MRC INE-ZD-2 Bedienungsanleitung

INE-ZD-2

Automatic potential titrator

Instruction Manual

PLEASE READ THIS MANUAL CAREFULLYBEFORE OPERATION

3, Hagavish st. Israel 58817 Tel: 972 3 5595252, Fax: 972 35594529 [email protected]

MRC. 3.21

INE-ZD-2 Automatic Potential Titartor

Please read this INSTRUCTION carefully before using the instrument.

The instrument must be sent to metrological service or other departments that are

qualified to check for checking after being used for one year, and only those qualified

ones can be used again.

The expiration date of electrode is one year. Its performance will be affected one

year after its delivery regardless of whether using or not. Should be replaced

immediately .

Warning - when using dangerous chemicals, please read the chemical MSDS and use

protection measures before operating a titrator.

Warning - Attention should be paid to protection, when doing titration test,

especially the analysis of strong alkali, strong acid and perchloric acid corrosive

solution. It is best to take the mask and gloves, in case the harm of solution to human

body.

INE-ZD-2 Automatic Potential Titartor

CONTENT

1. Introduction

2. Specifications and Perfermance

3. Structure

4. Operation

5. Application example

6. Notice

7. Troubleshooting

8. Appendix

INE-ZD-2 Automatic Potential Titartor

1 Introduction

1.1 Application

INE-ZD-2 Automatic potential titrator can be used to complete different potential titration. It is widely used in

scientific research, education, chemical industry and environmental protection.

1.2 Characteristic

1) Volumetric analysis by potential titration in laboratory;

2) pH value or electric potential controlled titration;

3) Volumetric analysis by manual;

4) Measure pH value of sample solution in laboratory;

5) Measure electric potential of electrodes

2 Specifications and Performance

1) Measuring range: pH: (0~14.00)pH; mV: (0~±1400)mV

2) Resolution: pH: 0.01pH; mV: 1mV

3) The accuracy of electronic unit: pH: ±0.03pH±1 bit; mV: ±5mV

4) pH measuring accuracy: ±0.06pH

5) Electronic unit input current: 2×10-12A

6) Electronic unit input impedance: ≥3×1011Ω

7) Repeatability of volumetric analysis: 0.2％

8) Sensitivity of titration control: pH:±0.1pH; mV:±5mV

9) Endpoint setup range: (0~±1400)mV or (0~14.00)pH

10) Stability of electronic unit: ±0.01pH/3h

11) Normal working conditions of meter

a) Ambient temperature: (5~40)℃;

b) Relative humidity: ≤85%;

c) Power supply: AC(220±22)V，Frequency(50±0.5)Hz;

d) There is no corrosive air nearby;

e) There is no vibration nearby;

f) There is no magnetic interference except earth magnetic influence.

INE-ZD-2 Automatic Potential Titartor

3 Structure

3.1 Front view of the meter

The front panel of meter is shown as above. The display screen is 240X128 Graphics dot matrix LCD. There are 20

keys on the panel, 9 of which are double-function keys. The key function is shown as follows：

‘Start’: Start titration;

‘Exit’: Finish titration and begin measuring;

‘pH/mV’: Choose pH and mV measurement or titration. Pressing this key can switch two working

modes. Make sure pH or mV status before setting “Ep” and “Pp”;

‘Ep’: Set end point potential or pH value;

‘Pp’: It can set presetting electronic potential or pH value, which depend on the properties of

chemical reaction, that is the volume of titrating jump. General oxidation reduction titration, strong

acid strong alkali neutralization titration and precipitation titration may select smaller presetting

value. Weak acid strong alkali, strong acid weak alkali may select middle presetting value; and weak

acid weak alkali titration need select large presetting value;

‘Delay’: It can set delay time between titration endpoint and stopping titration. Since the chemical

reaction needs some time, when the titrator finds the endpoint potential or pH value, the potential

and pH readings will become unstable after turning off the solenoid valve, so you’d better not stop

titration when meter just found endpoint potential or pH value. The best method is to delay for some

INE-ZD-2 Automatic Potential Titartor

period. If the readings are unstable, you should continue titrating until potential or pH value becomes

stable. The effective range is ‘0~200’ seconds. If you input a number which is larger than 200, titrator

will display XXX and will not terminate titration automatically;

‘1 /Auto’: In the digital input states, the key works as number ‘1’; In measuring mode, it indicates

automatic titration;

‘2 /Print’: In the digital input states, the key works as number ‘2’; In measuring mode, pressing it can

print potential or pH data of last titration. The titrator can store up to 100 data;

‘3 /Temp’: In the digital input states, the key works as number ‘3’; In measuring mode, you can input

current solution temperature by pressing it.;

‘4 /Fast’: In the digital input states, the key works as number ‘4’; In measuring mode, titration speed

is fast;

‘5 /View’: In the digital input states, the key works as number ‘5’; In measuring mode, pressing it can

view potential or pH value in the last titration; it can store up to 100 data.

‘6’：It indicates number ‘6’;

‘7 /Slow’: In the digital input states, the key works as number ‘7’; In measuring mode, titration speed

is slow;

‘8 /▲’: In the digital input states, the key works as number ‘8’; it means page up when viewing

data;

‘9’: It indicate number ‘9’;

‘. /Cont’: In the digital input states, the key indicates decimal point; In measuring mode, pressing it

can turn on the solenoid valve and solution will drop from burette. Release the key and solenoid

valve will turn off immediately;

‘0 /▼’: In the digital input states, it indicates number’0’; it means page down when viewing data;

‘－/Cali’: In the digital input states, it indicates minus sign; In measuring mode, it is calibrating pH

valuue and the lower right corner will display ‘Cali’. During the calibration of the first kind of solution,

when the potential reading is stable, you can press ‘Enter’ key for one-point calibration; You should

press ‘－/Cali’ key instead of ‘Enter’ key if you need two-point calibration. Then the lower right

corner on LCD will display ‘Slope’ and it indicates the calibration of the second kind of solution in two

point calibration. When the potential readings become stable, you just press ‘Enter’ key and the

two-point calibration is finished;

‘Enter’: It indicates the number is already input or operation has finished;

‘Cancel’: It indicates the number input will be cancelled.

