Apera Instruments WS200 User manual

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WS200 Fluoride/pH/Conductivity
7-in-1 Portable Meter Kit
Instruction Manual
APERA INSTRUMENTS, LLC
www.aperainst.com

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Table of Contents
1Overview.........................................................................................................................- 3 -
1.1 Basic Functions .................................................................................................................... - 3 -
1.2 Features of Fluoride Measurement ....................................................................................... - 3 -
1.3 Features of pH measurement ............................................................................................... - 3 -
1.4 Features of Conductivity Measurement ................................................................................ - 3 -
2Technical Parameters：...................................................................................................- 4 -
2.1 Fluoride ............................................................................................................................... - 4 -
2.2 pH ....................................................................................................................................... - 4 -
2.3 mV：................................................................................................................................... - 4 -
2.4 Conductivity: ....................................................................................................................... - 4 -
2.5 Other technical parameters: ................................................................................................. - 5 -
3Instrument Description ....................................................................................................- 5 -
3.1 LCD Display：...................................................................................................................... - 5 -
3.2 Operation keys..................................................................................................................... - 5 -
3.3 Memory Storage, Recall Memory, and Clear Memory: 3.3.1 Memory Storage：.................... - 6 -
4Fluoride concentration measurement ..............................................................................- 7 -
4.1 Preparation.......................................................................................................................... - 7 -
4.2 Calibration ( mg/L for example) ............................................................................................ - 7 -
4.3 Sample Measuring ............................................................................................................... - 8 -
4.4 Parameter settings............................................................................................................... - 8 -
4.5 Special Notes....................................................................................................................... - 8 -
5pH Measurement.............................................................................................................- 9 -
5.1 Preparing the Meter............................................................................................................. - 9 -
5.2 Meter Calibration................................................................................................................. - 9 -
5.3 Sample Test........................................................................................................................ - 11 -
5.4 Parameter Settings............................................................................................................. - 11 -
5.5 Special Notes..................................................................................................................... - 14 -
5.6 The Self-diagnose Information.......................................................................................... - 16 -
6mV Measurement..........................................................................................................- 16 -
6.1 Sample Test........................................................................................................................ - 16 -
7Conductivity Measurement:...........................................................................................- 17 -
7.1 Preparation Work............................................................................................................... - 17 -
7.2 Meter’s Calibration ............................................................................................................ - 17 -
7.3 Sample Test:...................................................................................................................... - 17 -
7.4 Special Notes ..................................................................................................................... - 18 -
7.5 Parameter Setting: ............................................................................................................. - 19 -
7.6 .......................................................................................................................................... - 19 -
7.7 Considerations:.................................................................................................................. - 22 -
8Complete Kit..................................................................................................................- 23 -
9Warranty .......................................................................................................................- 23 -
10 Appendix 1. Fluoride Concentration Conversion Table.................................................- 24 -

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1 Overview
Thank you for purchasing the Apera Instruments WS200 pH/Condivity/Fluoride 7-in-1 Portable Meter (Hereon
after referred as the meter). Before using the product, please read this manual carefully to help you properly use and
maintain the instrument For technical support, please contact us at [email protected]om or [phone].
Apera Instruments reserves the right to update the content of this manual without giving prior notices.
The WS200 meter is widely used for drinking water, surface water and other water treatment applications, ideal for
both in-field and laboratory testing.
1.1 Basic Functions
◼Automatic calibration and temperature compensation (ATC), data storage, self-diagnostics,
automatic shutdown, low-battery reminder
◼Adopting digital filtering and intelligence to improve the instrument's responsiveness and
accuracy of measurement data, measured value display when stable " " Icon.
◼Meets IP57 Waterproof and dustproof rating, ideal for use under harsh environment.
1.2 Features of Fluoride Measurement
◼Patented structure of the 3-in-1 ion electrode contains: ion-selective electrode, reference
electrode, and temperature electrode. This design generates quick stability, fast response, and is
easy to use.
◼no need for stirring or added reagents, directly measuring the ion concentration of fluoride in a
quick and simple manner, directly measure the fluoride concentration with three different
units: mg/L, ppm and pF.
1.3 Features of pH measurement
◼1-3 points of automatic calibration, with calibration icons and self diagnosis function.
◼Automatic recognition of up to 12 different pH standard buffer solutions, there are three
series of standard buffer solutions to choose from: U.S.A, NIST, and China.
1.4 Features of Conductivity Measurement
◼1-3 points of automatic calibration, with calibration icons and self diagnosis function.
◼Automatically recognize up to 8 kinds of conductivity standard solutions. User can choose
from two series of standard solutions: Europe & USA and CHINA.
◼Automatically adjusts conductivity measuring range, the meter will do perform automatic
temperature compensation test for purified water and high purified water less than
10μS/cm, which greatly improves the measuring accuracy. It is especially suitable for use
in electrical power, microelectronics, and medicine industries.

