Viavi Solutions



Viavi Solutions® continues to drive spectrometer innovation with the new MicroNIR PAT-U process spectrometer. It is a rugged, scalable, next-generation system for real-time process monitoring in food and pharmaceutical process analytical technology (PAT) applications. With proven Viavi linear variable filter (LVF) technology, the PAT-U has the smallest form factor on the market in a fit-for-purpose design. This makes it ideal for use with processing equipment of all sizes, with the performance and stability to enable truly efficient manufacturing.

The easy-to-use MicroNIR PAT-U was designed for today’s demanding GMP-regulated environments yet requires minimal system maintenance. It has no moving components or expensive fiber optic cables, enabling superior instrument stability and performance in harsh process environments. Its stainless steel exterior resists dust and water to IP65 standards and cleans easily.

MicroNIR Software
The software suite allows for deployment flexibility from process/ product development to manufacturing  environments and features audit trails, comprehensive user management, encrypted secure data storage, and many other capabilities required for regulated GMP environments.

The instrument control software enables easy data acquisition, method investigation, real-time analysis, user management, method development, and instrument qualification per USP 1119 criteria

Viavi Unscrambler® X Lite regression and classification software provides a complete set of chemometric tools for calibration model development and data investigation

Mounting and Process Integration
The MicroNIR PAT-U has been designed with maximum flexibility in mind to meet the many different criteria for process integration. It integrates into a process with three different mounts:

This includes a modified DN90 flange, a 2” sanitary (hygienic) flange mount, a sapphire window, and a retaining ring with O-rings. The modified DN90 flange is welded into a hole cut in the specific process equipment and then the sanitary flange mount, window, and retaining ring are assembled. The PAT-U with an adjustable collet then secures against the window and a sanitary flange using a standard tri-clover clamp (or C-clamp).  All pieces disassemble for easy cleaning and maintenance.

This mount lets a user weld a mount into the process equipment and subsequently attach the PAT-U using the threaded tip of the spectrometer. The threaded mount also contains a removable window for easy cleaning and maintenance.

- Pharmaceutical Manufacturing
- Fluid bed drying
- Granulation
- Content uniformity
- Food and Feed Manufacturing
- Moisture content
- Nutritional assay
- Protein
- Fat
- Industrial Processing
- Reaction monitoring
- Polymers
- Petrochemicals


  • Non-invasive, real-time NIR analysis
  • Washable, IP65 rated enclosure
  • USB communication
  • Compact for easy integration


Illumination source
Two integrated vacuum tungsten lamps
Bulb life
>40,000 hr
Illumination geometry
Flood illumination/ 0° observer
Input aperture dimensions
2.5 x 3.0 mm
Sample working distance
0 – 15 mm from window
Dispersing element
Linear variable filter
128 pixel InGaAs photodiode array
Pixel size/pitch
30 μm x 250 μm/50 μm
Wavelength range
950 – 1650 nm (10,526 – 6060 cm-1)
Pixel-to-pixel interval
6.2 nm for 950 – 1650 nm
Spectral bandwidth (FWHM
<1.25% of center wavelength (1% typical) (for example, @1000 nm, resolution is <12.5 nm)
Analog-to-digital convertor
16 bit
Dynamic range (Max)
Measurement time (typical)
0.25 – 0.5 sec
Integration time
10 ms typical, minimum 10 μsec, maximum limited by dark signal
Computer interface
USB 2.0
Spectrometer weight
318 g (11.2 oz) with window collar; 368 g (13 oz)
45 mm diameter x 69 mm tall
USB powered (<500 mA @5 V)
Data format
Encrypted, Unsb, CSV, and SPC output
Software included
MicroNIR OnSite, Unscrambler X Lite, MicroNIR Pro
Operating system
Windows 8.1, 8, and 7
Operating temperature
0 – 40°C (noncondensing)
Stainless steel 316: dust and waterproof, sealed and cleanable to IP65 standard
Adaptable stainless steel tri-clover mount, screw into welded flange