Safety Dawg top Safety Dawg
USA 1 (800) 860-3088 MON-FRI     8 - 5pm PST USA
Like Us On  FaceBook  


Real-Time Handheld Dust Monitor

Two-button user-interface ensures easy dust level monitoring.

Accurate Dust Concentration

Proprietary algorithm provides accurate total suspended particulate (TSP) concentration. The sheath air feature prevents internal contamination and improves accuracy.


Temperature compensated, durable housing and minimal moving parts ensure reliability.

Highly Portable

All-in-one handheld instrument with long-life batteries that fully charge in less than 3 hours.

Environment Profiling

Easy to use software allows programming unique environmental profiles and recording sample data.

Common Applications
  • Industrial/Occupational Hygiene Area Surveys
  • Particulate Matter Studies
  • Immediate spot measurement
  • Aerosol Research Studies


The Sensidyne Nephelometer is an advanced real-time dust monitor accurately measuring dust concentrations using proven light scatter technology. This portable instrument accurately measures and records dust from 1-10,000 μg/m3 with resolution to 1 μg/m3. Sample
modes are selectable between 60 second sample, 15 minute STEL, or continuous sampling.

The Nephelometer has an internal pump drawing samples into the iso-kinetic sampling inlet where they meet sheath air that guides samples past the particle sensor. The sensor is a photo detector that measures laser light scattered by particulates in the sample stream.

The instrument multiplies each measurement by a K-factor and displays the real-time reading on the display of the instrument. After each sample, the K-factor and Environmental Factor Name and STEL, maximum, minimum, and average readings record to the internal data log. When connected to a computer the instrument uploads up to 4,000 data-log records in spreadsheet format.

In addition to high sensitivity and ease-of-use the Sensidyne Nephelometer offers a low cost of ownership, automatic power save, long-life, data-logging, facility monitoring features, and user-replaceable filters.

Real-Time Handheld Dust Monitor
The Sensidyne Nephelometer is easier to use
The Sensidyne Nephelometer is very easy to use! It is highly portable and allows for single-hand operation. The two button operation allows the user to select the sample mode, select the environmental factor, and begin the sample.
Charging Jack Plug Lithium Ion charger module into the jack to charge the batteries.  
Protective Inlet Cover Protects the unit from dust entering inlet during storage.  
Iso-kinetic Inlet Reduces count errors due to mismatched sample flow velocity.  
Flow Adjust Adjusts the flow rate of the unit. Factory set.  
USB Port Connects instrument to a PC for downloading data and unit set-up.  
On/Off Sample Button to turn unit ON and OFF and start new sample.  
Select / Mode Button to select Environment and operation mode.  
Zero Cap Rubber cap used for zeroing instrument  
  • Sheath Air
  • Instant Readings
  • Highly Sensitive
  • Data Logging
  • Extremely Portable
  • Low Cost-of -Ownership
  • Long-Life Internal Pump
  • Site Monitoring PC Program
  • Selectable Sample Modes
  • Automatic Power Save
Monitoring for Dust and Airborne Particulate
The Nephelometer is an analytical instrument used to measure the light-scattering coefficient of atmospheric and indoor aerosols. Depending on design, a Nephelometer inherently has different levels of sensitivity. The main uses of Nephelometers relate to air quality measurement for pollution monitoring, climate monitoring, and visibility.
Types of Dust
  • Heavy Dust

- The layer of dust on furniture and floors

  • Settling Dust
- Particulate's in the air floating around before it turns into heavy dust
  • Suspended Atmospheric Dust
- Minute particles slowly settling or suspended by slight currents
  and existing in varying amounts in all air.

Airborne particles are commonly either biological contaminants, particulate contaminants, gaseous contaminants, or dust.

This chart shows the types and sizes of various particulate contaminants. This information helpful toward understanding the character of particulate pollution inside a building or in the ambient air. It is also useful for understanding the cleanliness level in a controlled environment

Biological contaminants include mold, fungus, bacteria, viruses, animal dander, dust mites, pollen, human skin cells, cockroach parts, or anything alive or living at one time. These are the biggest enemy of Indoor Air Quality specialist because they are contaminants that cause health problems. Levels of biological contamination depend on humidity and temperature that supports the livelihood of micro- organisms. The presence of pets, plants, rodents, and insects will raise the level of biological contamination.




Inhalable particulate
– Particles with an aerodynamic size cut point of 100 microns that deposit in the nose, mouth, pharynx, and larynx.

Thoracic particulate
– Particles with an aerodynamic size cut point of 10 microns and deposit in the trachea and bronchus.

Respirable particulate
– Particles with an aerodynamic size cut point of 4 microns and deposit in the lower portion of the lung sacks or bronchioles.

Sheath Air
What is sheath air and how does it work?

What is Sheath Air and how does it work?
Sheath air is clean filtered air that surrounds the aerosol stream to prevent particulates from circulating or depositing within the optic chamber. Sheath air prevents contamination caused by build-up and deposits, improves response time by containing the sample, and improves maintenance by keeping the optic chamber clean.


From where does Sheath Air come?
The Nephelometer creates the sheath air by passing air through a
zero filter before beginning the sample.

  Copyright © 2016 R-Safe  |  Designed by | Privacy Policy
Safety Dawg Logo is a © Copyrighted image to R-Safe Specialty.