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Particles Plus® 9501P Particle Counter

0.5 – 25.0 µm @ 0.1 CFM

The 9501P IoT 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 6 user-selectable particle size channels (up to 30 channels optional) and are equipped with an internal pump and manifold and do not require an external vacuum source. Integration into a building automation or facility monitoring system is easy via isolated RS-485 Modbus communication, TCP/IP over RJ45, Power over Ethernet, or WiFi (802.11 b/g).

Have questions? Call +61 2 9622 6327



Measures 0.5 um to 25.0 µm
0.1 CFM (2.83 LPM) flow rate
Long-life laser diode technology
Measures up to 6 channels of simultaneous data (30 channels optional)
Particle concentrations up to 15,000,000 Particles/ft3 @ 10% coincidence loss
Internal critical orifice
Internal HEPA filter
User-selectable channel sizes
Stores up to 65,000 sample records for on-board data redundancy
(Optional) temperature and relative humidity probe available
Connect using Modbus RTU/ASCII over isolated RS-485. (Optional) Modbus TCP _x0003_over WiFi, Wired Ethernet, or POE.
Complies with ISO 21501-4 and JIS B9921 standards
Easy to clean and wipe down with minimal particle traps
Versatile mounting options
Alarm light
LED Indicators
Size Range0.5 to 25 µm
Size ChannelsFactory calibrated at 0.5, 0.7, 1.0, 2.5, 3.0, 5.0, 10.0 um Variable binning – user defined channel sizes
Number of Channels6 channels (up to 30 optional)
Counting Efficiency50% @ 0.5 um; 100% for particles > 0.75 um per JIS
Flow rates0.1 CFM (2.83 LPM)
Concentration limit15,000,000 Particles/ft3 @ 10% coincidence loss
Light SourceLong life laser diode
Zero Count< 1 count / 60 minutes (< 1 particles /6 ft3)
Count alarms1 to 9,999,999 counts
CalibrationNIST traceable
Vacuum sourceInternal vacuum pump with HEPA filter
Filtered ExhaustInternal HEPA filter
AirflowInternally monitored
Configuration/DownloadUSB mini-B
AlarmAlarm LED ring
Communication ModesModbus RTU/ASCII over isolated RS-485. (Optional) Modbus TCP over WiFi, Wired Ethernet, or POE.
Environmental Sensor(Optional) Temp and RH probe 32° to 122°F (0° to 50°C) ?1°F (0.5°C), 15-90% ?2% relative humidity
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 5.66” (9.1 cm x 4.6 cm x 14.3 cm) including probes and connectors
Weight1.94 lb. (0.88 kg)
AccessoriesOperating manual on USB flash drive, isokinetic probe, power supply and cable
Optional AccessoriesPrinted manual barb fittings, mounting bracket and sample tubing, IMS-RT monitoring system
Buffer memory65,000 sample records (rotating buffer) including particle count data and environmental data
Sample time1 second to 99 hours
Power9 – 24VDC (< 2.5 watts)
Operating Conditions41º to 104ºF (5º to 40ºC) / 20% to 95% non-condensing
Storage Conditions32º to 122ºF (0º to 50ºC) / Up to 98% non-condensing
Warranty2-year limited warranty. Extended warranties are available.


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