Menu
  • Home
  • Products
    • All Products
    • Health Physics
    • Medical Physics
    • Metal Recycling
    • Monitoring Systems
    • Emergency Response
    • How To Order
    • Connector Types
  • Support
    • Service Center
    • Training
    • Product Videos
    • Webinars
    • Software & Firmware Downloads
    • Rad Pro Calculator
    • Warranty Plans
    • Radiation Resources
    • Field Service Support
  • Documents
    • Product Manuals
    • Detector Reference Chart
    • Response Curves
    • Test Reports
    • Newsletter Archive
    • Technical Articles
    • End User Statement Form
    • Price List
  • Company
    • About Us
    • Ludlum Family of Companies
    • Directions to Facilities
    • Exhibition Schedule
    • ISO 9001 Certificate
    • ISO/IEC 17025 Accredited
    • Radioactive Material Licenses
    • Mobile App Privacy Policy
    • Sales Tax Business Licences
    • Terms & Conditions
    • Export Information
    • Ethics Policies
  • Careers
  • Contact Us
    • Ludlum Headquarters
    • U.S. Contacts
    • International Contacts
    • Sales Contact Form
    • Feedback Form
Ludlum Measurements Logo
(800) 622-0828 (US, CA)
(325) 235-5494
(325) 235-4672



Field Service Support

To search products by model number, enter "m..."
(Ex: Enter "m3" to search for Model 3.)

  • Home
  • Products
    • All Products
    • Health Physics
    • Medical Physics
    • Metal Recycling
    • Monitoring Systems
    • Emergency Response
    • How To Order
    • Connector Types
  • Support
    • Service Center
    • Training
    • Product Videos
    • Webinars
    • Software & Firmware Downloads
    • Rad Pro Calculator
    • Warranty Plans
    • Radiation Resources
    • Field Service Support
  • Documents
    • Product Manuals
    • Detector Reference Chart
    • Response Curves
    • Test Reports
    • Newsletter Archive
    • Technical Articles
    • End User Statement Form
    • Price List
  • Company
    • About Us
    • Ludlum Family of Companies
    • Directions to Facilities
    • Exhibition Schedule
    • ISO 9001 Certificate
    • ISO/IEC 17025 Accredited
    • Radioactive Material Licenses
    • Mobile App Privacy Policy
    • Sales Tax Business Licences
    • Terms & Conditions
    • Export Information
    • Ethics Policies
  • Careers
  • Contact Us
    • Ludlum Headquarters
    • U.S. Contacts
    • International Contacts
    • Sales Contact Form
    • Feedback Form
Health Physics Medical Physics Metal Recycling Monitoring SystemsEmergency Response

All Products

Portable Survey Meters

  • Friskers
  • General Purpose - Digital
  • General Purpose - Analog
  • Computerized
  • Data Loggers
  • Specialized Meters
  • Geiger Counters
  • Intrinsically Safe
  • Ion Chambers
  • Isotope Identifiers
  • microR / microSv Meters
  • Extended Reach microR / microSv Meters
  • Neutron Meters
  • Pocket-Size Meters
  • Scaler-Ratemeters
  • Stretch Scopes

Personal Radiation Meters

No subcategories

Benchtop Meters

No subcategories

Scalers / Counters

No subcategories

Pulsers

No subcategories

Detectors

  • Alpha
  • Alpha-Beta
  • Alpha-Beta-Gamma
  • Beta
  • Gamma GM
  • Gamma Scintillator
  • Low-Energy Gamma Scintillator
  • Neutron
  • Waterproof Detectors
  • Pipe Detectors
  • Sample Counter Heads
  • Sample Holders

Monitoring Systems

  • Area Monitor Controllers
  • Area Monitoring Systems
  • Portal Monitors
  • Monitoring Systems
  • Contamination Monitors
  • Article Monitors
  • Air Monitors
  • Hand & Foot Monitors
  • Body Monitors
  • Vehicle Monitors
  • Scrap Monitoring Systems
  • Laundry Monitors

Ground/Floor Surveying

No subcategories

Sample Counting

  • Sample Counting Systems
  • Scalers / Counters
  • Sample Counter Heads
  • Protean Instrument Alpha-Beta Counting Systems

