Apera Instruments PH 8500 User manual

Version2.0
PH8500 Portable pH Meter
User Manual

Version2.0
Contents
1Introduction............................................................................................................................................ 3
1.1 Basic Features............................................................................................................................... 3
1.2 pH Measurement Features............................................................................................................3
2Specifications.........................................................................................................................................3
2.1 Main Specifications........................................................................................................................3
2.2 Other Specifications:...................................................................................................................... 4
3Instrument Description...........................................................................................................................4
3.1 LCD Display................................................................................................................................... 4
3.2 Keypad Functions..........................................................................................................................5
3.3 Meter Socket..................................................................................................................................7
3.4 Display Mode................................................................................................................................. 7
3.5 Store, Recall and Clear Data......................................................................................................... 8
3.6 Auto. Power-off ..............................................................................................................................8
3.7 Manual Temperature Compensation (MTC)..................................................................................8
4pH Measurement................................................................................................................................... 8
4.1 pH Electrode Information............................................................................................................... 8
4.2 pH Calibration Consideration.........................................................................................................9
4.3 pH Calibration (take three-point calibration as an example).......................................................10
4.4 Customer-defined calibration........................................................................................................11
4.5 Sample Test .................................................................................................................................12
4.6 pH Electrode Maintenance .......................................................................................................... 13
5mV Measurement................................................................................................................................14
5.1 ORP Measurement...................................................................................................................... 14
5.2 Notes:........................................................................................................................................... 14
6Parameter Setting................................................................................................................................15
7USB Communication........................................................................................................................... 18
7.1 Software Requirement.................................................................................................................18
7.2 Software Interface........................................................................................................................19
7.3 Install Software ............................................................................................................................ 19
7.4 Automatic Connection Port..........................................................................................................20
7.5 Operation Software...................................................................................................................... 20
8What’s in the Kit?.................................................................................................................................21
9Recommended pH Electrodes for different Applications.....................................................................21
10 Warranty ..............................................................................................................................................22
11 Appendix I: Parameter Setting and Factory Default Setting............................................................... 23
12 Appendix II: Abbreviation Glossary .....................................................................................................23

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1 Introduction
Thank you for purchasing PH8500 portable pH meter.
This product is a great combination of advanced electronics technology, sensor technology, and
software design, made for general water solution applications such as water treatment, environmental
monitoring, pools and spas, hydroponics, aquaculture, education, beverage making, cooling tower, etc.,
especially ideal for field use. In order to use and maintain the instrument properly, please read the
manual thoroughly before use.
1.1 Basic Features
⚫The microprocessor-based portable meter features automatic calibration, automatic
temperature compensation, function set-up, self-diagnostics, due calibration reminding,
calibration date checking, automatic power-off and low voltage display.
⚫Meet GLP, clock display, manual storage and automatic timing storage, USB port.
⚫The meter’s digital filter improves measurement speed and accuracy. There is
reading stability display.
⚫The package includes portable case, meter, electrode, standard solutions, soaking solutions, and all
accessories, 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. There are three options of
standard buffer solution: USAseries, NIST series and customer-defined solution.
⚫The meter provides three kinds of reading stability criteria.
2 Specifications
2.1 Main Specifications
Specifications
pH
Measuring Range
(-2.00 ~ 16.00) pH
Resolution
0.1/0.01 pH
Accuracy
±0.01pH ±1 digit
Temperature
compensation
(0 ~ 100) °C (manual or automatic)
mV
Measuring Range
±1,999mV
Resolution
±200 mV:0.1mV;others:1 mV
Accuracy
±0.1% F.S ±1 digit
Temperature
Measuring Range
-10~110°C

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Resolution
0.1℃
Accuracy
±0.5℃±1 digit
2.2 Other specifications:
Data storage
500 groups
Storage content
Serial number, date, time, measuring value,
measuring unit and temperature value
Output
USB
Power
AA batteries ×3 (1.5V×3)
IP rating
IP57 waterproof and dust proof
Dimension & Weight
Meter: (86×196×33 ) mm / 335 g
Portable case: (330×270×82 ) mm /1.3 kg
3 Instrument Description
3.1 LCD Display：
(1) —Measuring mode icons
(2) —Measurement reading
(3) —Timing storage icon. When this icon appears, the meter is in the automatic storage mode
(4) —Date and time, or prompts of special display mode
(5) —Units of date and time
(6) —Units of measurement
Diagram-2
LCD
⑰
HOLD

