EEU Tender for oil test instruments
ETHIOPIAN ELECTRIC UTILITY (EEU) Technical Specifications for automatic titration for measuring total acidity in insulating oils as per IEC-62021 and ASTM D-664
1. Measurement system
pH: 0.00-14.00
mV: more or less 1200
Resolution: 0.002pH (min)

2. Calibration
Minimum three Point pH Calibration. NIST traceable PH standards in sachets for 4,7 and 10 (10 No's Each) shall be supplied along with the Instrument.

3. Titration Types
End point titration method up to 11.5pH as per IEC - 62021 TAN/BAN as per ASTM D-664

4. Reagent addition
(1) Pre dosing w.r.t volume titration time mV or pH facility to reduce the titration time
(2) Equivalence Method
(3) End Point Titration
(4) TAN/BAN as per ASTM D-664
(5) Dynamic dosing (For titrations with variable dosing speed, automatic slow-down as end point approaches).

5. Modes of Titration
Blank, Normality, Sample testing

6. Titration stop criterion
w.r.t fixed end point mV or pH, volume and w.r.t slope.

7.Memory
Instrument shall have memory for storing the method

8.Calculations
Automatic calculation of results with desired unit of expression (mg KOH/g) , with display and print out with graph ("S" curve & derivative curve)

9. Burette
Capacity: 10mL
Resolution: 0.001 mL/step or 1/10000 of burette volume or better
Accuracy: 0.02 ml (min)

10. Titration Vessel
Volume: Minimum 100 ml with head & bottom of titration vessel (titrations shall not be exposed to atmosphere). Easy to Mount.

11. Overhead/Teflon Stirrer
Adjustable Speed, manual stand rod, electrode and titration holder, stirring bars, Teflon rod stirrer / propeller type.

12. Electrode
Electrode shall suitable for non-aqueous titration. It shall be either a combination electrode or a set of measuring & reference electrodes and the minimum range shall be 0-14 ph. With an accuracy of 0.001 ph.

13. Glass Bottle
Borosilicate: 1 lit with ISO threaded (Dark), cap and connectors (Provision shall be there for breathing operation)

14. Display
20 character with backlit 2 line LCD

15. Key board
Water Proof, Alpha numeric, Afford access to Concentration of Titrant, Blank Qty, Identification, start titration, start/stop stirrer

16. Measuring Inputs
a) pH/mv
b) Reference
c) Temperature

17. RS232/USB
Should have facility to connect: PC/Printer/Balance

18. Printer
Laser jet

19. Power
230V more or less 10%, 50 Hz

20. Working Environment conditions
Temp: 10 deg C to 40 deg C
Humidity: 10 to 90%

21. GLP
Date Time and Serial no of the instrument, etc.,

22. Software
Complete software for controlling the instrument, programming the methods, Report preparation and data downloading compatible with WINDOWS XP or VISTA.

23. Annual Maintenance Contract
AMC shall be offered for period of FIVE years after expiry of warranty. AMC shall minimum include two preventive visits and break down visits as required per year.