9501 Remote Airborne Particle Counter

Particles Plus Remote Particle Counters

Particles Plus RTU9301 cropped

9501 Modbus

0.5 – 25.0 µm @ 0.1 CFM

The 9501 Modbus 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 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.

Measures 0.5 µm to 25 µm
0.1 CFM (2.83 LPM) flow rate
Long life laser diode technology
Measures up to 30 channels of simultaneous data
Particle concentrations up to 10,000,000 Particles/ft3 @ 10% coincidence loss
Internal critical orifice
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
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
Seamless integration into a facility monitoring system
Lightweight stainless steel enclosure
2 year warranty. Extended warranties available.
Size Range0.5 µm to 25 µm
Size ChannelsFactory calibrated at 0.5, 0.7, 1.0, 2.5, 5.0, 10.0 µm
Number of Channels6 channels (up to 30 optional)
Counting Efficiency50% @ 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.
AlarmsChannel alarms on Raw counts, concentrations or mass (alarms on environmental sensors optional)
CalibrationNIST traceable
Vacuum RequirementsExternal vacuum > 15” (38.1cm) of Hg
AirflowInternally monitored
Configuration/DownloadUSB mini-B
AlarmAlarm LED ring
Communication ModesMODBUS™ RTU or ASCII outputs (over isolated RS-485)
Environmental Sensor(Optional) Temp and RH probe 32º to 122ºF (0º to 50ºC) ±1ºF (0.5ºC), 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 5.01” (9.1 cm x 4.6 cm x 12.7 cm) including probes and connectors
Weight1.08 lb. (494 grams)
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 - 24 VDC (< 1.5 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.

Particles Plus 9301 and 9501 Diagram

Accessories 9301 9501