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(7) —Temperature units
(8) —Units of calibration value
(9) —Standard calibration value, the serial number for storage and recall, and prompts of special
display mode
(10) —Storage and recall icons,
M+ —Measurement to be stored icon, RM —Reading to be recalled icon
(11) —Temperature value, and prompts of special display mode
(12) —Temperature compensation icons; ATC —automatic temperature compensation,
MTC —manual temperature compensation
(13) —Calibration guide icon
(14) —USB icon，when this icon appears, the meter connects the computer
(15) —Stability icon of readings
(16) —Low battery icon, when this icon appears, please renew the battery
(17) —Auto. Hold icon of readings
3.2 Keypad Functions
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.
Notes: In the calibration mode or the parameter set-up mode, pressing is invalid. Please press
key to return to the measurement mode, then press to turn off the meter.
Diagram-3
Keypad

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Chart –1 Keypad operations and descriptions
Keypad
Operations
Descriptions
Short press
⚫In the power-off mode, press this key to turn on the meter;
⚫In the measurement mode, press this key to turn on or turn off the
backlight display.
Long press
⚫In the measurement mode, press and hold this key for 2 seconds to turn
off the meter.
Short press
Select measurement parameter:
⚫→
Short press
⚫In the measurement mode, press this key to enter in the calibration
mode;
⚫In the auto. hold mode (HOLD), recall mode (RM) or other 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 set-up mode, press this key to select programs;
⚫In the recall mode (RM), press this key to return to the measurement
Mode.
Short/
long press
⚫In the measurement mode, long press to enter manual temperature
compensation mode, long press this key or short press to increase
temperature value;
⚫In the measurement mode, press this key to store the measuring value;
⚫In the recall mode (RM), short press this key to change the storage serial
number, press and hold this key to change the number quickly;
⚫In the parameter set-up mode, press this key to change the serial
number of the main menu and the sub-menu;
⚫In the sub-menu mode, press this key to change parameters and setup.
Short/
long press
⚫In the measurement mode, long press to enter manual temperature
compensation mode, long press this key or short press to decrease
temperature value;
⚫In the measurement mode, press this key to recall the last stored value;
⚫In the recall mode (RM), press momentarily this key to change the
storage serial number, press and hold this key to change the number
quickly;
⚫In the parameter set-up mode, press this key to change the serial
number of the main menu and the sub-menu;
⚫In the sub-menu mode, press this key to change parameters and setup.

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3.3 Meter Socket
Electrode socket displays as Chart –2. USB socket displays as Chart–3.
Chart –2 Sockets for meters
Models
Photos
Description
PH8500
pH meter
⚫BNC socket (right) —connect pH
electrode or ORP electrode,
⚫RCA socket (middle) —connect
temperature probe
Chart –3 USB socket
Functions
Connect to meter
Description
USB communication
⚫The meter has USB communication
function, connecting the meter to a
computer by USB cable with the
installation of PC-Link software
(Windows-based computer only,
included in a flash drive)
3.4 Display Mode
3.4.1 Reading stability display mode
When the measuring value is stable, smiley icon appears on LCD,
see Diagram –4. If the icon does not appear or flash, please do not
record the reading value or make 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 over a longer time, “Low”is set for stability over a
shorter time. User can select suitable stability criteria according to different
testing requirement.
3.4.2. Automatic lock-up display mode
Select On from parameter P3.6 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.
Diagram - 4
Diagram - 5

