Apera Instruments EC950 User manual

EC950 Benchtop Conductivity Meter
Instruction Manual
PH950 Benchtop pH Meter
EC950 Benchtop Cond. Meter
PC950 Benchtop pH/Cond. Meter
APERA INSTRUMENTS (Europe) GmbH
www.aperainst.de

Table of Contents
1. Introduction................................................................................................................................... - 1 -
Measurement parameter....................................................................................................- 1 -
Basic features.................................................................................................................... - 1 -
pH measurement features .................................................................................................- 1 -
Conductivity measurement features...................................................................................- 1 -
2. Meter Kits ..................................................................................................................................... - 2 -
3. Specifications ...............................................................................................................................- 3 -
Technical parameters.........................................................................................................- 3 -
Other technical parameters................................................................................................ - 3 -
4. Instrument Description..................................................................................................................- 4 -
LCD display ....................................................................................................................... - 4 -
Keypad functions ............................................................................................................... - 5 -
Meter sockets .................................................................................................................... - 6 -
Display mode.....................................................................................................................- 7 -
Data storage, recall and delete ..........................................................................................- 7 -
Manuals adjust temperature...............................................................................................- 9 -
Install meter with multi-function test bench......................................................................... - 9 -
Installation of flexible electrode holder ............................................................................... - 9 -
Multi-function Test Bench...................................................................................................- 9 -
5. pH measurement........................................................................................................................ - 10 -
Default Electrodes Information......................................................................................... - 10 -
pH calibration related information .................................................................................... - 12 -
pH meter calibration (take three-point calibration as an example).................................... - 13 -
Custom-defined calibration (take 2.00pH and 7.30pH calibration solution as example).... - 15 -
Self-diagnostic Information............................................................................................... - 16 -
Solution measurement..................................................................................................... - 16 -
6. mV measurement ....................................................................................................................... - 17 -
ORP measurement .......................................................................................................... - 17 -
Notes for ORP measurement........................................................................................... - 18 -
Ion potential measurement............................................................................................... - 18 -
7. Conductivity Measurement ......................................................................................................... - 18 -
Conductivity probe information......................................................................................... - 18 -
Conductivity calibration related information...................................................................... - 19 -
Conductivity meter calibration (take 1413μS/cm calibration as an example) .................... - 20 -
Custom-defined calibration (take 10μS/cm standard solution as an example).................. - 21 -
Self-diagnostic information............................................................................................... - 21 -
Solution measurement..................................................................................................... - 22 -
Conductivity probe maintenance...................................................................................... - 23 -
8. Parameter setting ....................................................................................................................... - 24 -
Main menu and submenu ................................................................................................ - 24 -
Operation......................................................................................................................... - 24 -
Content of parameter setting............................................................................................ - 25 -
9. Stirrer ......................................................................................................................................... - 25 -

Operation......................................................................................................................... - 25 -
Specification .................................................................................................................... - 26 -
Notes ............................................................................................................................... - 26 -
10. USB communication ................................................................................................................... - 26 -
Install Software ................................................................................................................ - 26 -
Software Interface............................................................................................................ - 27 -
Operation Keys of PC-Link............................................................................................... - 27 -
11. Recommended pH Electrodes for Specific Applications.............................................................. - 28 -
12. Recommended Conductivity Electrodes for Specific Applications ............................................... - 28 -
13. Warranty..................................................................................................................................... - 29 -
Notes
•When the meter is connected to PC, do not pull out the USB cable until the meter is
turned off. Otherwise, a system crash could occur. To fix the crash, pull out the power
cord, put it back in, and reboot the meter.
•Please do NOT pull out the power cord when the meter is turned on.

