R301 and R501 Remote Airborne Particle Counters

0.1 CFM (2.83 LPM)

The R301 and R501 particle counters provide a range of particle size measurement from 0.3 or 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.

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Measures 0.3 μm to 25.0 μm

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

Alarm light

LED Indicators

Seamless integration into a facility monitoring system

Lightweight stainless steel enclosure

1 year limited warranty. Extended warranties available.

Size Range	0.3 μm to 25.0 μm
Size Channels	Factory calibrated at 0.3, 0.5, 1.0, and 5.0 μm
Number of Channels	4 channels
Counting Efficiency	50% @ 0.3μm; 100% for particles > 0.45 μm per JIS
Flow Rate	0.1 CFM (2.83 LPM)
Concentration Limits	10,000,000 particles/ft3 @ 10% coincidence (per ISO 21501-4),
	20,000,000 particles/ft3 @ 10% coincidence (as tested and validated1)
Light Source	Long life laser diode
Zero Count	<1 count / 60 minutes (<1 particles / 6 ft3). No fault count subtraction.
Calibration	NIST traceable
Vacuum Requirements	External vacuum > 15” (38.1cm) of Hg
Airflow	Internally monitored
Alarm	User configurable alarm light
Communication Modes	MODBUS™ RTU or ASCII outputs (over isolated RS-485)
Standards	ISO 21501-4 and JIS B9921
Instrument Calibration	Recommended minimum once per year
External Surface	Stainless 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
Weight	1.65 lb. (0.75 kg)
Accessories	Wiring Connector, operating manual on USB flash drive
Optional Accessories	Power Supply, Remote Mounting Bracket, Stainless Steel Barbed Isoprobe (0.1 CFM/2.83 LPM), Filter Assembly, and Sample & Vacuum Tubing
Sample Time	1 second to 18 hours
Power	9 - 24 VDC (< 2.5 watts)
Operating Conditions	41° to 104°F (5° to 40°C) / 20% to 95% non-condensing
Storage Conditions	32° to 122°F (0° to 50°C) / Up to 98% non-condensing
Warranty	1 year limited warranty. Extended warranties available.