A:Brief description: DSHD-251 Base Number Tester is designed according the industrial standard of People’s Republic of China SH/T0251-93 Test method for alkali value of petroleum products. It is Consists of DSHD-2A automatic potentiometric titrator, titrate stand and burette. Its main function is to determine the alkali component of petroleum products and used petroleum products and additives. B:Main advantages: 1.This instrument adopts principle of acid-alkali neutralization and method of potentiometric titration for perchloric acid to determine the alkali value of sample by judging the electric potential change to finishing point. 2.This instrument is equipped with 5 pieces of electrodes and 3 pieces of burettes of different specifications.It can satisfy the determination for alkali component of petroleum products. 3.The measuring range of the instrument is wide,measuring accuracy is high. Accessories complete and convenient to use. C:Main technical specifications and parameters DSHD-2A automatic potentiometric titrator （the outside drawing,size and net weight refer to real product） 1. Measuring range: pH:(0～14.00)pH； MV：(0～±1999)mV 2. Measuring accuracy: pH:±0.01； MV:0.1%F.S 3. PT control accuracy: ±0.03pH or ±3mV； 4. Input impedance:≥(1×1012)Ω 5. Repeatability of volumetric analysis:≤0.3%F.S 6. Room temperature:(0～35)℃ 7. Relative humidity:≤85% 8. Overall dimension:280mm×200×mm×130mm（ Main machine） 9. Net weight:3.5Kg D:More Acid&Base Number Tester: DSHD-251 Base Number Tester DSHD-259 Water- Soluble Acid & Base Tester DSHD-264 Acid Number and Acidity Tester DSHD-264A Automatic Acid Number Tester