Compact NIR spectrometer for process control

NIR Process Spectrometer microNIR PAT-U

The MicroNIR PAT-U is the most compact spectrometer of the proven MicroNIR PAT series. It is easily installed via USB, a separate power supply is not necessary. The PAT-U can operate as a reflectance spectrometer in contactless mode at a sapphire glass window port or in direct sample contact via an extension immersion probe. It cost-effectively and reliably monitors chemical reactions in real time.


  • Robust process probe with IP protection class 67.
  • Proven Linear Variable Filter technology with no moving parts inside.
  • Maintenance-free system with long-life tungsten lamps for cost-effective use.
  • Includes MicroNIR PRO software for model generation (PLS, PCA, MBSD, SMV) and spectrometer control.
  • GMP-compliant (USP<1119>, EP2.2.40, 21CFRp11) validation documents.
  • Also available as ATEX version for safe use in EX zone 0 (20).

Areas of application

  • Reaction monitoring in real time
  • Drying and granulation processes
  • Tabletting
  • Classical chemical reaction monitoring

What makes the PAT-U so unique?

The compact dimensions allow installation even in difficult places. Connection is possible via typical industrial ports in various inch sizes. Alternatively, separately available weld-in kits can be used. Due to the design without optical fibers and moving parts inside, the spectrometer is very robust. It operates via USB without a separate power supply. With the included software for model building, the spectrometer is quite inexpensive.

How does the MicroNIR PAT-U work?

The MicroNIR PAT-U works with near-infrared or NIR spectroscopy. This established laboratory method has been adapted for the compact sensor: Energy is irradiated in the form of light onto the analyte (solid, liquid) under investigation. This light is somewhat lower in energy than the visible range of sunlight and excites the molecules to vibrate. The radiation reflected by the analyte is analyzed. It provides an indication of the structural composition, since some of the incoming radiation is absorbed in a molecule-specific manner. More about NIR spectroscopy.

Feasibility studies & chemometric support

Process analysical technologies benefit those who use a first-class spectrometer and create reliable chemometric models.
We provide support in evaluating the feasibility of analytical issues, e.g. with trial measurements in our laboratory or at the customer's site.

For more detailed studies or complete chemometric modeling, we work with partners who are absolute experts in this field, e.g. S-PACT from Aachen or LabCognition from Cologne.

In this way, customers receive a complete package to get off to a successful start in PAT.

Technical details
Technology Destruction-free NIR spectroscopy
Dispersive element Linear Variable Filter
Operating modes Refexion, transflexion, transmission
Detector 128 pixel InGaAs photodiode array
Weight 318 g
Size 45 mm x 45 mm x 69 mm
Illumination source 2 vacuum tungsten lamps with > 40,000 h lamp life
Spectral range 950 nm – 1,650 nm (= 10,526 cm-1 – 6,060 cm-1)
Resolution Appr. 1.25 % (FWHM)
Dynamic range 1,000 : 1 max.
Signal-to-noise ratio (SNR) 1 : 23,000
Working distance 0 – 15 mm
Connectivity USB
Power USB (< 500 mA at 5 V)
Data formats Unsb, CSV and SPC
Operating temperature 0°C until + 40 °C (non-condensing)
Robustness IP67 dust and water protection, MIL-PRF-28800F class 2
Software MicroNIR Pro software for chemometric modelling, measurements, user and device management
Included accessories 99% spectralon reference standard
Transport case
USB cable
Software: 21 CFR Part 11, USP und EP compliant MicroNIR Software Suite 3.0
Optional accessories Notebook, toughbook or tablet with WIN 10 PRO and pre-installed software
Flow cell bypass for transparent liquids
10 cm extended probe for installation with direct sample contact
Several mounting kits for installation
Cooling coil for high temperature processes

Transmission module
For easy measuring of transparent analytes in standard measuring cuvettes.
>> more information

Mounting kits
Various mounting and adapter kits for the installation of MicroNIR PAT spectrometers into the process equipment. Available as adapters (1.5", 2.0", 2.5", 3", 4") for plants with existing accesses or as mounting kits with weld-in parts, such as the Blender lid mounting kit.
>> more information

Extension probe
10 cm probe extension for measurement with sample contact directly in the process, e.g. in the feed frame during tabletting.
>> more information

Flow cell
Flow cell with Swagelok connection for transflexion measurement of liquids at integrated sapphire glass viewing window.
>> more information

Reference standards
Various photometric standards (wavelength, reflectance) for IOPQ check.

Cooling sleeve
Water-cooled sleeve for temperature control in high-temperature processes.

Do you have questions?

Are you interested in the MicroNIR PAT-U?
Our team of experts is here to advise you and discuss your needs.