JFTOT Deposit Rater 

Thermal Oxidation Stability of Aviation Turbine Fuels, ASTM D3241 is universally used by the industry to measure high temperature stability of aviation turbine fuels. The ASTM D3241 Deposit rater is required to be run on every batch of jet fuel produced according to ASTM D1655 or DEF STAN 91-91 specifications. In this test method, the fuel is pumped through heater tube at fixed flow rate and during a specified period of time.

The fuel is pass or fail rated according to the amount of deposit formed on the heater tube at a specified temperature. Traditionally, the amount of deposit on the tube is rated visually against a reference color scale. The proper rating requires significant experience and expertise. However, operator capabilities vary, so evaluation of color can be quite subjective.

New! Innovative DR10 Instrument

A new instrumental method of quantitative measurement of tube deposits has been developed by AD Systems, in which the thickness of the deposit is accurately determined by an automatic instrument, reducing test subjectivity. The innovative DR10 Deposit Rater instrument uses an interferometry technique (ITR) for precise measurement of deposit thickness in nanometers. This stand-alone compact instrument can be easily installed in any location in minutes. The operation is based on a powerful light source, a spectrometer with fiber optic probe and specially designed application software.


ASTM D3241 ,IP 323, ISO 6249
Aviation Turbine Fuel – Standard Specification ASTM D1655 and Def Stan 91-91

The DR10 ITR – Tube Deposit Rater is now part of ASTM D3241-14B, Annex 2. Annex 2 provides for the use of the ITR technique (Interferometry Tube Rating) which is the technique used by the DR10.


  • Absolute measurement of deposit thickness
  • Quick, accurate and objective rating
  • Push of a button operation
  • Very compact design
  • Rigid construction


The DR 10 is designed for all types of applications related to thermal oxidation testing of aviation turbine fuels including research, refining, pipeline, terminals, and mobile laboratory applications – every location where thermal oxidation of jet fuel is evaluated


Reported results Measurement range
Average thickness
10 to 1200 nm
Maximum thickness 10 to 1200 nm
Maximum thickness on 2,5 mm² area 10 to 1200 nm
Deposit volume 0 to 0.5 mm³
Number of measurement points 1,200 points
Test duration Less than 15 minutes