Apera Instruments SX823-B User manual

SX823-B
pH/Conductivity Portable Meter
Instruction Manual
APERA INSTRUMENTS, LLC
www.aperainst.com
v2.1

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1!Brief'Introduction'...................................................................................................................'3!
1.1!Basic'Features'...............................................................................................................................'3!
1.2!pH'Measurement'Features'............................................................................................................'3!
1.3!Conductivity'Measurement'Features'.............................................................................................'3!
2!Specifications'..........................................................................................................................'4!
2.1!Main'specifications'.......................................................................................................................'4!
2.2!Other'specifications'......................................................................................................................'4!
3!Instrument'Description'...........................................................................................................'5!
3.1!LCD'Display
：
'...............................................................................................................................'5!
3.2!Keypad'functions'..........................................................................................................................'5!
3.3!Meter'socket'.................................................................................................................................'6!
3.4!Reading'Stability'Display'Mode'.....................................................................................................'7!
3.5!Automatic'Lock-Up'Display'Mode'..................................................................................................'7!
3.6!Automatic'Power-off'.....................................................................................................................'7!
3.7!Temperature'Adjustment'..............................................................................................................'7!
4!pH'Measurement'....................................................................................................................'7!
4.1!Preparation'...................................................................................................................................'7!
4.2!pH'Electrode'Information'..............................................................................................................'7!
4.3!Calibration'Information'.................................................................................................................'9!
4.4!pH'Meter'Calibration'(with'an'example'of'three-point'calibration)'..............................................'10!
4.5!Sample'Test'.................................................................................................................................'11!
5!mV'Value'Measurement:'......................................................................................................'13!
6!Conductivity'Measurement:'..................................................................................................'14!
6.1!Conductivity'Electrode'Information'.............................................................................................'14!
6.2!Conductivity'Calibration'..............................................................................................................'14!
6.3!Conductivity'Calibration'(take'1413μS/cm'as'an'example)'...........................................................'16!
6.4!Relations'between'TDS'and'Conductivity'....................................................................................'16!
6.5!Sample'test'.................................................................................................................................'17!
6.6.'Conductivity'electrode'maintenance'...............................................................................................'17!
7!Parameter'setting'.................................................................................................................'18!
8!Meter'Kits'.............................................................................................................................'21!
9!Recommended'pH'Electrodes'for'Specific'Applications'.........................................................'21!
10!Warranty'...........................................................................................................................'22!
11!Appendix'I:'Parameter'setting'&'Factory'default'setting'....................................................'22!
12!Appendix'II:'Abbreviation'Glossary'....................................................................................'23!
13!Appendix'III:'Self-diagnosis'information'............................................................................'23!

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1 Brief Introduction
Thanks for purchasing SX823-B pH/Conductivity portable meter.
This meter is an outstanding combination of advanced electronics and sensor technology, and software
design, and is the most cost-effective portable electrochemical meter designed for industrial and mining
enterprises, power plants, water treatment engineering, environmental protection industry, etc.,
especially ideal for general field use.
In order to use and maintain the instrument properly, please read the manual carefully before use.
1.1 Basic Features
● The microprocessor-based portable meter features automatic
calibration, automatic temperature compensation, parameter setup,
self-diagnostics, automatic power-off and low voltage display.
The meter is able to measure up to 3 parameters simultaneously
and switch displays effortlessly. Please see Diagram -1:
two electrodes at most can be fit into the clip to measure 3 parameters
simultaneously.
● The meter’s digital filter improves measurement speed and accuracy. There is a stable reading
indication (smiley face) on the display.
● The package includes a portable case, a meter, two electrodes, standard solutions and all
accessories, which is convenient to use in field.
● The meter is dust proof and waterproof, meeting the IP57 rating.
1.2 pH Measurement Features
● 1-3 points automatic calibration, the meter provides calibration guide and automatic checking
function.
● The meter is able to recognize pH standard buffer solutions automatically. USA series and NIST
series buffer solutions can be selected.
● The meter provides three types of reading stability criteria.
1.3 Conductivity Measurement Features
● 1-4 points automatic calibration, the meter provides calibration guide and automatic checking
function.
● The meter is able to switch between conductivity and TDS.
● The meter is able to recognize conductivity standard solutions automatically.
Diagram-1