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3.5 Store, Recall and Clear Data
3.5.1. Manual storage
When the measurement is stable, short press key,
M+ icon and storage serial number appear on LCD, storing measuring
information, see Diagram –6.
3.5.2. Automatic timing storage
Set the storage timing (eg. 3 minutes) in parameter setting P3.3, icon
appears on LCD and the meter enters the timing storage mode. When
short press key, key flashes and the first measuring value is stored.
After 3 minutes, the 2nd measuring value is stored. See Diagram –7: the meter
stores automatically eight measuring values. When short press key,
icon stops flashing and the meter stops automatic storage. In automatic
storage mode, manual storage does not work. Set time 0 in parameter setting
P3.3 to exit from the automatic storage mode.
3.5.3. Recall stored data
In the measurement mode, press key to recall the last stored
measuring value. See Diagram –8: display RM icon and storage serial
number. Continue pressing key and key to recall successively the
stored measuring value. Press and hold key and key to recall the
stored measuring value quickly. Press to return to measuring mode.
3.5.4. Clear stored data
Select YES per parameter P3.6 to clear all stored value, refer to Section 7.5.
3.6 Auto. Power-off
The meter will be power-off after the meter stops operation for 20 minutes. To set automatic power off time
in parameter setting P3.7
3.7 Manual Temperature Compensation (MTC)
When the temperature probe is not connected to the meter, press and hold key or key,
temperature value flashes, then press (or press and hold) key or key to change the temperature
value, and press key to confirm.
4 pH Measurement
4.1 pH Electrode Information
The meter connects to 201T-F plastic three-in-one combination pH electrode with built-in temperature
sensor, with automatic temperature compensation function. Electrode housing is made of polycarbonate
engineering plastics, which is corrosion and impact resistant. The BNC socket of electrode connects pH
Diagram - 6
Diagram - 7
Diagram - 8

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socket. RCA socket connects temperature socket. When dipping pH electrode in the solution, please stir
the solution briefly to eliminate any air bubbles and allow it to stay in the solution until the reading is stable.
Note: The 201T-F Combination Glass pH/temp. Electrode is only suitable for general water solutions’ pH
measurement. For special applications such as low ion concentration or complex solutions, please refer to
Section 9 to find the most suitable pH electrode model.
4.2 pH Calibration Consideration
4.2.1. Standard buffer solution
The meter uses two series of standard buffer solution: USA series and NIST series, each series consists
of 5 groups solution, icons see Chart - 4
Chart - 4 pH standard buffer solution series
Calibration guide icons
pH standard buffer solution series
USA series (USA)
NIST series (NIS)
Three-point
calibration
1.68 pH and 4.00 pH
1.68 pH and 4.01 pH
7.00 pH
6.86pH
10.01 pH and 12.45 pH
9.18 pH and 12.45 pH
4.2.2. Three-point calibration
The instrument can perform 1-3 points calibration. The first point calibration must be 7.00 pH (or 6.86 pH)
standard solution, then select other standard solution to perform the second and the third point calibration,
see Chart-5. Chart - 5 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 or 1.68pH
6.86 pH→4.01 or 1.68pH
Range<7.00pH
7.00 pH→10.01 or 2.45pH
6.86 pH→9.18 or 12.45pH
Range>7.00pH
Three-point
calibration
7.00pH→4.00 or1.68pH
→10.01 or12.45pH
6.86pH→4.01or 1.68pH
→9.18 or 12.45pH
Wide Range
4.2.3. Calibration frequency
Calibration frequency depends on the sample, the electrode performance, and the required accuracy. For
high accuracy measurements (≤ ±0.03pH), the meter should be calibrated immediately before taking a
measurement. For general accuracy (≥ ±0.1pH), the meter can be calibrated and used for approximately
one week before the next calibration. The meter must be re-calibrated in the following situations:
(a) New probe, or probe that is unused for a long period of time
(b)After measuring acids (pH<2) or alkaline solutions (pH>12)

