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.

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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/m³0.3 µm, 0.5 µm, 1.0 µm, 2.5 µm, 5.0 µm, 10.0 µm Air Temperature°C / °F Relative Humidity%Barometric PressurehPa Carbon Dioxide (CO₂)ppm VOC (Total)ppm

Connects via Thiamis

Wired interfacesRS-232Modbus RTU RS-485Modbus RTUmulti-drop

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)Air Temperature Relative Humidity Barometric 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)Air Temperature Relative Humidity Barometric Pressure Carbon Dioxide (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)Air Temperature Relative Humidity Barometric Pressure Carbon Dioxide (CO₂)VOC (Total)
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)Air Temperature Relative Humidity Barometric 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)Air Temperature Relative Humidity Barometric Pressure Carbon Dioxide (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)Air Temperature Relative Humidity Barometric Pressure Carbon Dioxide (CO₂)VOC (Total)
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)Air Temperature Relative 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.

Built toISO 21501-4: light-scattering airborne particle counters

Guidance that relies on itANSI/ASHRAE Standard 62.1: ventilation for acceptable indoor air quality

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

Particle counting and controlled environments

Healthcare Air Monitoring

Clinical air quality, pressurization, and patient safety

Indoor Air Quality

Offices, schools, homes, and public buildings

School Air Monitoring

Classroom CO₂, particulates, and campus IAQ

HVAC & Building Management

Monitor ventilation and filtration, with data for your BMS

Oil & Gas / Petrochemical

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

Environet shows the instrument live and alerts the people you choose by email, SMS, and webhook, at the thresholds you set. Noesis sets up a dashboard, a report, or an alert from a plain-text request.

Compliance reports

Aethair 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

Environet dashboards and the Aethair App show the instrument's readings just like any Aethair device. The occupant-facing Aethair Dashboards status display is built around Aethair IAQ and Aethair PRO.

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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 · particlesplus.com · particlesplus.com

Bring the Particles Plus Particulate & Dust Monitors Into Environet

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