APERA PC950 Benchtop pH/Conductivity Meter Kit Instruction Manual

June 3, 2024
APERA

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.

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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

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