- 1 -
1. INTRODUCTION
Thank you for purchasing our EC950 Benchtop Conductivity Meter.
Before using this meter, please read the operation manual carefully to help use and maintain it
correctly.
Measurement parameter
Measurement parameter
PH950
EC950
PC950
pH/mV
√
√
Cond./TDS/Salinity
√
√
Temperature
√
√
√
Electrode Stand
√
√
√
Basic features
⚫TFT color display, large size, ultra legible.
⚫Operating navigation expressed by graphic and text, more convenient to use.
⚫Multi language operating system (English, German, Spanish & Chinese)
⚫Smiling icon indicates the reading stability, including automatical lock on function.
⚫With built-in microprocessor chip, the meter has intelligent functions like automatic calibration,
automatic temperature compensation, function setting, self-diagnostic information, and storage.
⚫PC950 meter can measure and display pH & conductivity value at same time.
⚫Meter can configure with 606 multi function test bench which is combined by intelligent stirrer and
flexible electrode holder. It can hold solution bottles, electrodes, and stirrer beads. Stepless speed
regulation intelligent stirrer, it can also store rotating speed.
pH measurement features
⚫1~3 point automatic calibration with calibration instruction and automatic checking functions.
⚫Automatically recognize pH buffer solution. 3 series buffer solution selectable: USA series, NIST
series and CH, as well as custom-defined solution.
⚫Automatically display electrode slope.
Conductivity measurement features
⚫1~ 4 point automatic calibration with calibration instruction and automatic checking functions.
⚫Automatically recognize conductivity standard solution. 2 series standard solution selectable:
USA and CH, as well as custom-defined solution.
⚫With conductivity, TDS and salinity three measurement modes, can switch to display the results.

- 2 -
2. METER KITS
Description
Quantity
PH950
EC950
PC950
1
PH950 pH meter
1
√
2
EC950 conductivity meter
1
√
3
PC950 pH/conductivity meter
1
√
4
606 multi-function stirrers (includes flexible
electrode holder)
1
√
√
√
5
LabSen211 glass pH combination electrode
1
√
√
6
MP500 temperature probe
1
√
√
7
2401T-F conductivity probe（ATC, K=1.0）
1
√
√
8
pH buffer solution (4.00/7.00/10.01pH/50mL）
1 bottle each
√
√
9
Conductivity standard solution
(84μS/1413μS/12.85mS/50mL)
1 bottle each
√
√
10
Stirrer connection cable
1
√
√
√
11
PCLink-950 Flash Disk
1
√
√
√
12
USB communication cable
1
√
√
√
13
9V power adapter
1
√
√
√
14
Instruction manual
1
√
√
√
15
Quick manual
1
√
√
√

- 3 -
3. SPECIFICATIONS
Technical parameters
Technical Parameters
Model
pH
Measuring Range
（0.00 ~ 14.00）pH
PH950
PC950
Resolution
0.1/0.01 pH
Accuracy
±0.01 pH ±1 digit
Temperature
Compensation Range
（0 ~ 100）°C（Auto. or Manual）
Calibration point
1~3 points
mV
Measuring Range
±2000mV
Resolution
1mV
Accuracy
±0.1% FS ±1 digit
Cond.
Measuring Range
Conductivity：0~200 mS/cm, divided into five
ranges, automatically switch measuring range.
（0~19.99）μS/cm; （20.0~199.9）μS/cm;
（200~1999）μS/cm;（2.00~19.99）mS/cm;
（20.0~199.9）mS/cm
TDS： (0 ~ 100) g/L； Salinity：(0 ~ 100) ppt
EC950
PC950
Resolution
0.01/0.1/1μS/cm; 0.01/0.1 mS/cm
Accuracy
±1.0% FS ±1 digit
Temperature
Compensation Range
（0 ~ 50）°C（Auto. or Manual）
Cell constant
0.1 / 1 / 10 cm-1
Temp.
Measuring Range
0~100℃
PH950
EC950
PC950
Resolution
0.1°C
Accuracy
±0.5°C±1 digit
Other technical parameters
Data Storage
200 groups
Storage Content
Number, measuring value and temperature value
Power
DC9V/600mA
Dimension & Weight
Meter: (195×215×100) mm / 0.9kg