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2 Technical Parameters：
2.1 Fluoride
Measuring range
0.02 ppm to 1900 ppm
Display units
mg/L, ppm, pF
Accuracy
±0.02 ppm or ±5% of reading (which ever is greater)
Temperature
Compensation Range
(0-80 ) ℃ ( Automatic)
2.2 pH
Measuring range
(-2.00 - 19.99 )pH
Resolution
0.1/0.01 pH
Accuracy
± 0.01 pH ± 1 digit
Temperature Compensation Range
(0 - 100 )℃(Automatic)
2.3 mV：
Measuring range
-1999mV ~ 0 ~ 1999mV
Resolution
1mV
Accuracy
±0.1% FS
2.4 Conductivity:
Measuring Range
Conductivity：（ 0.00~19.99）μS/cm （20.0~199.9）μS/cm
（200~1999）μS/cm （2.00~19.99）mS/cm
（20.0~199.9）mS/cm
TDS: （0 ~ 100）g/L Salinity：（0 ~ 100）ppt
Resistivity：（ 0 ~ 100）MΩ·cm
Resolution
0.01/0.1/1μS/cm 0.01/0.1 mS/cm
Accuracy
±1.0% F.S
ATC Range
（0 - 50）℃（Auto）
Electrode Constant
0.1 / 1 / 10 cm-1
Standard Temperature
25℃、20℃ and 18℃

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2.5 Other technical parameters:
Data Storage
800 Groups
Storage Content
Numberings, measurements, units of measurement and a
temperature values
Power Supply
AA Battery (1.5VX2)
Size and Weight
Instrument:(65X120X31) mm/180g ; Suitcases:(360X270X76)
mm/1.5Kg
Quality and Safety
Certification
ISO9001:2000,CE and CMC
IPClass
IP57 Dustproof and waterproof
3 Instrument Description
3.1 LCD Display：
①—— Parameter mode
②—— Measuring value
③—— Measured value storage and display of numbers, symbols indicate:
M+—Store Measured value
RM - Recall measurement values Icon ;
④—— Measurement unit
⑤—— Temperature measurement and unit
⑥—— Smiley face; icon indicates stable readings
⑦—— Instrument calibration indicator
⑧—— Low battery reminder
3.2 Operation keys
The meter has 5 operation keys in total.

