--- title: "Particles Plus Particulate & Dust Monitors | Aethair" description: "Particles Plus 5000- and 7000-series laser particle counters in the Aethair sensor catalog: 7 models with optional CO₂, TVOC, temperature, and RH." url: https://aethair.io/sensors/particles-plus-particulate-dust-monitors/ --- Sensors · Particulate & Dust Monitors # Particles Plus Particulate & Dust Monitors Particles Plus 5000-series remote (fixed-install) and 7000-series benchtop instruments are laser airborne particle counters and air-quality monitors. They count 0.3-25 µm particles across six selectable size channels at 0.1 CFM (2.83 LPM) to ISO 21501-4 / JIS B9921, reporting cumulative and differential counts plus an approximate µg/m³ mass concentration. Temperature and relative humidity are optional throughout; the -AQM1 variants add a CO2 sensor and the -AQM2 variants add a photoionization TVOC sensor. Integrated over Modbus RS-485. [Schedule a call](https://calendly.com/d/ctdd-mkr-v9v/aethair-demo-website) [Build a Configuration](https://aethair.io/build/?params=particle_count,temperature,humidity,pressure,co2,voc) At a glance **6** parameters **7** models [**Connects via Thiamis** RS-232 · Modbus RTU · RS-485 · Modbus RTU](https://aethair.io/products/thiamis/) 4 standards limit what it measures - [LEED v5 LEED v5: Indoor Air Quality Performance (Operations and Maintenance)](https://aethair.io/standards/leed_v5/) - [RESET Air RESET Air: commercial interiors performance targets](https://aethair.io/standards/reset_air/) - [WELL v2 WELL Building Standard v2: Air](https://aethair.io/resources/well-building-standard-air-quality/) - [ACGIH TLV ACGIH Threshold Limit Values (TLV)](https://aethair.io/standards/acgih_tlv/) Measures ## What Particles Plus Particulate & Dust Monitors Measure 6 parameters, each linked to its page: the sensors, units, and standards behind it. [Particle Count (by size) particles / particles/ft³ / particles/m³ / µg/m³ 0.3 µm, 0.5 µm, 1.0 µm, 2.5 µm, 5.0 µm, 10.0 µm](https://aethair.io/parameters/particle_count/) [Air Temperature °C / °F](https://aethair.io/parameters/temperature/) [Relative Humidity %](https://aethair.io/parameters/humidity/) [Barometric Pressure hPa](https://aethair.io/parameters/pressure/) [Carbon Dioxide (CO₂) ppm](https://aethair.io/parameters/co2/) [VOC (Total) ppm](https://aethair.io/parameters/voc/) [Connects via **Thiamis**](https://aethair.io/products/thiamis/) Wired interfaces [RS-232 Modbus RTU](https://aethair.io/products/thiamis/#port-rs232) [RS-485 Modbus RTU multi-drop](https://aethair.io/products/thiamis/#port-rs485 "Addressable multi-drop bus: several units share one connector") Models ## Particles Plus Particulate & Dust Monitors Models 7 models, each with what it measures and the ranges its datasheet gives. | Model | Description | Measures & specs | | - | - | - | | **Particles Plus 5301** | Remote, fixed-install six-channel airborne particle counter (0.3-25 µm at 0.1 CFM) with cumulative/differential counts and an approximated µg/m³ mass concentration; optional temperature and relative humidity. Mains-powered continuous operation with touchscreen; no gas sensors. | [Particle Count (by size)](https://aethair.io/parameters/particle_count/) [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) [Barometric Pressure](https://aethair.io/parameters/pressure/) | | **Particles Plus 5301-AQM1** | Remote air-quality monitor: the 5301 counter plus a CO2 sensor (0-5000 ppm) with temperature and relative humidity. Reports particle counts, µg/m³ mass concentration, and CO2; no TVOC. | [Particle Count (by size)](https://aethair.io/parameters/particle_count/) [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) [Barometric Pressure](https://aethair.io/parameters/pressure/) [Carbon Dioxide (CO₂)](https://aethair.io/parameters/co2/) | | **Particles Plus 5301-AQM2** | Remote air-quality monitor: the 5301-AQM1 plus a photoionization (PID) TVOC sensor (5 ppb-50 ppm). Full particle + CO2 + TVOC + temperature/RH suite. | [Particle Count (by size)](https://aethair.io/parameters/particle_count/) [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) [Barometric Pressure](https://aethair.io/parameters/pressure/) [Carbon Dioxide (CO₂)](https://aethair.io/parameters/co2/) [VOC (Total)](https://aethair.io/parameters/voc/) | | **Particles Plus 7301** | Benchtop six-channel airborne particle counter (0.3-25 µm at 0.1 CFM) with rechargeable battery and low-power sleep mode; cumulative/differential counts and an approximated µg/m³ mass concentration, optional temperature and relative humidity. No gas sensors. | [Particle Count (by size)](https://aethair.io/parameters/particle_count/) [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) [Barometric