Instrumentation & Operation of Automatic Titrator T70.

1. Auto Titrator: Theory and
Working
Manufacturer: Model No:
Mettler Toledo T70

2. Content
 Objective
 Working Principle
 Scope
 Advantages over Classical Method
 Operation of T70 Model
• Preparation of Equipment
• Calibration
• Settings
• Validation of Equipment

3. Continue
• Run Test Method
• Printing of Test Report
 Fields of Use

4. Objective
The object of this equipment is to perform various
kinds of titrations to determine the concentrations of
unknown analytical samples with the help of a known
titrant.
Titrant: The solution of known concentration
dispensed from burette.

5. Working Principle
The auto titrator works on the principle of
potentiometry i.e. the concentration is measured by the
change in potential of the solution under test.
As the titrant is dispensed from the burette into the
analytical sample, its potential is changed, the sensor
detects this change and gives results in terms of voltage
or pH.

6. Scope
The equipment has a wide scope in performing
number of analysis as given below.
Acid No, Base No, Copper Content, Water Content,
Bromine No, Sulfate Content, m and p value of tap
water, Chloride content in motor oil, HCl content
conductometric, Total hardness of tap water etc.

7. Advantages Over Classical Method
 It is fast.
 It is a very accurate and precise technique.
 Avoid the use of glasswares.
 It doesn’t require the attention as classical method
requires since the test stops automatically as end point is
reached.
 It offers a good price/performance ratio compared to more
sophisticated techniques.

8. Operation of T70 Model
1. Preparation of Equipment:
 Filling of titrant bottles with required titrant of known
concentration, visually checking of Drives, dispensing
tubes, electrodes, titrant bottles etc.
 Running of titrant from the dispensing tubes at least
twice.
 pH electrode, Titration vessel and Titrant bottles should
be cleaned properly before proceeding for the analysis.

9. 2. Calibration
 Physically calibrate all the burettes to ensure whether
these are dispensing the correct volume or not.
 Calibrate the sensor installed, if it is pH sensor then
calibrate it with the pH buffers as per the programmed
method.

10. 3. Settings
 Select the suitable method from the method list
programmed in the device.
 Make modification in the method if required such as
for sample size, stir speed, result unit, titrant
concentration etc.
 We can create a new method or modify an existing
Mettler method as per the requirement of test.

11. 4. Validation of Equipment
 In order to validate the equipment, before starting the
test we can perform an analysis with all the known
solutions.
 If the analyzed result by the instrument matches with
the known result, It means that the equipment is
functioning properly and hence it is validated.

12. 5. Run Test Method
 Choose the appropriate method from the method list.
 Fill the titrant bottles with the required titrant in the
particular test method.
Fix the appropriate sensor as per the method
requirement.
 Enter the value of sample size which we want to take
in the reactor vessel.

13. Continue
 Enter the stir speed for stirring the solution in the
reactor vessel.
 Enter the pre dispensing volume of titrant.
 Tap on the start tag twice in order to start the analysis.
 Notice carefully the titration will stop as soon as the
end point is achieved.

14. Continue
 At the end point we will notice a drastic change in the
pH or potential value with a very little consumption of
the titrant as shown in below graph.

15. 6. Printing of Test Report
As soon as the analysis is
finished, the test report
is generated and printed
out automatically.

16. Fields of Use
Titration is a widely applied analytical technique.
Some areas where titration is used are given below:
Paints & pigments, Paper & Pulp, Petroleum,
Pharmaceuticals, Rubber, Soaps, Tobacco industry,
Plastic products, Oil Industry Detergents, Chemical
Industry, Zeolites, Mining etc.

17. End of Show

18. Presented By: Executed By:
Eng. Tanzeem Eng. Kamran