Indoor Air Quality Monitors 7301-AQM1 and 7301-AQM2 (CO2, Temp, RH, and TVOC)

Article: 7301-AQM1


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).



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 amd 7301-AQM2 ensure compliance and accuracy with an on-board pulse height analyzer.

Datasheet 7301AQM/7302AQM

Features and Benefits

  • Measures 0.3 μm to 25 μm
  • 0,1 CFM (2.83 LPM) or 1.2 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.


Models 7301-AQM1 and 7301-AQM2
Size Range 0.3 to 25 μm
Size Channels Factory calibrated at 0.3, 0.5, 1.0, 2.5, 5.0, 10.0 μm variable binning
Flow Rate / Accuracy 0.1 CFM (2.83 LPM) / +/- 3% or 1.2 LPM
Aerosol Concentration Range 0.01 to 20,000 μg/m³
Light Source Long life laser diode
Resolution .00003 μg/m3
Zero Stability No appreciable drift
Count Modes Real-Time Meter and graph, cumulative/differential count/m³ and count/ft³, and mass concentration (PM)
Log Interval Minimum 1 second with no hold time, maximum 99 hours
Calibration NIST traceable
Display 4.3″ (10.9 cm) WQVGA (480×272) color touch screen
Printer (Optional) External thermal printer available
Internal Vacuum Pump Internal pump with automatic flow control
Filtered Exhaust Internal HEPA filter
Number of Channels 6
Custom Size Channels Calibration for custom size channels available
Audible Alarm Adjustable built-in alarm
Communication Modes Ethernet, USB. (Optional) Wireless 802.11 b/g, RS485 or RS232.
Environmental Sensors 7301-AQM1 Includes 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-AQM2 Includes 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
Alarm Alarms on counts for all particle sizes, low battery, sensor failure, environmental sensors and flow
Standards ISO 21501-4 and JIS B9921
Instrument Calibration Recommended minimum once per year. Gases, temperature and humidity sensors field calibratable.
External Surface Stainless 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
Weight 4 lb (1.8 kg)
Accessories Operating Manual and IMS Software on USB flash drive, isokinetic probe, temperature relative humidity sensor, purge filter, battery, USB cable, and power supply
Optional Accessories Calibration 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 Storage 45,000 sample records (rotating buffer) includes particle count data, environmental data, locations, times and annotations, scrollable on screen or printout
Sample Time 1 second to 99 hours
Power 110 to 240 VAC 50/60 Hz universal in-line power supply
Operating Conditions 41º to 104ºF (5º to 40ºC) / 20% to 95% non-condensing
Storage Conditions 32º to 122ºF (0º to 50ºC) / Up to 98% non-condensing
Warranty 2 year limited warranty. Extended warranties available.