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3.2.1 — Switch on / off key
3.2.2 — Calibration key
（a）When in the measurement mode, press this key to enter into calibration mode.
（b）When in the parameter setting mode, press this key to change the number or the ON/OFF
state.
3.2.3 — Function key
(a) When in pH measuring mode, short press to change measurment parameters, long press this
key to enter into parameter setting mode P1, P2, P3 ……
(b) When in Conductivity measuring mode, press this key to enter into parameter settings mode
P1, P2, P3 ……
(c) When in Fluoride measuring mode, press this key to enter into parameter setting mode P1,
P2, P3 ……
3.2.4 — Backlight and enter key
(a) When in the measuring mode, short press (< 1.5s ) to turn the backlight display on or off;
(a) When in the calibration mode or the parameter setting mode, press this key to confirm, and to
make the meter enter into measuring state;
(c) When in pH measuring mode, press this key to change resolution simultaneously: 0.01→0.1
pH
(d) When in Conductivity measuring mode, press this key to change parameter simultaneously:
TDS→SAL→RES→COND.
(e) When in Ion measuring mode, press this key to change parameter mode simultaneously: mg/L
→ ppm → pX
3.2.5 — The combination key of memory storage and recall memory.
（a）When in the measurement mode, short press this button (< 1.5s) to save the measuring data.
Long press this button(＞2s) to display the stored measuring data.
(b) When in the parameter setting mode, press this button to change the unit % → mol → g/cm3
→ g/L or turn the meter ON/OFF.
3.3 Memory Storage, Recall Memory, and Clear Memory:
3.3.1 Memory Storage：
While in the measurement mode, when the measuring data is stable and the smiley face icon appears,
short press key(＜1.5s), LCD will display “ M+ ” icon and a storage serial, and meanwhile
storing all of the measuring information. It can store up to 300 groups.

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3.3.2 Display measuring information：
(a) While in the the measurement mode, long press (＞2s), meter will display the last stored
information, and the storage number and “RM” icon will appear in the lower right corner of the LCD,
and the complete measuring information. Again short press or
meter will in turn display all the measuring data, Hold or to quickly check the
measuring data.
(b) In the data displaying mode (there are “ RM ” and storage number in the upper right corner of
the LCD), press key to return to the measuring mode.
3.3.3. Clear the stored measuring information: In the data displaying mode, press the key for
5 seconds, LCD will appear CLr for 2 seconds. It means that all the storage has been eliminated,
and returns to measuring mode.
4 Fluoride concentration measurement
4.1 Preparation
4.1.1 Press key to start , connect F501 -fluoride ion electrode; the meter automatically
switches to the fluoride concentration measurement mode.
4.1.2 Hold to change fluoride concentration unit from mg/l, ppm to pX , release the button
after selection.
4.1.3 Activate the electrode in 19.00mg/L calibration solution for about 10-20 minutes (as long as
the smiley face icon stays stably on the screen) before calibration and measurement. (Please note
that the display value during activation is random).
4.2 Calibration ( mg/L for example)
4.2.1 Press , LCD displays " 0.19 mg/L ", and LCD top right corner CAL and the bottom
left Lwill be flashing, indicating that the meter has entered the 1th point calibration mode and the
calibration solution is 0.19 mg/l; Rinse the fluoride-ion electrode in distilled or deionized water and
shake off the excess water; dip the electrode into 0.19 mg/L calibration solution, stir gently and let
it stand still. When measuring value is stable and icon stays on screen , then
press key again, End and 19.0 mg/L will be displayed after a few seconds. While LCD top
right corner CAL and bottom left corner Hflashing, indicating the meter has entered the 2nd
calibration mode and the calibration solution is 19.00 mg/L.
4.2.2 Dry the fluoride-ion electrode with clean tissue paper, dip into 19.00 mg/L Calibration
solution, stir gently and and let it stand still, when the reading is stabile and stays on screen ,
then press , after a few seconds End shows up, indicating the end of calibration; LCD left