- 4 -
4. INSTRUMENT DESCRIPTION
LCD display
pH measurement interface
①pH measurement
②pH measuring value
③Temperature measuring value
④pH electrode slope
⑤Calibration solution indication icon
⑥Used data storage
⑦Temperature compensation icon,
MTC-manual temperature compensation
ATC-auto. temperature compensation
⑧Auto. lock on icon
⑨Stable reading icon
⑩Date and time
⑪Auto. data log
⑫Storage icon and number
⑬Stirrer icon
Conductivity measurement interface
①Conductivity measurement
②Conductivity measuring value and unit
③Temperature measuring value
④Conductivity parameter：
1.0 - conductivity cell constant
25.0°C - reference temperature
2.00% - temperature compensation
Coefficient
⑤Calibration solution indication icon
⑥Used data storage
⑦Temperature compensation icon,
MTC-manual temperature compensation
ATC-auto. temperature compensation
⑧Auto. Hold
⑨Stable reading icon
⑩Date and time
⑪Auto. data log
⑫Storage icon and number
⑬Stirrer icon

- 5 -
TDS measurement interface
①TDS measurement
②TDS factor 0.71
Salinity measurement interface
Salinity factor 0.5
pH/Cond. measurement interface
mV measurement interface
Keypad functions
Diagram-1
Keypad operation mode:
Short press—Press key and holding time < 2s, buzzer makes a “di” sound.
Long press—Press key and holding time > 2s, buzzer makes a “di” sould when pressing the
button, another “di” sound will ring after holding the key 2 seconds.

- 6 -
Chart -1 Keypad operations and functions
Keypad
Operations
Functions
Short press
⚫Power supply switch
Short press
Press key to select measurement mode:
⚫PH950: pH→mV
⚫EC950: Cond→TDS→Salt
⚫PC950: pH→mV→Cond→TDS→Salt→pH/Cond
Long press
⚫ Press key to enter temperature regulation mode
Long press
⚫In measurement mode, press key to enter in the calibration mode
Short press
⚫Cancel operation and return to measurement mode;
Short press
⚫In measurement mode: press key to enter parameter set-up main
menu.
⚫In calibration mode: press key to conduct calibration.
⚫In main menu mode: press key to enter in submenu.
⚫In submenu mode: press key to enter in parameter set-up.
⚫In parameter set-up mode: press key to confirm parameter.
⚫In temperature regulation mode: press key to confirm temperature
value.
Short press
⚫In measurement mode: press key to store measuring value,
press key to recall.
⚫In recall (RM) mode: press or key to turn page.
⚫In menu mode: press key to select items;
⚫In temperature regulation mode: press key to change temperature
value, hold key for fast changing.
Short press
⚫Stirrer switch
Long press
⚫Store stirrer speed
Short press
⚫Rotate according to the stored speed
Short press
⚫Press key to change rotating speed, hold key for fast changing.
Meter sockets
Model
Meter Sockets
PH950
① ② ③ ⑥ ⑦
EC950
④ ⑤ ⑥ ⑦
PC950
① ② ③ ④ ⑤ ⑥ ⑦

