APERA PC950 Benchtop pH/Conductivity Meter Kit Instruction Manual
- June 3, 2024
- APERA
Table of Contents
PC950 Benchtop pH/Conductivity Meter Kit
PC950 Benchtop pH/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 –
1.1 Measurement parameter………………………………………………………………………………………. – 1 1.2 Basic
features …………………………………………………………………………………………………….. – 1 1.3 pH measurement
features ……………………………………………………………………………………. – 1 1.4 Conductivity measurement
features……………………………………………………………………….. – 1 2 Specifications
………………………………………………………………………………………………………………. – 2 –
2.1 Technical parameters…………………………………………………………………………………………… – 2 2.2 Other
technical parameters…………………………………………………………………………………… – 2 3 Instrument
Description…………………………………………………………………………………………………… – 3 –
3.1 LCD display ……………………………………………………………………………………………………….. – 3 3.2 Keypad
functions ………………………………………………………………………………………………… – 4 3.3 Meter sockets
…………………………………………………………………………………………………….. – 5 3.4 Display mode
……………………………………………………………………………………………………… – 5 3.5 Data storage, recall and
delete ……………………………………………………………………………… – 6 3.6 Manual adjust temperature
…………………………………………………………………………………… – 7 3.7 Install meter with multi-function
test bench………………………………………………………………. – 7 3.8 Installation of flexible electrode
holder ……………………………………………………………………. – 7 3.9 Use forms of mulit-function test
bench ……………………………………………………………………. – 7 4 pH measurement
………………………………………………………………………………………………………….. – 8 –
4.1 pH calibration related information ………………………………………………………………………….. – 8 4.2
pH meter calibration (take three-point calibration as an example)
……………………………….. – 9 4.3 Custom-defined calibration (take 2.00pH and 7.30pH
calibration solution as example)…. – 10 4.4 Self-diagnostic
Information………………………………………………………………………………….. – 12 4.5 Solution measurement
……………………………………………………………………………………….. – 12 4.6 pH probe
maintenance……………………………………………………………………………………….. – 13 5 mV measurement
……………………………………………………………………………………………………….. – 13 –
5.1 ORP measurement ……………………………………………………………………………………………. – 13 5.2 Notes for
ORP measurement ………………………………………………………………………………. – 14 5.3 Ion potential
measurement………………………………………………………………………………….. – 14 6 Conductivity Measurement
…………………………………………………………………………………………… – 14 –
6.1 Conductivity probe information…………………………………………………………………………….. – 14 6.2
Conductivity calibration related information ……………………………………………………………. – 15 6.3
Conductivity meter calibration (take 1413S/cm calibration as an example)
……………….. – 16 6.4 Custom-defined calibration (take 10S/cm standard solution as
an example)……………… – 16 6.5 Self-diagnostic
information………………………………………………………………………………….. – 17 6.6 Solution measurement
……………………………………………………………………………………….. – 18 6.7 Conductivity probe maintenance
………………………………………………………………………….. – 19 7 Parameter setting
……………………………………………………………………………………………………….. – 20 –
7.1 Main menu and submenu …………………………………………………………………………………… – 20 7.2
Operation…………………………………………………………………………………………………………. – 20 7.3 Content of
parameter setting……………………………………………………………………………….. – 21 8 Stirrer
……………………………………………………………………………………………………………………….. – 21 –
8.1 Operation…………………………………………………………………………………………………………. – 21 8.2 Specification
…………………………………………………………………………………………………….. – 22 8.3 Notes
………………………………………………………………………………………………………………. – 22 9 Warranty
……………………………………………………………………………………………………………………. – 22 10 Meter Kits
………………………………………………………………………………………………………………….. – 23 –
1 INTRODUCTION
Thank you for purchasing our PC950 Benchtop pH/Conductivity Meter. Before
using this meter, please read the operation manual carefully in order to help
use and maintain it correctly. On the basis of improving instrument of
performance constantly, we reserve the right of changing the content of this
manual and accessories in case of not notifying in advance. This meter is a
perfect combination with advanced electronic technology, sensor technology and
software design, and is the most cost effective benchtop meter which is
suitable for pH and conductivity measurement of water solution in laboratory.
