WDX400 Wavelength Dispersive X-ray Fluorescence Spectrometer

X-ray fluorescence (XRF) is a powerful analytical method used in a wide variety of industries to determine the elemental composition of various materials.

Wavelength dispersive X-ray fluorescence (WDXRF) is the old timer among commercial X-ray spectrometers since the method works without high-resolution solid-state detectors. Instead, WDXRF instruments rely on diffractive optics to give them high spectral resolutions. WDXRF spectrometers with simple electronic counting circuits were around well before the computer age, and are still the workhouse and leading performer for routine XRF analysis.

The Skyray WDX400 is a high performance WDXRF spectrometer able to meet the requirements of a tremendous variety of elemental analysis applications with accurate, rapid, and non-destructive features. It can be used to measure virtually every element from sodium to uranium with concentrations ranging from a few ppm to nearly 100 percent. It can be used for monitoring major composition of a product or process or the addition of minor additives. The WDXRF system is extremely popular in cement quality control, geological survey, and is often used for measuring raw materials for minerals, building materials and other finished products made from minerals.

Building materials applications

  1. Cement clinker and raw meal (Na, Mg, Al, Si, S, K, Ca, and Fe)

  2. Cement wallboard (Na, Mg, Al, Si, and Fe)

  3. Lime, limestone, and dolomite (Na, Mg, Al, Si, K, Ca, and Fe)

  4. Sand and glass (Na, Mg, Al, Si, K, Ca, and Fe)

  5. Ceramic, bricks, clays, Kaolin, etc.

  6. Refractory materials

Mineral (ore) applications

  1. Minerals (aluminium, iron, copper, chromite, lead, zinc, nickel, manganese, alumyte, molybdenum, tantalum, silver, vanadium, etc.)

  2. Slags, feeds, concentrates and tailings

  3. Phosphate rock and fertilizer (P, S, Ca, Fe)

  4. Kaolin and other clays (Mg, Al, Si, Ca, Ti, Fe)

  5. Gypsum (Ca, S)


Analyzable element range

11Na (sodium) ~ 92U (uranium)

Element concentration range

Dynamic from ppm-level to nearly 100 percent

Simultaneous analysis

Maximum 10 elements at a time

Acceptable Sample type

Solid, powder, fused bead, tablet

Sample chamber


Air or vacuum

Inside dimensions

54.5mm (diam) x 38.0mm (height)

Testing time

3 ~ 5 minutes

Precision (repeatability)


Environmental requirements


15°C – 30°C

Relative humidity

35% ~ 70% (no condensation)


Free of particles, corrosive gases, perceptible vibration

Power requirements

AC 220V/110V ±5V, 50Hz (optional AC purified regulatory power supply)

Dimensions of main unit

765(W) x 1110(H) x 885(D) mm

Net weight

XRF unit

Approx. 350 kg

Vacuum pump

Approx. 25 kg

Main Features:

  1. Extremely high precision accurate & rapid solution to elemental analysis of powder and lump sample.

  2. Originally created total spectrum detection technique realizes real-time tracing and correcting for each spectrum line, that greatly improves the repeatability and stability of quantitative analysis.

  3. Easy setting and modifying of instrumental parameters under man-machine interaction.

  4. Self-developed XRF analysis software system makes instrument work as OPC server to seamlessly connect with DCS system or QCX system built on the OPC framework.

  5. Two kinds of quantitative analysis software packages are available: empirical coefficient method and theoretical α-coefficient method, the latter method reduces needed quantity of standard samples with the same analysis accuracy.

  6. Test report is developed into Excel file for easy data storage; give customers a professional results page.

Basic Configurations:

High voltage supply

Maximum power

400W (50kV, 8mA)


<0.05% per 12 hours

X-ray tube


Varian Medical Systems, Inc. (USA)


400W thin beryllium end window X-ray tube

Target material

Rhodium (Rh), Palladium (Pd)


0.1% over 4 hours


Primary collimator + Secondary collimator

Standard element channels

Na, Mg, Al, Si, P, S, Cl, K, Ca, Fe (available change to other elements)

Detector system

Gas proportional counter detector

Sealed proportional detector

10-path 1024 channel independent pulse analyzer

Multi-channel analyzer


Simultaneous detection of every element spectrum peak.

Convenient for instrument debugging and troubleshooting.

Improve working stability

Gas flow system

Gas density stabilizer with pressure stability within ± 0.003kPa

Thermostatic chamber

Temperature control stability up to ± 0.1℃

Vacuum system

Independent oil vacuum pump (2 liters Dewar capacity)

High vacuum degree down to 8Pa


Industrial 104 computer


Qualitative analysis

Measurement and analysis of measured data

Linear fitting

Quantitative analysis

Calibration curve method, matrix correction


Automatic correction for spectrum line

Monitoring of operating condition of the instrument

Function of tabulating the results of analysis