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2 Specifications
2.1 Main specifications
Specifications
pH
Range
(0.00–14.00) pH
Resolution
0.1/0.01 pH
Accuracy
±0.01 pH ±1 digit
Tem peratu re
compensation
(0–100)˚C (manual or automatic)
mV
Range
±1,000 mV
Resolution
1 mV
Accuracy
±0.2% F.S ±1 digit
Conductivity
Range
Conductivity: 0–200 mS/cm (divided into five ranges):
(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.
Resolution
0.01/0.1/1μS/cm 0.01/0.1 mS/cm
Accuracy
±1.0% F.S ±1digit
Tem peratu re
compensation
(0 –100)˚C (manual or automatic)
Electrode constant
0.1 / 1 / 10 cm-1
Temperature
Range
0–100˚C
Resolution
0.1˚C
Accuracy
±0.5˚C ±1 digit
2.2 Other specifications
Power
AAA batteries × 3 (1.5V×3)
IP rating
IP57
Dimension & Weight
Meter: (86×196×33) mm / 335 g
Portable case:(370×270×77)mm/1.8kg

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3 Instrument Description
3.1 LCD Display
：
(1) — Parameter mode icons
(2) — Measurement reading
(3) — Prompts of special display mode
(4) — Units of measurement
(5) — Temp er ature u ni ts (°C an d °F )
(6) — Units of pH and conductivity calibration value
(7) — pH and conductivity calibration value, and prompts of special display mode
(8) — Temp er ature v al ue , and pro mpts o f sp ec ial d is play mode
(9) — Temp er ature c om pensatio n icons
ATC — automatic temperature compensation, MTC — manual temperature compensation
(10) — Calibration guide icon
(11) — Stability icon of readings
(12) — Low battery icon, when this icon appears, please replace the battery
(13) — Automatic reading hold icon
3.2 Keypad functions
Diagram-2
LCD
Diagram-3
Keypad
HOLD
⑬

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3.2.1. Keypad operations
Short press ----- <1.5 seconds; Long press ----- >1.5 seconds.
Turn on the meter: Press to turn on the meter.
Turn off the meter: In the measurement mode, press and hold for 2 seconds to turn off the meter.
Note: In the calibration mode or the parameter setup mode, pressing is invalid. Please press
key to return to the measurement mode first, then press to turn off the meter.
Tab le -1 Keypad operations and descriptions
Keypad
Operations
Descriptions
Short press
● In the power-off mode, press this key to turn on the meter
Long press
● In the measurement mode, press and hold this key for 2 seconds to
turn off the meter.
Short/long press
● Press this key to select measurement mode：
→ → →
● In the measurement mode: long press to enter manual temperature
compensation mode, then long press or momentary press this key
to change the temperature value (only one direction).
● In the parameter setup mode, press this key to change the serial
number of the main menu and the submenu (only one direction)
● In the submenu mode, press this key to change parameters and
setup (only one direction)
Short press
● In the measurement mode, press this key to enter in the calibration
mode
● In the calibration mode or the parameter setup and auto lock-up
(HOLD) mode, press this key to return to the measurement mode
Short press
● In the measurement mode, press this key to enter in the parameter
setup main menu
● In the calibration mode, press this key to make calibration
● In the parameter setup mode, press this key to select programs
3.3 Meter socket
Tab le - 2 Sockets for Meters
Models
Photos
Description
SX823-B pH/Conductivity
meter
●BNC socket (right) — connect pH
electrode or ORP electrode,
●RCA socket (middle) — connect
temperature probe
●Eight-pin socket (left) — connect
conductivity electrode

