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Benchtop Electron Spin Resonance (EPR/ESR) Spectrometer.

Benchtop Electron Spin Resonance (EPR/ESR) spectrometer.

Active Spectrum introduces the world's smallest Benchtop Electron Spin Resonance (EPR/ESR) spectrometer.

The Benchtop Micro-ESRT includes our patented miniature electron spin resonance spectrometer, operating at 9.6 GHz, with a sweep range of up to 350 Gauss and sub-micromolar sensitivity in aqueous solution.
Also included are a full Windows computer system, integrated touchscreen, Ethernet and multiple USB ports.

Scientific research, education, and industry applications of electron spin resonance are now
extraordinarily cost-effective.

ASI's Benchtop Micro-ESR includes our patented miniature electron spin resonance spectrometer operating at 9.7 GHz with a sweep range of over 300 Gauss and sub-micromolar sensitivity.
Also included are an automatic temperature controller and full Windows 7 computer system with ethernet and multiple USB ports

The spectrometer can be purchased with a number of variable temperature control options.


Parameter X-band (9.5 GHz)
Sensitivity 0.1 µM
Minimum sample volume 100 µL
Magnet Assembly 3480 + 150 Gauss
Magnetic Field Uniformity 0.25 Gauss
Supply Voltage 15 VDC / 6.7A (120V/240V Wall Adapter Included)
Data Interfaces Ethernet and USB
Temperature Controller Included
Dimensions 12"x8"x5"H
Internal Bore Diameter ø4.0 mm
Maximum Pressure 100 psi
Fluid Fittings 1/4" Swagelok
Maximum Oil Inlet Temperature 160°C
Operating Temperature Range -30°C to +55°C
Supply Voltage 12-32 VDC / 2.5A


• Crude oil analysis: asphaltene and vanadium content
• Lubricants analysis: oxidation of engine oil, hydraulic oil and turbine oil
• Spin-trapping (PBN, TEMPOL, DMPO)
• Shelf life of food products (vegetable oil, beer, wine)
• Biodiesel oxidative stability
• Detection of raw fuel dilution in marine engines
• Thermal coking
• Soot
• Catalyst coking