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Ambient Air Monitoring Instruments


List of Ambient Air Monitoring Instruments
Teledyne Aethalometer Model 633

Teledyne Aethalometer Model 633

The Model 633 Aethalometer® is used to measure ambient concentrations of black carbon in air in real time. The instrument continuously collects airborne particles onto a fiber filter and actively measures the light absorbing properties of the sample in real-time.​

Manual

URG 3000N Black Carbon Sampler

URG 3000N Black Carbon Sampler

The Model 3000N sampler draws ambient air at a constant flow rate though a specially shaped inlet where particulate matter smaller than 2.5 mm in aerodynamic diameter is inertially separated from larger particles and is collected onto a filter. The PM2.5 particles are collected on quartz filters. These filters are analyzed for organic and elemental carbon using Thermal Optical Reflective (TOR) analysis method.

Manual

Thermo 48C Enhanced Trace-Level Carbon Monoxide Analyzer

Thermo 48C Enhanced Trace-Level Carbon Monoxide Analyzer

The Model 48-C measures the amount of carbon monoxide in the air in real time. CO absorbs at around 4.7 microns. CO analyzers pass an IR beam alternatively through a reference cell containing a non-absorbing gas (N2) and a sample cell containing the ambient air sample with CO. The amount of the 4.7 microns IR light absorbed corresponds to the CO concentration. The difference in the measured intensity between the sample cell and reference cell is converted to a CO concentration using the Beer-Lambert Law. The instrument uses an exact calibration curve to accurately linearize the instrument output over any range up to a concentration of 1000ppm.

Thermo 48i TLE Enhanced Trace-Level Carbon Monoxide Analyzer

Thermo 48i-TLE Enhanced Trace-Level Carbon Monoxide Analyzer

Using gas filter correlation technology, the Model 48-TLE measures the amount of carbon monoxide in the air in real time. CO absorbs at around 4.7 Um. CO analyzers pass an IR beam alternatively through a reference cell containing a non-absorbing gas (N2) and a sample cell containing the ambient air sample with CO. The amount of the 4.7 microns IR light absorbed corresponds to the CO concentration. The difference in the measured intensity between the sample cell and reference cell is converted to a CO concentration using the Beer-Lambert Law. The instrument uses an exact calibration curve to accurately linearize the instrument output over any range up to a concentration of 1000ppm.

Thermo 42i NO2/NO/NOx Analyzer

Thermo 42i NO2/NO/NOx Analyzer

The Model 42i uses chemiluminescence (energy in the form of light ) to measure oxides of nitrogen from sub parts per billion (ppb) to 100 parts per million (ppm). Ozone (O3) is added to the sample in a reaction cell. Nitric oxide (NO) and ozone (O3) react to make nitrogen dioxide (NO2) and oxygen (O2). The NO2 produced by this reaction is in an excited state, as it return to normal, light energy is emitted. Since one NO molecule makes one NO2 molecule, the intensity of the light emitted is directly proportional to the NO concentration in the sample. The chemiluminescent reaction only occurs between O3 and NO. To determine the NO2 concentration, the ambient air stream passes through a converter which reduces any NO2 present to NO before entering the reaction cell. The analyzer measures the amount of light emitted by the reaction and converts this to a NO concentration. The differences between NO concentration in the converted and unconverted gas streams gives the amount of NO2. User programmable software capabilities allow individual measurement range settings to be stored in memory for subsequent recall and NO, NO2, NOX, hourly average storage for up to one month

Thermo 49i O3 Analyzer

Thermo 49i O3 Analyzer

The Model 49i uses UV photometric technology to measure ozone from parts per billion (ppb) to 200 parts per million (ppm) in real time. Ambient air is drawn through a cell in which the absorption of UV radiation is measured at the 254-nm emission line of a mercury lamp. A second sample that has had O3 removed using a manganese dioxide (MnO2) scrubber is drawn into the absorption chamber. This sample serves as a “blank.” Since the “blank” has had all its O3 removed, the UV light intensity detected from this sample will not be reduced. The difference in the intensity of the two is used to calculate the concentration of O3 in the sample.