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corner shows two-point calibration icons Land H; The instrument automatically enters measuring
mode.
4.3 Sample Measuring
4.3.1 Rinse the fluoride-ion electrode in distilled or deionized water and dap off excess water
with clean tissue; soak into solution, stir gently and let it stand still; get the readings
when measuring vaule is stable and stays on screen.
4.3.2 Hold to show Fluoride concentrations in different units, release after selection.
4.3.3 Short press key, the meter enters the mV mode and displays the mV value of the
fluoride ion concentration.
4.4 Parameter settings
Table (4-3)
Symbol
Parameter sets the project
Code
Parameters
P1
Temperature unit selection
℃ ℉
P2
Backlight display time setting
0-1-3-6 min
P3
Auto power off time setting
0-10-20 min
P4
Restore to factory default
settings
OFF-ON
4.4.1 Temperature units ° c/ºf selection (P1)
Long Press to enter P1，remaining operations see section 5.4.5
4.4.2 Backlight display time setting (P2)
In P1, long press to enter P2，remaining operations see section 5.4.6
4.4.3 Auto-off time setting (P3)
In P2, press to enter P3，remaining operations see section 5.4.7
4.4.4 Restore factory default (P4)
In P3, press to enter P4，remaining operations see section 5.4.8
4.5 Special Notes
4.5.1 The meter does not automatically recognize calibration solutions. Pleae make sure to use
correct solution according to the displayed reminders "0.19 mg/L " or " 19.00 mg/L ".

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4.5.2 The calibration solution can be easily polluted, especially for low concentration solution
(0.19 mg/l). Please pay attention to avoid contamination otherwise a large measuring error will
occur. Replace the solution after 4~5 times of use.
4.5.3 When test solution in the order from low-concentration to high-concentration, the electrode
does not need to be rinsed, just shake off or dry the excess solutions with clean tissue. If it’s from
high-concentration to low-concentration, you need to rinse the electrode with distilled or deionized
water, otherwise it will affect the accuracy significantly.
4.5.4 Typically the meter needs to calibrated before use. But when requirement of accuracy is low,
calibration is not necessary. Or try the electrode in the calibration solution, if the error is very small,
calibration is not necessary.
4.5.5 According to the theory of Isothermal measurements of ion-selective electrode, the smaller
the difference of temperature between test solution and the calibration solution, the higher the
measument accuracy is. Typically, temperature difference between test solution and calibration
solution should ≤±15℃; for high accuracy measurement, the temperatures should be the same.
4.5.6 When test is completed, dry electrode and store with the cap on.
4.5.7 When the meter is functioning abnormally, please set P4 as “ON” to restore the meter to
factory default mode, and then perform calibration and measurements again.
5 pH Measurement
5.1 Preparing the Meter
5.1.1. Connect the 201T-S pH Electrode to the meter; loosen the cap of the storage bottle of
electrode; screw off the storage bottle; Press to turn on meter.
5.2 Meter Calibration
5.2.2. Use distilled water to rinse off electrode and then dry it with clean tissue, then soak it into
the pH7.00 buffer solution, stir the electrode gently and let it stand still,
5.2.1. Press to enter calibration mode, LCD displays C1, indicating the first point of
calibration; Wait for a stable reading and to appear and stay, then press again ,

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the LCD will show a blinking 7.00 pH, indicating the 1st point of calibration is completed;
a stable pH value and a blinking C2 will be displayed, indicating the first point calibration
has been finished and the meterenters the second point of calibration.
5.2.3. Rinse the pH electrode in distilled water and dry it, then soak it into the pH4.00 buffer
solution, stir the electrode gently and let it stand still,, waiting for a stable reading and a
smiley face icon to appear and stay, then again press , the LCD will show a blinking
4.00 pH, a stable pH value and a blinking C3 will be displayed, indicating the second-
point calibration has been finished and the meter enters the third-point calibration.
5.2.4. Rinse the pH electrode in distilled water and dry it, then soak
it into the pH 10.01 buffer solution, stir the electrode gently
and let it stand still,, waiting for a stable reading and a smiley
face icon to appear and stay, then again press , the
LCD will show a blinking 10.01 pH. A stable reading and L M H calibration icons will be
displayed, see picture (4-1), indicating the three-point calibration has been finished and the
meter automatically returns to measuring mode.
5.2.5. Notes
(a) This meter can perform one-point, two-point or three-point automatic calibrations. After the
first point calibration (see item 5.2.2.), press to confirm one-point calibration and
return to measuring mode. The indication icon M standing for one-point calibration will
appear on the lower left corner of LCD. When the requirement of accuracy is ≤±0.1pH,
users can perform a one-point calibration with the pH7.00 buffer solution.
(b) After the second-point calibration, (see item 5.2.3.), press to confirm two-point
calibration and return to measuring mode. The indication icon L and M for twp-point
calibration will appear on the lower left corner of LCD. User can choose pH4.00 and pH7.00
to calibrate if the measurement is within the acidity range and choose pH7.00 and pH10.01
to calibrate if within the alkalinity range.