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3.4 Reading Stability Display Mode
When the measuring value is stable, smiley icon appears on LCD,
see Diagram – 4. If the smiley icon does not appear or flash, please do
not get the reading value or complete calibration until the measuring value is
stable. Per parameter P1.3, there are 3 criteria for stability standard:
(Normal), (High), and (Low). The factory default is set “Normal”.
“High” is set for stability of longer time, “Low” is set for stability of shorter
time. User can select suitable stability criteria according to different testing
requirement.
3.5 Automatic Lock-Up Display Mode
Select On from parameter P4.6 to turn on automatic lock-up display function.
When the reading value stabilizes more than 10 seconds, the meter locks the
measuring value automatically and displays HOLD icon, see Diagram – 5.
In the HOLD mode, press to release lock-up.
3.6 Automatic Power-off
The meter will be power-off if there is no operation for 20 minutes. The time of auto power-off can be set in
parameter setting P3.2
3.7 Temperature Adjustment
When the temperature probe does not connect to the meter, long press key, temperature value flashes,
then long press key or short press key to change the temperature value in one way, and press
key to make confirmation to perform manual temperature compensation.
4 pH Measurement
4.1 Preparation
Things needed in addition to what’s included in the box
A clean cup, distilled water (8-16oz), and tissue papers for rinsing and drying the probe.
4.2 pH Electrode Information
4.2.1 pH Electrode
The meter comes with the 201T-F 3-in-1 combination electrode with a built-in temperature sensor, which
enables the automatic temperature compensation. This electrode is only suitable for regular water solutions’
pH testing. Please refer to Section 10 for ideal pH electrodes to use for other specific applications. The
electrode’s housing adopts polycarbonate materials, which is resistant to shocks and corrosion. A 3M KCL
storage bottle comes with the electrode, which is for storing the electrode when not in use to keep the
Diagram- 4
Diagram - 5

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sensitivity of the probe.
4.2.2 Technical Specifications of the 201T-F pH Electrode
Measurement Range: 0 - 14 pH, 0 - 80˚C (32 – 176˚F)
Junction: Single Ceramic
Reference Electrode: Ag/AgCl
Connector: BNC
Size: ø12*160 mm
Tem peratu re u ni t: 30 K T he rm is to r
4.2.3 Electrode Connectors
The pH electrode has two connectors: the BNC connector connects the pH probe; the RCA connector
connects the temperature sensor. Plug these two connectors into ‘pH/mV” and “TEMP” sockets. Please
note not to pull the cables in case of poor contact. Please keep the connectors clean and dry. Refer to
section 4.7 regarding how to properly maintain the pH electrode.
4.2.4 How to Measure with the Electrode
Screw off the KCL storage bottle, and put it aside (do not dump or spill the KCL solution). Prepare a cup of
distilled water, and rinse the electrode in it for a few seconds. Gently shake the probe to remove excess
water, and dry it with clean tissue paper (DO NOT rub or wipe the probe, just use paper to dap off excess
water). Gently stir the electrode for a few seconds after it’s dipped into the test solution and then let it stand
still. Wait for the stable measurement (a smiley face appears and stays) and then record the readings.
When test is finished, place the electrode in the storage bottle and tighten the cap in order to keep the
sensitivity of the pH sensor.
Notes:
1) This default 201T-F pH electrode will NOT give accurate and stable pH readings when testing purified water such as
distilled or deionized water. This because those water do not have enough ions present for the electrode to function properly.
To measure d i s tilled or deionized water’s pH, users need to use a specialized pH electrode with the meter such as LabSenTM
803 Distilled Water pH Electrod e. Contact us at 1-614-285-3080 or [e-mail] for more details. When testing
purified water like spring water or drinking water, it will take longer for the readings to get stabilized (typically 3-5 minutes)
because there is very few ions left to be detected by the sensor in those purified water.
2) Purified water such as distilled water and deionized water are recommended for only rinsing the probe for the best result.
3) The 201T-F pH Electrode is NOT suitable for testing high-temperature samples (>176˚F). Testing high-temperature
samples could cause permanent damage to the electrode. A specialized electrode such as LabSenTM 213 (up to 225˚F) should
be used in this situation.
4) The electrode housing is polycarbonate. When using cleaning solutions, take cautions on carbon tetrachloride,
trichlorethylene, tetrahydrofuran, acetone, etc., which will dissolve the housing and invalidate the electrode.

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4.3 Calibration Information
Table - 3 pH standard buffer solution series
Icons
pH standard buffer solution series
USA series
NIST series
Three-point calibration
4.00 pH
4.01 pH
7.00 pH
6.86 pH
10.01 pH
9.18 pH
4.3.1 Three-point calibration
The instrument can perform 1-3 points calibration. The first point calibration must use 7.00 pH (or 6.86 pH)
standard solution, then select other standard solution to perform the second and the third point calibration.
See Tab le - 4.
Table - 4 Three-point calibration mode
USA standard
NIST standard
Icons
Suited range
One-point calibration
7.00 pH
6.86 pH
Accuracy
≥ ±0.1pH
Two-point calibration
7.00 pH → 4.00 pH
6.86 pH → 4.01 pH
Range< 7.00pH
7.00 pH → 10.01 pH
6.86 pH → 9.18 pH
Range> 7.00pH
Three-point calibration
7.00→4.00→10.01 pH
6.86→4.01→ 9.18 pH
Large Range
4.3.2 Calibration intervals
The frequency that you need to calibrate your meter depends on the tested samples, performance of
electrodes, and the requirement of the accuracy. For High-Accuracy measurements (≤ ±0.03pH), 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:
a) The electrode hasn’t been used for a long time or the electrode is brand new.
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 big difference between the temperature of the test sample and the temperature of the buffer
solution that is used in the last calibration.