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(c)After measuring a solution that contains fluoride or a concentrated organic
solution
(d) If the solution’s temperature differs greatly from the calibration solution
temperature
4.2.4. Due calibration
Preset calibration interval (begin from the date of last calibration) to remind due
calibration in a preset period in parameter setting P1.4 (Section 7.3). During due calibration, Er5icon
appears on LCD (see Diagram –9). The meter can not continue operation and Er5icon disappears until
the calibration is done, or
when select “No”in parameter setting P1.4.
4.2.5. Check calibration date
Check the date and time of last calibration to decide whether new calibration is
needed. Please refer to parameter setting P1.5 (Section 7.3).
4.3 pH Calibration (take three-point calibration as an example)
4.3.1. The 1st point calibration
a) Press key to enter the calibration mode, CAL 1 flashes at the top right
of LCD and “7.00 pH” flashes 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 or deionized water, allow it to dry, 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. LCD displays
stable , press to finish 1st point calibration, meter goes to
measurement mode, the bottom left of LCD indicating , See Diagram –10.
4.3.2. The 2nd point calibration
Press key to enter the calibration mode, CAL2 flashes at the top right of LCD, indicating make the 2nd
point calibration. rinse pH electrode in distilled or deionized water, allow it to dry, 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 4.00 pH, stable icon displays and stays on LCD. Press
the key to calibrate the meter. electrode slope of acidity range display after calibration is done, the
2nd point calibration finished, meter goes to measurement mode, the bottom left of LCD
indicating .
Diagram - 9
Diagram - 10

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4.3.3. The 3rd point calibration
Press key to enter the calibration mode, CAL 3 flashes at the top right of LCD indicating make the 3rd
point calibration. rinse pH electrode in distilled or deionized water, allow it to dry, submerge it in pH10.01
buffer solution, Stir the solution briefly and allow it to stay in the buffer solution until the reading is
stabilized. 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, stable icon displays and stays on LCD. Press
key to calibrate the meter. Electrode slope of acidity range display after calibration is done.After the
3rd point calibration is completed, meter goes to measurement mode, the bottom left of LCD
indicating .
Notes:
(a) The meter can perform 1-3 points calibration. When the 1st point calibration is done, the meter will
enter 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 stay on and the
key is pressed, then Er 2 will display. (See chart –5). To solve the problem, simply wait for to
stay on the screen before pressing
(c) To exit from the calibration mode, press key.
4.4 Customer-defined Calibration (take 1.60 pH and 6.50 pH calibration solution as an
example)
4.4.1. Select CUS from parameter setting P1.1 (please refer to Section 7.3 for customer-defined solution).
The meter enters Customer-defined calibration mode.
4.4.2. Rinse pH electrode in distilled or deionized water, allow it to dry, and submerge it in pH1.60 buffer
solution. Stir the solution briefly and allow it to stay in the buffer solution until a stable reading is reached.
When LCD displays the stable measuring value and icon, press key and the measuring value
flashes. CAL1 flashes at the top right of LCD, indicating 1st point calibration of customer-defined solution.
Press key or key to adjust the measuring value to 1.60, then press key to calibrate the
meter. After calibration is done, meter goes to measurement mode.
4.4.3. Rinse pH electrode in distilled or deionized water, allow it to dry, and submerge it in pH 6.50 buffer
solution. Stir the solution briefly and allow it to stay in the buffer solution until a stable reading is reached.
When LCD displays the stable measuring value and icon, press key and the measuring value
flashes. CAL 2 flashes at the top right of LCD, indicating 2nd point calibration of customer-defined solution,
press key or key to adjust the measurement value to 6.50, then press key to calibrate the
meter. After calibration is done, the meter returns to the measurement mode.
Notes:
a)For manual temperature compensation (no temperature probe is plugged in RCA socket), when
is pressed, temperature value flashes. Press key or key to adjust the temperature value, and
then press key, pH measuring value flashes.
b) The meter can perform 1-2 points customer-defined calibration. When the 1st point calibration is done,
the meter goes to measurement mode automatically. Same in customer-defined 2nd point calibration.