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(c) Users should perform a three-point calibration to reach a more accurate measurement if the
measuring range is wide, or if the electrode has been used for long or has aging phenomenon.
If it’s a new electrode, a three-point calibration is necessary to adjust the meter’s slope to
match the pH electrode.
5.3 Sample Test
Soak the pH electrode into the sample solution after rinsing and drying, hold the electrode
still. Take the readings when the smiley face icon shows up and stays on screen (indicates a
stable reading).
pH isothermal measurement principle
According to the theory of Isothermal measurements, the smaller the difference of the
temperatures between test solution and the calibration solution, the higher the measument
accuracy is. Typically, temperature difference between test solution and calibration solution
should ≤±15℃; for high accuracy measurement, the temperatures should be the same.
5.4 Parameter Settings
5.4.1. pH measuring parameter setting (Chart (5-1))
Chart (5-1)
Prompt
Mark
Parameter Setting Items
Code
Parameters
P1
pH buffer solution series selection
SOL
USA(U.S.A series)
NIS (NIST series)
CH (China series)
P2
Purified water pH temperature
compensation setting
PU1
OFF-On
P3
Ammonia added purified water
pH temperature compensation
setting
PU2
OFF-On
P4
Temperature unit setting
℃ ℉

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P5
Back light display time setting
BL
0-1-3-6min
P6
Auto power off setting
AC
0-10-20min
P7
Restore to Factory Default
OFF-On
5.4.2. pH buffer solution series selection (P1)
(a) Press key, meter enters P1 mode: see picture (4-2).
(b) Press or key to choose buffer solution series:
( Europe & U.S.A series) —1.68, 4.00, 7.00,10.01 and 12.45 pH
(NIST series) — 1.68, 4.01, 6.86, 9.18 and 12.45 pH
( (China series) — 1.68, 4.00, 6.86, 9.18 and 12.46 pH
(c) Press key to enter next parameter setting or press key to confirm and return to
measuring mode.
5.4.3. Purified water pH temperature compensation setting (P2)
(a) Short press key in the mode P1, the meter enters mode
P2, see picture (4-3).
(b) Press or to choose ON or OFF.
(c) Press key to enter next parameter setting or press key to confirm and return to
measuring mode.
(d) The default setting is “ OFF ”.
Note: A PU-1 icon will appear in the upper right corner of the LCD if purified water
temperature compensation function is set by the user.
5.4.4. Ammonia added purified water pH temperature compensation
setting (P3)
(a) Short press key in mode P2 to enter mode P3, see
picture (4-4).
(b) Press or key to choose ON or OFF
(c) Press to enter next parameter setting or press key to confirm and return to