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4.4 pH Meter Calibration (with an example of three-point calibration)
4.4.1. First point calibration
(a) Press key to enter into the calibration mode, “CAL 1”
blinks at the top right of LCD and “7.00 pH” blinks at the bottom right of
LCD, indicating using pH 7.00 buffer solution to make the 1st point calibration.
(b) Rinse pH electrode in distilled water, dry it, and submerge it in
pH7.00 buffer solution. Stir the solution briefly and allow it to stay in the
buffer solution until a stable reading is reached. Press key to finish
calibration when appears and stays. The meter enters in measurement
mode. Calibrationguide icon displays at the bottom left of LCD, indicating
the medium point of calibration is completed. See Diagram-6.
4.4.2. Second point calibration
Press key to enter into the calibration mode, “CAL 2”
blinks at the top right of LCD indicating to make the 2nd point calibration.
Rinse pH electrode in distilled water, dry it, and submerge it in
pH4.00 buffer solution. Stir the solution briefly and allow it to stay in the
buffer solution until a stable reading is reached. The meter’s display will
show scanning and locking process of calibration buffer solution at the
bottom right of LCD. When the meter locks at 4.00 pH, press key
to finish calibration when appears and stays. LCD will display electrode
slope of acidity range, then 2nd point calibration is finished, the meter enters in measurement mode.
Calibration guide icons display at the bottom left of LCD.
4.4.3. Third point calibration
Press key to enter into the calibration mode, “CAL 3” blinks at the top right of LCD indicating to make
the 3rd point calibration. Rinse pH electrode in distilled water, dry it, and submerge it in pH10.01 buffer
solution. Stir the solution briefly and allow it to stay in the buffer solution until a stable reading is reached.
The meter’s display will show scanning and locking process of calibration buffer solution at the bottom right
of LCD. When the meter locks 10.01pH, press key to finish the calibration when appears and
stays. LCD will display electrode slope of alkalinity range, then 3rd point calibration is finished, the meter
enters in measurement mode of three-point calibration. Calibration guide icons
display at the bottom left of LCD.
Notes:
(a) The meter can perform 1-3 points calibration. When the 1st point calibration is done, the meter will enter
into measurement mode of one-point calibration. Two-point and three-point calibration are in the same
manner.
(b) During the calibration process, if measuring value is not stable yet (when does not appear and the
key is pressed, then Er 2 displays. See Ta bl e – 5.
(c) To exit from the calibration mode, press key.
Diagram- 6

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4.5 Sample Test
4.5.1. Rinse pH electrode in distilled water, dry it, and submerge it in test solution. Stir the solution briefly
and allow it to stay in the tested solution until icon appears and stays on LCD. Then get the readings
of the measurement.
Diagram – 7 is the calibration and measurement process of pH meter
Diagram – 7 Calibration and measurement process of pH meter
4.5.2. Self-diagnosis information
During the process of calibration and measurement, the meter has self-diagnosis functions, indicating the
relative information as below, please refer to Tab le – 5.
Tab le – 5 Self-diagnosis information of pH measurement mode
Display
Icons
Contents
Check and Fix
Wrong pH buffer solution or the
recognition of calibration solution out of
range.
1. Check whether pH buffer solution is correct.
2. Check whether the meter connects the
electrode well.
3. Check whether the electrode is damaged.
Press key when measuring value is
not stable during calibration.
Press key after icon appears.
During calibration, the measuring value
is not stable for ≥3min.
1. Check whether there are bubbles in glass bulb.
2. Replace with new pH electrode.
pH electrode performance error
zero potential <-60mV or >60mV,
slope <75%
1. Check whether there are bubbles in glass bulb.
2. Check whether pH buffer solution is correct.
3. Replace with new pH electrode.
* If you find any air bubble in the glass bulb of the pH sensor, simply shake the probe for a few times to
remove it. The existence of an air bubble in the glass bulb will significantly decrease the stableness of
measurement.
Press to turn
on the meter
Press key to
enter into the
calibration mode.
Submerge the electrode
in pH7.00 solution, press
key when
icon appears and stays
One-point calibration
is done, the meter
enter in measurement
mode
Two-point calibration
is done, the meter
enter in measurement
mode
。
Submerge the electrode
in pH4.00 solution, press
key when
icon appears and stays.
Submerge the electrode
in pH10.01solution,press
key when
icon appears and stays.
Three-point
calibration is done,
the meter enter in
measurement mode
Sample
Te s t
1 st point calibration
3rd point calibration
Press key to
enter into the
calibration mode.
Press key to
enter into the
calibration mode.
2nd point
calibration

