Échantillonneur d'air Modèle BAM1020

Features

Features
- U.S. EPA Federal Equivalent Method for PM10 and PM2.5 monitoring
- Long term unattended remote operation of up to 60 days between site visits
- Very low operating costs
- Automatic hourly span checks
- Fast and easy field audits using common FRM audit tools
- Bench top or equipment rack mounting in mobile or stationary shelters
- Rugged anodized aluminum, stainless steel, and baked enamel construction
- Highly accurate, reliable, and mechanically simple flow system
- Hourly filter advances minimize effects on volatile compounds
- Advanced Smart Heater technology precisely controls sample relative humidity
- Integrated datalogger allows the connection of up to six additional meteorological sensors
- Internal memory provides up to 182 days of digital data storage
- Data retrieval through RS-232 serial ports using direct PC connections, modems, printers,
  or digital data collection systems

Designations

The Met One Instruments Model BAM-1020 has longstanding U.S. EPA designation as a Federal Equivalent Method (FEM) for continuous PM10 particulate monitoring. In addition, the BAM-1020 is the world’s first instrument to obtain U.S. EPA FEM designation for continuous PM2.5 monitoring, when configured with the specified settings and accessories. The BAM-1020 has also obtained corresponding certifications in other countries and regions.

Principle

The BAM-1020 automatically measures and records airborne particulate concentration levels (in milligrams or micrograms per cubic meter) using the industry-proven principle of beta ray attenuation.Thousands of BAM-1020 units are currently deployed worldwide, making the unit one of the most successful air monitoring platforms in the world.

Operation
Each hour, a small 14C (carbon-14) element emits a constant source of high-energy electrons (known as beta rays) through a spot of clean filter tape. These beta rays are detected and counted by a sensitive scintillation detector to determine a zero reading. The BAM-1020 automatically advances this spot of tape to the sample nozzle, where a vacuum pump then pulls a measured and controlled amount of dust-laden air through the filter tape, loading it with ambient dust. At the end of the hour this dirty spot is placed back between the beta source and the detector thereby causing an attenuation of the beta ray signal which is used to determine the mass of the particulate matter on the filter tape and the volumetric concentration of particulate matter in ambient air.

Data Collection

All data files are accessible via an industry standard two-way RS-232 serial port using common terminal programs or Met One Instruments software such as MicroMet Plus® and Comet.™ The data is available in a variety of formats including daily reports, last record, all data, and new records since last download. Configuration files, error logs, and flow statistics are also available. Digital dataloggers may obtain data from the unit using serial port commands or by recording the automatic hourly serial output.

Error Handling
The BAM-1020 performs continuous user selected evaluation of a variety of criteria for data validation including flow statistics and a comprehensive set of error codes including power failures, flow failures, hardware failures, tape errors, nozzle errors, span check errors, beta count errors, and more.

Maintenance
The BAM-1020 is designed to run continuously with only monthly or bi-monthly scheduled maintenance— a single roll of filter tape will last more than 60 days. The BAM-1020 also contains a comprehensive self-test function which allows the unit to preemptively test itself for any mechanical failures in the tape control system.

Specifications
The BAM-1020 is designed to run continuously with only monthly or bi-monthly scheduled maintenance— a single roll of filter tape will last more than 60 days. The BAM-1020 also contains a comprehensive self-test function which allows the unit to preemptively test itself for any mechanical failures in the tape control system.