1.1 Measurement parameter Measurement parameter pH/mV Cond./TDS/Salinity Temperature
PH950
EC950
PC950
1.2 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 & Chinese) 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. 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.
1.3 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.
1.4 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.
– 1 –
2 SPECIFICATIONS
2.1 Technical parameters
Measuring Range
Resolution
pH
Accuracy
Temperature Compensation Range
Calibration point
Measuring Range
mV
Resolution
Accuracy
Technical Parameters 0.00 ~ 14.00pH 0.1/0.01 pH ±0.01 pH ±1 digit
0 ~ 100°CAuto. or Manual
1~3 points ±2000mV
1mV ±0.1% FS ±1 digit
Cond. Temp.
Measuring Range
Conductivity0~200 mS/cm, divided into five
ranges, automatically switch measuring range. 0~19.99S/cm; 20.0~199.9S/cm;
200~1999S/cm;2.00~19.99mS/cm; 20.0~199.9mS/cm TDS(0 ~ 100) g/L Salinity(0 ~
100) ppt
Resolution Accuracy Temperature Compensation Range Cell constant Measuring Range Resolution Accuracy
0.01/0.1/1S/cm 0.01/0.1 mS/cm ±1.0% FS ±1 digit
0 ~ 50°CAuto. or Manual
0.1 / 1 / 10 cm-1 0~100 0.1°C
±0.5°C±1 digit
Model
PH950 PC950
EC950 PC950
PH950 EC950 PC950
2.2 Other technical parameters
Data Storage
PH950, EC950: 100 groups; PC950: 200 groups
Storage Content
Number, measuring value and temperature value
Power
DC9V/600mA
Dimension & Weight
Meter(360×235×100 )mm / 1.7kg
– 2 –
3 INSTRUMENT DESCRIPTION 3.1 LCD display
pH measurement interface
Conductivity measurement interface
TDS measurement interface
–pH measurment –pH measuring value –Temperature measuring value –pH electrode
slope –Calibration solution indication icon –Stirrer icon –Temperature
compensation icon,
MTC-manual temperature compensation ATC-auto. temperature compensation –Auto.
lock on icon –Stable reading icon –Storage icon and number
–Conductivity measurement –Conductivity parameter
1.0–conductivity cell constant 25.0–reference temperature 2.00%–temperature
compensation
coefficient –Calibration solution indication icon
Salinity measurement interface
–TDS measurement –TDS factor 0.71
pH/Cond. measurement interface
–Salinity measurment –Salinity factor 0.5
mV measurement interface
– 3 –
3.2 Keypad functions
Keypad operation mode:
Diagram-1
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.
Chart -1 Keypad operations and functions
Keypad Operations
Functions
Short press Power supply switch
Short press
Press key to select measurement mode: PH950: pHmV EC950: CondTDSSalt PC950: pHmVCondTDSSaltpH/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 Short press
Cancel operation and return to measurement mode;
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.
In measurement mode: press
key to store measuring value,
press
key to recall;
Short press
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.
– 4 –
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.
3.3 Meter sockets
Model
Meter Sockets
PH950
EC950
PC950
Diagram-2
— BNC socket, connect with pH combination electrode and ORP combination
electrode. — RCA socket, connect with temperature sensor (for pH measurement).
+–BNC+RCA socket, connect with pH/ATC 3-in-1 combination electrode. — 4 banana
socket, connect with reference electrode. — BNC socket, connect with
conductivity cell. — RCA socket, connect with temperature sensor (for
conductivity measurement). +– BNC+RCA socket, connect with Cond/ATC cell. —
2.5 power socket (inside “” outside “”) connect with DC9V adapter.
— 2 power socket, conntect with stirrer.
3.4 Display mode
3.4.1 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. 3.4.2 Auto. lock on display mode
Diagram-3
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.
