Product Overview

A Simple On-Line Web Scanner

The Process Sensors Guardian-HD Basic Web Profile Analyzer is a rugged single-scanner system to measure moisture, coat weight, and temperature (optional) for all paper, film, and web-converting processes for both wet-end and dry-end applications.

It provides a non-contact, non-destructive on-line measurement of a complete zoned web profile, helping operators reduce quality issues caused by improper moisture control, including edge curl and lay flat challenges. This translates to improved quality and consistency, less waste, and a quick return on investment.


  • Entry-level functionality for operators to run simple scans on multiple constituents
  • Record data across 16 total measurement zones with up to 50 different recipes (products)
  • Easy calibration, operation, and standardization
  • Pre-programmed software with specific calibrations
  • Easily connect to closed-loop control systems or local alarms
  • 5.7” touch-screen display
  • Optional Ethernet IP, Modbus TCP/IP interface, or OPC server
  • Configurations available to monitor and control multiple Guardian-HD systems simultaneously


  • Minimize edge curl and lay flat issues with 100% real-time inspection of moisture, coat weight, thickness, and temperature of converting lines
  • Decrease manual start-up times by 20%, eliminating the need for time-consuming lab testing and adjustments
  • Each system can be customized to the width of the web, along with the ability to position the NIR sensor wherever it is needed
  • Rugged, sealed industrial frame and linear actuator withstands hot and humid environments
  • Automatic edge detection feature senses roll width to streamline set-up processes, and realigns to accommodate web drift
  • Reduce start-up times and waste by instantly identifying production inefficiencies
Moisture & Compositional


Rugged NIR Scanning for a Complete Zoned Web

Moisture and coat weight measurements can be made on many substrates including paper, film, foil, textiles, release liners, tags, tapes and labels.

The Guardian-HD Web Profiling System is commonly used in the following applications:

  • Hot melt & film thickness
  • Wet end water based coat weight
  • Dry end organic coat weight
  • Exit and inlet dryer moisture
  • Re-moisturizers (LAS, steam curtains and water decks)
  • Moisture and coatings on paper webs
  • Thickness of hot melts
  • Thickness of pressure sensitive adhesives
  • Thickness of water-based adhesives
  • Paper pulp
  • Plastic film thickness
  • Biax film
  • PVB & EVA film
  • Exit and inlet dryer moisture measurement
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Moisture & Compositional


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Moisture & Compositional

How It Works

Entry-Level Functionality for Operators to Scan Multiple Constituents

The Guardian-HD Series features an NIR sensor that is connected to a traversing frame to continually scan the full-width of a web profile for moisture and coat weight parameters. Real-time data is presented on an easy-to-understand touchscreen display for cross direction web profiling, lane and machine direction measurements. In some configurations, larger displays with Windows®-based software are available for monitoring multiple line profiles at a single central console.

All Guardian-HD Series configurations allow for USB data-logging with the ability to export to .csv, .xml or .txt file formats.

Each Guardian-HD frame is custom-built for its specific application, and the analysis software can be pre-programmed for specific recipe codes for the material it is analyzing. The NIR sensor can also be positioned in different ways to accommodate reflective surfaces (common with wet-end coating applications) as well as horizontal, vertical, and under-side scanning.

Moisture & Compositional

System Components

All components of the Guardian-HD Basic are ruggedized and specified to operate for several years in challenging conditions. Unlike nuclear and X-Ray systems, Guardian-HD Basic does not require costly regulation compliance or safety certifications. Each unit is custom-built for its specific application.

System components include:

  • Industrial scanning frame
  • An NIR smart sensor
  • Local, easy-to-read touch screen display with non-Windows® based software
Moisture & Compositional


The Guardian-HD Basic system can be positioned to view material horizontally, vertically, or from the under-side.

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Moisture & Compositional

Food Grade Option

Food Production Applications

The Guardian-HD sensor is available with a food-grade electroless nickel finish and sapphire window (or KEL-F) for food production applications. This allows companies to scan a full array of product entering or exiting a fryer or oven.

Moisture & Compositional


  • Hi / low moisture-only calibration check standards
  • Ethernet IP interface
  • ModBus TCP/IP interface
  • Internally mounted product temperature kit
  • Stack light assembly
  • Background reflector assembly
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Moisture & Compositional


The Guardian-HD Basic is sold standard with non-Windows®-based software that presents data in an easy-to-understand format. The configurations include optional USB raw data-logging capabilities to save and export data to .csv, .xml, or .txt files for additional analysis.

The Guardian-HD Basic is sold standard with non-Windows®-based software that presents data in an easy-to-understand format. The configurations include optional USB raw data-logging capabilities to save and export data to .csv, .xml, or .txt files for additional analysis.

Moisture & Compositional


Power 90-260VA
Number of Constituents Up to 2 (NIR + Product Temperature)
Calibration Codes/Recipes 100
Ambient Temperature 0 – 50°C (32 – 120°F) with air cooling up to 80°C (160°F)
Scanning Frame Outputs 3X 4-20mA Selectable Sources; Live NIR Value; Scan NIR Average Values; Live Temperature Scan & Scan Temperature Average Value
Scanning Frame Inputs Web Break; Web Length; Cooling Air; Sensor Window Purge
Moisture Range Min. 0.1%, Max. 95%
Moisture Accuracy +/- 0.1%
Coatings Range Min. 0.1 GSM, Max. 250 GSM
Coatings Accuracy +/- 0.1 gr/m
Repeatability +/- 0.1%
Moisture & Compositional