Oils continually react with atmospheric oxygen to produce organic oxidation products that are acidic in nature. At ambient temperature, this reaction is very slow and has little effect upon oil conditions.
At the elevated temperatures that exist within an operating engine, reaction rates are much higher. Elevated operating temperatures can generate high levels of weak organic acids. They cause increased oil viscosity and can deposit as lacquers on hot surfaces.
Total Acid Number or TAN is the measure of both the weak organic and strong inorganic acids present in oil. It is applicable to gearbox, gas engine, gas turbine and hydraulic lubricants. It is an important quality measurement of crude oil. The TAN value indicates to the crude oil refinery the potential of corrosion problems
Total Acid Number is an analytical test to determine the deterioration of lubricants. The more acidic a lubricant is, the further its degradation has proceeded.
Theoretically, the Total Acid Number (TAN) is the amount of potassium hydroxide in milligrams that is needed to neutralize the acids in one gram of oil.
TAN value can be measured by potentiometric titration. The sample is dissolved in toluene and propanol with a little water and titrated with alcoholic potassium hydroxide. A glass electrode and reference electrode is immersed in the sample and connected to the instrument. The meter reading (in millivolts) is plotted against the volume of titrant. The end point is taken at the distinct inflection of the resulting titration curve corresponding to the basic pH 11 buffer solution.
Non-volatile memory: 3 titration programs depending on TAN content, Blank titration, Clock/calendar.
Header texts: 2 lines x 40 characters. Name of up to 4 operators, Up to 50 results stored in Data Logger
Languages: English, Spanish, French, Italian
Display: Graphic backlit LCD, 128 x 64 dots
Keypad: Membrane, 7 keys, guaranteed up to 6 million strokes per key
Material: PET with protective treatment
Syringe volume: Standard syringe 10 ml
Resolution: 1/40000 of syringe volume
Dispensing accuracy: (as relative error) ≤ 0.2 % for volumes higher than 10 % of syringe
Dispensing reproducibility: ± 0.1 % for volumes higher than 10 % of the syringeLiquid contact materials : Syringe: borosilicate glass and PTFE
Electrovalve: PTFE and KEL-F. Tubes: PTFE
Inputs and outputs: Differential measurement: 2 BNC connectors, For external keyboard, miniDIN connector. RS232C bidirectional for PC or printer, telephone connector. RS232C for balance, telephone connector
Stirrer control: On/Off and speed, RCA connector
Power supply: 90 – 264 V AC, 47-63 Hz
Electrical safety: Meets EC, EN 61010
EMC: Meets EC, EN 50081-2 and EN 50082-2
Permitted temperatures: Operating: 10 – 40 ºC. Storage: 10 – 50 ºC ≤ 80 %, relative humidity, non condensing
Enclosure: ABS and enamelled steel
Physical parameters: ABS and enamelled steel