– 5 –
(a)
(b)
Diagram-4
3.5 Data storage, recall and delete
3.5.1 Storage
Press
key to store, icon
displays on the top right corner of LCD screen, which means it’s
the 12th group data, see Diagram 5(a); Each meter can store 100 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 number corresponds to 2 groups measuring value (pH
+ conductivity). So for this type of meter, actual store data is 100 groups, but storage number will be less
than 100. If press
key again when storage value is full, icon
will flicker, see Diagram
5(c) to indicate store memory is already full and need to be deleted for new store value. 3.5.2 Recall
Press
key, meter will display stored 12 groups measuring value, see Diagram 5(b), press
or
key to turn page. Every page displays 8 groups data.
3.5.3 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.
a
b
Diagram-5
c
– 6 –
d
3.6 Manual 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 return to measurement mode.
key to confirm and
3.7 Install meter with multi-function test bench
Before installing
Mulit-function test bench
Meter
After installing
Stirrer connection cable
Connection bar Diagram-6
3.8 Installation of flexible electrode holder
Aim hole to shaft and press down
Diagram-7
3.9 Use forms of mulit-function test bench
(a) Siamesed using
(b) Separation using (maximum distance 35cm) Diagram-8
– 7 –
4 PH MEASUREMENT
4.1 pH calibration related information 4.1.1 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
4.00pH 7.00 pH 10.01 pH
4.01 pH 6.86 pH 9.18 pH
4.00 pH 6.86 pH 9.18 pH
Note: calibration indication icons are example of USA series.
4.1.2 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.
Chart -3 Three-point calibration mode
USA standard NIST standard
CH standard
Calibration
Applicable
indication icons
range
One-point calibration
7.00 pH
6.86 pH
6.86 pH
Accuracy ±0.1pH
Two-point calibration
7.00 pH and 4.00pH
7.00 pH and 10.01pH
6.86 pH and 4.01pH
6.86 pH and 9.18pH
6.86 pH and 4.00pH
6.86 pH and 9.18pH
<7.00 pH >7.00 pH
Three-point 7.00pH, 4.00pH 6.86pH, 4.01pH 6.86pH, 4.00pH
calibration and 10.01 pH
and 9.18 pH
and 9.18 pH
0~14.00pH
Note: calibration indication icons are example of USA series.
– 8 –
4.1.3 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
4.1.4 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
4.2 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.
Submerge probe in pH7.00 buffer solution. Stir the solution briefly and allow it to stay in the buffer solution
until
appears. Press
calibration.
key to make
– 9 –
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 to measurement mode.
key to return
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 to measurement mode.
key to return
Submerge probe in pH10.01 buffer solution. Stir the solution briefly and allow it to stay in the buffer solution
until
appears. Press
calibration.
key to make
Calibration completed, instrument goes back to measurement mode.
4.3 Custom-defined calibration (take 2.00pH and 7.30pH calibration solution as example)
1. Select User in parameter set 1.1, press return to measurement mode.
key to
– 10 –
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 confirm.
key to
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.
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.
– 11 –
(d) In manual temperature compensation mode, the temperature value should be adjusted before making calibration. It can not be adjusted during calibrating process.
4.4 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.
Diagram-9
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 electrode error
Press
key when measuring
value is not stable.
The measuring value is not stable for long time (3min)
Press
when
icon appears
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.
4.5 Solution measurement 4.5.1 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. Diagram10 is the calibration and measurement
process of pH meter.
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.
1st point calibration completed, press
key to enter into
measurement mode.
1 st point calibration
Submerge the probe in pH4.00 solution, press
key when icon appears.
2nd point calibration completed, press
key to enter into measurement mode.
2nd point calibration
Solution Measure
men
Submerge the probe in pH10.01 solution, press
key when icon appears.
3rdpoint calibration completed, meter auto. enters into measurement mode.
3 rd point calibration
Diagram-10 – 12 –
4.5.2 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.
4.5.3 Restore to factory default setting
Instrument has 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
Diagram-11
note all the data deleted will not be retrievable if the meter is restored to factory default setting.
4.6 pH probe maintenance 4.6.1 Daily maintenance There is right amount 3M KCl
solution in protection bottle of electrode front-end. Electrode tip is soaked
inside it to keep glass bulb and junction activated. When measuring, unscrew
the cap and pull out electrode. Rinse off with pure water and it can be used.