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4.5.3 pH Isothermal Measurement Principle
According to the pH isothermal measurement principle, the closer the test sample’s temperature is to the
calibration solution’s, the higher the accuracy of the measurement. This principle is recommended to follow
when conducting tests for the best result. Example: If users were to test samples at 150˚F, we recommend
warming up the calibration solutions to the same temperature before performing calibrations in order to get
the most accurate readings.
4.5.4. Factory default setting
For factory default setting, please refer to parameter setting P1.4. All calibration data is deleted and the
meter restores to the theory value (zero electric potential of pH is 7.00, the slope is 100%). Some functions
restore to the original value (refer to appendix -1). When calibration or measurement fails, please restore
the meter to factory default setting and then perform re-calibration or measurement. Please note once it is
set as factory default, all the data deleted will be irretrievable.
4.5. pH Electrode Maintenance
4.5.1 Daily maintenance
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
(SKU:AI1107). Note: using other brands’ storage solutions could cause permanent damage to the
pH electrode because different chemicals are used. The electrode should not be soaked in distilled
water, protein solution or acid fluoride solution for long periods of time. In addition, do not soak the
electrode in organic lipids.
4.5.2 Calibration buffer solution
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.
4.5.3 Protect the glass bulb sensor
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 washed 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 and then
rinsed with distilled water. After that, soak it in the KCL solution again for 6 hours.
4.5.4 Renew glass bulb
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 wash the electrode in distilled water, then submerge it in KCL
soaking solution for 24 hours. The method to prepare 0.1mol/L hydrochloric acid: dilute 9mL hydrochloric

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acid in distilled water to 1000mL. For serious passivation, submerge the bulb in 4% HF (hydrofluoric acid)
for 3-5 seconds, and wash it in distilled water, then submerge it in the soaking solution for 24 hours to
renew it.
4.5.5 Clean contaminated glass bulb and junction (please refer to Table-7)
Tab le -7 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
5 mV Value Measurement:
Press key, and switch the meter to mV measurement mode. Connect ORP electrode (sold separately,
SKU: AI1303) and dip it in sample solution, stir the solution briefly and allow it to stay in the solution until
icon appears and stays, and get the readings of measurement, which is the *ORP value.
*ORP stands for Oxidation Reduction Potential. The unit is mV.
5.1 . Notes
5.1.1. ORP measurement does not require calibration. When the user is not sure about ORP electrode
quality or measuring value, use ORP standard solution to test mV value and see whether ORP electrode
or meter works properly.
5.1.2. Clean and Activate ORP Electrode
After the electrode has been used over long period of time, the platinum surface will get polluted, which
causes inaccurate measurement and slow response. Please refer to the following methods to clean and
activate ORP electrode:
(a) For inorganic pollutant, submerge the electrode in 0.1mol/L dilute hydrochloric acid for 30 minutes, then
wash it in distilled water, then submerge it in the soaking solution for 6 hours.
(b) For organic or lipid pollutant, clean the platinum surface with detergent, then wash it in distilled water,
then submerge it in the soaking solution for 6 hours.
(c) For heavily polluted platinum surface on which there is oxidation film, polish the platinum surface with
toothpaste, then wash it in distilled water, then submerge it in the soaking solution for 6 hours