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measuring mode.
(d) The default setting is “ OFF ”.
Note: A PU-2 icon will appear in the upper right corner of the LCD if purified water
temperature compensation function is set by the user.
5.4.5. Temperature unit ℃/℉ setting (P4)
(a) Short press key in mode P3 to enter mode P4, see picture
(4-5).
(b) Press or key to choose temperature unit: ℃ or ℉.
(c) Press key to enter into next parameter setting or press key to confirm and
return to measuring mode.
5.4.6. Backlight display time setting (P5)
(a) Short press key in mode P4 to enter mode P5, see
picture (4-6).
(b) Press or key to choose the time of back light auto
power off: 0 min, 1 min, 3min or6 min. Theback light display
function will be closed if choosing a 0min.
(c) Press key to enter into next parameter setting or press key to confirm and
return to measuring mode.
(d) The producer setting for P5 is 1min.
5.4.7. Auto power off time setting (P6)
(a) Short press key in mode P5 to enter into mode P6, see
picture (4-7).
(b) Press or key to choose the time: 0min, 10min
or 20min. The auto power off function will be closed if
choosing 0min.

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(c) Press key to enter into next parameter setting or press key to confirm and
return to measuring mode.
(d) The producer setting for P6 is 10min.
5.4.8. Restore to producer setting (P7)
(a) Short press key in mode P6 to enter into mode P7, see
picture (4-8).
(b) Press or key to choose “ ON”, means that all the
pH measuring parameters have been restored to the factory
default setting.
5.5 Special Notes
5.5.1. The frequency that you need to calibrate your meter depends on the tested samples, performace
of electrodes, and the requirement of the accuracy. For high-accuracy meaustements (≤ ±0.02pH), the
meter should be calibrated before test every time; For ordinary-accuracy measurements (≥±0.1pH),
once calibrated, the meter can be used for about a week or longer. In the following cases, the meter
must be re-calibrated before testing:
a) The electrode hasn’t been used for a long time or a new electrode is connected.
b) After measuring strong acid (pH<2) or strong base (pH>12) solutions.
c) After measuring fluoride-containing solution and strong organic solution
d) There is a significant difference between the temperature of the test sample and the temperature
of the buffer solution that is used in the last calibration.
5.5.2. The soaking solution contained in the supplied protective bottle is used to maintain activation
in the glass bulb and junction. Loosen the capsule, remove the electrode and rinse in distilled water
before taking a measurement. Insert the electrode and tighten the capsule after measurements to
prevent the solution from leaking. If the soaking solution is turbid or moldy, replace the KCL solution
(Product# AI1107).
5.5.3. For calibration accuracy, the pH of the standard buffer solution must be reliable. The buffer
solution should be refreshed often, especially after heavy use. We recommend 10-15 times of use
before replacing the pH buffers.

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5.5.4. Always keep the meter clean and dry; especially around the socket connecting the meter and
electrode, otherwise it may lead to inaccurate measurements or a damaged probe/meter. To clean, dry
them with medical cotton and rubbing alcohol if the connectors appear dirty.
5.5.5. The sensitive glass bulb at the front of the combination electrode should not come in contact
with hard surfaces. Scratches or cracks on the electrode will cause inaccurate readings. Before and
after each measurement, the electrode should be rinsed with distilled water and dried. If a sample
sticks to the electrode or it’s contaminated, the electrode should be thoroughly cleaned using a soft
brush with soap water and then rinsed with distilledwater. After that, soak it in the KCL solution again
for 6 hours.
5.5.6. An electrode be used for a long time, or measured solution which contains a polluting solute
easily for the sensitive bulb, or a substance resulting in jam at the junction, the electrode will be
getting passivated, its sensitivity will decrease and its response is getting slow, the reading are not
correct. Users could adopt the following methods to clean in various cases:
(a) Electrodes that have been used over a long period of time will become aged. Submerge the
electrode in 0.1mol/L hydrochloric acid for 24 hours, then rinse the electrode in distilled water, then
submerge it in 3M KCL soaking solution for 24 hours.
(b) The method to prepare 0.1mol/L hydrochloric acid: dilute 9mL hydrochloric acid in distilled or
deionized water to 1000mL.
For serious passivation, submerge the bulb in 4% HF (hydrofluoric acid) for 3-5 seconds, and rinse it
in distilled water, then submerge it in the 3M KCL soaking solution for 24 hours to renew it.
Clean contaminated glass bulb and junction (please refer to Table-8)
Table-8 Clean contaminated glass bulb and junction
Contamination
Cleaning Solutions
Inorganic metal oxide
Dilute acid less than 1mol/L
Organic lipid
Dilute detergent (weak alkaline)
Resin macromolecule
Dilute alcohol, acetone, ether
Proteinic haematocyte sediment
Acidic enzymatic solution (saccharated yeast tablets)
Paints
Dilute bleacher, peroxide

