Products  Kaiser Raman Probes   Kaiser Raman WetHead Probe

Kaiser Raman WetHead Probe

Designed to promote versatility and materials compatibility

The WetHead probe is a compact, sealed immersion probe for in situ Raman spectroscopy of liquid-phase samples in a laboratory or process plant setting. The process connection for the WetHead can be swaged, compression-mounted, flange-mounted, or installed in a Kaiser flow cell, and is NeSSI compatible. These versatile options allow for direct insertion in slip-streams, drain-values, reactors, circulation loops, blend headers, and inlet or outlet pipework.

The WetHead probe is available in two variations—the WetHead Max and the WetHead Mini—to aid customization to your process and offer greater sampling flexibility. In addition, the WetHead probe is compatible with installations in hazardous areas/classified environments.

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  • Customizable to your process
  • Robust design with a range of process connections
  • In situ/no transfer lines or fast-loops required
  • Faster, simpler installation
  • Support for a range of chemical processes and corrosivity requirements
  • Ensures safety and meets regulatory requirements
  • Suitable for hazardous/classified environments

Field of Application

  • Chemical: reaction monitoring, blending, catalysis, feed and final product monitoring
  • Polymer: polymerization reaction monitoring, extrusion monitoring, polymer blending
  • Pharmaceutical: API reaction monitoring, crystallization, polymorph, blending
  • Oil & Gas: fuel blending, fuel characterization

Features and Specifications

Measuring principle

Laser wavelength
532 nm, 785 nm, 1000 nm

Spectral coverage
150-4350 cm-1 (532 nm)
150-3425 cm-1 (785 nm)
200-2400 cm-1 (1000 nm)

Maximum laser power into probe
<499 mW

Sample interface
WetHead Mini:
316L stainless steel: –30° to 120°C
C276 Alloy: –30° to 150°C
Grade 2 Titanium: –30° to 150°C

WetHead Max:
316L stainless steel : –30° to 120°C
C276 Alloy: –30° to 280°C
Grade 2 Titanium: –30° to 300°C

ANSI B16.5 and DIN EN1092 Type B flanges available upon request

Relative humidity
up to 95%, non-condensing

316L stainless steel: Up to 370 psi
C276 Alloy: up to 650 psi
Grade 2 Titanium: up to 150 psi

Wetted materials
Metal: C276 Alloy, 316L stainless steel, or Grade 2 Titanium 

Window: High-purity sapphire

Fiber optic cable
Design: PVC jacketed, proprietary construction
Connections: proprietary electro-optic
Temperature: –40 to 80°C
Length: 5000 mm (16.4 feet) standard, custom lengths available
Minimum bend radius: 152.4 mm (6 inches)

Immersible Length (mm)
WetHead Mini: up to 36
WetHead Flange and WetHead Max: up to 457 (up to 350 for Grade 2 Titanium)

Diameter (mm)
12.7, 19.05, 25.4 (available as options)
Additional configurations available upon request

Hazardous Area Certifications
ATEX, North American, IECEx

Documents/ Manuals/Software


Application Notes:

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IFPAC-2021 (February 28 – March 5, 2021)

Join us for our three virtual presentations at IFPAC-2021:

March 1st at 1-5:30 PM EST – SmartRaman spectroscopy for automated monitoring and control of industrial processes

March 2nd at 1-5:30 PM EST – Tips and tricks to make process Raman spectroscopy a success

March 4th at 7:45-11:00 AM EST – Raman spectroscopy for automated monitoring and control of bioprocesses

Register today

bIO-PRO KS 785 Installed Lab with operator


2020 Pharma Innovation Award

Our Kaiser Raman bIO-PRO, KS bioprocessing probe was recently selected as a 2020 Pharma Innovation Award winner by Pharma Manufacturing Magazine!

The Kaiser Raman bIO-PRO, KS probe provides fast, accurate measurement of key bioprocess variables from lab-to-process. It is an exciting advancement in our already well-established Kaiser Raman bioprocess product portfolio.

Read the award announcement

Pittcon 2021 virtual conference


2021 Pittcon Conference & Expo (March 8-12, 2021)

Join us during our two virtual presentations at the 2021 Pittcon Conference & Expo:

March 8th at 1:30 PM EST – The Role of Process Raman Spectroscopy in Chemical and Polymer Applications

March 12 at 9:30 AM EST – Analytical Model Development for Raman Spectroscopy of Pharmaceutical Solids Processing and Upstream Bioprocessing

Register today