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6 Conductivity Measurement:
6.1 Conductivity Electrode Information
6.1.1 Conductivity electrode
Model 2301T-S plastic conductivity electrode with constant K=1.0 and built-in temperature sensor, can
realize automatic temperature compensation. The electrode housing is POM plastic which is corrosion
resistant and impact resistant. When submerge the conductivity electrode in solution, stir the solution briefly
to eliminate the air bubbles and improve response time and stability.
6.1.2 Conductivity electrode constant
The meter matches conductivity electrodes of three constants: K=0.1, K=1.0 and K=10.0. Please refer to
Tab le - 6 for measuring range. Set constant in parameter setting P2.1 and refer to section 7.4
Tab le – 6 Electrode constant and measuring range
Range
＜20 μS/cm
0.5 μS/cm–100 mS/cm
＞100mS/cm
Conductivity
electrode
constant
K=0.1 cm-1
K=1.0 cm-1
K=10 cm-1
Standard solution
84μS/cm
84 μS/cm
1413 μS/cm
12.88 mS/cm
111.9 mS/cm
6.2 Conductivity Calibration
6.2.1 Conductivity calibration solutions
The meter uses conductivity standard solution of 84 μS/cm, 1413 μS/cm, 12.88 mS/cm and 111.9 mS/cm.
The meter can recognize the standard solution automatically and perform one-point or multi-point
calibration (the maximum is four-point calibration). The calibration indication icons correspond to the four
standard values ( icon corresponds to two standards). See Ta bl e – 7:
Tab le – 7 Conductivity standard solution series
Calibration guide icons
Calibration solution series
Range
84 μS/cm
0-200 μS/cm
1413 μS/cm
200-2,000 μS/cm
12.88 mS/cm
2-20 mS/cm
111.9 mS/cm
20-200 mS/cm

15
6.2.2 Calibration Frequency
(a) The meter is calibrated before leaving the factory and can generally be used right out of the box.
(b) Normally perform calibration per month.
(c) For high accuracy measurements or large temperature deviation from the reference temperature (25°C),
perform calibration per week.
(d) Use conductivity standard solution to check whether there is error. Perform calibration if error is large.
(e) For new electrode or factory default setting, perform 3-point or 4-point calibration. Choose closer
standard solution to the sample solution to perform 1-point or 2-point calibration.
6.2.3 Reference temperature
Reference temperature of factory default is 25°C. Other reference temperature can also be set for range
15°C – 30°C. Select per parameter setting P2.2 and see Section 7.4.
6.2.4 Temperature coefficient
The temperature compensation coefficient of the meter setting is 2.0%/°C. However, the conductivity
temperature coefficient is different from solutions and concentration. Please refer to Table – 8 and the data
collected during testing. Set per parameter setting P2.3. and see Section 7.4.
Note: When the coefficient for the temperature compensation is set to 0.00 (no compensation), the
measurment value will be based on the current temperature.
Tab le – 8 Tem pe ra tu re com pe ns ation c oe ffi cient o f sp ec ial s ol ut ions
Solution
Tem peratu re c om pe ns at io n coeffi ci en t
NaCl solution
2.12%/°C
5% NaOH solution
1.72%/°C
Dilute ammonia solution
1.88%/°C
10% hydrochloric acid solution
1.32%/°C
5% sulfuric acid solution
0.96%/°C
6.2.5 Avoid contamination of standard solutions
Conductivity standard solution has no buffer. Please avoid being contaminated during usage. Before
submerging the electrode in standard solution, please wash the electrode and allow it to dry. Please do not
use the same cup of conductivity standard solution repeatedly, especially for standard solution of low
concentration (84μS/cm). The contaminated standard solution will affect accuracy.