After using, insert the electrode and screw bottle cap to avoid solution
leakage. If find muddy, signs of mould in the solution of protection bottle,
the bottle hould be washed in time and replace new soaking solution. 3M KCl
solution preparation: take 22.4g KCl reagent and dissolve it in 100ml pure
water. The probe should not be soaked in pure water, protein solution or acid
fluoride solution for long periods of time. In addition, do not soak the probe
in organic grease lipids. For best accuracy, always keep the meter, especially
the connectors of the meter and probe clean and dry. If polluted, clean it
with medical cotton and absolute alcohol, then allow it dry. 4.6.2 Buffer
solution
The instrument was demarcated by buffer solution which has known pH value. For
better measurement accuracy, the buffer solution used should be fresh. The
buffer solution should be replaced after frequent usage. 4.6.3 Clean The probe
should be thoroughly cleaned after testing in sticky samples, to remove the
sampes cling to glass membrane. Or wash the probe with proper solvent, then
scour off the solvent with pure water.
5 MV MEASUREMENT
5.1 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
– 13 –
Potential. It means oxidation reduction potential of solution. ORP is the
measurement index for the oxidation reduction ability of wate solution. Its
unit is mV.
5.2 Notes for ORP measurement 5.2.1 ORP measurement does not require
calibration. When the user is not sure about ORP probe quality or measuring
value, use ORP standard solution to test mV value and see whether ORP probe or
meter works properly. 5.2.2 Clean and activate ORP probe: After the probe has
been used over long period of time, the platinum surface of the ORP probe will
get polluted which causes inaccurate measurement and slow response. Please
refer to the following methods to clean and activate ORP probe: (a) For
inorganic pollutant, submerge the probe in 0.1mol/L dilute hydrochloric acid
for 30 minutes, wash
it in pure water, and then submerge it in electrode soaking solution for 6
hours. (b) For organic or lipid pollutant, clean the platinum surface with
detergent, then wash it in pure water,
then submerge it in electrode soaking solution for 6 hours. (c) For heavily
polluted platinum surface on which oxidation film is formed, polish the
platinum surface
with toothpaste, then wash it in pure water, then submerge it in electrode
soaking solution for 6 hours.
5.3 Ion potential measurement Connect ion probe and dip it in sample solution,
stir the solution briefly and allow it to stay in the solution
until icon appears. The reading obtained is potential value of ion probe. If
ion probe is combination type, only need to insert it into “pH/mV” socket. If
it’s not combination type, proper reference electrode should be selected and
insert it to “REF” socket. Two probles should be make measurement at same
time.
6 CONDUCTIVITY MEASUREMENT
6.1 Conductivity probe information 6.1.1 Matching conductivity probe The meter
includes one plastic conductivity probe (Model 2401T-F, K=1.0). With built-in
temperature sensor, the meter can realize automatic temperature compensation.
BNC plug of the probe is connected to the meter’s conductivity socket while
RCA plug is connected to the Temp socket. When the probe is submerged in
solution, stir the solution briefly to eliminate the air bubbles and in this
way, a stable measurement will be reached fast. 6.1.2 Conductivity probe
constant The meter can use with conductivity probes with three constants
(K=0.1, K=1.0 and K=10.0). Please refer to chart-5 for the measuring range.
Instrument constant can be set in parameter setting clause 2.1.
Chart -5 Probe constant and measuring range
Measuring Range 20 S/cm
0.5S/cm~100mS/cm
100mS/cm
Conductivity probe constant
Standard solution
K=0.1 cm-1 84S/cm
84S/cm
K=1.0 cm-1 1413 S/cm 12.88 mS/cm
K=10 cm-1 111.8 mS/cm
– 14 –
6.2 Conductivity calibration related information
6.2.1 Conductivity calibration solutions
The meter uses Standard series and CH series conductivity solution. The meter can recognize the
standard solution automatically and perform 1~4 point calibration. The calibration icons at the bottom left
of LCD screen is corresponding to four built-in standard values. See chart 6.
