KOEHLER K90385 Total Acid Number of Petroleum Products by Potentiometric Titration

Test Method
For determination of acidic constituents in petroleum products, lubricants and transformer insulating oils soluble or nearly soluble in mixtures of toluene and propan-2-ol. It is applicable for the determination of acids whose dissociation constants in water are larger than 10-9. The test may be used to indicate relative changes that occur in oil during use under oxidizing conditions regardless of the color or other properties of the resulting oil. 

Automatic TAN Potentiometric Titrator
• Conforms to ASTM D664
• Very easy to use - intuitive keypad and function guide display
• Programmable - 3 easy to use programs depending on TAN content
• Results expressed in mg KOH/g
• 10ml high precision syringe - syringe volume dispensed in 40,000 steps
• Electrovalve fitted to top of syringe to control flow direction of reagent
• Connects to external pc keyboard for easy text and sample information data entry
• Connects to different types of printers, pc and balances
• Data Logger - automatic data storage of last 55 analysis results
• TAN Titrator applies differential measurement. Uses reference electrode with sleeve diaphragm refilled with LiCl 1 mol/L in ethanol and glass + Pt indicator electrode
• Equipped with (2) RS232C ports for connection to printer or PC and for connection to balance

The Automatic TAN Potentiometric Titrator has been designed to offer maximum specifications and features whilst being priced at a very competitive level. Standard operation of the titrator begins with the calibration of the electrodes with an aqueous pH 11 buffer. If the electrodes are in poor the condition, the titrator is capable of detecting this and automatically fails the calibration. Upon successful calibration, the titrator determines the blank value for the titration solvent and automatically stores it in all internal titration programs. The instrument is now ready to perform the TAN analysis. Simply select the suitable titration program in accordance with the expected TAN value of the sample and start the titration. The results are expressed in mg KOH/g. They are stored in the data logger, displayed on the TAN titrator screen, and can also be sent to a printer or PC.

Specifications
Display: Graphic backlit LCD, 128 x 64 dots
Keypad: Membrane, 7 keys, guaranteed up to 6 million strokes per key
Syringe Volume: Standard syringe 10ml
Resolution: 1/40,000 of syringe volume
Dispensing Accuracy: (as relative error) 0.2% for volumes higher than 10% of syringe
Liquid Contact: Syringe: borosilicate glass, polyethylene tip and synthetic plunger
Non-volatile memory: Up to 55 results stored in data logger
Languages: English, Spanish, French, Italian
Materials: 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
Enclosure: ABS and enameled steel
Permitted temperatures: Operating: 10 - 40°C
Storage: 10 - 50°C
80%, relative humidity, non-condensing
Electrical Safety: Meets EC, EN 61010
EMC: Meets EC, EN 50081-2 and EN 50082-2
Power supply: 90-264 V AC, 47-63 Hz

Dimensions wxdxh,in.(cm)
5.1x6.3x11.8 (13x16x30)
Net Weight: 8.8 lbs (4 kg)