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Press key to enter
into the calibration
mode.
c) The value set in “Customer-defined”is at a fixed temperature. The meter is suggested to perform
calibration and measurement at the same temperature to avoid large error. The meter cannot
automatically recognize customer-defined calibration solution.
4.5 Sample Test
4.5.1. Rinse pH electrode in distilled or deionized water, allow it to dry, and submerge it in sample solution.
Stir the solution briefly and allow it to stay in the sample solution until the stable value and icon
appears on LCD, get the reading which is pH value of sample solution, please refer to Diagram-11 for
calibration and measurement process of pH meter.
Diagram –11 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 Chart –6.
Chart –6 Self-diagnosis information of pH measurement mode
Display
Icons
Contents
Checking
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.
Press key when measuring value
is not stable during calibration.
Press key after icon appears and stays
on screen.
During calibration, the measuring value
is not stable for ≥3min.
1.Check whether there are bubbles in glass bulb.
2.Replace with a 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.
Submerge the electrode
in pH4.00 solution, press
key when icon
appears.
Press to turn on
the meter.
Press key to enter
the calibration mode.
Submerge the electrode
in pH7.00 solution, press
key when icon
appears.
1st point calibration is
done, meter goes into
measurement mode.
1st point calibration
Sample
Test
2nd point
calibration
3rd point calibration
2nd point calibration is
done, meter goes into
measurement mode.
3rd point calibration is
done, meter goes into
measurement mode
Submerge the electrode
in pH10.01solution,press
key when icon
appears.
Press key to enter
the calibration mode.

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Enter in pre-set due calibration date
reminder
Press key to perform calibration or cancel due
calibration setup per parameter P1.4
4.5.3. pH temperature principle
Please note that the closer the temperature of the sample solution is to the calibration solution, the more
accurate will be the readings.
4.5.4. Factory default setting
For factory default setting, please refer to parameter P1.6 (Section 7.3). 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-I). 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 irretrievable.
4.6 pH Electrode Maintenance
4.6.1. 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 or deionized 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 solution. The
soaking/storage solution is 3M KCL (SKU: AI1107). Using other brand’s storage solution might cause
potential damage to the electrode.
The electrode should not be stored in distilled or deionized water, protein solution or acid fluoride solution.
In addition, do not soak the electrode in organic silicon lipids. For best accuracy, always keep the meter
clean and dry, especially the meter’s electrode socket. Clean with medical cotton and alcohol if necessary.
4.6.2. 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.
4.6.3. 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, wash the electrode with distilled or deionized water and then throw off the excess water on
the electrode. Do not clean the glass bulb with a tissue for it will affect the stability of the electrode
potential and increase the response time. The electrode should be thoroughly cleaned if a sample sticks to
the electrode. Use a solvent if the solution does not appear clean after washing.
4.6.4. Renew glass bulb
Electrodes that have been used over a long period of time, will become aged. Submerge the electrode in
0.1 mol/L hydrochloric acid for 24 hours, then wash the electrode in distilled or deionized water, then

14
submerge it in soaking solution for 24 hours. The method to prepare 0.1mol/Lhydrochloric 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 wash it in distilled or deionized water, then submerge it in
the soaking solution for 24 hours to renew it.)
4.6.5. Clean contaminated glass bulb and junction (see Chart –7)
Chart –7 Clean contaminated glass bulb and junction
Contamination
Cleaning Solutions
General tough contaminants
Apera Electrode Cleaning Solution (SKU:AI1166)
Organic lipid
Dilute detergent (weak alkaline)
Resin macromolecule
Dilute alcohol, acetone, ether
Proteinic sediment
Apera Electrode Cleaning Solution (SKU:AI1166)
Paints
Dilute bleacher, peroxide
Notes:
The 201T-F electrode housing is polycarbonate. When using cleaning solutions, take precautions
with carbon tetrachloride, trichlorethylene, tetrahydrofuran, acetone, etc. as these will dissolve the
housing and invalidate the electrode.
5 mV Measurement
5.1 ORP Measurement
Press key, and switch the meter to mV measurement mode. Connect 301Pt-C ORP electrode (SKU:
AI1303, sold separately) and dip it in sample solution, stir the solution briefly and allow it to stay in the
solution until icon appears and get the reading which is ORP value. ORP is in short for Oxidation
Reduction Potential. The unit is mV.
5.2 Notes:
5.2.1. 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.
5.2.2. Clean and activate ORP electrode
After the electrode has been used over long period of time, the platinum surface will get contaminated and
will lead to inaccurate measurements and slow responses. Please refer to the following methods to clean
and activate ORP electrode:
(a) For inorganic pollutants, submerge the electrode in 0.1mol/L dilute hydrochloric acid for 30 minutes,
then wash it in distilled or deionized water, then submerge it in the soaking solution for 6 hours.
(b) For organic or lipid pollutants, clean the platinum surface with detergent, then wash it in distilled or
deionized water, then submerge it in the soaking solution for 6 hours.