Chart -6 Conductivity standard solution series
Icons
Standard calibration solution
CH conductivity solution
84 S/cm
146.6S/cm
1413 S/cm
1408S/cm
12.88 mS/cm
12.85mS/cm
111.8 mS/cm
111.3mS/cm
Note: calibration indication icons are example of Standard series. 6.2.2
Calibration intervals (a) The meter is calibrated before leaving the factory
and can generally be used right out of the box. (b) Normally, performing
calibration once a month is recommended. (c) For high accuracy measurement or
larger temperature deviation from the reference temperature
(25°C), performing calibration once a week is recommended. (d) Use
conductivity standard solution to check the probe. Perform calibration if the
error is big. (e) When use a new probe for the first time, or the meter has
restored to factory default setting, 3-point
or 4-point calibration is recommended. For everyday use, standard solution
closer to the sample solution can be chosen to perform 1- point or 2-point
calibration. For example: 1413 S/cm standard solution is suitable for
measuring range 0-20mS/cm. 6.2.3 Reference temperature Factory set reference
temperature is 25°C. Other reference temperature can also be set within the
range 15°C~30°C. Set up reference temperature in parameter setting clause 2.4
6.2.4 Temperature coefficient Factory set temperature compensation coefficient
of the meter is 2.0%. However, the conductivity temperature coefficient is
different from that of varous kinds of solution and concentration. Please
refer to chart 7 and the data collected during testing and set up the
parameter in clause 2.5. Note: When the temperature compensation coefficient
is set to 0.00 , meaning no temperature compensation, the measurment value
will be based on the current temperature.
Chart -7 Temperature compensation coefficient of certain solutions
NaCl solution
Solution
Temperature compensation coefficient 2.12 %/
5% NaOH solution Dilute ammonia solution
1.72 %/ 1.88 %/
10% hydrochloric acid solution
1.32 %/
5% sulfuric acid solution
0.96 %/
– 15 –
6.2.5 Avoid contamination of standard solution Conductivity standard solution
has no buffer. Please avoid being contaminated during usage. Before submerging
the probe in standard solution, please wash the probe and allow it dry. Please
do not use the same cup of conductivity standard solution frequently,
especially for standard solution of low concentration 84S/cm. The contaminated
standard solution will affect accuracy of measurements.
6.3 Conductivity meter calibration (take 1413S/cm calibration as an example)
1. 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 confirm.
key to
2. Submerge probe in 1413S/cm solution. Stir the solution briefly and allow it to stay in the buffer
solution until
appears. Press
make calibration.
key to
3. Calibration completed, instrument goes back to measurement mode.
For mulit-point calibration, please repeat above 1~3 step until all the calibration is done. The meter can perform calibration in same calibration solution until the value displayed is stable and repeatable.
To quit calibration mode, please
key, meter will return to measurement mode.
Press
key to switch measurement mode CondTDSSalt.
6.4 Custom-defined calibration (take 10S/cm standard solution as an example)
1. Select User in parameter setting clause 2.2, press key to return to measurement mode.
– 16 –
2. Long press
key to enter calibration mode, as
shown in left graph. Rinse probe in pure water, allow it
to dry by shaking or filter paper. Press confirm.
key to
3. Submerge probe in 10S/cm standard solution. Stir the solution briefly and allow it to stay in the buffer
solution until
appears. Press
or
key to adjust measuring value to10.00S/cm. Press
key to make calibration.
Calibration completed, instrument goes back to measurement mode.
Only 1-point calibration for custom-defined calibration. The conductivity
value of custom-defined solution is avalue in a certain fixed
temperature.There is no regulation of temperature coefficient and reference
temperature. The meter has to perform calibration and measurement at the same
temperature to avoid large error.
The meter does not have the function to recognize custom-defined calibration
solution. In manual temperature compensation mode, the temperature value
should be adjusted before
making calibration. It can not be adjusted during calibrating process.
6.5 Self-diagnostic information During the process of calibration, the meter
has self-diagnosis functions, and will indicate the relative information see
chart 8. Diagram-12 is the display interface of self-diagnostic information.
Diagram-12
– 17 –
Chart -8 Self-diagnostic information of conductivity measurement mode
Self-diagnostic information
Description
Check up
buffer error
Wrong conductivity calibration solution or exceed recognition range of the meter
1. Check if conductivity 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.Shake the probe to eliminate bubbles in probe head.