Tritium Monitoring

No subcategories

NORM Kits

No subcategories

Dosimetry

  • Dosimeters
  • Dosimeter Accessories

Accessories

  • Detector Accessories
  • Handles & Straps
  • Audio
  • Cables, Connectors & Signal Converters
  • Check Sources
  • Instrument Cases

Medical Physics

  • Radiation Safety QA
  • Imaging QA Test Tools
  • CT / MRI QA
  • Mammography QA
  • Ultrasound QA
  • Nuclear Medicine QA & Safety

Emergency Response Kits

  • General Response Kits
  • Medical Response Kits
  • Decontamination Kits

Need Help?

Unsure about which instrument is best for your application?

Find your region's Ludlum representative or dealer.

  • US Contacts
  • International Contacts

OR

Contact Ludlum Sales:

(800) 622-0828 (USA Toll Free)

(325) 235-5494

Newsletter

Subscribe to our customer newsletter! Stay informed about Ludlum products and services, and get helpful support tips.

Please enable the javascript to submit this form

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

hwm-21

Model HWM-21

Small Article Monitor

Features

  • Unique Detector Housing Design to Reduce Radiation Streaming Effects
  • Intuitive and User-Friendly Operating Software
  • Energy Filter Settings to Optimize Discrimination of Background Radiation
  • Export of Measurement/Parameter Data in XML Format via USB
  • Radionuclide Composition Suggestions from Detector Pulse Analysis
  • Access to Historical Measurement Data via Integrated Database

Clearance Monitor for Reliable and Precise Detection of Contamination on Small Items

The Model HWM-21 small article monitor is designed for the measurement and release of small items such as tools, hard hats, personal protective equipment, documents, and measuring instruments.

The standard equipment includes:

  • 2 gamma PVT detectors
  • 15 mm (0.6 in.) lead shielding
  • Two door interlock system with the option to use one door only
  • Easy to clean stainless steel housing
  • Integrated 7 in. touch-screen display
  • Automated measuring process with user guidance
  • Energy filter settings to optimize discrimination of background radiation from licensed material

The Model HWM-21 provides fast and reliable detection of gamma emitting contamination, based on the latest measurement electronics. With the integrated maintenance modules, the system can be updated continuously to keep up its high performance for every measuring task now and in the future.

 

  • Specifications
  • Documents
  • Specifications
  • Documents

Specifications

Standards The monitor is compliant with the following standards:
CE, CSA / UL or EMC, ISO11929
Detectors 2x gamma plastic detectors
Detection volume: > 9.44 L (0.33 ft3)
Direct connection of each detector to the PC via USB
User Software Intuitive software and touch-screen display, fully automated measurement process with user guidance, indications of results and measurement material position on the display. Web based for remote access.
Electronics Integrated illumination in the chamber, status-LED, interlock-relays with interface to external units
Sensors 2 door sensors with interlock
Ext. Dimensions
(H x W x D)
653 x 450 x 460 mm (25.7 x 17.7 x 18.1 in.), incl. handles
Chamber Volume
(H x W x D)
190 x 295 x 370 mm (7.5 x 11.6 x 14.6 in.)
21 L (0.75 ft3)
Shielding Standard: 15 mm (0.6 in.) lead
Option: 30 mm (1.2 in.) lead
Weight Standard: approx. 220 kg (485 lb)
With 30 mm lead: 360 kg (794 lb)
Power Supply External power adapter input 100 - 240 V, 1.6 A max / 24 V, 5 A output

Documents

  • Data Sheet
  • Ludlum Article Monitor Comparison Table

Ludlum Measurements, Inc.
501 Oak Street
Sweetwater, TX 79556
USA

(800) 622-0828 (US & Canada)
(325) 235-5494
(325) 235-4672

All Products

Service Center

Training

About Us

Careers

Ludlum Family

Directions to Facilities

U.S. Contacts

International Contacts

Privacy Policy

Follow Us

LinkedIn

Facebook

YouTube

© 2025 Ludlum Measurements, Inc.