Robust and highly precise Flow-Through Cell

For Spectroscopic Online Measurements of Gases and Liquids

Excalibur HD FCP Measurement Cell

For precise spectroscopic online measurement of gases and liquids under harsh process conditions

In the chemical, petrochemical, paint & coatings and agricultural industries, process optimization is playing an increasingly important role in ensuring competitiveness.

For the sustainable success of manufacturing companies within these industries, it is therefore necessary to continuously improve existing manufacturing processes in terms of process reliability, product quality and cost reduction. These are drivers for close-meshed process monitoring and control using online analytics, especially spectroscopic methods.

However, process conditions are often adverse and require measuring components that are not only robust but also fit into the overall system. Support comes here in the form of the »Excalibur HD FCP« measuring cell.

The uniquely robust stainless-steel measuring cell with metal seals, sapphire optics and inert gas filling, is universally safe to use up to a pressure of 250 bar as well as temperatures up to 300 °C, even in potentially explosive zones.

Robust and maintenance free, suitable for heavy duty use

Easy to integrate and compatible with all standard process spectrometers

Can be used in potentially explosive zones                                        

Online measurements directly in the product flow or bypass

Spectroscopic UV, Vis or NIR online measurements in real time are standard in industrial process analytical technology (PAT). They provide data on the composition and quality of liquids and gases directly from the process flow or can be used for monitoring reactions in the bypass. Based on real-time data, the effects of process parameters on product quality or the performance of downstream processes can be reliably identified and quick decisions made for further improvements.


Exceptionally robust measurement cell for process use

The »Excalibur HD FCP« measurement cell is particularly pressure and temperature resistant (up to 250 bar / 300°C) by using wear-free metal seals and sapphire optics. Maintenance-related failures or downtimes are eliminated - process costs are reduced.

The measurement cell is filled with nitrogen. The slight overpressure and the presence of a second barrier prevent the medium from escaping. This means that the measurement cell is well equipped for use in demanding process environments.

Special product advantages

Safe Operation

  • Can be used in potentially explosive areas (ATEX zones 1, 2, 21 and 22)
  • Second barrier with nitrogen filling
  • Pressure and temperature resistant up to 250 bar / 300 °C

No Downtime or Maintenance

  • Robust construction with metal seals
  • Use of sapphire optics
  • No wear parts

Flexible Adaptation and Integration

  • Easy to understand and easy to configure (Hellma online configurator)
  • Can be used for liquid or gaseous substances thanks to the interchangeable central cell part
  • Problem-free installation thanks to standardized connections
  • Compatible with all commercially available process spectrometers

Reliable and Precise Measurements

  • H-Cell central part with highest precision for path lengths of 2 mm, 5 mm and 10 mm
  • Precise measurements and high reproducibility guaranteed

Uniquely robust measurement cell for process use in potentially explosive atmospheres

»Excalibur HD FCP« flow-through cell with central part »T-Piece« for gaseous media

Interchangeable central part »T-Piece« made of stainless steel

For gas measurements in hazardous areas (path lengths from 100 mm to 2,000 mm)

Uniquely robust measurement cell for process use under harsh conditions

»Excalibur HD FCP« flow-through cell with central part »H-Cell« for liquid media

Interchangeable central part »H-Cell« made of stainless steel

For high-precision liquid measurements (path lengths 2 mm, 5 mm or 10 mm)

Interchangeable central part »X-Cross«

Cost-effective and readily available variant for liquid measurements (path length 2,5 mm)


»Excalibur HD FCP« measurement cell for a wide range of applications



Paints and coatings


Measurements of gases and liquids in pilot plants and in the manufacturing process

  • Monitoring the moisture content in clean gases
  • Monitoring of chemical reactions
  • Quality control of raw materials
  • Measurement of the water content of solvents
  • Real-time measurement of gas flows in the petrochemical industry

Excalibur HD FCP - 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 FCP Cell
Measuring principle TRANSMISSION
Wavelengths for UV: 200 - 800 nm (opt. 230 - 250 nm); Vis: 400 - 2000 nm; NIR: 800 - 2500 nm
Housing Material The connection housing material is aluminum (no ATEX) or stainless steel (with ATEX)
Connection Connection of measuring finger with 0.75 Inch Swagelok
Path Length Tolerance (* for individually ordered H-Cells ±0,2mm)
Optical Connection Optimized for fibers with 600 µm, NA 0.22
Temperature -190 °C to 300 °C
Pressure -1 bar to 250 bar
Delivery A) Cell body with packaging | B) Single optical finger with manual, certificate of the pressure test, protocol of the transmission test, transport packaging | A+B) Complete cell with 2 optical fingers, scope of delivery like B
Expected delivery time on request
Article number CAC_
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 FCP Measurement Cell (Broschure EN)


Excalibur HD FCP (Datasheet EN)


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United States

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