Met One BAM-1020 Continuous Particle Monitor

Met One BAM-1020 Continuous Particle Monitor

The BAM-1020 automatically measures and records airborne particulate concentration levels (in milligrams or micrograms per cubic meter) of PM10 in near real time using the industry-proven principle of beta ray attenuation. At the beginning of each sample hour, a small carbon-14 element emits a constant source of high-energy electrons (beta rays) through a spot of clean filter tape. These rays are detected and counted by a detector to determine a zero reading. The BAM-1020 then advances this spot of tape to the sample nozzle, where a controlled amount of outside air flows through the filter tape. At the end of the sample hour, this dust 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. This mass and the measured air volume are used to calculate the volumetric concentration of particulate matter in ambient air.

Manual

Thermo PartisolTM 2025 Manual PM2.5 Particle Monitor

Thermo Partisol 2025 Manual PM2.5 Particle Monitor

The Partisol®-Plus2025 Sampler draws a particulate-laden ambient air stream through a PM 2.5 size selective or inlet, and then through a 47mm diameter filter. Filter exchange is performed using pneumatic pressure from the sample pump. New filter cassettes from the supply magazine are pushed up to the sampling position, while the previous cassette is moved to the storage magazine. The supply and storage magazines are covered to seal off filter cassettes when not used for sampling. In the lab, the filter is weighed (after moisture equilibration) before and after use to determine the net weight (mass) gain due to collected PM10. The total volume of air sampled, corrected to EPA reference conditions (25 ºC, 101.3 kPa), is determined from the measured flow rate and the sampling time. The mass divided by the corrected volume give the PM2.5 concentration.

Thermo PartisolTM 2025i Manual PM2.5 Particle Monitor

Thermo Partisol 2025i Manual PM2.5 Particle Monitor

The Partisol®-Plus2025 Sampler draws a particulate-laden ambient air stream through a PM2.5 size selective or inlet, and then through a 47mm diameter filter. Filter exchange is performed using pneumatic pressure from the sample pump. New filter cassettes from the supply magazine are pushed up to the sampling position, while the previous cassette is moved to the storage magazine. The supply and storage magazines are covered to seal off filter cassettes when not used for sampling. In the lab, the filter is weighed (after moisture equilibration) before and after use to determine the net weight (mass) gain due to collected PM10. The total volume of air sampled, corrected to EPA reference conditions (25 ºC, 101.3 kPa), is determined from the measured flow rate and the sampling time. The mass divided by the corrected volume give the PM2.5 concentration.

MetOne SuperSASS Monitor

MetOne SuperSASS Monitor

The SuperSASS is a 8 channel multiple event sampling system used as part of the U.S. EPA’s Chemical Speciation Network (CSN) to monitor trends of the major components of small particles (PM2.5) in ambient air: ions (ammonium, sulfates, and nitrates), organic and black carbon, trace metals, and total mass. The CSN was created in 1997 in support of the new National Ambient Air Quality Standards (NAAQS) for particulate matter. The 24-hour time integrated samples are collected on a different filter media and air volume is measured in order to calculate the concentration of the pollutant in question. MetOne SASS samples are analyzed for total mass, organic and black carbon, ions (cations and anions) of concern, and trace metals.

Manual

TSI UFP3031 Ultrafine Particle Counter

TSI UFP3031 Ultrafine Particle Counter

The UFP3031 (Ultrafine Particle) Monitor operates continuously, 24-hours a day. The operational principle is based on diffusion charging of particles, followed by size segregation within a Differential Mobility Analyzer (DMA) and detection of the aerosol via a sensitive electrometer electrometer where by successively stepping the DMA voltage and measuring the current at each step with the electrometer, an on-board computer calculates and reports the number concentration for each of the six size channels.