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(c) For heavily polluted platinum surface on which there is an oxidation film, polish the platinum surface
with toothpaste, then wash it in distilled or deionized water, then submerge it in the soaking solution for 6
hours.
6 Parameter Setting
6.1 Main Menu
In the measurement mode, press key to enter in P1.0, then press or to switch to main
menu: P1.0→P3.0. Please refer to Diagram –14.
P1.0: pH parameter setting;
P3.0: Basic parameter setting.
6.2 Sub-Menu
6.2.1. In P1.0 mode, press key to enter in sub-menu P1.1 of pH parameter setting, then press
and key to switch among sub-menu: P1.1→P1.2→P1.3→P1.4→P1.5→P1.6, See Diagram–14.
6.2.2. In P3.0 mode, press key to enter in sub-menu P3.1 of TDS parameter setting, then press
and key to switch among sub-menu: P3.1→P3.2→P3.3→P3.4→P3.5→P3.6→P3.7→P3.8, See
Diagram –14 below.
P1.1 Select pH standard solution
P1.2 Select resolution
P1.3 Set stability criteria
P1.4 Set due calibration
P1.5 Check calibration date
P1.6 Restore to factory default setting
P3.1 Select temperature unit
P3.2 Select backlight time
P3.3 Adjust timing storage time
P3.4 Adjust date
P3.5 Adjust time
P3.6 Clear stored value
P3.7Automatic power-off setup
P3.8 Automatic hold setup
Sub-menu of pH parameter setting
Sub-menu of basic parameter setting
Main menu of parameter setting
Diagram –14

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6.3 Sub-Menu of pH Parameter Setting (press or key to switch)
P1.1 –Select pH standard solution (USA-NIST-CUS)
1. In measurement mode, press key to enter in P1.0, press to
enter in P1.1.
2. When key is pressed, USA flashes, press key to select
USA→nIS→CUS, press to confirm.
USA-USA series; nIS-NIST series; CUS- customer-defined.
3. After confirming 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. When key is pressed, 0.01 flashes, then press key to select
0.01→0.1, press key to confirm.
2.After confirming parameter, press key to enter in P1.3 mode, or
press key to return to the measurement mode.
P1.3 –Set stability criteria (Normal –High –Low)
1. Press key, nor flashes. Press key to select nor→HI→Lo, press
to confirm. Nor –Normal, Hi –High, Lo –Low.
2.After confirming parameter, Press key to enter in P1.4 mode, or
press key to return to the measurement mode.
P1.4 –Set due calibration (No –H00 –D00)
1. Press key, no flashes, then press key to select no→H00→d00
Press to confirm.
2. When H flashes, press key, 00 flashes. Press key to adjust
hours (0~99 hours), press key to confirm; When Dflashes. press
key, 00 flashes. Press key to adjust days (0~99 days), press
to confirm.
3. After confirming parameter, press key to enter in P1.5 mode, or
press key to return to the measurement mode.
P1.5 - Check the time and date of the last calibration
1. The time and date of calibration displays alternately at top right of LCD
(Date display: Month –Day), the number in the LCD middle displays
Year (Year 2016).
2. Press key to enter in P1.6 mode, or press key to return to the
measurement mode.