- 7 -
①BNC socket, connect with pH- or ORP combination electrode.
②RCA socket, connect with temperature sensor (for pH measurement).
①+②: BNC+RCA socket, connect with pH/ATC 3-in-1 combination electrode.
③Ф4 banana socket, connect with reference electrode.
④BNC socket, connect with conductivity cell.
⑤RCA socket, connect with temperature sensor (for conductivity measurement).
④+⑤: BNC+RCA socket, connect with Cond/ATC Elektroden.
⑥USB: Connect PC
⑦Ф2.5 power socket, Connect DC9V adaptor (inside “＋” outside “－”)
Display mode
Reading stable display mode
When the measuring value is stable, smiley icon
appears on LCD screen, see Diagram – 3. If the
smiley icon does not appear or flash, please do
not get readings or make calibration until the
measuring value is stable.
Auto. lock on display mode
In parameter set 3.1, set “Reading with HOLD” to “ON”, when icon stably display for more than
10 seconds, the meter will lock the value automatically and display HOLD icon. see Diagram – 4(b).
In HOLD mode, press key to cancel auto lock.
(a). (b).
Diagram-4
Data storage, recall and delete
Storage
(a) Manual data logger
Set “auto. timing” to “00:00:00”, Press key to store, icon 6 displays on the down right
corner of LCD screen which means it’s the 6th group data, see Diagram – 5(a); Each meter can store
200 groups data. For single parameter display mode, 1 serial number corresponds to 1 group
measuring vale. For dual parameter display mode (means pH + Cond. meter display mode), 1 serial
Diagram-3
(a)
(b)
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- 8 -
number corresponds to 2 groups measuring value (pH + conductivity). So for this type of meter,
actual store data is 200 groups, but storage number will be less than 200. If press key again when
storage value is full, icon will flash, see Diagram –5(c) to indicate store memory is already full
and need to be deleted for new store value.
(b) Auto. timing data logger
Select “Timer” in parameter setting 3.2 and set the data logging interval time (by all x Seconds or
minutes), for example, 3 minutes. In auto timing data logo mode, shows up, press to
start auto. data logger, flashes, the first set of measurement data is stored, then every three
minutes one set of data will be stored and the storage number will be automatically increased. Press
again to stop auto. data logger. In this mode, the manual data logging is invalid.
Recall
Press key, meter will display stored 6 groups measuring value, see Diagram – 5(b), press
or key to turn page. Every page displays 8 groups data.
Delete
Data need to be deleted when storage memory is full, otherwise no more data can be stored. In
parameter setting 3.3 select “Yes” and press key, see Diagram – 5(d) to delete all stored
value. Note: when connect the meter via USB cable to store the measured values to the
computer, there is no limitation on the number of data storage, either manual or automatic
storage.
（a）（b）
(C) (d)
Diagram-5

- 9 -
Manuals adjust temperature
In MTC mode, long press key to enter temperature regulation mode. Press or
key to adjust temperature value. Press and hold the key for fast adjustment. Press
key to confirm and return to measurement mode.
Install meter with multi-function test bench
Before installing
After installing
Diagram-6
Installation of flexible electrode holder
Diagram-7
Multi-function Test Bench
(a) Combo mode (b) Separation using (maximum distance 35cm)
Diagram-8
Meter
Mulit-function test bench
Stirrer connection cable
Connection bar
Aim hole to shaft
and press down

- 10 -
5. PH MEASUREMENT
Default Electrodes Information
The meter comes with a LabSen 211 pH combination electrode and MP500 temperature probe,
which enables the automatic temperature compensation. The LabSen pH electrodes are made with
proprietary sensor technologies and premium materials from Switzerland. LabSen 211 pH electrode
is designed for high-precision lab and field pH measurement of general water solutions. The
electrode is compatible with TRIS buffers.
For testing pH of special samples such as viscous (sticky), strong acidic or alkaline solutions,
solutions at high or low temperature (>50˚C or <10˚C), solid samples, turbid solutions, low ion-
concentration solutions & etc…specialized pH electrodes are necessary in order to achieve reliable
results. Regular pH electrodes in these special applications usually would generate inaccurate and
unstable measurements, and may be damaged by the samples, or even be non-applicable for testing
at all.
Please refer to Section 10 for ideal pH electrodes to use for other applications.
Features of LabSen 211 pH Electrode
⚫Built with LabSen S-type hemispherical glass membrane, featuring low resistance (fast
response) and high firmness
⚫No more air bubbles inside the glass membrane thanks to the Swiss blue gel electrolyte.
⚫The long-life reference system significantly increases measuring stability and extends service
life.
Technical Specifications of the LabSen211 pH Electrode
Measuring Range
0-14 pH
Temperature Range
23 to 212 ˚F (-5 to 100 °C)
Membrane Types
S
Body Material
Lead-free Glass
Reference
Long Life
Junction
Ceramic
Reference Solution
3M KCL
Soaking Solution
3M KCL
Membrane Resistance
<150 MΩ
Electrode Dimension
(Φ12×120) mm
Connector and cable length
BNC/1m

