Wavelength dispersive X-ray fluorescence sulfur (S) analyzer

Measure ultra-low sulfur (ULS) in petroleum fuels by ASTM D2622-10

Micro-Z ULS

Designed for ultra-low level sulfur analysis of diesel, petrol (gasoline) and other fuels, the Rigaku Micro-Z ULS wavelength dispersive X-ray fluorescence (WDXRF) instrument features a novel design that measures both the sulfur peak and the back-ground intensity. The ability to measure and correct for changes in background intensity delivers a better net peak intensity measurement, resulting in superior calibrations and enhanced real world precision. Rigaku Micro-Z ULS complies with ASTM 2622-10, ISO 20884 and JIS K2541-7 methods.

Superior optics for reliable sulfur analyses

The Rigaku Micro-Z ULS is the ideal solution for sulfur analysis of petroleum based fuels, with a lower limit of detection (LLD) of 0.3 ppm sulfur. Employing robust fixed optics in a vacuum environment, and featuring a specially designed doubly curved RX-9 analyzing crystal, the Micro Z ULS delivers consistent high sensitivity measurements.

ASTM D2622 performance for non-technical users
Specifically designed for non-technical users, all operations – from calibration through routine analysis – can be performed via the easy-to-use interface. And the analyzer can be powered by any standard “wall” AC outlet.
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  • Ultra-low sulfur analysis of diesel and gasoline
  • 0.3 ppm lower limit of detection (LLD)
  • No He(g) purge required
  • Easy-to-use benchtop analyzer
  • Complies with ASTM D2622-10
  • Complies with ISO 20884
  • Complies with JIS K2541-7

Micro-Z ULS specifications


Wavelength dispersive X-ray fluorescence analyzer

     - Includes vacuum pump

Elemental range: sulfur (S), LLD = 0.3 ppm

Application: analysis of fuels for sulfur content

Single measurement position (std. 35 mm cup)

Supported methods

• ASTM D2622-10

• ISO 20884 and JIS K2541-7


40 kV Cr-anode X-ray tube

40 W max power


Doubly curved RX-9 analyzing crystal

Sealed proportional counter

Fixed optics with switchable receiving slit

    - To select peak or background

Pulse height analyzer (PHA)


Sample analysis in air

Optics are under vacuum

Environmental conditions

• Ambient temperatures 15 28°C

Relative humidity <75% non condensing

• Vibration undetectable by human

• Free from corrosive gas, dust, and particles

Dimensions / power

• Analyzer: 450 x 410 x 440 mm, 36 kg

• Pump: 323 x 142 x 189 mm, 10 kg

• 100-120 VAC, 15 A or 200-240 VAC, 10 A


• Embedded dedicated processor

Proprietary operating system


Up to 10 calibrations

Up to 30 standards per calibration

Selectable analysis time (up to 900 s)

Drift correction

Pulse height analyzer (PHA) adjustment

User interface

• LCD display

• Embedded computer

• Membrane keypad and navigation


• Thermal dot printer

• RS-232C data output

Analysis of Ultra Low Sulfur in Automotive Fuels According to ASTM D2622-10



Recent developments in ultra low sulfur (ULS) fuel have improved fuel efficiency and created cleaner exhaust gas. Globally, the permitted sulfur limit in fuel oils has been decreased to 10ppm in many countries and regions. For compliance verification, X-ray fluorescence (XRF) spectrometry is the definitive analysis tool for use at distribution terminal and refineries, as well as mobile or stationary testing laboratories.

In recent years, there has been an increasing need for an instrument which does not require the use of helium gas, for instances, when acquisition or delivery of helium to the analysis site is difficult. The Micro-Z ULS (ultra low sulfur) is newly developed Sulfur analyzer which does not requires helium gas in operation. This application note demonstrates that Micro-Z ULS can meet the requirements of ASTM D2622-10.

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