INE-ZD-2 Automatic Potential Titartor

3.2 Rear panel of the meter

Power: It indicates AC 220V power supply;

ON/OFF: It indicates power switch;

0.5A: It indicates 0.5A fuse holder;

Valve：It indicates solenoid valve interface, Φ3.5 microphone jacket;

Ref：It indicates reference electrode socket;

Meas：It indicates measuring electrode socket, BNC type;

Print：It indicates DB9 socket, connected with TPuP16 Printer.

3.3 Titration device

Installation of titration device

The titration device is installed on JB-1A stirrer. The installation procedure is listed as follows

(1) Clamp

(2) Electrode pole B

(3) Solenoid valve

(4) Electrode holder

(5) Set screw

(6) Electrode pole A

(7) Base of electrode pole

(8) Supporting seat

INE-ZD-2 Automatic Potential Titartor



Note:

Spin electrode pole A (6) on mounting thread (8), then spin electrode pole B (2) on electrode pole A (6).

Install solenoid valve (3) into the electrode pole, and make sure the direction of arrow on it is down.

Installation of stirrer and titration device

(1) Clamp component (SC5.100.045 with 1 set screw)

(2) Solenoid valve component (SC5.100.045 with 1 set screw )

(3) Electrode holder component (SC5.108.019 with 1 set screw)

(4) Capillary burette (SC8.403.008)

(5) JB-10 stirrer

(6) Electrode pole B (SC8.100.250)

(7) Electrode pole A component (SC8.100.249 with 1 base of electrode pole)

(8) Supporting seat component (SC8.022.106)

Connect the outlet of solenoid valve to capillary burette with silicone rubber tube, then insert

capillary burette into electrode holder.

4 Operation

After installation, connect titrator with power supply. Turn it on and preheat it for 15 minutes.

4.1 mV measurement

(1) Press ‘pH/mV’ key and the upper left corner of LCD will display ‘mV’;

(2) Insert the electrode into sample solution. Stir the solution well and read the mV value;

4.2 pH calibration and measurement

4.2.1 pH calibration

The titrator should be calibrated before pH measurement. Generally, meter should be calibrated once

everyday when it is in continuous use. The procedures are listed as follows:

(1) Measure the temperature of sample solution with thermometer.

(2) Press ‘Temp’ key and input the temperature value to the meter and press ‘Enter’ key.

(3) Press ‘-/Cali’ key and lower right corner of LCD will display ‘Cali’;

(4) Insert the rinsed electrode into buffer solution of pH6.86.

(5) When the potential readings are stable, press ‘Enter’ key to finish if you just need one-point calibration. If

you need two-point calibration, you should press ‘－/Cali’ key instead of ‘Enter’ key. When the lower right

corner of LCD display ‘Slope’, you can calibrate the second solution and continue the following operation.

INE-ZD-2 Automatic Potential Titartor



(6) Rinse the electrode with distilled water and insert the electrode into buffer solution of pH4.00 (or

pH9.18).

(7) When the potential readings are stable, press ‘Enter’ key to finish two-point calibration.

4.2.2 pH measurement

(1) Press ‘pH/mV’ key and upper left corner of LCD will display ‘pH’

(2) Rinse the head of electrode with distilled water and rinse it with sample solution.

(3) Measure the temperature of sample solution with thermometer.

(4) Press ‘Temp’ key and input the temperature value to the titrator and press ‘Enter’ key.

(5) Insert the electrode into the sample solution. Stir the solution well and read the pH value.

4.3 Titration

4.3.1 Preparation before titration

(1) Install the titration device according to 2.3 and put the stir bar into the test cup. Then put the test cup on

JB-10 stirrer.

(2) The selection of electrodes: It depends on chemical reaction during titration.

Redox reaction: you can use platinum electrode, calomel electrode and tungsten electrode;

Neutralization reaction: you can use pH combination electrode, glass electrode and calomel electrode;

Silver salt and halogen reaction: you can use silver electrode and special calomel electrode.

4.3.2 Manual operation of dropping liquid

Press ‘－/Cont’ key and solenoid valve will be turned on, and solution will drop from burette. If you release the

key, the solenoid valve will be turned off immediately.

4.3.3 Automatic Potential Titration

(1) Press ‘pH/mV’ key and the upper left corner of LCD will display ‘mV’.

(2) The setting of endpoint potential: Press ‘Ep’ key and input endpoint value by pressing number key.

(3) The setting of presetting potential: Presetting functions as adjusting titration speed automatically. When

the current potential is larger than presetting potential, the speed of titration will become fast; When the

current potential is smaller than presetting potential, the speed of titration will become slow for

accurately controlling potential endpoint.

(4) Press ‘Pp’ key and input presetting potential by pressing number key. For example, set the endpoint

potential as 500mV and presetting potential as 60mV. If the electrode potential is 800mV, when

measured potential is larger than 560mV, automatic titration becomes fast. When measured potential is

smaller than 560mV, the automatic titration becomes slow. When the electrode potential is 100mV and

the measured potential is smaller than 440mV, automatic titration becomes fast; When measured

potential is larger than 440mV, automatic titration becomes slow.

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