XT Series Laboratory Analyzer for Total Sulfur and Total Nitrogen

XT Series Analyzer (XTS-1000) with Autosampler (LAS-1000) and External Injection Module (EIM-100)
XT Series Analyzer (XTS-1000) with Autosampler (LAS-1000) and External Injection Module (EIM-100)

ATOM Instrument offers the most innovative laboratory analyzers on the market for Total Sulfur and Total Nitrogen measurements. All XT Series Analyzers are designed and built for precise, accurate and reliable analysis with the flexibility that allows the measurement of a wide range of samples with a single instrument. Analyzer versatility enables operation with either air or Oxygen- Argon mixtures for combustion. XT analyzers offer rapid analysis combined with the highest dynamic range on the market, which allows measurement of a broad range of samples with a single method using a single calibration. The efficient and compact design reduces required benchtop space to a minimum while maintaining complete accessibility to analyzer components.

• Exceptional Analytical Performance
• Highest Dynamic Range Available
• Stable and Precise Trace Measurement
• High Reliability
• Small Footprint and Overall Size
• Safer Operations When Running Air
• High-Speed Analysis
• Versatile Analyzer for Liquids and Gases

Excimer UV Fluorescence (EUVF) Provides High Sensitivity with High Dynamic Range and Unequaled Stability

The XT Series utilizes patented EUVF technology which achieves high detection sensitivity with minimal nitrogen interference. Coupled with proprietary signal processing technology enables the XT analyzers to achieve the highest dynamic range of any analyzer available on the market. These technologies enable extremely high precision and stable results across all measurement ranges.

Advanced Nitrogen Detection Technology Provides High Sensitivity with High Dynamic Range and Stability

The XT Series utilizes the same proprietary signal processing technology for nitrogen measurement. This technology, along with enhanced chemiluminescent detector design, provides extremely low background noise for trace nitrogen measurement of samples with diverse concentration using one single calibration.

Principle of Operation

Measurements start with the combustion of injected samples at high temperature (1050°C). For hydrocarbon species:

R-SH + R-NH + O2 → SO2 + CO2 + H2O

After removal of water (H2O), sulfur dioxide (SO2) is excited by the Excimer UV light emission, generating a secondary emission known as fluorescence which is proportional to total sulfur in the sample:

SO2 + hv → SO2* → SO2 + hv’

Nitrous Oxide (NO) produced during combustion is reacted with Ozone (O3) to generate a chemiluminescence emission which is proportional to total nitrogen in the sample:

NO + O3 → NO2 + O2 → NO2 + O2 + hv’

  • User-Friendly & Intuitive
  • Easy Calibration and Method Setup
  • Real-Time Monitoring of Analysis
  • Calibration and Sample Recalculation Feature
  • Multi-Level User Login
  • Idle Mode Operation
  • Full Operation of External Injection Module and Autosampler

Optional Modules Extend Analytical Capability

The ATOM Liquid Autosampler (LAS-1000) and External Injection Module (EIM-1000) allow measurement of an extended range of liquids, gases and LPG products. The autosampler injects liquids and utilizes XYZ vectorized movement for sampling and injection for quick analysis. It is fully user-programmable to allow utilization of specified settings for intended samples. The direct screw drive Z-axis ensures the highest reliability throughout autosampler life.

The EIM  is designed for injection of  gaseous and LPG  samples using a micro-electric actuator, eliminating the need for supplemental carrier for sample valve operation. Injected samples are carried from the EIM to the analyzer using specialized tubing, enabling optimal analytical performance. The EIM is generally installed adjacent to the XT analyzer and configured directly through the computerized user interface.


xt software calibration

All XT Series analyzers come complete with a standard desktop computer and intuitive software that is both user-friendly and highly configurable. The various settings allow flexibility of method configuration and sample combinations that provide a maximum range of analysis. Calibration menus provide an array of charts and tables that reflect analysis results that include statistical computations that analyze the quality of calibrations. Calibrations can be updated without the need to re-run standards and with automatic reprocessing of analytical results. Export and print features allow easy access to data for storage, archiving and processing. Sample menus allow users to group samples where each sample may be run using a different method and calibration. This can facilitate analysis of sample groups by plant area or sample type and eliminate the need to set up groups for each calibration. The software comes with a preloaded “Idle” method that automatically engages according to user-defined parameters thereby minimizing utility consumption when the analyzer is not in use.

xt software additional detials

Outstanding Analytical Performance

SampleSulfur Concentration (ppm)SD (ppm)RSD (%)Nitrogen Concentration (ppm)SD (ppm)RSD (%)Module
RFG 1*10.440.0111.1---LAS
RFG 231.450.1280.418.070.0680.84LAS
RFG 35.010.0531.064.520.061.33LAS
ULSD 10.940.022.16---LAS
ULSD 2*8.110.0720.89---LAS
ULSD 35.910.0380.6410.50.0970.92LAS
Toluene (Technical Grade)2.060.0341.670.410.0071.74LAS
Butane 1*9.970.0960.97---EIM
Butane 2*7.990.0851.06---EIM

The XT Series analyzers provide unmatched analytical performance. The table above showcases results obtained with various samples using an XT-2000 with autosampler (LAS) or External Injection Module (EIM). Samples include various grades of gasoline, diesel, LPG and aromatics matrices. Each sample was run 10 times using air or argon/oxygen mixture. Results reflect impressive analytical performance averaging a relative standard deviation around 1%. (*Denotes analysis using air)

Analytical Performance   
Measurement MethodTotal SulfurExcimer UV Fluorescence (EUVF)
Total NitrogenChemiluminescence
ASTM MethodsTotal SulfurD5453, D6667, D7551
Total NitrogenD4629
Measurement RangeTotal Sulfur0-10%*
Total Nitrogen0-10%*
RepeatabilityTotal Sulfur30 ppb or 2% whichever is greater
Total Nitrogen30 ppb or 2% whichever is greater
Analysis Time3 minutes (Typical)
Typical Sample SizeAutosampler Liquid 5-20 µL, EIM LPG 10 µL, EIM Gas 2.5 mL
Utility Requirements
Power90-240 VAC, 50/60 Hz. Analyzer peak power consumption: 1400 Watts
Gases (Sulfur >1ppm)Zero Grade Air450 SCCM, 3 bar (40 psig)
Gases (Nitrogen and Sulfur <1 ppm)
Ultra High Purity Oxygen350 SCCM, 3 bar (40 psig)
Ultra High Purity Argon150 SCCM, 3 bar (40 psig)
Physical Parameters
Dimensions457 mm (18.0 in) Wide x 508 mm (20.0 in) Deep x 414 mm (16.3 in) High
Weight35 kg (77 lb)
*Dependent on user application