--- title: "Met One E-BAM & ES-642 Particulate & Dust Monitors | Aethair" description: "Met One E-BAM & ES-642: 3 models in the Aethair sensor catalog, connected through Thiamis. Met One (Acoem) real-time particulate monitors. The E-BAM is a…" url: https://aethair.io/sensors/met-one-particulate-dust-monitors/ --- Sensors · Particulate & Dust Monitors # Met One E-BAM & ES-642 Particulate & Dust Monitors Met One (Acoem) real-time particulate monitors. The E-BAM is a portable beta-attenuation mass monitor for near-reference (US-EPA Class III comparable) PM2.5 or PM10 by beta attenuation: one inlet-selectable fraction at 16.7 L/min, a 1-hour measurement with 8–60-minute real-time averages, and a 597A temperature/RH sensor. The ES-642 remote dust monitor is a forward-scatter laser nephelometer (0–100 mg/m³ at 0.001 mg/m³, TSP inlet with optional PM10/PM2.5/PM1 cyclones, heated intake, and hourly auto-zero). [Schedule a call](https://calendly.com/d/ctdd-mkr-v9v/aethair-demo-website) [Build a Configuration](https://aethair.io/build/?params=pm2_5,pm10,temperature,humidity,wind_speed,wind_direction,pm_total) At a glance **7** parameters **3** models [**Connects via Thiamis** RS-232 · ASCII](https://aethair.io/products/thiamis/) 4 standards limit what it measures - [EU 2024/2881 EU Ambient Air Quality Directive (EU) 2024/2881](https://aethair.io/standards/eu_aaqd_2024/) - [LEED v5 LEED v5: Indoor Air Quality Performance (Operations and Maintenance)](https://aethair.io/standards/leed_v5/) - [SCAQMD 1180 SCAQMD Rule 1180: refinery fenceline and community air monitoring](https://aethair.io/standards/scaqmd_1180/) - [EPA NAAQS US EPA National Ambient Air Quality Standards (NAAQS)](https://aethair.io/standards/epa_naaqs/) Measures ## What the Met One E-BAM & ES-642 Measure 7 parameters, each linked to its page: the sensors, units, and standards behind it. [PM2.5 mg/m³](https://aethair.io/parameters/pm2_5/) [PM10 mg/m³](https://aethair.io/parameters/pm10/) [Air Temperature °C](https://aethair.io/parameters/temperature/) [Relative Humidity %](https://aethair.io/parameters/humidity/) [Wind Speed m/s](https://aethair.io/parameters/wind_speed/) [Wind Direction °](https://aethair.io/parameters/wind_direction/) [Total PM / Mass Conc. mg/m³](https://aethair.io/parameters/pm_total/) [Connects via **Thiamis**](https://aethair.io/products/thiamis/) Wired interface [RS-232 ASCII](https://aethair.io/products/thiamis/#port-rs232) Models ## Met One E-BAM & ES-642 Models 3 models, each with what it measures and the ranges its datasheet gives. | Model | Description | Measures & specs | | - | - | - | | **E-BAM** | Portable beta-attenuation mass monitor; real-time PM2.5 or PM10 (mg/m³, inlet-selectable one fraction at a time) at 16.7 L/min true volumetric flow, with a Model 597A ambient temperature/RH sensor, filter-flow and battery telemetry, and an optional wind-speed/direction sensor. Reports a real-time and an hourly concentration each minute over RS-232/RS-485; AC or DC (battery/solar) powered. | [PM2.5](https://aethair.io/parameters/pm2_5/) [PM10](https://aethair.io/parameters/pm10/) [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) [Wind Speed](https://aethair.io/parameters/wind_speed/) [Wind Direction](https://aethair.io/parameters/wind_direction/) | | **E-BAM Plus** | Upgraded, EPA-designated variant (U.S.-EPA Federal Equivalent Method EQPM-1215-226 for PM10) on the same 16.7 L/min beta-attenuation engine and Model 597A ambient temperature/RH/pressure sensor. Ships with an EPA PM10 inlet (optional PM2.5 sharp-cut cyclone or TSP inlet) plus filter temperature/RH/pressure sensors and an optional wind sensor; −15 to 10,000 µg/m³ at 1 µg/m³ resolution, hourly measurement, external AC vacuum pump, RS-232/RS-485/USB, mains-powered. Integration not yet verified against the Thiamis driver. | [PM2.5](https://aethair.io/parameters/pm2_5/) [PM10](https://aethair.io/parameters/pm10/) [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) [Wind Speed](https://aethair.io/parameters/wind_speed/) [Wind Direction](https://aethair.io/parameters/wind_direction/) | | **ES-642** | Forward-scatter laser nephelometer reporting a single real-time mass concentration, 0–100 mg/m³ at 0.001 mg/m³ resolution and 2.0 L/min. TSP inlet standard; an optional PM10, PM2.5, or PM1 sharp-cut