Environmental Express ION 100 User manual

ION 100 Portable Ion Meter
Instruction Manual
35613-65, -68
Environmental Express
www.environmentalexpress.com

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Table of Contents
1Brief Introduction ............................................................................................................- 2 -
2Technical Specifications....................................................................................................- 3 -
3Instrument Description....................................................................................................- 4 -
3.1 LCD .........................................................................................................................- 4 -
3.2 Keypad functions.......................................................................................................- 4 -
3.3 Meter socket.............................................................................................................- 5 -
3.4 Display mode ............................................................................................................- 6 -
3.5 Other functions.........................................................................................................- 6 -
4pH Measurement.............................................................................................................- 7 -
4.1 pH electrode information ..........................................................................................- 7 -
4.2 Calibration solution and calibration mode .................................................................- 7 -
4.3 pH measurement ......................................................................................................- 8 -
4.4 Sample test...............................................................................................................- 9 -
4.5 Information regarding pH calibration and measurement ............................................- 9 -
4.6 Customized calibration (take 1.60pH & 6.50pH as example) .....................................- 10 -
4.7 Notes regarding customized calibration ...................................................................- 10 -
4.8 Self-diagnosis information.......................................................................................- 10 -
4.9 Maintenance of the pH Electrode ............................................................................- 11 -
5mV (ORP) Measurement ................................................................................................- 13 -
5.1 mV measurement....................................................................................................- 13 -
5.2 ORP measurement ..................................................................................................- 13 -
5.3 Notes on ORP measurement....................................................................................- 13 -
6 Ion Concentration Measurement..................................................................................- 14 -
6.1 Preparation work ....................................................................................................- 14 -
6.2 Ion calibration (Take F- electrode as an example, unit of mol/L, 3 point calibration)..- 15 -
6.3 Notes on ion calibration ..........................................................................................- 16 -
6.4 Ion measurement....................................................................................................- 17 -

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6.5 Self-diagnosis information.......................................................................................- 17 -
7Parameter Settings ........................................................................................................- 18 -
7.1 Main menu of parameter setting .............................................................................- 18 -
7.2 Sub-menu of pH parameter setting..........................................................................- 19 -
7.3 Sub-menu of ion parameter setting .........................................................................- 20 -
7.4 Sub-menu of basic parameter setting ......................................................................- 21 -
8What’s in the Kit? ..........................................................................................................- 22 -
9Warranty .......................................................................................................................- 22 -
1BRIEF INTRODUCTION
Thank you for purchasing Environmental Express Ion 100 Portable Ion Meter.
This meter is a perfect combination of the most advanced electronics technology, sensor
technology, and software design, and is the most cost-effective portable electrochemical meter. In
order to use and maintain the instrument properly, please read the manual thoroughly before use.
(To improve instrument performance constantly, we reserve the right to change the manual and
accessories without giving notice in advance.)
Main features and functions
⚫The microprocessor-based portable meter features automatic calibration, automatic
temperature compensation, function setup, self-diagnostics, automatic power-off and low
voltage display. The meter’s digital filter improves measurement speed and accuracy. There is
a stable reading indication on the display.
⚫The instrument can measure pH, mV, ion concentration and the temperature.
⚫Ion units switchable among pX, mol/L, mg/L (ppm).
⚫The meter is dust resistant and waterproof, meeting the IP57 rating.

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2TECHNICAL SPECIFICATIONS
Technical Specification
pH
Range
0.00 ~ 14.00pH
Resolution
0.01/0.1 pH
Accuracy
±0.01 pH
Temperature
compensation
(0 to 100)˚C (manual or automatic)
Calibration
1~3 points automatic
Buffer series
1.68, 4.00, 7.00, 10.01 and 12.45 pH (USA)
1.68, 4.01, 6.86, 9.18 and 12.45 pH (NIST)
mV
Range
±1000mV
Resolution
-200 ~ 200mV: ±0.1mV; Other range: ±1mV
Accuracy
±0.2% F.S.
Ion
Range
pX: 0.00~10.00
Ion concentration: 0~1999
Switchable unit: pX, mol/L, ppm (mg/L)
Resolution
3~4 significant digits
Accuracy
±1.0% F.S.
Temperature
Range
0~100℃
Resolution
0.1℃
Accuracy
±0.5℃±1 digit
Other
Power
AA batteries x 3 (1.5V×3)
IP Rating
IP57 Waterproof
Size and Weight
Meter: 91×190×33mm, (3.58”x7.48”x1.29”) /354 gm
Carrying case: 330×270×82mm, (12.99”x10.63”x3.22”)
/1.28 kg

