Compact and robust measurement cell

For process reliability during measurements under harsh conditions

Excalibur HD Flange Measurement Cell

Compact Measurement Cell - optionally with Internationally Recognized CE-Certification in Accordance with the Pressure Equipment Directive (PED) For Industrial Process Analytical Technology (PAT)

Excalibur HD Flange

This optical flange measurement cell from Hellma consists of two optics which, combined with a central part, result in a flow cell. This compact measurement cell can be safely integrated into an existing system with little effort. The materials used are resistant to organic solvents and many acids and alkalis. Instead of elastomers, the cell uses patented metal seals with a high chemical and temperature stability.


Robustness and precision are combined in one product. This guarantees a long service life and best results. Measurement cells of this category are particularly suitable for transmission measurements under harsh process conditions.


Excalibur HD Flange Measurement Cell - For Industrial Process Analytical Technology (PAT)

Special product advantages

Very robust design

  • Optimal heat protection of optics and light guides
  • Operation in ATEX-zones 1, 2, 21, 22 possible
  • Maximum safety for employees and plant - no accidental opening possible due to the firmly welded design
  • CE certification according to DGRL 2014/68/EU can be carried out as an option


Simple installation

  • Very compact design
  • Space-saving installation in pipe systems
  • Flanges up to DN100 possible – well suited for large media flows


High precision and simple method transfer

  • Extremly precise path length accuracy through fixed set-up without spacers 
  • No accidental adjustments of the path length possible
  • Very high measurement accuracy simplifies method development and method transfer 

Measuring gap of the Excalibur HD Flange

High-quality measurement optics

  • Very high transmission in Hellma quality
  • Firmly welded sapphire optics instead of screwed optics
  • No wear parts, maintenance-free, very long service life

Typical Applications 

  • Identification of educts, monitoring the quality of raw materials
  • Controlling the mixing ratio and the homogenity of major constituents in mixtures
  • Monitoring chemical reactions in tube reactors
  • Controlling chemical reactions in the bypass or at the exit of the reactor
  • Spectroscopic online measurement in oil production

Excalibur HD Flange-Standard Configuration

To find your ideal configuration for this product, please follow the "adjust configuration" button at the end of this table

Model series Excalibur HD Flange
Measuring principle TRANSMISSION
Wavelengths for UV/Vis: 280 nm - 1100 nm; NIR: 400 nm - 2300 nm
Connection Diameter of fiber core 600 µm and numerical aperture 0.22
Temperature Restrictions T max: optical connector 150 °C (without ext. fiber), Copex PMA 130 °C (85 °C for ATEX)
Pathlength Tolerance ±0.1 mm
Temperature -10 °C to 300 °C
Pressure -1 bar to 40 bar
Delivery Optical measurement cell, manual, customer information drawing, pressure test certificate, transmission test report, transport packaging
Expected delivery time on request
Article number FEB_
Price per unit on request
Quantity 1

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Optical Probes and Flow Cells Configurator

Hellma offers the largest selection of products worldwide and the highest level of expertise to support your online measurements from UV to IR. Find the right measuring interface quickly and easily or configure your individual immersion probe or measurement cell.

Products of the brand:

Excalibur HD Flange (Datenblatt_EN)



Hellma USA Inc.
120 Terminal Drive
11803 Plainview, NY
United States

Phone: +1 5169 3908 88


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