The MicroNIR PAT-W spectrometer is a fit-for-purpose near-infrared (NIR) analyzer for quality-by-design (QbD) manufacturing. The spectrometer is a sturdy, scalable, next-generation system for real-time process monitoring in blend homogeneity, content uniformity, loss on drying, roller compaction, and similar process analytical technology (PAT) applications. With the well-established Viavi linear variable filter (LVF) technology, the PAT-W has the smallest form factor among commercial process monitoring instruments in a fit-for-purpose design. This makes it ideal for use with processing equipment of a variety of sizes, with the stability and performance to facilitate efficient and smart manufacturing. 

The user-friendly MicroNIR PAT-W was engineered to handle today's challenging GMP-regulated environments yet requires minimal system maintenance. There are no expensive fiber optic cables or moving components, enabling superior instrument stability and performance in challenging process environments. Its stainless steel/brushed aluminum case is water and dust resistant according to IP65/67 standards.

Key Features

The key features of the MicroNIR PAT-W spectrometer are as follows:

  • Non-destructive, non-invasive, and real-time near-infrared analysis

  • User-selectable Ethernet or Wi-Fi for data communication and system control

  • User-replaceable, rechargeable Li-ion battery with over eight hours of uninterrupted run time

  • Integrated PC enables fast and secure store and forward of spectral data

  • Incorporated multi-axis orientational triggering

  • Trigger options for a variety of applications: push button, OPC and external photosensor

  • Real-time moving block standard deviation (MBSD) analysis for endpoint determination in granulation, blending, drying, and coating processes

  • Washable, IP65/67-rated enclosure


Applications of the new MicroNIR PAT-W spectrometer include:

  • Pharmaceutical Manufacturing
    • Blend & content uniformity
    • Fluid bed drying
    • Granulation
  • Food and Feed Manufacturing
    • Moisture content
    • Nutritional assay
    • Protein, fat & fiber
  • Industrial Processing
    • Polymers
    • Reaction monitoring
    • Petrochemicals

MicroNIR Software

The included MicroNIR Pro software suite has features for data acquisition, calibration and method development, user management, and real-time prediction. MicroNIR Pro can build and apply complete chemometric models using regression and classification algorithms including PLS, Moving Block, SMV, and PCA analyses. Batch mode predictions on stored data are also supported.

Options include an enhanced OPC interface for integration with process control systems and prediction engine add-ins for Camo Unscrambler, Eigenvector Research Solo Predictor and Sartorius SIMCA chemometric software.

Mounting and Process Integration

VIAVI offers multiple options for interfacing the PAT-U to process equipment via standard sanitary flanges and weld-in flanges with a sapphire process window that separates the MicroNIR from the material being analyzed.


This includes a weld in base flange, a 2” sanitary (hygienic) flange mount, a sapphire window, and a retaining ring with O-rings. The base flange is welded into a hole cut in the lid of a blender and then the sanitary flange mount, window, and retaining ring are assembled. Next, the PAT-W with an adaptable collet is secured against the window and a sanitary flange using a standard tri-clover clamp (or C-clamp). All pieces can be dismantled for easy cleaning and maintenance.


The threaded mount allows a user to weld a mount into the process equipment and then link the PAT-U using the threaded tip of the spectrometer. This mount also has a removable window to allow easy cleaning and maintenance.

Standard lid mount kit with weld-in flange 

The PAT-W has an integrated nine-axis inertial measurement unit (IMU) that consists of a three-axis gyroscope, a three-axis magnetometer, and a three-axis accelerometer. The IMU enables highly accurate and repeatable triggering of spectral acquisition by the PAT-W when mounted on a rotating blender.


To learn more please visit the official website.