cyclone sets the size fraction. Humidity-controlled intake heater and hourly auto-zero; RS-232/RS-485 (basic ASCII and Modbus RTU) with 4–20 mA and 0–10 V analog outputs. | [Total PM / Mass Conc.](https://aethair.io/parameters/pm_total/) | Standards ## Standards for What It Measures Standards that set limits on the parameters it reports, plus any method standard the instrument is built to. [EU 2024/2881 EU Ambient Air Quality Directive (EU) 2024/2881 2 of its parameters](https://aethair.io/standards/eu_aaqd_2024/) [LEED v5 LEED v5: Indoor Air Quality Performance (Operations and Maintenance) 2 of its parameters](https://aethair.io/standards/leed_v5/) [SCAQMD 1180 SCAQMD Rule 1180: refinery fenceline and community air monitoring 2 of its parameters](https://aethair.io/standards/scaqmd_1180/) [EPA NAAQS US EPA National Ambient Air Quality Standards (NAAQS) 2 of its parameters](https://aethair.io/standards/epa_naaqs/) [WELL v2 WELL Building Standard v2: Air 2 of its parameters](https://aethair.io/resources/well-building-standard-air-quality/) [WHO 2021 WHO Global Air Quality Guidelines 2021 2 of its parameters](https://aethair.io/standards/who_aqg_2021/) [Cal/OSHA 5141.1 Cal/OSHA Protection from Wildfire Smoke (8 CCR §5141.1) 1 of its parameters](https://aethair.io/standards/cal_osha_5141_1/) [NYSDEC DER-10 NYSDEC DER-10 Community Air Monitoring Plan (CAMP) 1 of its parameters](https://aethair.io/standards/nysdec_der10/) [RESET Air RESET Air: commercial interiors performance targets 1 of its parameters](https://aethair.io/standards/reset_air/) [SCAQMD 1466 SCAQMD Rule 1466: particulate emissions from soils with toxic air contaminants 1 of its parameters](https://aethair.io/standards/scaqmd_1466/) [EPA AQI US EPA Air Quality Index (AQI): PM2.5 breakpoints (2024) 1 of its parameters](https://aethair.io/standards/epa_aqi/) Built to [US EPA Federal Reference / Equivalent Method (FRM/FEM)](https://aethair.io/standards/epa_frm_fem/) Solutions ## Where the Met One E-BAM & ES-642 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. ### [Outdoor Monitoring](https://aethair.io/solutions/outdoor-monitoring/) Continuous outdoor air quality networks that sit alongside reference monitors ### [Weather Stations & Meteorology](https://aethair.io/solutions/weather/) Professional multi-parameter weather monitoring ### [Perimeter Monitoring](https://aethair.io/solutions/perimeter-monitoring/) Site boundary dust, silica, and noise compliance ### [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 ### [Wildfire Air Monitoring](https://aethair.io/solutions/wildfires/) Smoke plumes, black carbon, and community exposure ### [Cabin Air Quality](https://aethair.io/solutions/cabin-air/) Respirable dust, gases, and blast monitoring On the platform ## What the Met One E-BAM & ES-642 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 ### [Particles Plus](https://aethair.io/sensors/particles-plus-particulate-dust-monitors/) [Particulate & Dust Monitors](https://aethair.io/sensors/particles-plus-particulate-dust-monitors/) [Particles Plus 5000-series remote (fixed-install) and 7000-series benchtop instruments are laser…](https://aethair.io/sensors/particles-plus-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/) Article Library ## Reading on What These Instruments Measure ### [Ambient Air Quality Monitoring: What Nonattainment Changes](https://aethair.io/resources/ambient-air-quality-monitoring/) Ambient air quality monitoring explained: how PM2.5 attainment is measured, what a nonattainment designation triggers, and what site-level monitoring adds. ### [Fenceline Air Quality Monitoring: Equipment and Approaches](https://aethair.io/resources/fenceline-air-quality-monitoring/) Compare fenceline air quality monitoring approaches: standalone stations, pelican-case kits, and connected 4G sensor networks. ### [PM2.5 Exposure Limits & Monitoring: OSHA and NAAQS Standards](https://aethair.io/resources/pm25-monitoring-health-regulatory-guide/) What are the OSHA and NAAQS exposure limits for PM2.5? Fine particulate thresholds explained, plus how continuous monitoring keeps workplaces compliant. [All articles](https://aethair.io/resources/) Questions ## Met One E-BAM & ES-642 FAQ Does the E-BAM measure PM2.5 and PM10 at the same time? No. The E-BAM is a single beta-attenuation