2.Replace conductivity probe with a new one
6.6 Solution measurement
6.6.1 Rinse conductivity probe in pure water, allow it to dry, and submerge it
in the sample solution. Stir
the solution briefly and allow it to stay in the sample solution until a
stable reading is reached and icon appears on LCD screen. The reading got is
the conductivity value of the solution. Diagram 13 is the calibration and
measurement process of conductivity.
Press key to turn on the meter
Press
key to
enter calibration
mode
Press
key
to enter calibration mode
Press
key
to enter
calibration mode
Press
key
to enter
calibration mode
Submerge the probe in 84S
1 st point
solution, press
key when calibration
icon appears 1st point kalibration
completed, meter enters
measurement mode automatically.
Submerge the probe in 1413S
2nd point
solution, press
key when calibration
icon appears 2nd point kalibration completed, meter enters measurement mode automatically.
Solution Measurement
Submerge the probe in 12.88mS 3rdpoint
solution, press
key when calibration
icon appears 3rd point kalibration
completed, meter enters
measurement mode automatically.
Submerge the probe in 111.8mS
solution, press
key when
icon appears 4th point kalibration completed, meter enters measurement mode automatically.
4th point calibration
Diagram-13
– 18 –
6.6.2 Relationship among TDS, salinity and conductivity The conversion coefficient between TDS and conductivity is 0.40~1.00 which can be adjusted in parameter setting clause 2.6 Factory default setting is 0.71. The conversion coefficient between salinity and conductivity is 0.5. So the meter only needs to be calibrated in conductivity mode, then switch to TDS and salinity mode. Customers can adjust TDS conversion coefficient in parameter setting clause 2.6 according to testing data and experience. Please refer to chart-9 for some frequently-used conductivity and TDS conversion coefficients. Just for your reference.
Chart -9 Conversion coefficient between conductivity and TDS
Conductivity of solution
TDS conversion coefficient
0~100 S/cm
0.60
100~1000 S/cm
0.71
1~10 mS/cm
0.81
10~100 mS/cm
0.94
6.6.3 Restore to factory default setting Instrument has has factory default setting function,please refer to parameter setting clause 2.7 (see Diagram-14).With this function, all calibration data is deleted and the meter will be calibrated to the theory value. Some function settings restoreto the original value (refer to clause 2.7). When calibration or measurement fails, please restore the meter to factory default setting and then perform recalibration or measurement. Please note all the data deleted will not be retrievable if the meter is restored to factory default setting.
Diagram-14
6.7 Conductivity probe maintenance 6.7.1 Always keep the conductivity probe
clean. Before taking a measurement, rinse the probe in pure water and allow it
dry, then rinse it in the sample solution. When submerge the probe in
solution, stir the solution briefly to eliminate air bubbles and allow it to
stay in the solution until a stable reading is reached.
6.7.2 The sensitive rod of Model 2401T-F conductivity probe is coated with
platinum black to minimize probe polarization and expand measuring range. The
platinum black coating of the probe adopts advanced electroplating technology.
This not only increases the surface roughness, but also improves probe
measurement performance. And the coating is tight and firm, it can be washed
by soft brush. This increases the the service life of probe a lot.
– 19 –
7 PARAMETER SETTING
7.1 Main menu and submenu Main menu
pH submenu
Conductivity/TDS submenu
Setting submenu
Diagram-15
7.2 Operation
Press
key to open main menupress
or
key to select main menu itemspress
key to open main menu item (submenu)press
or
key to select submenu
items(parameter) press
key to open parameterpress
or
key to select
parameter items or parameter valuepress
key to confirmpress
measurement mode. Please follow the operating indication in the bottom of LCD screen when operate it.