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3 INSTRUMENT DESCRIPTION
3.1 LCD display
①
Parameter mode icons
⑦
Temperature value and indicator icons
②
Measurement reading
⑧
ATC—automatic temperature compensation.
MTC—manual temperature compensation
③
Ion symbol
⑨
Calibration guide icon
④
Units of measurement
⑩
Automatic reading hold icon
⑤
Temperature units
⑪
Stability icon of readings
⑥
Indicator icons
⑫
Low battery icon
3.2 Keypad functions
Short press ----- < 2 seconds.
Long press ----- > 2 seconds
Diagram - 1
Diagram - 2

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.Table -1 Keypad operations and descriptions
Keypad
Operations
Descriptions
Short press
⚫Press this key to turn on/off the meter
Short press
Long press
⚫Short press to select measuring parameter or unit：
→ → → pX → mol/L → ppm (mg/L)
⚫Long press to enter the main parameter setup menu.
Short press
Long press
⚫In the measurement mode, long press to enter calibration mode.
⚫Short press to cancel operation, get back to measurement mode or
the previous operation.
⚫When the measure value is locked-up, short press release lock-up.
Short press
⚫In measurement mode: press to turn on/off the backlight.
⚫In calibration mode: press to calibrate.
⚫In the parameter setup mode: press to enter and open the sub-
menu, confirm parameter.
⚫When measurement value is locked-up, press to release lock-up.
Short press
Long press
⚫Under MTC (see Section 3.5.1), short press to change temperature,
long press for quick changing of the value.
⚫In parameter setup mode: press to select parameter.
3.3 Meter socket
The meter sockets are protected by silicon caps, waterproof and dust resistant. Open the silicon caps
before connecting with the electrodes: BNC connector (left) connects with the pH electrode and the
ion electrode, Φ2.5 connector (middle) connects with the temperature probe.

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3.4 Display mode
3.4.1 Stable Reading Mode
When the measurement value is almost 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 conduct
calibration until the measuring value is stable.
3.4.2 Automatic Lock-up Display Mode
Select on from parameter P6.2 to turn on automatic lock-up
display function. When the reading value stabilizes more than 10
seconds, the meter locks the reading value automatically and
Displays HOLD icon, see Diagram - 5. In HOLD mode, press
to release lock-up.
3.5 Other functions
3.5.1 Manual Temperature Compensation
When temperature probe is not connected, press or to change the temperature value,
long press for quick changing of the temperature value.
3.5.2 Automatic Power-off
The meter is with automatic power-off function. Select from parameter P6.4 to select automatic
power-off time: 10-20-30-off, i.e. user can select automatic power-off time to be 10 minutes, 20
minutes or 30 minutes (starting from the last operation). When Off is selected, the meter will not
turn off automatically.
3.5.3 Back-light
The meter is with white backlight, suitable for application even in dark environments. However,
when backlight is on, the consumption of the power will increase. Press to turn on/off the
backlight in measurement mode. Select from P6.3 to select lasting time for backlight: 1-2-3-Off, i.e.
select backlight lasting time to be 1 minute, 2 minutes or 3 minutes. When Off is selected, the
backlight will be turned on all the time.
Diagram- 4
Diagram- 5

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3.5.4 Battery
The meter adopts 3x AA batteries. Please use LR6 alkaline battery to ensure the battery quality.
Battery life > 200 hours (without backlight). When LCD displays icon, please replace with new
batteries, see Diagram - 6.
4PH MEASUREMENT
4.1 pH electrode information
4.1.1 The meter connects to plastic combination pH electrode, with BNC connector. Configured
with temperature probe (built in 30kΩthermistor), Phono plug. The meter can use other
pH combination electrodes with the BNC connector.
4.1.2 When both the pH electrode and the temperature probe are connected to the meter, it
directly goes to automatic temperature compensation mode. When the meter is connected
to the pH electrode only, it will enter manual temperature compensation mode. Press
or to input the temperature into the meter.
4.1.3 Gently stir the pH electrode for a few seconds after it’s dipped into the test solution to
eliminate air bubbles for the stable measurement in a short period of time.
4.2 Calibration solution and calibration mode
4.2.1 Calibration solution
The meter can calibrate up to 5 pH values using USA or NIST buffer series, corresponding to
calibration indicator icons, see Table - 2.
Table - 2 pH buffer solution series
Calibration icon
pH buffer solution series
USA
NIST
3 points
calibration
1.68 or 4.00 pH
1.68 or 4.01 pH
7.00 pH
6.86 pH
10.01 or 12.45 pH
9.18 or 12.45 pH
Diagram- 6

