2501 Remote Airborne Particle Counter

Particles Plus Remote Particle Counters

Model 2501

0.5 – 25.0 µm @ 0.1 CFM

The 2501 particle counter provides a range of particle size measurement from 0.5 to 25.0 μm at a flow rate of 0.1 CFM (2.83 LPM). These sensors allow for efficient particle counting with specifications that exceed the ISO 21501-4 and JIS B9921 calibration standards.

These sensors have 4 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. Integration into a building automation or facility monitoring system is easy via isolated RS-485 Modbus communication.

2301: Measures 0.3 um to 25.0 um
2501: Measures 0.5 um to 25.0 um
0.1 CFM (2.83 LPM) flow rate
Long life laser diode technology
Measures up to 4 channels of simultaneous data
Particle concentrations up to 15,000,000 Particles/ft3 @ 10% coincidence loss
Internal critical orifice
Connect using Modbus RTU/ASCII over isolated RS-485
Complies with ISO 21501-4 and JIS B9921 standards
Easy to clean and wipe down with minimal particle traps
Versatile mounting options
User configurable alarm light
LED Indicators
Seamless integration into a facility monitoring system
Lightweight stainless steel enclosure
2 year warranty. Extended warranties available.
Model2501
Size Range0.5 to 25.0 um
Size ChannelsFactory calibrated at 0.5, 1.0, 2.5, 5.0 um
Number of Channels4
Counting Efficiency50% @ 0.5 um; 100% for particles > 0.75 um per JIS
Flow Rate0.1 CFM (2.83 LPM)
Concentration Limits15,000,000 Particles/ft3 @ 10% coincidence loss
Light SourceLong life laser diode
Zero Count< 1 count / 60 minutes (< 1 particles /6/ft3)
CalibrationNIST traceable
Vacuum RequirementsExternal vacuum > 15" (38.1cm) of Hg
AirflowInternally monitored
AlarmUser configurable alarm light
Communication ModesMODBUS™ RTU or ASCII outputs (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)3.59” x 1.83” x 5.01” (9.1 cm x 4.7 cm 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, Stainless Steel Barbed Isoprobe (0.1 CFM/2.83 LPM), Purge Filter Assembly, and Sample & Vacuum Tubing
Sample Time1 second to 18 hours
Power9 - 24 VDC (< 2.5 watts)
Operating Conditions41° to 104°F (5° to 40°C) / 20% to 95% non-condensing
Storage Conditions32° to 122°F (0° to 50°C) / Up to 98% non-condensing
Warranty2 year limited warranty. Extended warranties available.