Pressure](https://aethair.io/parameters/pressure/) | | **Particles Plus 7301-AQM1** | Benchtop air-quality monitor: the 7301 counter plus a CO2 sensor (0-5000 ppm) with temperature and relative humidity; no TVOC. | [Particle Count (by size)](https://aethair.io/parameters/particle_count/) [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) [Barometric Pressure](https://aethair.io/parameters/pressure/) [Carbon Dioxide (CO₂)](https://aethair.io/parameters/co2/) | | **Particles Plus 7301-AQM2** | Benchtop air-quality monitor: the 7301-AQM1 plus a photoionization (PID) TVOC sensor (5 ppb-50 ppm). Full particle + CO2 + TVOC + temperature/RH suite. | [Particle Count (by size)](https://aethair.io/parameters/particle_count/) [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) [Barometric Pressure](https://aethair.io/parameters/pressure/) [Carbon Dioxide (CO₂)](https://aethair.io/parameters/co2/) [VOC (Total)](https://aethair.io/parameters/voc/) | | **Particles Plus 7501** | Six-channel benchtop / remote laser particle counter (0.5–25 µm) at 0.1 CFM (2.83 L/min), with temperature and relative humidity; RS485/RS232/Ethernet. Sits alongside the 7301 in the 7000 series. | [Particle Count (by size)](https://aethair.io/parameters/particle_count/) [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) | Standards ## Standards for What It Measures Standards that set limits on the parameters it reports, plus any method standard the instrument is built to. [LEED v5 LEED v5: Indoor Air Quality Performance (Operations and Maintenance) 2 of its parameters](https://aethair.io/standards/leed_v5/) [RESET Air RESET Air: commercial interiors performance targets 2 of its parameters](https://aethair.io/standards/reset_air/) [WELL v2 WELL Building Standard v2: Air 2 of its parameters](https://aethair.io/resources/well-building-standard-air-quality/) [ACGIH TLV ACGIH Threshold Limit Values (TLV) 1 of its parameters](https://aethair.io/standards/acgih_tlv/) [ASHRAE TC 9.9 ASHRAE TC 9.9: data center contamination and environmental guidelines 1 of its parameters](https://aethair.io/standards/ashrae_tc99/) [Cal/OSHA PEL Cal/OSHA Permissible Exposure Limits (8 CCR §5155, Table AC-1) 1 of its parameters](https://aethair.io/standards/cal_osha_pel/) [UBA CO₂ Indoor CO₂ Guideline (German UBA / Pettenkofer scale) 1 of its parameters](https://aethair.io/standards/uba_indoor_co2/) [ISO 14644-1 ISO 14644-1: cleanroom classification by particle concentration 1 of its parameters](https://aethair.io/standards/iso_14644_1/) [ISO 23875 ISO 23875: air quality control systems for operator enclosures 1 of its parameters](https://aethair.io/standards/iso_23875/) [NIOSH REL NIOSH Recommended Exposure Limits (RELs) 1 of its parameters](https://aethair.io/standards/niosh_rel/) [NYSDEC DER-10 NYSDEC DER-10 Community Air Monitoring Plan (CAMP) 1 of its parameters](https://aethair.io/standards/nysdec_der10/) [OSHA construction OSHA Construction Exposure Limits (29 CFR 1926.55) 1 of its parameters](https://aethair.io/standards/osha_construction_pel/) [OSHA PEL OSHA Permissible Exposure Limits (PEL) 1 of its parameters](https://aethair.io/resources/osha-air-quality-standards-compliance/) [SCAQMD 1180 SCAQMD Rule 1180: refinery fenceline and community air monitoring 1 of its parameters](https://aethair.io/standards/scaqmd_1180/) [USP 797 USP General Chapter <797>: pharmaceutical compounding, sterile preparations 1 of its parameters](https://aethair.io/standards/usp_797/) Built to [ISO 21501-4: light-scattering airborne particle counters](https://aethair.io/standards/iso_21501_4/) Guidance that relies on it [ANSI/ASHRAE Standard 62.1: ventilation for acceptable indoor air quality](https://aethair.io/standards/ashrae_62_1/) Solutions ## Where Particles Plus Particulate & Dust Monitors Are Used Solutions whose recommended configuration uses this instrument or whose standards it is built to, followed by solutions whose core panel it partly measures. ### [Cleanrooms, Labs & Manufacturing](https://aethair.io/solutions/cleanroom/) Particle counting and controlled environments ### [Healthcare Air Monitoring](https://aethair.io/solutions/healthcare/) Clinical air quality, pressurization, and patient safety ### [Indoor Air Quality](https://aethair.io/solutions/iaq-monitoring/) Offices, schools, homes, and public buildings ### [School Air Monitoring](https://aethair.io/solutions/education/) Classroom CO₂, particulates, and campus IAQ ### [HVAC & Building Management](https://aethair.io/solutions/hvac-building/) Monitor ventilation and filtration, with data for your BMS ### [Oil & Gas / Petrochemical](https://aethair.io/solutions/oil-gas/) Fence-line VOC, H₂S, and methane leak detection On the platform ## What Particles Plus Particulate & Dust