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4.2.2 Calibration mode
The meter can adopt 1 to 3 points of calibration. The 1st point must be using 7.00 pH (or 6.86 pH)
buffer solution, and then choose other buffers to do 2nd point and 3rd point. Please refer to Table-3
for details.
Table - 3 Calibration mode
USA
NIST
Calibration
icon
When to adopt
1-Point
Calibration
7.00 pH
6.86 pH
Accuracy: ±0.1pH
2-Point
Calibration
7.00 pH→4.00 or 1.68pH
6.86 pH→4.01 or 1.68pH
Measuring range: 0
to 7.00 pH
7.00 pH→10.01 or 12.45pH
6.86 pH→9.18 or 12.45pH
Measuring
range: >7.00 pH
3-Point
Calibration
7.00pH→4.00 or
1.68pH→10.01 or 12.45pH
6.86pH→4.01 or 1.68pH→
9.18 or 12.45pH
Wide measuring
range
4.3 pH Measurement
4.3.1 The 1st point calibration
Rinse the pH electrode and the temperature probe in distilled or deionized water and allow it to dry,
long press to the enter calibration mode. CAL1 icon will flash in the bottom right corner of the
LCD, reminding you to use pH7.00 buffer to conduct the 1st point of calibration. Dip the pH electrode
and the temperature probe into pH7.00 buffer solution, stir gently and let it stand still and wait for
the reading to be stable. When the stable icon displays on LCD, press to finish 1st point
calibration, meter goes to measurement mode, the bottom left of LCD indicating .
4.3.2 The 2nd point calibration
Rinse the electrodes in distilled or deionized water, allow it to dry. Long press to enter
calibration mode. CAL2 icon flashes at the bottom right corner of the LCD, reminding you to make
the 2nd point of calibration. Submerge the electrodes into pH4.00 buffer solution, stir the solution
gently 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 4.00pH, stable icon displays and stays on LCD. Press to calibrate
the meter. Electrode slope displays after calibration is done, the 2nd point calibration finished, the
meter goes to measurement mode, and the bottom left of LCD indicates .

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4.3.3 The 3rd point calibration
Repeat the steps as per Section 4.3.2, use pH10.01 buffer solution, and complete the 3rd point
calibration. The bottom left of LCD indicates .
4.4 Sample test
Rinse pH electrode in distilled or deionized water, allow it to dry, and submerge it in the sample
solution. Stir the solution briefly and allow it to stay in the sample until the value becomes stable
and icon appears on LCD, get the reading which is the pH value of the sample solution.
4.5 Information regarding pH calibration and measurement
4.5.1 During the process of calibration and measurement, submerge both the pH electrode and
the temperature probe into the solution to ensure automatic temperature compensation.
4.5.2 In calibration mode, press to exit.
4.5.3 The meter can conduct 1~3 points of calibration according to measurement requirements.
Refer to Table - 3 to check when to adopt.
4.5.4 During the process of calibration and measurement, the meter has self-diagnosis functions,
indicating information Er1~Er4, please refer to Table - 4 for relevant solutions.
4.5.5 The calibration frequency depends on the sample, electrode performance and accuracy
requirement. For high accuracy measurements (≤±0.03pH), the meter should be calibrated before
testing every day. For ordinary accuracy measurements (≤±0.1pH), once calibrated, the meter can
be used for about a week or even 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.
4.5.6 pH temperature principle
Please note that the closer the temperature of the sample is to the calibration solution, the more
accurate will be the readings.

