JFTOT jet fuel thermal oxidation tester-astm d3241

AD Systems TO10: Setting the New Standard in Jet Fuel Thermal Oxidation Testing

The AD Systems TO10 Jet Fuel Thermal Oxidation Tester (JFTOT) is the most advanced 5th-generation instrument for measuring the thermal oxidation stability of aviation turbine fuels in accordance with ASTM D3241, IP 323, and ISO 6249. Explicitly listed in ASTM D3241-24 (Research Report RR: D02-2071) as a fully equivalent reference apparatus, the TO10 is the benchmark instrument of choice for fuel laboratories, refineries, aviation fuel certification bodies, military fuel qualification programs, and research institutions.

Thermal oxidation stability is one of the most critical quality parameters for jet fuel. When aviation turbine fuel contacts heated metal surfaces within an engine’s fuel system, it can degrade and deposit carbonaceous and resinous deposits on fuel system components, reducing flow, increasing pressure drop, and compromising flight safety. The ASTM D3241 / IP 323 test method simulates these conditions precisely, and the TO10 has been engineered from the ground up to meet and exceed every requirement of this standard with unrivalled precision and operator simplicity.

Fully Automated Operation — From Aeration to Report

Running an ASTM D3241 thermal oxidation stability test with the TO10 is straightforward. After loading and filtering 600 mL of fuel, the entire procedure is automated: fuel aeration, test sequence, operating pressure control at 3.45 MPa (500 psi) ±1%, differential pressure (ΔP) monitoring from 0–750 mmHg, Heater tube rating (with the optional DR10-ITR), and final reporting. The operator initiates the automated test via the smart onboard software, which monitors all test conditions in real time and eliminates the risk of manual error throughout the 150-minute standard test cycle.

The dedicated heater tube positioning gauge allows fast, tool-free assembly of the test section — a task that previously required skilled operators now takes seconds. Together with the fast active cooling system at the end of each test, the TO10 dramatically improves laboratory throughput and productivity.

Precision That Cannot Be Matched

At the core of the TO10’s performance is its heatpipe fluid technology combined with independent Peltier-module-controlled bus bars. Each bus bar is independently managed to maintain a consistent heater tube temperature profile test after test, achieving the ±2°C uniformity of run mandated by ASTM D3241. The embedded-calibration Type K thermocouple (Class 1, 0–500°C range) ensures accuracy without the need for frequent external calibration references.

Fuel delivery is managed by a dual 5 mL syringe pump, providing a standard flow rate of 3.0 mL/min ±1% with zero-flow pulses or peaks—critical for reproducible deposit formation and reliable differential pressure measurement. The air flow humidity is controlled by an automatic desiccant cartridge with a built-in humidity sensor, providing continuous dryness monitoring and alerting the operator when desiccant replacement is required.

Full Traceability — From Test Run to Fuel Certificate

The TO10 delivers complete, auditable traceability of every test run, including tube rating without requiring separate accessories or non-standard consumable tubes. When connected to the DR10-ITR interferometric tube rater, the 3D deposit curve and deposit ratings are automatically linked to the test conditions and the final report in a single action. The combined report can be printed, transmitted directly to a LIMS via Ethernet TCP/IP, or exported via USB — providing the documentation trail required for civilian and military fuel certification under ASTM D1655, D7566, D4054, and DEF STAN 91-091.

Enhanced Safety for Laboratory Environments

The TO10 sets a new benchmark in operator safety for JFTOT testing. The double door enclosure and integrated VOC extraction system protect operators from exposure to hazardous fuel vapours throughout the test cycle. A dedicated light indicator eliminates the risk of burns during tube removal after testing, and automatic beaker detection prevents test initiation if consumables are not correctly positioned — reducing the risk of costly errors and laboratory incidents.

Diesel Thermal Oxidation Testing (DTOT) — No Modification Required

The TO10’s flexibility extends beyond jet fuel. Without any hardware modification, the instrument can be used for Diesel Thermal Oxidation Testing (DTOT) — studying the thermal oxidation behaviour of diesel, biodiesel, and sustainable aviation fuel (SAF) blends. With support for up to 21 customised test methods and a test time range of 4 to 600 minutes, the TO10 is equally at home in R&D environments and high-throughput certification laboratories.

Why Upgrade to the 5th Generation JFTOT?

Not all JFTOT instruments are equal. The TO10 represents a fundamental leap in automation, precision, safety, and connectivity compared to previous-generation thermal oxidation stability testers. Here’s what sets it apart:

The TO10 is not an incremental update — it is a complete reimagining of what a JFTOT instrument should be. For laboratories prioritising result reliability, operator safety, regulatory traceability, and long-term cost of ownership, the TO10 is the clear choice.

Frequently Asked Questions — JFTOT & ASTM D3241