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6.3 Conductivity Calibration (take 1413μS/cm as an example)
6.3.1. Rinse the electrode in distilled water, dry it, rinse it with a little standard solution and submerge it in
the same standard solution. Stir the solution briefly and allow it to stay in the solution until a stable reading
is reached.
6.3.2. Press key to enter into the calibration mode.
The meter’s display will show blinking “CAL” at the top right, and scanning
and locking process of calibration solution at the bottom right. When the meter
locks 1413 mS, stable icon will display on LCD. Press key to complete
calibration. The meter will return to measuring mode and is displayed on
bottom left of the LCD screen. See diagram-8.
6.3.3. For multi-point calibration, please repeat Section 6.3.1-6.3.2 until all
the calibration is done. The meter can repeat calibration in the same
calibration solution until the stable value is reached.
6.3.4. Notes:
(a) If press key before stable icon appeared on LCD screen,
Error indication icon Er 2 will be shown. See Table -11.
(b) Press key to exit calibration mode.
6.4 Relations between TDS and Conductivity
6.4.1. TDS and conductivity is linear related. The conversion factor is 0.40-1.00. Adjust the factor from
parameter P2.4. The factory default setting is 0.71 and please refer to Section 7.4. The meter only needs
to be calibrated in Conductivity mode, then after calibration of conductivity, the meter can switch from
conductivity to TDS or salinity.
6.4.2 Adjust TDS conversion factor in parameter setting P2.4 according to the data collected during testing
and experience. Ta bl e – 9 lists some common use Conductivity and TDS conversion factors. This is for
your reference only.
Tab le – 9 Conductivity and TDS conversion factors
Conductivity of solution
TDS conversion factor
0-100 μS/cm
0.60
100-1,000 μS/cm
0.71
1-10 mS/cm
0.81
10-100 mS/cm
0.94
Diagram- 8

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6.5 Sample test
6.5.1. Rinse conductivity electrode in distilled water, allow it to dry, and submerge it in the sample solution.
Stir the solution briefly and allow it to stay in the sample solution until a stable reading is reached and
icon appears on LCD, then get the reading value, which is the conductivity value of the solution.
6.5.2. Press key to switch to TDS.
6.5.3. During the process of calibration and measurement, the meter has self-diagnosis functions,
indicating the relative information as below: Tab le – 11.
Tab le – 11 Self-diagnosis information of conductivity measurement mode
Display Icons
Contents
Checking
Wrong conductivity calibration solution
or the meter recognition of calibration
solution out of range.
1. Check whether conductivity calibration
solution is correct.
2. Check whether the meter connects the
electrode well.
3. Check whether the electrode is damaged.
Press key when measuring value is
not stable during calibration.
Press key after icon appears and
stays.
During calibration, the measuring value is
not stable for ≥ 3 min.
1. Shake the electrode to eliminate bubbles in
electrode head.
2. Replace with new pH electrode.
6.5.4 Factory default setting
For factory default setting, please refer to parameter setting P2.5 (Section 7.4). With this function, all
calibration data is deleted and the meter restores to the theory value. Some functions restore to the original
value (refer to appendix -1). When calibration or measurement fails, please restore the meter to factory
default setting and then perform re-calibration or measurement. Please note once set the factory default,
all the data deleted will be irretrievable.
6.6. Conductivity electrode maintenance
6.6.1. Always keep the conductivity electrode clean. Before taking a measurement, rinse the electrode in
distilled water. It is recommended to rinse it again in the sample solution. When submerge the electrode in
solution, stir the solution briefly to eliminate air bubbles and allow it to stay until a stable reading is reached.
For conductivity electrode which is drily stored, soak the electrode in distilled water for 5-10 minutes. Rinse
the electrode in distilled water after measurement.
6.6.2. The interaction rod of Model 2301T-S conductivity electrode is coated with platinum black to minimize
electrode polarization and expand measuring range. The platinum black coating adopted our special
processing technology which improves the electrode performance and the firmness of the coating. If the
platinum black electrode is stained, gently clean the electrode with soft brush in warm water containing
detergent or alcohol.

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7 Parameter setting
7.1 Main menu
In the measurement mode, press key to enter in P1.0, then press to switch to main menu:
P1.0→P2.0→P3.0. Please refer to diagram – 9.
P1.0: pH parameter setting menu,
P2.0: Conductivity parameter setting menu,
P3.0: Basic parameter setting menu.
7.2 Submenu
7.2.1. In P1.0 mode, press key to enter in submenu P1.1 of pH parameter setting, then press key to switch among submenu:
P1.1→P1.2→P1.3→P1.4, see Diagram – 9.
7.2.2. In P2.0 mode, press key to enter in submenu P2.1 of conductivity parameter setting, then press key to switch among
submenu: P2.1→P2.2→P2.3→P2.4→P2.5, see Diagram– 9.
7.2.3. In P3.0 mode, press key to enter in submenu P3.1 of basic parameter setting, then press key to switch among submenu:
P3.1→P3.2→P3.3, see Diagram – 9.
P1.1 Select pH standard solution
P1.2 Select resolution
P1.3 Set stability criteria
P1.4 Restore to factory setting
P2.1 Select electrode constant
P2.2 Select reference temp
P2.3 Adjust temperature
compensation factor
P2.4 Adjust TDS factor
P2.5 Restore to factory setup
P3.1 Select temperature unit
P3.2 Automatic power-off setup
P3.2 Automatic lock-up setup
Submenu of pH parameter setting
Submenu of Cond. parameter setting
Submenu of basic parameter setting
Main menu of parameter setting