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5.5.9. The lifespan period for the 201T-S pH Electrode is about 1-1.5 year, but its life will be
shortened if the meter is used incorrectly or is not well maintenained. be sure to replace the
electrode once it has aged or tested inaccurately
5.5.10. When an abnormal reading appears during calibration or measurement, please set P7 to
“ON” to restore the meter to Factory Default settings, then re-calibrate the meter before
measurement.
5.6 The Self-diagnose Information
When using the meter, the following icons might appear. This is the meter’s self-diagnose
information, which helps users identify problems occurring with the meter or the electrode when
using:
5.6.1. The stable icon of -2.00 pH or 19.99 pH — this icon appears when the value has surpassed
the measuring range. There will also appear such signs when the electrode is not well
connected with the meter or when the electrode is not immerged into the solution. This is a
normal phenomenon.
5.6.2. “Err1” — Abnormal electrode zero potential (<-60mV or >60mV)
5.6.3. “Err2” — Abnormal electrode slope (< 85% or >105%)
When “Err1” or “Err2” appears, the meter can not work properly, please take the following
steps to check and fix the problem:
(a) Check if the electrode bulb has air bubble, if has, please shake the electrode with force for a
few times to eliminate the air bubble inside the sensor.
(b) Check the quality of buffer solution, if it is expired or contaminated. If so, please replace
with new ones.
(c) Set the meter to factory default mode then recalibrate it.
If the meter still can not recover to the normal state after doing the above steps, please replace a new
pH electrode.
6 mV Measurement
6.1 Sample Test
6.1.1. Press key to turn on, and short press to switch to mV mode;

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6.1.2. Connect the ORP probe (Product# AI1315, sold separately), soak it into sample solution, stir
gently and let it stand still. Get the readings when the smiley face ion appears and stay on
the screen.
7 Conductivity Measurement:
7.1 Preparation Work
7.1.1. Press key to turn on the meter;
7.1.2. Connect the 2301-S conductivity electrode into the meter.
7.2 Meter’s Calibration
Press key, “ CAL” will be flashing on the LCD, indicates the meter enters the calibration
mode; rinse the conductivity electrode with distilled or deionized water and dry it with clean
tissue, then insert it into the 1413μS/cm calibration solution, hold still after stirring, when a
smiley face icon appears and stays, press again, LCD will display flashing “1413μS/cm ”
and End icon after a few seconds. And the meter will return to measuring mode automatically.
Note: (1) The meter’s conductivity mode has been calibrated before leaving factory, so
generally users can use it directly.
(2) The conductivity can only can be calibrated under the mode of COND. Resistivity
(RES), TDS, Sailinity (SAL) are coverted from conductivity so they don’t need
calibration as long as conductivity is calibrated.
7.3 Sample Test:
7.3.1. Connect the 2301T-S probe to the meter, soak it into sample solution, stir gently and let it
stand still. Get the readings when the smiley face ion appears and stay on the screen.
7.3.2 Press key to displaythe value of TDS, salinityor resistivity, which are converted from
conductivity.