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4.5.7 Factory default setting
The meter has a function to return to factory default setting, which can be set up in P1.3. All
calibration data will be deleted, and the meter will restore to the theory value (zero electrical
potential of pH is 7.00, the slope is 100%). Some functions restore to the default 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.
4.6 Customized calibration (take 1.60pH & 6.50pH as example)
4.6.1 Choose CUS (customized calibration) in parameter setting P1.1, the meter enters customize
calibration mode.
4.6.2 Rinse the electrode with distilled or deionized water, allow it to dry. Long press to enter
calibration mode, dip it into 1.60pH calibration solution, stir gently and let it stand still and
wait for the reading to become stable. When the smiley icon displays on LCD, press
to adjust the value to 1.60, then press to confirm the calibration. The meter goes
back to measurement mode, and the 1st point calibration is completed.
4.6.3 Dip the electrode into 6.50pH buffer solution, follow the steps as per Section 4.6.2 to finish
the 2nd point of calibration. The meter can conduct 1 or 2 points of customized calibration.
4.7 Notes regarding customized calibration
4.7.1 Calibration indicator will NOT appear at the bottom left of the LCD for a customized
calibration.
4.7.2 The pH of “customized calibration”is the measurement under certain temperature. The
meter must calibrate and measure in the same temperature, otherwise it will be inaccurate.
The meter does not recognize customize calibration solutions.
4.8 Self-diagnosis information
Among the calibration and measurement procedure, the meter has self-diagnosis function,
indicating relevant information, see Table - 4.

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Table - 4 Self-diagnosis information in pH measurement mode
Display
Icon
Contents
Checking
Press before measuring
value becomes stable.
Press when icon appears and stays.
Wrong pH buffer solution or the
buffer solution out of range.
1. Check whether pH buffer solution is correct.
2. Check whether the meter connects the
electrode properly.
3. Check whether the electrode is damaged.
During calibration, the measuring
value being unstable (≥3min).
1. Check whether there are air bubbles in glass
bulb.
2. Replace with a new pH electrode.
pH electrode zero electric potential
out of range (<-60mV or >60mV)
Electrode slope<75%
1. Check whether there are air bubbles in glass
bulb.
2. Check whether pH buffer solution is correct.
3. Replace with a new pH electrode.
4.9 Maintenance of the pH Electrode
4.9.1 Daily maintenance
The soaking solution contained in the supplied protective bottle is used to maintain hydration of the
glass bulb and liquid junction. Loose the cap, take out the electrode and rinse in distilled or deionized
water before taking a measurement. Insert the electrode and tighten the cap after measurements
to prevent the solution from leaking. If the storage solution is cloudy or moldy, rinse the bottle and
replace the soaking solution (The method to prepare dissolve 26 gm KCl into 100ml distilled water).
Make sure the meter is dry and clean all the time, especially the sockets and connectors, or else it
may lead to measurement inaccuracy or invalid readings.
Once contaminated, use cotton and water free alcohol to wipe clean and allow it to dry.
*The electrode should NOT be soaked and stored in purified or distilled water, protein solution, acid
fluoride solution or organic lipids. Storing in distilled or deionized water will cause the electrolyte to
be diluted and will result in unstable readings.

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4.9.2 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.
4.9.3 Protect glass bulb
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 or deionized water. Do not wipe
the glass bulb with tissue paper as it may lead to unstable electric potential of the electrode and the
slow response. If a sample sticks to the electrode or it's contaminated, the electrode should be
thoroughly cleaned with soap water and then rinsed with distilled water.
4.9.4 Renew glass bulb
Electrodes that have been used for a long period of time will become aged. Submerge the electrode
in 0.1 mol/L hydrochloric acid for 24 hours, then rinse the electrode in distilled water, then
submerge it in the soaking solution for 24 hours. For serious passivation, submerge the bulb in the
pH soaking solution (sold separately) to renew it.
4.9.5 Clean contaminated glass bulb and junction (see Table - 5)
Table - 5 Clean contaminated pH 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 and ether
Protein hematocyte sediment
Acidic enzymatic solution (saccharated
yeast tablets)
Paints
Dilute bleacher, peroxide
The electrode housing is polycarbonate. Please avoid using detergents including perchloromethane,
trichloroethylene, diethylene oxide and acetone, as these solutions will dissolve the shaft material
and lead to passivation or failure of the pH electrode.

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5MV (ORP) MEASUREMENT
5.1 mV measurement
Short press , switch the meter to mV mode, connect the ion combination electrode and the
temperature probe or the pH electrode and the temperature probe, submerge into the solution, stir
gently and let it stand still, wait for the reading to be stable and displays , and then get the
reading.
5.2 ORP measurement
Short press , switch the meter to mV mode, connect the ORP electrode (sold separately),
submerge into the solution, stir gently and let it stand still, wait for the reading to be stable and LCD
displays , get the reading which is the ORP value.
ORP means Oxidation Reduction Potential. The unit is mV.
5.3 Notes on ORP measurement
5.3.1 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 and see
whether ORP electrode or meter works properly.
5.3.2 Clean and activate ORP electrode
After the electrode has been used over a long period of time, the platinum surface will get tarnished
which can cause inaccurate measurement and slow response. Please refer to the following methods
to clean and activate ORP electrode:
(a) For inorganic tarnish, submerge the electrode in 0.1mol/L dilute hydrochloric acid for 30 minutes,
then wash it in distilled water, then submerge it in the electrode storage solution for 6 hours.
(b) For organic or lipid tarnish, clean the platinum surface with detergent, then wash it in distilled
water, then submerge it in the electrode storage solution for 6 hours.
(c) For heavily tarnished 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 electrode storage
solution for 6 hours.

