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Particles Plus® 7301-AQM1 and 7301-AQM2 Series Remote Particle Counter and Environmental Monitor

CO2, Temp, RH, and TVOC

The Particles Plus® 7301-AQM1 and 7301-AQM2 Series Remote Particle Counter and Environmental Monitor measures 0.3 to 25 µm particles with mass concentration and stores indoor air quality measurements of temperature, relative humidity, CO2, (and TVOC in the 7301-AQM2). This instrument is the most versatile remote Air Monitor available, with advanced power management and the industry’s first sleep mode, allowing for battery operation of periods that can exceed a month on a single charge. The AQM Series can be used as a stand-alone battery operated instrument or it can be easily integrated into a building automation and facility monitoring system via Ethernet, USB or (optional) Wireless 802.11 b/g, RS485 or RS232 connection.

The AQMs reports and displays 6 user-selectable particle size channels, as well as carbon dioxide (CO2), temperature, and relative humidity. The model 7301-AQM2 includes a PID Sensor for TVOC. The instrument monitors PM1, PM 2.5, PM5, PM 10 & TPM (and any other PM size value the user specifies) with an easy-to-use Channel Management control panel. The instrument also monitors flow, sensor status, date of last calibration, serial number, laser on-time, and date of manufacture for easy maintenance and warranty management.

User friendly field calibration for the integrated environmental sensors allows for single or dual point offsets, and ensures accuracy for air quality investigations. View data and generate environmental reports real-time on screen, via printer or USB key, or export to Particles Plus® Instrument Management Software. Particles Plus® instruments can be controlled and monitored remotely via web browser from any PC, tablet or smartphone supporting 20 concurrent user sessions.

The 7301-AQM1 and 7301-AQM2 store up to 45,000 time stamped particle count and environmental data records which provides data redundancy on every instrument. The AQMs mass concentration mode approximates density in µg/m³ and allows for density and refractive index corrections to ensure accuracy. All Particles Plus® counters meet ISO 21501-4 and JIS B9921. The 7301-AQM1 and 7301-AQM2 ensure compliance and accuracy with an on-board pulse height analyzer. 

Have questions? Call +61 2 9622 6327



Measures 0.3 μm to 25 μm
0.1 CFM (2.83 LPM) flow rate
Large easy-to-use icon driven color touch screen display
Approximates mass concentration in μg/m3 and indicates simultaneous PM values
User-selectable, adjustable particle channel sizes
7301-AQM1 measures CO2, temperature, and humidity. The 7301-AQM2 includes TVOC.
Stores up to 45,000 sample records
Connect using Ethernet, USB or (optional) Wireless 802.11 b/g, RS485 or RS232
Static or dynamic IP address (DHCP) connects to a local network or the Internet
Seamless integration into a facility monitoring system with MODBUS RTU, ASCII or TCP
Internet of Things JSON output allows for cloud based data storage and retrieval
Included software permits remote operations, data management, diagnostics and more
Displays and externally prints information with optional printer
Internal audible alarm with user selectable thresholds for all environmental parameters
Advanced power management for long battery operation and patented sleep mode
Easy configuration and transferable from instrument to instrument
User friendly field calibration with single or dual point offsets for all sensors
Remote diagnostics allows for remote service investigation through the Internet
Lightweight stainless steel enclosure
Long life laser diode technology
2 year limited warranty, extended warranties available.
Models7301-AQM1 and 7301-AQM2
Size Range0.3 to 25 μm
Size ChannelsFactory calibrated at 0.3, 0.5, 1.0, 2.5, 5.0, 10.0 μm variable binning
Flow Rate / Accuracy0.1 CFM (2.83 LPM)
Aerosol Concentration Range0.01 to 20,000 μg/m³
Concentration Limits30,000,000 particles/ft3 @ 10% coincidence
Light SourceLong life laser diode
Resolution0.0003 μg/m3
Zero StabilityNo appreciable drift
Count ModesReal-Time Meter and graph, cumulative/differential count/m³ and count/ft³, and mass concentration (PM)
Log IntervalMinimum 1 second with no hold time, maximum 99 hours
CalibrationNIST traceable
Display4.3″ (10.9 cm) WQVGA (480×272) color touch screen
Printer(Optional) External thermal printer available
Internal Vacuum PumpInternal pump with automatic flow control
Filtered ExhaustInternal HEPA filter
Number of Channels6
Custom Size ChannelsCalibration for custom size channels available
Audible AlarmAdjustable built-in alarm
Communication ModesEthernet, USB. (Optional) Wireless 802.11 b/g, RS485 or RS232.
Environmental Sensors 7301-AQM1Includes NDIR CO2 (0-5000 ppm, resolution 1 ppm, accuracy ±1% FS, Response rate 20 seconds), temperature and relative humidity probe 32º to 122ºF (0º to 50ºC) ±1ºF (0.5ºC), 15-90% ±2% RH
Environmental Sensors 7301-AQM2Includes all sensors in the 7301-AQM1 and TVOC PID (standard on the 7301-AQM2), 0-50 ppm / minimum detection level 5 ppb, accuracy ±1.5%, Response rate <3 seconds
AlarmAlarms on counts for all particle sizes, low battery, sensor failure, environmental sensors and flow
StandardsISO 21501-4 and JIS B9921
Instrument CalibrationRecommended minimum once per year. Gases, temperature and humidity sensors field calibratable.
External SurfaceStainless steel
Dimensions (L x W x H)5.22” x 3.81” x 9.42” (13.3 cm x 9.7 cm x 23.9 cm) includes barb fittings
Weight4 lb (1.8 kg)
AccessoriesOperating Manual and IMS Software on USB flash drive, isokinetic probe, temperature relative humidity sensor, purge filter, battery, USB cable, and power supply
Optional AccessoriesCalibration cap for gas sensor, carrying case, external printer, isokinetic probes, barb fittings, spare battery, external battery charger, printed manual, and IMS-RT monitoring system
Data Storage45,000 sample records (rotating buffer) includes particle count data, environmental data, locations, times and annotations, scrollable on screen or printout
Sample Time1 second to 99 hours
Power110 to 240 VAC 50/60 Hz universal in-line power supply
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 available.


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