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7.3 Submenu of pH parameter setting (press key to switch)
P1.1. – Select pH standard solution (USA-NIST)
1. In measurement mode, press key to enter in P1.0 mode, then press
to enter in P1.1.
2. When press key, USA blinks, press key to select USA→nIS,
press to confirm. USA-USA series; nIS-NIST series.
3. After confirm parameter, press key to enter in P1.2 mode, or press
key to return to the measurement mode.
P1.2. – Select resolution (0.01 – 0.1)
1. Press key, 0.01 blinks, press key to select 0.01→0.1, press
key to confirm.
2. After confirm parameter, press key to enter in P1.3 mode, or
press key to return to the measurement mode.
P1.3. – Set reading stability criteria (Normal – High – Low)
1. Press key, nor blinks. Press key to select nor→HI→Lo, press
to confirm.
Nor – Normal, Hi – High, Lo – Low.
2. After confirm parameter, press key to enter in P1.4 mode, or
press key to return to the measurement mode.
P1.4. –Restore factory setting (No – Yes)
1. Press key, no blinks. Press key to select no→YES, press
to confirm, the meter returns to the measurement mode.
No – Do not restore, Yes – Restore to factory setting.
2. If don’t select Yes, press key to return to the measurement mode.
7.4 Submenu of conductivity parameter setting (press key to switch)
P2.1. – Select electrode constant (1.0-10.0-0.1)
1. In P2.0 mode, press key to enter in P2.1 mode, please refer to the
left Diagram.
2. Press key, 1.0 blinks, then press key to select 1.0→10.0→0.1,
press key to confirm.
3. After confirm the parameter, press key to enter in P2.2 mode, or
press key to return to the measurement mode.
P2.2. – Select reference temperature (15.0°C-30.0°C)
1. Press key, 25.0°C blinks, then press key to adjust
temperature value 15.0-30.0, press key to confirm.
2. After confirm parameter, press key to enter in P2.3 mode, or press
key to return to the measurement mode.

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P2.3. – Adjust temperature compensation coefficient (0.00-9.99%)
1. Press key, 2.00 blinks, press key to adjust temperature
compensation coefficient 0.00 – 9.99, press key to confirm.
2. After confirm the parameter, press key to enter in mode P2.4 or
press key to return to the measurement mode.
P2.4. – Adjust TDS factor
1. Press key, 0.71 blinks, press key to adjust TDS factor 0.04 –
1.00, press key to confirm.
2. After confirm the parameter, press key to enter in mode P2.5 or
press key to return to the measurement mode.
P2.5. –Restore factory setting (No – Yes)
1. Press key, no blinks. Press key to select no→YES, press
to confirm, the meter returns to the measurement mode.
No – Do not restore, Yes – Restore to factory setting.
2. If don’t select Yes, press key to return to the measurement mode.
7.5 Submenu of basic parameter setting (press key to switch)
P3.1. Select temperature unit (°C—°F).
1. In P3.0 mode, press key to enter in P3.1 mode, please refer to
the left Diagram.
2. Press key, °C blinks, then press key to select °C→°F, press
key to confirm.
3. When parameter is confirmed, press key to enter in mode P3.2
or press key to return to the measurement mode.
P3.2 – Automatic power-off setup (10→20→30→On)
1. Press key, On blinks, press key to select 10→20→30→On
press key to confirm. Select On to turn on the function, the unit is
minute.
2. After confirm the parameter, press key to enter in mode P3.3 or
press key to return to the measurement mode.
P3.2 – Automatic lock-up setup (Off→On)
1. Press key, OFF blinks, press key to select OFF→On, press
to confirm.
Off – not set; On–set (the reading is automatically locked when
stabilizes＞10 seconds.)
2. When Parameter is confirmed, press key to return to the
measurement mode.