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6ION CONCENTRATION MEASUREMENT
6.1 Preparation work
6.1.1 Press and switch to mode, connect to the ion combination electrode and the
temperature probe.
6.1.2 Choose the unit of the ion measurement:
Press to select the unit among pX→mol/L→ ppm(mg/L), select ppm or mg/L in
parameter setting P5.2. Note that the reading in the unit of mol/L shows in combinations.
See Diagram - 8, E-3 means 10-3, and the complete reading should be 1.00 x 10-3 mol/L. When
we use the unit of pX and ppm, the reading we get is the value, see Diagram - 7 and - 9.
6.1.3 Choose the ion type
The meter is built-in with 16 ions frequently being used: Ca2+, NH3, NH4+, NO3-, Cu2+, Cl-, Br-,
Pb2+, Cd2+, CN-, Na+, F-, I-, K+, Ag+and S2-.
Take F- as an example. Long press and enter parameter setting P5.0. Press ,
enter parameter setting P5.1, and then press to enter ion selection interface, see
Diagram - 10 (a), press or and move the cursor to , press to
confirm, see Diagram -10(b), and then press twice to go back to the measurement
mode, see Diagram -10 (c).
Diagram - 7
Diagram - 8
Diagram - 9
Diagram - 10
(a)
(b)
(c)

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When testing the concentration of ions other than the above 16 ions,
move the cursor to , press to confirm, see Diagram - 11.
Then press to switch among the concentration units:
pX→mol/L→ppm(mg/L).
Note: The unit of ion concentration can ONLY be switched in
parameter setting P5.1. Once set up, it will be fixed and cannot be
switched to other concentration units in measurement mode.
6.2 Ion calibration (Take F- electrode as an example, unit of mol/L, 3-point calibration)
6.2.1 Prepare F-calibration solutions: 1.00x10-3 mol/L, 1.00x10-4 mol/L and 1.00x10-5 mol/L. Make
sure that the unit of the calibration solutions is the same unit as the selected ion.
6.2.2 Rinse the fluoride ion combination electrode and the temperature probe in distilled or
deionized water, dip into 1.00x10-5 mol/L solution, gently stir and let it stand still, long press
and enter the calibration mode, the measurement value flashes, icon will
flash in the bottom right corner of the LCD. When the reading is stable and the stable
ion displays on LCD, press or to adjust the value to be 1.00 E-5 (1.00×10-5),
press to finish the 1st point calibration, the bottom left of LCD indicating ,
and icon flashes reminding the user to conduct the 2nd point calibration.
6.2.3 Shake off the excess liquid on the ion combination electrode, dip it into 1.00x10-4 mol/L
calibration solution, gently stir and let it stand still, when the reading is stable and the
stable icon displays on LCD, press or to adjust the value to be 1.00 E-4 (1.00
×10-4), press to finish the 2nd point calibration, the bottom left of LCD
indicating , icon flashes reminding the user to conduct the 3rd point
calibration.
6.2.4 Shake off the excess liquid on the ion combination electrode, dip it into 1.00x10-3 mol/L
calibration solution, gently stir and let it stand still, when the reading is stable and the
stable icon displays on LCD, press or to adjust the value to be 1.00 E-3
(1.00×10-3), press to finish the 3rd point calibration, the meter will automatically
go back to the measurement mode, the bottom left of LCD indicates .
Diagram - 11