- 11 -
Technical Specifications of the MP500 Temperature Probe
Temperature Range
14 to 230 ˚F (-10 to 110 °C)
Body Material
Stainless Steel
Sensor
30 KΩ thermistor
Probe Dimension
(Φ5×145) mm
Connector
RCA
Connector and cable length
BNC/1m
How to use
1. Insert the blue BNC connector of the electrode to the BNC socket of
your pH meter while twisting clockwise until it`s locked, plug the RCA
connector into the “TEMP” sockets. Please note not to pull the cables
in case of poor contact. Please keep the connectors clean and dry.
2. Before measuring, twist off the storage bottle cap (see graph on the
right), pull out the electrode and rinse it off with distilled or deionized
water.
3. Unplug the blue rubber plug to maintain a smooth electrolyte flow.
4. Stir the solution briefly to eliminate the air bubbles and in this way, a
stable measurement will be reached fast.
5. Perform at least a two-point calibration before measuring after connecting the new electrode to
your pH meter.
6. After using, put the electrode back into the storage bottle, twist on the bottle cap, and plug in
the refilling hole.
Maintenance
1. When not in use, the electrode should be soaked in the storage bottle containing 3M KCL
soaking solution (SKU: AI1107) to keep the glass membrane and junction in a healthy
condition. Clean the bottle and replace the soaking solution if it gets contaminated. The
electrode should never be stored in pure water such as deionized or distilled water.
2. The reference solution will run low as you use the electrode. Whenever the solution level falls
to 1/2 height of the electrode, add 3M KCL solution (SKU: AI1107) to the refilling hole (unplug
the blue rubber plug) using a syringe or pipette.
3. The electrode is only as accurate as it is clean. Always thoroughly rinse off the electrode
before and after each measurement with pure water in a container or with a wash bottle.
4. For tough contaminants, soak the electrode in Apera cleaning solution (AI1166) for 30
minutes. Then use a soft brush to remove the contaminants. Afterwards, soak the electrode in
3M KCL solution (SKU: AI1107) for at least 1 hour. Rinse it off, then re-calibrate it before using
again.
5. The connector of the electrode should be kept clean and dry. If contaminated, please clean it
with medical cotton and isopropyl alcohol and blow-dry it to prevent short circuit of the
electrode or slow response of the electrode.

