Fiber Optic Probes
for Inline Spectroscopy

ColVisTec offers advanced Fiber Optic Probes designed for continuous in situ monitoring of industrial processes. Our product line includes various distinct Probes to cover a wide range of applications. All of our probes are specifically engineered to withstand harsh environmental conditions, ensuring reliable performance even in challenging industrial settings.
They are suitable for diverse industries — from plastics and polymers, paint, food, and pharmaceuticals to chemical manufacturing — our probes provide versatile measurement options. Depending on the properties of the material, UV-Vis and NIR Probes can be used in Reflection Mode for Opaque Materials or in Transmission Mode for Transparent Materials, allowing precise, continuous monitoring of product quality and critical process parameters to maximize efficiency, stability, and reproducibility.

---

UV/Vis or NIR
Reflection Probes

The reflection probe — also defined as Reflection Polymer Melt Probe (RPMP) — is available in two versions: as a UV/Vis or NIR probe. Depending on the application, these can be combined with Inline-Spectrometer InSpectro X (UV/Vis) or with the Inline-Spectrometer InSpectro NIR.
Designed for opaque media, it is used for a variety of applications in R&D as well as directly in production plants, for example in the reflection measurement of plastic melts in extruders.
The RPMP consists of a probe body and a detachable fiber optic. The probe is positioned in the material flow at a suitable point in the medium with laminar flow. The light is transmitted via six fibers arranged in a ring and the portion of the light reflected by the medium is detected via a centered fiber.
As the fiber optics are removable, calibration can be carried out outside the installation situation using an external calibration adapter without interrupting the ongoing process.
This probe is specially designed to withstand the high temperature and pressure often found in extruders, though it can also be installed in other types of manufacturing machinery.

(1) The RPMP probe installed on (2) the extruder. For example, in the die-plate.

Reflection Probe Technical Data

---

UV/Vis or NIR
Transmission Probes

The transmission probe — Transmission Polymer Melt Probe (TPMP) — is available in two versions: as a UV/Vis or NIR probe. Depending on the application, these can be combined with the Inline-Spectrometer InSpectro X (UV/Vis) or with the Inline-Spectrometer InSpectro NIR.
Designed for transparent/clear media, it is used for a variety of applications in R&D as well as directly in production plants, for example in the transmission measurement of plastic melts in extruders.

The TPMP consists of two probe sleeves and two detachable fiber optics, which are installed directly opposite each other (aligned) in the material flow. One probe emits the light and the other detects the light, which records the characteristics of the medium to be measured (spectra).

As the fiber optics are removable, calibration is also possible outside the installation situation using external calibration adapters and spacers without interrupting the ongoing process. Alternatively, it is also possible to calibrate to air or the medium in the installation situation.

Transmission Probe Technical Data

---

Color Probe (CP)

The Color Probe (CP) is an accessory for use with the ColVisTec Inline Color Spectrophotometer InSpectro X. It is specifically designed for reflected color measurements in direct contact with the sample. The CP is suitable for liquid, suspension / paste or powdery media, such as paints, printing inks, granulates, etc.
The CP body of stainless steel is designed to fit a standard 0.75-inch compression fitting.

Our Color Probe is usually used in Extruders where opaque liquids, paste, powder, or pellet materials are processed.

Color Probe Technical Data

---

2-in-1 Combined Probe with
UV/Vis and NIR Fibers

The Combined Probe is a unique accessory for use with the ColVisTec’s Inline Spectrometer InSpectro X and InSpectro NIR. It is specifically designed to perform UV/Vis and NIR simultaneous measurements from a molten polymer stream in an extruder. Combining these two spectroscopy techniques is particularly powerful in process optimisation and provides remarkable process insights.
Again, the Combined Probe consists of a single probe body that can be permanently installed into the extruder, and a removable dual-fiber assembly that transmits and receives UV-Vis and NIR light from the sample at the same time and position in the process.

The Combined Probe is specificially designed for production processes to measure UV/Vis and NIR spectroscopy at the same measurement point. It can be used in the polymer, paint, pharma, food or chemical industry due to the standard thread for an easy implementation into the process.

2-in-1 Combined Probe Technical Data

---

Raman Inline Probe

The Raman Fiber Optic Probe is specifically designed to be used in combination with ColVisTec's Inline-Spectrometer InSpectro R , bringing high-performance Raman spectroscopy directly into the process. Built around a robust stainless steel body with an adhesive-sealed quartz window at the tip, the probe operates reliably under industrial conditions, withstanding working temperatures from −30 °C up to 350 °C (and up to 400 °C under special conditions). Like all ColVisTec probes, it mounts via the standard ½"-20 UNF (Dynisco®) thread, so it fits directly into extruder die-plates, adapters, flanges, reactors, or other process equipment — without requiring custom machining. Operating in reflection mode with a single probe, it features two dedicated fibers — one for laser excitation at 785 nm (105 μm, 0.22 NA) and one for signal collection (200 μm, 0.22 NA). The standard fiber optic length of 1.5 m, terminated with an industry-standard FSMA 905 connector, allows seamless integration with the InSpectro R spectrometer for continuous, non-destructive molecular fingerprinting directly in the production stream.

Raman Probe Technical Data

---

Do you have any questions?