2501 Remote Airborne Particle Counter

Particles Plus Remote Particle Counters

 

Model 2501

0.5 – 25.0 µm @ 0.1 CFM

The Particles Plus® 2501 Remote Particle Counter is designed for continuous monitoring in cleanrooms and other controlled environments. With four particle size channels ranging from 0.3 or 0.5 up to 25.0 μm, these instruments deliver targeted contamination detection with real-time data collection and configurable alarms for immediate incident reporting and local visual alerts.

The compact, angled enclosures enable installation in tight locations while minimizing disruption to unidirectional airflow. These sensors have four fixed particle size channels and are equipped with an integral critical orifice and flow sensor to provide a stable flow rate from an external vacuum source.

Built for scalability and long-term reliability, these models utilize durable laser diodes backed by a lifetime warranty and deliver exceptional zero-count performance. The 2000 Series sensors allow for efficient particle counting with specifications that exceed the ISO 21501-4 and JIS B9921 calibration standards.

With seamless connectivity, remote diagnostics, and a standardized architecture, they offer simplified integration and a lower total cost of ownership for critical monitoring applications.

0.1 CFM (2.83 LPM) flow rate
Long life laser diode technology for reliable performance
Measures up to 4 channels of simultaneous data
Accurate in high particle concentration environments
Internal critical orifice provides precise airflow control for consistent measurements
Modbus RTU/ASCII data communication over isolated RS-485
Complies with ISO 21501-4 and JIS B9921 standards
Easy to clean, lightweight stainless steel enclosure with minimal particle traps
Versatile mounting options
User configurable alarm light and LED indicators for real-time alerts
Seamless integration into a facility monitoring system
2 Year Limited Warranty (Extended and Lifetime Warranties available)
Model23012501
Size Range0.3 μm to 25.0 μm0.5 μm to 25.0 μm
Size ChannelsFactory calibrated at 0.3, 0.5, 1.0, and 5.0 μmFactory calibrated at 0.5, 1.0, 2.5, and 5.0 μm
Number of Channels4 channels4 channels
Counting Efficiency50% @ 0.3μm; 100% for particles > 0.45 μm per JIS50% @ 0.5μm; 100% for particles > 0.75 μm per JIS
Flow Rate0.1 CFM (2.83 LPM)
Concentration Limits10,000,000 particles/ft3 @ 10% coincidence (per ISO 21501-4),
20,000,000 particles/ft3 @ 10% coincidence (as tested and validated1)
Light SourceLong life laser diode
Zero Count<1 count / 60 minutes (<1 particles / 6 ft3). No fault count subtraction.
CalibrationNIST traceable
Vacuum RequirementsExternal vacuum > 15” (38.1cm) of Hg
AirflowInternally monitored
AlarmUser configurable alarm light
Communication ModesMODBUS™ RTU, ASCII (over isolated RS-485)
StandardsISO 21501-4 and JIS B9921
Instrument CalibrationRecommended minimum once per year
External SurfaceStainless steel
Dimensions (L x W x H)1.83” x 3.59” x 5.01” (4.6 x 9.1 x 12.7 cm) including probes and connectors
Weight1.65 lb. (0.75 kg)
AccessoriesWiring Connector, operating manual on USB flash drive
Optional AccessoriesPower Supply, Remote Mounting Bracket, Isokinetic Probe, Filter Assembly, and Sample & Vacuum Tubing
Sample Time1 second to 18 hours
Power9 - 24 VDC (< 2.5 watts)
Operating Conditions41-104ºF (5-40ºC) / 20% to 95% non-condensing
Storage Conditions32-122ºF (0-50ºC) / Up to 98% non-condensing
Warranty2 Year Limited Warranty (Extended and Lifetime Warranties available)

Remote Mounting Bracket 2000/9000 Series
Part Number: AS-99081

Filter Assembly
0.1 CFM (2.83 LPM)
Part Number: AS-99002A

Power Supply 12VDC @ 1Amp
100-240 VAC 50/60Hz
Part Number: EE-80148

Isoprobe Barbed 0.1 CFM (2.83
LPM) Stainless Steel
Part Number: PS-12022

Tubing 1/4" OD (1/8" ID)
Bev-A-Line XX per foot
Part Number: AS-99036

Tubing 1/4" OD (1/8" ID)
Urethane per foot
Part Number: AS-99018

Tubing 3/8" OD (1/4" ID) Bev-A-
Line XX per foot
Part Number: AS-99037

Tubing 3/8" OD (1/4" ID) Urethane per foot
Part Number: AS-99019

USB to RS-485 Adapter
Part Number: AS-99088A

2000/2000P
Series with Pump
User Manual (Printed)
Part Number: MN-24028P

2000/2000P
Series Validation
Manual
Part Number: MN-24034

2000/2000P Series
User Manual and PPD-9K Software (USB Key)
Part Number: MN-24028