Monitors Get From Aethair Connected through Thiamis, its readings arrive in the same Environet account as Aethair's own monitors. ### [Live data and alerts](https://aethair.io/platform/environet/) [Environet](https://aethair.io/platform/environet/) shows the instrument live and alerts the people you choose by email, SMS, and webhook, at the thresholds you set. [Noesis](https://aethair.io/platform/noesis/) sets up a dashboard, a report, or an alert from a plain-text request. ### [Compliance reports](https://aethair.io/platform/reports/) [Aethair Reports](https://aethair.io/platform/reports/) produces scheduled or on-demand reports from the instrument's readings, as a PDF or secure link. Templates cover Aethair Blue, WELL v2, cabin air (ISO 23875), and the CMS-2567 healthcare codebook (ASHRAE 170), or you can report against custom limits such as OSHA PELs, NAAQS, EPA guidance, or your own program limits. ### [Dashboards and the app](https://aethair.io/platform/dashboards/) Environet dashboards and the [Aethair App](https://aethair.io/platform/app/) show the instrument's readings just like any Aethair device. The occupant-facing [Aethair Dashboards](https://aethair.io/platform/dashboards/) status display is built around Aethair IAQ and Aethair PRO. Similar ## Other Particulate & Dust Monitors ### [Met One](https://aethair.io/sensors/met-one-particulate-dust-monitors/) [Particulate & Dust Monitors](https://aethair.io/sensors/met-one-particulate-dust-monitors/) [Met One (Acoem) real-time particulate monitors. The E-BAM is a portable beta-attenuation mass…](https://aethair.io/sensors/met-one-particulate-dust-monitors/) ### [Thermo Scientific](https://aethair.io/sensors/thermo-scientific-particulate-dust-monitors/) [Particulate & Dust Monitors](https://aethair.io/sensors/thermo-scientific-particulate-dust-monitors/) [This integration covers Thermo Scientific particulate monitors, led by the Partisol iSeries…](https://aethair.io/sensors/thermo-scientific-particulate-dust-monitors/) ### [Trolex](https://aethair.io/sensors/trolex-particulate-dust-monitors/) [Particulate & Dust Monitors](https://aethair.io/sensors/trolex-particulate-dust-monitors/) [Trolex real-time dust and silica monitors for harsh mining and industrial environments: the Air XD…](https://aethair.io/sensors/trolex-particulate-dust-monitors/) ### [TSI](https://aethair.io/sensors/tsi-particulate-dust-monitors/) [Particulate & Dust Monitors](https://aethair.io/sensors/tsi-particulate-dust-monitors/) [TSI DustTrak real-time light-scattering laser photometers for aerosol/dust mass-concentration…](https://aethair.io/sensors/tsi-particulate-dust-monitors/) Questions ## Particles Plus Particulate & Dust Monitors FAQ What do the AQM1 and AQM2 suffixes mean? The base model (e.g. 5301 or 7301) is a particle counter with optional temperature and humidity only. -AQM1 adds a CO2 sensor (0-5000 ppm); -AQM2 adds both CO2 and a photoionization (PID) TVOC sensor (5 ppb-50 ppm). All three tiers share the same 0.3-25 µm optical particle counter. How is the µg/m³ mass concentration produced? The instrument approximates PM mass concentration in µg/m³ from the optical particle counts using density and refractive-index corrections. It is derived from the same laser counter rather than a separate gravimetric or nephelometric PM sensor, so Aethair records it as the µg/m³ unit of the particle-count parameter instead of a distinct PM2.5/PM10 channel. What are the six size channels? The counters are factory-calibrated at 0.3, 0.5, 1.0, 2.5, 5.0, and 10.0 µm (six selectable channels) and size particles up to 25 µm. Both cumulative (at or above a size) and differential (per-bin) counts are reported, in particles, particles/ft³, or particles/m³, to ISO 21501-4 / JIS B9921. Where does the barometric pressure reading come from? From the counter's internal pressure sensor, which the instrument uses for volumetric-flow and mass-concentration compensation. The integration reads it over Modbus and reports it in hPa, even though it is not a headline air-quality parameter. How does the counter connect to the platform, and what model number does it report? Over Modbus RS-485. The driver reads the instrument's own model and serial number, auto-discovers the configured size channels, then polls real-time counts and the environmental/gas readings each interval. The instrument reports a bare four-digit model number on the bus (e.g. 5301); the -AQM1/-AQM2 tier is a build option, not part of that reported number. Sources: [particlesplus.com](https://particlesplus.com/5301-remote-particle-counter/) · [particlesplus.com](https://particlesplus.com/5301-iaq-remote-particle-counter/) · [particlesplus.com](https://particlesplus.com/7301-iaq-remote-particle-counter/)