Airborne Particle Counters

Laser Particle Counter Model Sigma311
Accurate, dependable, user friendly, compact and light weight

  • Occupational Health & Safety
  • ISO Cleanroom Certification (ISO Class 4>)
  • Spot checking within cleanroom environments
  • Particle source identification during filter testing
  • Filter Testing
  • Indoor Air Quality Investigations
  • Quality Control

Sigma311’ s large color display shows cumulative and differential particle counts of 3 particle sizes simultaneously. The middle particle range can easily be changed by a user. Sigma311’ s maximum concentration of 113267 particles/m3 (4,000,000 particles/ft3) and up to 8,000 data set record capabilities is the highest in the market. Data can be checked on the unit display and/or easily downloaded to your PC via USB cable and saved as a CVS file which is transferable to Excel. P311 is accurate, dependable, user friendly, compact and light weight.


  • Range: 0.3 µm & 5.0 µm fixed, and middle channel selectable from 0.5, 1.0, 2.0, or 2.5 µm
  • Superior Maximum Concentration; 113267 particles/m3 (4,000,000 particles/ft3)
  • Large Color Display
  • Cumulative and Differential Count
  • Data Download Software
  • USB for Data Download and Power
  • Streamlined & Lightweight
  • Great Energy Conservation
  • User Friendly, Easy Operation
  • Included Accessories:AC Adaptor, Isokinetic Inlet, USB Cable, Zero Filter, Software 4 x AA Batteries with Charger, Calibration Certificate, Quick Guide, Aluminum Carry Case, Operating Manual on CD
  • Optional Accessories: Carrying Case, Tripod


  • Size Range: 0.3-5.0 µm
  • Channel Sizes: 0.3 µm and 5.0 µm fixed; 0.5, 1.0, 2.0, or 2.5 µm selectable middle channel
  • Counting Efficiency: 50% at 0.3 µm; 100% for particles > 0.45 µm (per JIS)
  • Concentration Limits: 4,000,000 particles / ft3 at 5% coincidence loss
  • Light Source: Laser diode
  • Zero Count Level:
  • Sampling Time: 1 second to 99 minutes 59 seconds (Configurable)
  • Sampling Frequency: 1 to 2000 cycles or continuous (Configurable)
  • Sample Output: Internal HEPA filter
  • Vacuum Source: Internal pump
  • Communication Mode: USB
  • Data Storage: 8000 sample records
  • Display: 3.5-inch 320 x 240 Color LCD
  • Power: DC 5V 0.7A (Mini USB TYPE-B)
  • Battery: 4 x AA
  • Battery Life: Up to 4.5 hours of continuous use (LCD Backlight low, 2400mAh Ni-MH Battery)
  • Dimensions (L x W x H): 178x90x47mm (without isokinetic inlet)
  • Weight: 480g (without batteries)
  • Standards: JISB9921, ISO 21501-4
  • Warranty: 1 year limited warranty
  • Operating Conditions: 5° to 35°C 20% to 95%RH non-condensing
  • Storage Conditions: -20° to 50°C Up to 98%RH non-condensing

ISO Cleanroom Certiÿcation(ISO Class 4>)
Point Measurements at Cleanrooms
Particle Source Investigation
Filter Testing
Indoor Air Quality Investigations
Quality Control