- 12 -
6. The electrode should avoid testing strong acid and strong alkali solutions, as well as
dehydrating media such as absolute ethanol and concentrated sulfuric acid. If testing such
solutions, the immersion time should be minimized, and the electrode should be carefully
cleaned after use.
7. Every pH electrode will eventually age and fail. The typical service life of Apera pH electrodes
is 12 to 24 months depending on the frequency of usage and how well you keep it clean and
properly stored. We recommend replacing your electrode every 12-18 months to ensure the
best performance.
pH calibration related information
Standard buffer solution
The instrument adopts three series standard buffer solution, USA, NIST and CH series, and also
custom-defined solution. Please see Chart – 2 for the three series of standard buffer solution. The
detail of custom-defined solution, see clause 7.3.
Chart -2 pH standard buffer solution series
Calibration indication icons
pH standard buffer solution series
USA series
NIST series
CH series
Three-point
calibration
or
pH 4.00 or 1.68
pH 4.01 or 1.68
pH 4.00 or 1.68
pH 7.00
pH 6.86
pH 6.86
or
pH 10.01 or 12.45
pH 9.18 or 12.46
pH 9.18 or 12.46
Note: calibration indication icons are example of USA series.
Three-point calibration
The instrument can perform 1~3 point calibration. In three-point calibration mode, 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 chart – 3. Users can choose two-point
calibration of pH 7.00 and pH 1.68 for strong acidic solutions (<pH 2), or pH 7.00 and pH 12.45 for
strong alkaline solutions (>pH 12).
Chart -3 Three-point calibration mode
USA standard
NIST standard
CH standard
Applicable range
One-point
calibration
pH 7.00
pH 6.86
pH 6.86
Accuracy
≤± 0.1pH
Two-point
calibration
pH 7.00 and
pH 4.00/1.68
pH 6.86 and
pH 4.01/1.68
pH 6.86 and
pH 4.00/1.68
< pH 7.00
pH 7.00
and pH
10.01/12.45
pH 6.86 and
pH 9.18/12.46
pH 6.86 and
pH 9.18/12.46
> pH 7.00
Three-point
calibration
pH 7.00,
pH 4.00/1.68 and
pH 10.01/12.45
pH 6.86,
pH 4.01/1.68 and
pH 9.18/12.46
pH 6.86,
pH 4.00/1.68 and
pH 9.18/12.46
pH 0 – 14.00

- 13 -
Note: calibration indication icons are example of USA series.
Calibration information display
1. Automatically display electrode slope in
measurement interface
•Display average slope after two- or three-point
calibration
•Dose not display slope after one point calibration
2. Display last calibration data in pH submenu clause
1.3
Calibration intervals
Calibration intervals depend on the sample, the probe performance, and the required accuracy. For
high ccuracy measurements (≤ ±0.02pH), the meter should be calibrated before taking a
measurement. For general accuracy (≥±0.1pH), after one time calibration, the meter can be used for
approximately one week or longer.
The meter must be recalibrated in the following situations:
(a) New probe or probe that is unused for a long period of time
(b) After measuring acids solution (pH<2) or alkaline solutions (pH>12)
(c) After measuring solution that contains fluoride or strong organic solution
(d) If the solution’s temperature differs greatly from that of the calibration solution
pH meter calibration (take three-point calibration as an example)
Long press key to enter calibration mode, as
shown in left graph. Rinse pH probe in pure water,
allow it to dry by shaking or filter paper. Press
key to confirm.
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- 14 -
Submerge probe in pH7.00 buffer solution. Stir the
solution briefly and allow it to stay in the buffer
solution until appears. Press key to
make calibration.
Rinse pH probe in pure water, allow it to dry by
shaking or filter paper. Press key to confirm.
If only need one point calibration, press key
to return to measurement mode.
Submerge probe in pH4.00 buffer solution. Stir the
solution briefly and allow it to stay in the buffer
solution until appears. Press key to
make calibration.
Rinse pH probe in pure water, allow it to dry by
shaking or filter paper. Press key to confirm.
If only need two point calibration, press key
to return to measurement mode.
Submerge probe in pH10.01 buffer solution. Stir the
solution briefly and allow it to stay in the buffer
solution until appears. Press key to
make calibration.
Calibration completed, instrument goes back to
measurement mode.
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- 15 -
Custom-defined calibration (take 2.00pH and 7.30pH calibration solution as example)
1. Select User in parameter set 1.1, press key
to return to measurement mode.
2. Long press key to enter calibration mode, as
shown in left graph. Rinse pH probe in pure water,
allow it to dry by shaking or filter paper. Press
key to confirm.
3. Submerge probe in pH2.00 buffer solution. Stir the
solution briefly and allow it to stay in the buffer
solution until appears. Press or
key to adjust measuring value to 2.00pH. Press
key to make calibration.
4. Rinse pH probe in pure water, allow it to dry by
shaking or filter paper. Press key to
confirm. If only need one point calibration, press
key to return to measurement mode.
5. Submerge probe in pH7.30 buffer solution. Stir the
solution briefly and allow it to stay in the buffer
solution until appears. Press or
key to adjust measuring value to 7.30pH.
Press key to make calibration.
6. Calibration completed, instrument goes back to
measurement mode.
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- 16 -
Notes:
(a) The meter can perform 1-2 point custom-defined calibration. When the 1st point calibration is
done, press key, the meter exits from calibration mode. This is one-point custom-defined
calibration.
(b) The meter does not have the function to recognize custom-defined calibration solution. But it
requires the error of custom-defined calibration solution ≤1pH, the differential between two
calibration solution ≥1pH, otherwise the meter will display self-diagnostic error.
(c) The pH value of custom-defined solution is a value in a certain fixed temperature. The meter has
to perform calibration and measurement at the same temperature to avoid big error.
(d) In manual temperature compensation mode, the temperature value should be adjusted before
making calibration. It can not be adjusted during calibrating
process.
Self-diagnostic Information
During the process of calibration and measurement, the meterhas
self-diagnosis functions, and will indicate the relative information,
see chart – 4. Diagram- 9 is the display interface of self-diagnostic
information.
Chart -4 Self-diagnostic information of pH measurement mode
Self-diagnostic
information
Description
Check up
buffer error
Wrong pH buffer solution or
exceed the recognition range
of the meters
1. Check if the pH buffer solution is correct.
2. Check if the connection between meter
and probe is good
3. Check if the probe is failed
no stable
Press key when
measuring value is not stable.
Press when icon appears
electrode error
The measuring value is not
stable for long time (≥3min)
1.Check the probe bulb and make sure there
is no air bulb in it
2.Replace the pH probe with a new one
Note: “electrode error” also includes the situation of electrode aging.
Solution measurement
Rinse pH probe in pure water, allow it to dry, and submerge it in tested solution. Stir the
solution briefly and allow it to stay in the tested solution until icon appears on LCD and a
stable reading is reached. The reading is the pH value of tested solution. Diagram–10 is the
calibration and measurement process of pH meter.
Diagram-9