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P1.6 –Restore to factory default setting (NO –Yes)
1. Press key, no flashes, then press key to select no →YES,
Press key to confirm, the meter returns to the measurement
mode. No –not restore to factory default setting, Yes –restore to
factory default setting.
2. Press key to return to the measurement mode.
6.4 Sub-menu of Basic Parameter Setting (press key or key to switch)
P3.1 –Select temperature unit (°C —°F ).
1. In P3.0 mode, press key enter P3.1, see left diagram.
2. Press key, °C flashes, press to select °C →°F, then press
key to confirm,
3. After confirming the parameter, press key to enter in P3.2 mode. or
press key to return to the measurement mode.
P3.2 –Select backlight timing (1-2-3-On)
1. When press key, 1 flashes, then press key to select 1→2→3
→On. When the parameter flashes, press key to confirm. Select On
to turn on the back light, the time unit is minute.
2.After confirming the parameter, press key to enter in P3.3 mode or
press key to return to the measurement mode.
P3.3 –Adjust timing storage time
1. When key is pressed, :00 flashes, press key and key to
adjust Timing (0~59), press key, 00: flashes: adjust hours (0-99),
press to confirm.
2. After confirming the parameter, press key to enter in P3.4 mode or
press key to return to the measurement mode.
P3.4. –Adjust date
1. When key is pressed, Month flashes, then press and Date
flashes, then press and Year flashes. When the number flashes,
press key or key to adjust date, then press to confirm.
2. After confirming the above parameters (the numbers stop blinking),
press key to enter in P3.5 mode or press key to return to the
measurement mode.

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P3.5. –Adjust time
1. When key is pressed, Hour flashes, then press and Minute
flashes. When the number flashes, press key and key to adjust
time, then press to confirm.
2.After confirming date, press key to enter in P3.6 mode or press
key to return to the measurement mode.
P3.6. –Clear all storage value (No—Yes)
1. When key is pressed,No flashes, then press key to select No
—Yes, press key to confirm. No: not delete, Yes: Delete.
2. After confirming the parameter, press key to enter mode P3.7 or
press key to return to the measurement mode.
P3.7 –Automatic power-off setup (10→20→30→On)
1. Press key, On flashes, press key to select 10→20→30→On,
press key to confirm.
On –turn off automatic power-off, Time unit is minutes.
2. After confirming the parameter, press key to enter P3.8 or press
to return to the measurement mode.
P3.8 –Set automatic lock-up function（Off→On）
1. Press key, OFF flashes, then press key to select OFF→On,
press key to confirm. Off: not set, On: set (the reading is
automatically locked when stabilizes＞10 seconds.)
2. After confirming the parameter, press key to enter measurement
mode.
7 USB Communication
7.1 Software Requirement
The meter uses “PC-Link” software connected to via USB port. The recommended requirement for the
computer are: Personal computer (Microsoft Excel 2000 or the version of higher rank) which can operate
Windows XP operation system, PC –IBM compatible with XT and CD-ROM driver, USB communication
port.

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7.2 Software Interface
Software interface: see Diagram-15.
①—Meter serial number
②—Stored value
③—Keys
Clear —press this key to clear the data
Download —press this key to download the data from the meter to the computer
Export —press this key to export the stored value to Microsoft Excel file
Exit —press this key, PC-Link program exits from the computer interface
7.3 Install Software
Please follow the steps as below to load PC-Link to the computer:
Open “PC-Link”file→double click “Setup” program →click “OK”→ click icons (see Diagram –16) →click
“Continue”→ click “Confirm”.
Diagram -15

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Diagram –16
7.4 Automatic Connection Port
Connect USB cable to the meter and the computer, open PC-Link program, program interface shows on
the computer, automatic connection is done after a few seconds. Icon shows at the left bottom of LCD.
Note:
To reconnect after turn-off, please restart the software interface, as the computer can not
recognize the software automatically.
Besides, this software only recognizes 1-16 port numbers. For other port numbers, please set in
“device manager”of the computer.
7.5 Operation Software
7.5.1. Upload the stored value
Press Download key, all the data stored in the meter is downloaded to the computer. pH, mV, COND and
TDS are sorted in the program.
7.5.2. Real-time storage.
During operation, press key to store or set timing storage. The measuring information is downloaded
to the computer through USB and will not be stored in the meter. The stored data during operation is the
same as the data shown on the meter.
7.5.3. Data processing
Press Export key to export the stored value to Microsoft Excel file to further analyze or print the stored
data.