MicroNIR PAT-U – Viavi (NIR)

The MicroNIR PAT-U is a USB-powered NIR spectrometer. It is a rugged, scalable, next-generation system for real-time process monitoring in food and pharmaceutical Process Analytical Technology (PAT) applications. It is the smallest of its kind on the market making it suitable for use on equipment of different sizes as well as implementation of multiple of the analysers on a given process.

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

ATEX certified version of PAT-U is also available!

MicroNIR PAT-U process spectrometer 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 USB Powered Spectrometer 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.

Key Features

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


Pharmaceutical Manufacturing

  • Fluid bed drying
  • Granulation
  • Content uniformity

Food and Feed Manufacturing

  • Moisture content
  • Nutritional assay
  • Protein
  • Fat


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.



Illumination source

Two integrated vacuum tungsten lamps

Bulb life

>40,000 hours

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 second

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 or (13 oz)


45 mm diameter x 69 mm tall


USB powered (<500 mA @5V)

Data format

Encrypted, Unsb, CSV, and SPC output

Operating system

Windows 8.1, 8, and 7

Software available

MicroNIR Pro standard, Unscrambler X Lite, MicroNIR Process

Operating temperature

0 – 40 deg C (non-condensing)


Stainless steel 316: dust and waterproof, sealed and cleanable to IP67 standard


Adaptable stainless steel tri-clover mount, screw into welded flange

Click Here to download MircoNIR PAT-U Data Sheet

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Home > MicroNIR PAT-U – Viavi (NIR)

Location: IRELAND

Unit 21, Waterford Business Park,

Cork Road, Waterford

Ireland, X91 P224

Tel: +353 (0)51 392 391

E-mail: info@antech.ie

Contact: UK

Tel: +44 (0)20 346 898 13

E-mail: info@antechsolutions.co.uk

Web: www.antechsolutions.co.uk