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Reflection probes with fibre bundles and hygienic design

These Hellma reflection probes are especially suitable for measurement of diffused reflection in the Vis and NIR range with FT-NIR spectrometers or diode array spectrometers.

The spectrometric measurement of the diffused reflection is a powerful tool for qualitative and quantitative analysis of powdered or granuled solids and compounds. A part of the diffused light penetrates into the surface and thus leads to a probe-specific change in the spectrum, from which inferences for the material properties can be derived.

Product info 668.008

Product info 668.008

Type668.008
Material in contact with sampleSapphire, Stainless steel 1.4435 (316L), EPDM*
Window materialSapphire
SealEPDM* (FDA konform)
Temperature range5 °C to 140 °C
Outer Ø30 mm
Length of the probe barrel250 mm
Measuring spot Ø4 mm
Max. pressure10 bar
Fibre-optic cable

Built-in, not exchangeable
Optical fibres with low OH content (NIR)


Diode array configuration
7 x 600 μm core diameter (illumination)
1 x 600 μm core diameter (detection)
FT-NIR configuration
7 x 600 μm core diameter (illumination)
7 x 600 μm core diameter (detection)

30 ° Geometry

Total length of the fibre cableapprox. 2 x 3 m
(2 x 2.8 m of it outside the probe) **
Optic fibre connections2 x FSMA Type 905 or 14 x FSMA Type 905
Optic fibre materialQuartz glass
Numerical aperture
of the optic fibre
0,22
Spectral range400 nm - 2300 nm (25.000 cmˉ¹ - 4.348 cmˉ¹)


* available with FFKM seal as well **other fibre lengths optional
Other variants on request

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Product info 668.006

Product info 668.006

Type668.008
Material in contact with sampleSapphire, Stainless steel 1.4435 (316L), EPDM*
Window materialSapphire
SealEPDM* (FDA konform)
Temperature range5 °C to 140 °C
Outer Ø25 mm
Length of the probe barrel250 mm
Measuring spot Ø3 mm
Max. pressure10 bar
Fibre-optic cable

Built-in, not exchangeable
Optical fibres with low OH content (NIR)


Diode array configuration
7 x 400 μm core diameter (illumination)
1 x 600 μm core diameter (detection)

30 ° Geometry

Total length of the fibre cableapprox. 2 x 3 m
(2 x 2.8 m of it outside the probe) **
Optic fibre connections2 x FSMA Type 905
Optic fibre materialQuartz glass
Numerical aperture
of the optic fibre
0,22
Spectral range400 nm - 2300 nm (25.000 cmˉ¹ - 4.348 cmˉ¹)


* available with FFKM seal as well ** other fibre lengths optional

Other variants on request

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