- 17 -
pH isothermal measurement principle
The closer the temperature of the sample solution to the calibration solution, the more accurate
readings will be. Please be aware of this principle.
Restore to factory default setting
Instrument has factory default setting function, pleasrefer to
parameter setting clause 1.4 (see Diagram-11). With this
function, all calibration data is deleted and the meter will be
calibrated to the theory value (pH valueof zero electric
potential is 7.00, the slope is 100%). Some function settings
restore to the original value (refer to clause 7.2). When
calibration or measurement fails, please restore the meter to
factory default setting and then perform re-calibration or
measurement. Please note all the data deleted will not be retrievable if the meter is restored to
factory default setting.
6. MV MEASUREMENT
ORP measurement
Press key and switch the meter to mV measurement mode. Connect ORP probe (need to
purchase it separately) and dip it in sample solution, stir the solution briefly and allow it to stay in the
solution until icon appears. Thereading obtained is ORP value.ORP stands for Oxidation
Reduction Potential. It means oxidation reduction potential of solution. ORP is the measurement
Diagram-10
Diagram-11
Prsse
key to turn
on the meter
Press
key to enter
calibration
mode
Submerge the probe in
pH7.00 solution, press
key when
icon appears.
3 r d point calibration
completed, meter
auto. enters into
measurement mode.
Solution
Measure
men
2nd point
calibration
1 st point
calibration
3 r d point
calibration
Submerge the probe in
pH4.00 solution, press
key when
icon appears.
Submerge the probe in
pH10.01 solution, press
key when
icon appears.
1st point calibration
completed, press
key to enter into
measurement mode.
2nd point calibration
completed, press
key to enter into
measurement mode.