Remote Particle Counter Model P231

SKU P231

The Airy Technology P231 remote particle counter measures 0.5 µm and 5.0 µm with a flow rate of 1.0 CFM (28.3 LPM). Integration is easy into a real-time monitoring or building management system via Modbus™ RTU or Modbus™ ASCII.
The P231 is the smallest remote particle counter in the market and has easy mounting options.
The Airy Technology P231 complies with ISO 21501-4 and includes a 2 year limited warranty.


  • World’s smallest 1 CFM remote particle counter
  • Measures 0.5 µm and 5.0 µm
  • 1.0 CFM (28.3 LPM) flow rate
  • Measures 2 channels of simultaneous data
  • Long life laser diode
  • Modbus™ RTU or Modbus™ ASCII outputs
  • Concentration limit of 500,000 per ft³
  • Complies with ISO 21501-4 and JIS B9921 standards
  • Lightweight stainless steel enclosure
  • Easy to clean and wipe down
  • 2 year limited warranty

Channel Sizes

0.5 µm and 5.0 µm

Counting Efficiency

50% at 0.5 μm; 100% for particles > 0.75 μm

(per JIS)

Concentration Limit

500,000 particles / ft3 at 5% coincidence loss

Light Source

Long Life Laser Diode

Zero Count Level

<1 count / 5 minutes (per JIS B9921)

Size Resolution

<15% at 0.7 μm (per ISO 21501-4)

Flow Rate

1.0 CFM (28.3 LPM)

Flow Control

Critical orifice

Vacuum Requirements

External vacuum >15” (38.1 cm) of Hg


NIST traceable

Sample Probe/Tubing

Isokinetic sampling probe

Communication Interface

Modbus™ RTU or Modbus™ ASCII outputs

(specified upon order)


9-30 VDC

Dimensions (L x W x H)

1.8” x 3.7“ x 1.5” (4.5 cm x 9.3 cm x 3.8 cm) does

not include probes


0.62 lb (0.28 kg)


ISO 21501-4 and JIS B9921


2 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

Included Accessories

User manual

Optional Accessories

Purge filter, data cable, vacuum and sample

tubing, Isokinetic sampling probe



Datasheet : P231