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6.3 Notes on ion calibration
6.3.1 Ion calibration can be conducted with 1 point, 2 points or 3 points calibration.
(a) 1-point calibration: refer to Section 6.3.2, press and go back to the measurement mode
after the 1st point calibration. The bottom left of LCD indicates . Note that the default slope is
90%, suitable for low measurement of low accuracy requirement.
(b) 2 points calibration: refer to Section 6.3.3, press and go back to the measurement mode
after the 2nd point calibration. The bottom left of LCD indicates . For most of the cases, 2
points calibration will be good enough if the measurement value is between the two calibration
points.
(c) 3 points calibration: refer to Section 6.3.4, the meter goes back to the measurement mode after
the 3rd point calibration. The bottom left of LCD indicates , suitable for wide
measurement ranges.
6.3.2 Ion concentration calibration is suggested to be performed from low concentration to high
concentration, so that when calibration the second and the third point, the electrode
doesn't have to be rinsed and the solution contamination can be avoided.
6.3.3 Calibration error reminder
Ion electrode calibration may fail often. The reason could be calibration solution error, the quality
problem of the ion electrode or the improper operation. Such errors are not easy to be found, but
they can cause errors and could be misleading. The meter will automatically calculate the slope
when calibrating the 2nd and the 3rd points. When the slope is less than 75%, LCD will display
error indicator. See Diagram - 12, when pressing to calibrate becomes ,
indicating that calibration fails. When this happens, please check the solution, electrode and the
calibration method and then re-calibrate or reset the meter to factory default and then re-
calibrate.
6.3.4 Ion calibration will not automatically recognize solution. If
there's calibration error, press key to exit and then re-
calibrate. User can also "reset to factory default setting"
(select Yes in parameter setting P5.3), then calibrate again.
6.3.5 The ion calibration solution has no buffer and could easily
be contaminated, especially the low ion-concentration
solutions. Therefore, the calibration solution must be
prepared very carefully. Make sure all clean to prevent
contamination.
Diagram - 12

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6.4 Ion measurement
6.4.1 Rinse the fluoride ion combination electrode and the temperature probe in distilled or
deionized water, allow it to dry, dip it into the sample solution, stir gently and let it stand
still and wait for the reading to be stable. When the stable icon displays on LCD, get
the reading which is the concentration of the F-.
6.4.2 Press to switch among other ion concentration units: mol/L→mg/L (ppm) →pX.
6.4.3 The calibration and the measurement of the ion electrode is complicated. Sometimes user
needs to add the ion strength adjuster buffer or use a magnetic stirrer to improve. Please
refer to the ISE user manual for the electrode maintenance, activation, sample preparation
and other important information involving the calibration solution and the ion strength
adjuster buffer solution.
6.4.4 Factory default setting
For factory default setting, please refer to parameter setting P5.3. 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
and then perform re-calibration or measurement. Please note once factory default setting is set, all
the data deleted will be irretrievable.
6.5 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 Table - 6.
Table - 6 Self-diagnosis information
Display Icons
Contents
Checking
Press when measuring value
is not stable during calibration.
Press after icon displays and
stays on screen
During calibration, the measuring
value being unstable (≥3min).
Check whether the ISE works properly and
refer to the ISE user manual.
ISE slope<75%
Check calibration solution and the ISE, re-
calibrate.

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7PARAMETER SETTING
7.1 Main menu of parameter setting
Long press in measurement mode, the meter enters P1.0 mode, then press or to
change menu P1.0→P5.0→P6.0. For details, please see Diagram - 13. P1.0 is the menu for pH setup;
P5.0 for Ion menu and P6.0 for basic parameter menu.
Diagram - 13
Main menu of parameter setting
Sub-menu of pH parameter setting
Sub-menu of ion parameter setting
Sub-menu of basic parameter setting
P1.1 pH buffer solution
P1.2 Resolution
P1.3 Factory default setting
P1.1 Select the ion
P1.2 Select between ppm and mg/L
P1.3 Factory default setting
P6.1 Temperature unit
P6.2 Automatic lock-up
P6.3 Select backlight timing
P6.4 Automatic power-off

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7.2 Sub-menu of pH parameter setting
Press in P1.0, enter P1.1 sub-menu of pH parameter setting, and then press or
to switch among P1.1→P1.2→P1.3.
P1.1 — Select pH buffer series (USA—NIST—CUS)
1. Press , USA icon flashes, press to select USA→nIS→CUS,
press to confirm.
USA—USA series; nIS—NIST series; CUS—Customized calibration.
2. Press to enter P1.2 or press to return.
P1.2 — Resolution（0.01—0.1）
1. Press and 0.01 flashes, press to select between
0 .01→0.1, Press to confirm.
2. Press to enter P1.3 or press to return.
P1.3 — Factory default setting（No—Yes）
Press , no flashes, press to select YES, press to
confirm, the meter returns to measurement mode.
No— Don’t restore to factory default; Yes—Restore to factory default.