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7.4 Special Notes
7.4.1. This meter build-in below two kinds of calibration solution series, please set up in the
parameters P1;
(a) (Europe & U.S.A. series) —84μS/cm, 1413μS/cm, 12.88 mS/cm and 111.9 mS/cm
(b) (China series) —146.6μS/cm, 1408μS/cm, 12.85mS/cm and 111.3 mS/cm
7.4.2. This meter has a unique one-point calibration function, to choose one calibration solution
whose conductivity is close to the test samples. In general the most common calibration
solution is 1413 μS/cm. Use the equipped 2301-S conductivity electrode (K = 1 cm-1), and
do calibration with 1413 μS/cm calibration solution, the range can reach up to 100 mS/cm.
Chart (7-1)
Measuring range
0.05 to 20μS/cm
0.5μS/cm to 200mS/cm
Electrode constant
K=0.1cm-1(flow test)
K=1.0cm-1
Calibration solution
84μS/cm
84μS/cm
1413μS/cm
12.88 mS/cm
111.9 mS/cm
Calibration
indication icon
7.4.3. The temperature compensation coefficient of the meter setting is 2.00%/℃ by default.
However, the conductivity temperature coefficient is different for different solutions. Users
can refer chart (7-2), as well as the data which they receive from experiments to set in the
parameters setting of P4. At the same time, meter will do automatic non-linear temperature
compensation in the high purified water which less than 10 μ S / cm.
Note: When the coefficient of temperature compensation is set to be 0.00, that is, there is
no temperature compensation when testing, the measuring value is based on current
temperature.

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Chart (7-2)
Solution
Temperature compensation coefficient
NaCl salt solution
2.12%/℃
5%NaOH solution
1.72%/℃
Dilute ammonia solution
1.88%/℃
10% hydrochroric acid solution
1.32%/℃
5% sulfuric acid solution
0.96%/℃
7.4.5.The other parameters setting, please see the chart (7-3)
7.4.6. Special attention: when the content of parameter setting is
consistent with content of factory default setting, conductivity
measuring interface will display as picture (6-1); when the
content of parameter setting is different with content of factory
default setting, conductivity measuring interface will display as
picture (6-2); the code icon will appear on the upper right of
LCD, when parameters with code icon to be set more than two,
LCD just displays one of the codes; user should enter the
parameter setting and carefully check the contents of setting or
restore the meter to factory default setting and set up the parameters again.
7.5 Parameter Setting:
7.5.1. Conductivity parameter setting (chart (7-3))
Chart (7-3)
Prompt Mark
Parameter Setting Items
Code
Parameter
P1
Standard solution series
selection
7.6
USA (84μS/cm, 1413μS/cm, 12.88
mS/cm, 111.9 mS/cm)
CH (146.6μS/cm, 1408μS/cm,
12.85mS/cm, 111.3mS/cm)
P2
Electrode constant selection
0.1, 1, 10
P3
Benchmark temperature
selection
25℃ 20℃ 18℃
Picture (6-1)
Picture (6-2)

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P4
Temperature compensation
coefficient setting
0.00 to 9.99%
P5
Electrode constant setting
CC
P6
Temperature unit setting
℃ ℉
P7
Back light display time setting
BL
0-1-3-6min
P8
Auto power off time setting
AC
0-10-20min
P9
Restore to producer setting
OFF-On
7.5.2. Conductivity calibration solution series selection (P1)
(a) Press key, meter enters P1 mode, see picture (4-3);
(b) Press or key to choose the standard solution series:
— Europe & U.S.A. series — China series
(c) Press key to enter the next parameter setting or press key
return to measuring mode.
7.5.3. Electrode constant selection (P2)
(a) Under P1 mode to short press the key and enters P2 mode,
see picture (4-4);
(b) Press or key to change the constant setting:
0.1→1.0→10.0.
(c) Press key to enter the next parameter setting or press key to return to
measuring mode.
(d) The producer setting of P2 is K=1.
7.5.4. Benchmark temperature selection (P3)
(a) Under P2 mode to short press key to enter P3 mode, see
picture (4-5);
(b) Press or key to choose the benchmark temperature:
25℃→20℃→18℃;
(c) Press key to enter into the next parameter setting or press key return to
Picture (6-3)
Picture (6-4)