key to return to
– 20 –
7.3 Content of parameter setting
Main menu
Serial number
Parameter setting items
Setting content
Factory default
1.1
1.0
1.2
pH
1.3
1.4
2.1
2.2
2.3
2.0 Cond./TDS
2.4
2.5
2.6
2.7
3.1
3.0
3.2
Configuration
3.3
3.4
pH buffer selection Resolution
The last calibration data Restore factory default
Cell constant CAL solution selection The last calibration data Reference
temperature Temp compensation factor
TDS factor Restore factory default
Reading with HOLD Temperature unit Delete saved data
Language selection
CH-USA-NIST-User 0.01-0.1 View No-Yes 10-1.0-0.1
CH-Standard-User View
15~30 0.00~10.00%
0.40~1.00 No-Yes On-Off °C – °F Yes/No
-English-Deutsch
USA 0.01
/ No 1.0 Standard / 25 2.0% 0.71 No / / / /
8 STIRRER
8.1 Operation 8.1.1 Insert two ends of stirrer connection cable to the socket of meter and stirrer.
8.1.2 Press
key to turn on,
icon appears in the bottom right corner of LCD screen. At this time
the rotating speed is zero. Press
or
key to increase or decrease rotating speed. Press and
hold key for fast changing.
8.1.3
key operation: long press
key for 3 seconds to store rotating speed. At this time stirrer
icon turns to , then press
and
key to change rotating speed. The icon turns to , When
using stirrer, press
key to switch
and
two kinds of rotating speed. When using
– 21 –
— Show this icon when turn on meter, it also indicates the adjusted rotating speed.
— It indicates the stored rotating speed.
8.1.4 For required rotating speed, press key to stir with this speed.
key to store. Next time turn on meter and press
8.2 Specification Speed adjustable range Working surface diameter Maximum stir capacity
0 ~ 2300 revolution per minute (no-load) 100mm 1000ml
8.3 Notes 8.3.1 If the bottom plane of beaker is not smooth, it will cause vibration when stirring, even unable to stir. In this case, please replace a qualified beaker.
8.3.2 At zero rotating speed, please don’t long press
key, otherwise zero rotating speed will be
stored. In this case, please press
key to store once more.
9 WARRANTY
We warrant this instrument to be free from defects in material and workmanship
and agree to repair or replace free of charge, at option of APERA
INSTRUMENTS(Europe) GmbH, any malfunctioned or damaged product attributable to
responsibility of APERA INSTRUMENTS(Europe) GmbH for a period of THREE YEARS
(SIX MONTHS for the probe) from the delivery.
This limited warranty does not cover any damages due to: Transportation,
storage, improper use, failure to follow the product instructions or to
perform any preventive maintenance, modifications, combination or use with any
products, materials, processes, systems or other matter not provided or
authorized in writing by us, unauthorized repair, normal wear and tear, or
external causes such as accidents, abuse, or other actions or events beyond
our reasonable control.
– 22 –
10 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 stirrer(includes flexible electrode holder) 1
5 LabSen211 glass pH combination electrode
1
6 MP500 temperature probe
1
7 2401T-F conductivity probeATC,K=1.0
8 pH buffer solution (4.00/7.00/10.01pH/50mL
9
Conductivity standard solution (84S/1413S/12.85mS/50mL)
10 Stirrer connection cable
1
1 bottle
each
1 bottle each
1
11 9V power adapter
1
12 Small round bottle
3pcs 3pcs 6pcs
13 L200 stirrer bead
3pcs 3pcs 6pcs
14 Instruction manual
1
15 Quick manual
1
Apera Instruments, LLC (U.S.A) Add: 6656 Busch Blvd, Columbus Ohio 43229 Tel: +1 614-285-380 Email: info@aperainst.com Website: www.aperainst.com
Apera Instruments (Europe) GmbH Wilhelm-Muthmann-Straße. 18 42329 Wuppertal Germany Tel: +49(0)202 51988998 Email: info@aperainst.de Website: www.aperainst.de
Shanghai Apera Instruments Co; Ltd. (China) Add: 481 Guiping Rd Building #16, 4F, Shanghai China Tel: +86-21-63362480 Email: wxmab@shsan-xin.com
– 23 –
References
- Apera Instruments® Meters and Sensors for pH, Conductivity, TDS, Salinity, ORP, DO, Turbidity, ISE
- Apera Instruments® Meters and Sensors for pH, Conductivity, TDS, Salinity, ORP, DO, Turbidity, ISE
- Apera Instruments
- Apera Instruments
- 优信二手车
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