gauge that measures one size fraction at a time, set by the installed inlet. Each AutoMet data record carries a Type flag for the fitted inlet, and the Thiamis integration routes the concentration to the PM2.5 channel or the PM10 channel accordingly. Change the inlet cyclone to switch fraction. TSP and PM1 inlets are also offered, but the integration reports them on the PM2.5/PM10 channels. What is the difference between the real-time and hourly readings? Each minute the E-BAM reports two concentrations for the active size fraction: a real-time value (ConcRT) from the selectable 8–60-minute moving average, and the standard 1-hour value (ConcHr). Both are in mg/m³ and both are ingested by the platform. Which meteorological parameters does the E-BAM report? Ambient air temperature and relative humidity come standard from the Model 597A ambient sensor and keep the 16.7 L/min sample at true volumetric flow. Wind speed and wind direction are reported only when the optional wind sensor is fitted; without it the platform suppresses the placeholder values. The 597A also senses barometric pressure for internal flow correction, but pressure is not transmitted in the serial data record. How does beta attenuation compare with an optical dust monitor? The E-BAM draws a measured 16.7 L/min sample onto a glass-fiber filter tape and determines the collected mass from the attenuation of carbon-14 beta particles, a direct gravimetric-equivalent method with accuracy and precision consistent with US EPA Class III PM2.5/PM10 criteria. Unlike a nephelometer such as the ES-642 it needs no site-specific scattering correction and, sampling under true ambient conditions, captures semi-volatile nitrates and organics. What is the difference between the E-BAM and the E-BAM Plus? Both are portable 16.7 L/min beta-attenuation monitors that share the Model 597A ambient sensor and true-volumetric-flow design. The classic E-BAM is a Class III near-reference instrument that runs on AC or DC (battery/solar) and is inlet-selectable for PM2.5 or PM10. The E-BAM Plus is the upgraded, mains-powered version with an external AC pump, added filter temperature/RH/pressure sensors, and a lower detection limit, and carries a U.S.-EPA Federal Equivalent Method designation for PM10 (EQPM-1215-226); it ships with a PM10 inlet and takes an optional PM2.5 cyclone or TSP inlet. Support for the E-BAM Plus in the platform integration is not yet verified. Which particle-size fractions can the ES-642 measure? The ES-642 reports a single mass-concentration channel; the fitted inlet sets the size fraction. It ships with a TSP inlet and accepts optional PM10, PM2.5, or PM1 sharp-cut cyclones. Because the nephelometer outputs one mass value regardless of the cyclone, the platform records it as total mass concentration and the installed cyclone defines which fraction that represents. What does the Thiamis integration read from the ES-642? Only the real-time mass concentration (the instrument's ME reading) plus its status and error flags, polled once a minute; the model, serial number, and firmware version are read once at start-up. The onboard ambient-temperature, barometric-pressure, and sample-RH sensors drive the instrument's own flow control, intake heater, and auto-zero but are not transmitted to the platform. How does the ES-642 differ from a beta-attenuation monitor like the E-BAM? The ES-642 is an optical nephelometer: it infers mass from forward light scatter, calibrated to a traceable 0.6-micron PSL standard, which makes it fast, low-maintenance, and sensitive from 0.1 to 100 microns (optimal 0.5–10). It is an indicative monitor rather than a reference method; regulatory-grade mass measurement uses a gravimetric or beta instrument such as the E-BAM, and the ES-642 is often site-calibrated against one. How does the ES-642 stay accurate in humid conditions? A built-in 10-watt intake heater is regulated to hold the sample below a relative-humidity set point, drying the aerosol before it reaches the optics so condensation and hygroscopic growth do not inflate the reading. An automatic zero-calibration routine runs every hour (programmable from 1 to 999 minutes) to correct optical drift. Sources: [metone.com](https://metone.com/products/e-bam/) · [metone.com](https://metone.com/products/es-642/)