India’s Largest Manufacturer and Exporter of Magnet based high precision electronic balances.


Contech Instruments Ltd.

Company was awarded
ISO 9001 : 2008,
ISO 14001:2004,
OHSAS 18001:2007
Management Systems in
the year 2014. 

Contech Instruments Ltd.

is a leading manufacturer and exporter of high precision Electronic Balance that has for the past few years provided the industry with quality products like electronic balances, weighing machines

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XRF is used to detect and analyze noble metals like Gold ( Au), Silver (Ag), Platinum (Pt),Iridium (Ir), Osmium (Os), Palladium (Pd), Rhodium (Rh), Ruthenium (Ru), Copper (Cu), Zinc (Zn), Nickel (Ni), Cadmium (Cd), Iron (Fe), Cobalt (Co), Indium (In), Tin (Sn), in the Jewellery Industry.

Energy Dispersive X-ray Fluorescence (EDXRF) technique relies on the detector and the detection circuit capability to resolve spectral peaks due to different energy X-Rays emitted when a primary X-Ray beam strikes a metal alloy corresponding to different elements in the sample, intensity of the spectrum radiation proportional to the concentration of element. The spectrum is then processed through the powerful computer software which calculates and reports the various elements & their composition in the sample.

XRF Gold Purity Tester consists of X-Ray tube, high voltage power supply for X-Ray source, X-Ray tube filters, X-Ray fluorescence Detector, processing electronics and system interface & an external computer. A camera is incorporated in the system to view the sample on the computer screen.

Detectable elements : Iron (Fe), Cobalt (Co), Nickel (Ni), Copper (Cu), Zinc (Zn),
Ruthenium (Ru), Rhodium (Rh), Palladium (Pd), :
Silver (Ag), Cadmium( Cd), Indium (In), Tin (Sn),
Osmium (Os), Iridium (Ir), Platinum (Pt), Gold (Au)
Measurement Results : Cu (Combined with Fe, Co, Ni, Zn)
Ag (Combined with Ru, Rh, Pd, Cd, In, Sn) :
Au (Combined with Os, Ir, Pt) :
Accuracy of measurement : +0.3% (Molten Metal above 90% Au)
+0.5% (Molten Metal below 90% Au) :
+1% (Molten Metal below 50% Au)
Sensor :   Gas Proportional Counter
Cooling for Detector : Air
Detection Range : 1%-----99.99%
Testing Time : 30-----200 secs
Test Spot Area : 0.3mm
Power Supply : 200-240V AC, 50/60Hz
Power Rating : 130 Watt
Working Temperature : 15-25oC
Relative humidity : <70%
Operation atmosphere : Vibration free surface and air conditioned room
Interface for Computer : Inbuilt (External Monitor, Keyboard required)
Software for Operation : Menu Driven User Friendly Operating System
Dimensions of Instrument : Length : 450mm  Width : 350mm
Height : 345mm (with test compartment cover in : closed  
                           position) & 565mm (in open position)
Dimensions of Sample Chamber : Length : 300mm   Width : 255mm    Height : 80mm
Net Weight : 30kg





XRF is a reference technique, hence standards are required for quantitative results. Standards are analyzed, spectral intensities generated are used to obtain a intensity v/s concentration plot for calibration. This calibration is used to evaluate the spectral intensities of unknown samples.

How to get best results from XRF Spectrometer :
XRF is a reference method, proper standardization of the equipment is required for accurate results.
In order to get most appropriate results, testing at different points is necessary especially when the jewellery design is intricate.
Adequate warm up period, sturdy working surface, stable power supply, proper grounding and conditioned atmosphere is required to achieve the best product performance.
For powder sample, proper grinding of sample minimizes scattering effect.
For solid sample, surface polishing minimizes the scattering effect.
Flat surface of the sample yields the best results.
Due to different melting points, atomic structure and crafting techniques, not all the elements can be melted with noble metals.


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