Read the ID, and push or

to inquire other data through ID

Read the stored year

Read the stored date

Read the stored time

Appear the original ID


Push or to set the ID number

Transmission mode

Power on

Data store full Auto store Push 【ENT】+【STO】

Manual store push【STO】

Storage

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


After transmission, back to the measurement mode automatically

CELL direct calibration

Std simple point calibration

Std five point calibration

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mode


mode

：ENTER key

Push or to set the minute

Continual transmission

Cancel continual storage

Push or to set the second

Push【ENT】+【RCL】

Auto transmissionPush【ENT】+【RCL】

If twinkles, it means that the data is stored


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 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 enter 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)


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


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.


Push【ENT】

Push 【ENT】to read the temperature value of the data

Push or to set the minute,

and push【ENT】for confirmation and 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


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】


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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 year

appears

Push【ENT】, show the calibration value of Buffer 2.

If there is no data, it will show “NULL.”









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5. Calibration Block diagram of Calibration

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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


Use ↑↓keys to select known standard solution value






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 selectknown standard solution value



Push【MODE】


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





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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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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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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 Terminal】, and the display will show a window of “Hyper Terminal”.

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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Microprocessor Benchtop Manualimg.daihan-sci.com/allforlab/pdf/Cond_meter_SC-2300_man_en.pdf ·...

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