​T200UP NO2/NO/NOx Analyzer

The T200UP provides the measurement of ambient NO2 by photometrically measuring the light intensity, at wavelengths greater than 600 nm, resulting from the chemiluminescent reaction of NO with ozone O3.  NO2 is first quantitatively reduced to NO by a UV based photolytic converter. The NO, which commonly exists in association with NO2, passes through the converter unchanged, resulting in total nitrogen oxides (NOx) concentration of NO plus NO2.  A portion of the ambient air is also reacted with O3 without having passed through the converter, and the NO concentration is measured. This value is subtracted from the NOx concentration yielding the concentration of NO2. The chemiluminescence that results from the reaction is monitored by an optically filtered high sensitivity photomultiplier. The optical filter and photomultiplier respond to light in a narrow wavelength band unique to the NO and O3 reaction. The electronic signal produced in the photomultiplier is proportional to the NO concentration.

​Met-One E-BAM Plus

The E-BAM Plus is a portable, U.S. EPA approved, real-time method for PM10 particulate measurements. It uses the principle of beta ray attenuation to automatically measure and record airborne PM10 particulate concentration levels. It provides a simple determination of concentration in units of milligrams of particulate per cubic meter of air. A small 14C (Carbon 14) element emits a constant source of high-energy electrons known as beta rays. The beta rays are detected and counted by a sensitive scintillation detector. The vacuum pump pulls a measured amount of dust-laden air through the PM10 inlet at 16.67 liters/min. This air flows through the filter tape which is positioned between the source and the detector thereby causing an attenuation of the beta ray signal. The degree of attenuation of the beta ray signal is used to determine the mass concentration of particulate matter on the filter tape and the volumetric concentration of particulate matter in ambient air.

​Teledyne API T640

The Model T640 is a real-time, continuous particulate matter (PM) mass monitor that uses scattered light spectrometry for measurement. The T640 measures 2.5 PM. It is an optical aerosol spectrometer that converts optical measurements to mass measurements with sharp accuracy by determining sampled particle size via scattered light at the single particle level according to Lorenz-Mie Theory. The sampling head draws in ambient air with different-sized particles, which are dried with the Aerosol Sample Conditioner (ASC) and moved into the optical particle sensor where scattered light intensity is measured to determine particle size diameter. The particles move separately into the T-aperture through an optically differentiated measurement volume that is homogeneously illuminated with polychromatic light. The polychromatic light source, an LED, combined with a 90° scattered light detection achieves a precise and unambiguous calibration curve in the Mie range, resulting in a large size resolution. Each particle generates a scattered light impulse that is detected at an 85° to 95° angle where amplitude and signal length are measured; the amplitude (height) of the scattered light impulse is directly related to the particle size diameter. The T-aperture and simultaneous signal length measurements eliminate border zone error, which is characterized by the partial illumination of particles at the border of the measurement range.

​Thermo 42i-Y  NO/NOy/NOdiff Analyzer

The Model 42i-y  uses chemiluminescence (energy in the form of light ) to measure the amount of nitrogen oxides in the air from sub-ppb levels up to 1000 ppb. The Model 42i-Y is a single chamber, single photomultiplier tube design that measures NOY which includes most oxides of nitrogen with the exception of NH3 and N2O. The Model 42i NOy operates on the principle that nitric oxide (NO) and ozone (O3) react to produce a characteristic luminescence with an intensity linearly proportional to the NO concentration. Infrared light emission results when electronically excited NO2 molecules decay to lower energy states. In order for this method to work,  NOy compounds (other than NO) must first be transformed into NO before they can be measured using the chemiluminescent reaction. NOy is the sum of all reactive oxides of nitrogen (NO, NO2, NO3, N2O5, HNO2, HNO3, PAN, organic nitrates and aerosol nitrates). A solenoid valve switches between air that passes through the converter and air that does not. The sample is analyzed in the reaction chamber for NO, NOy, and the difference between the two NOdiff is calculated. A detailed description of the principles of operation of this monitor can be found in the User’s Manual. This monitor is typically only required at U.S. EPA National CORE sites.  Broward County’s site is one of three in the state of Florida.

​ATEC 2200-22  Air Toxics Monitor 

This canister sampler is designed to obtain an accurate VOC sample over a 24-hour period from midnight to midnight. The Model 2200-22 uses an internal PC and a precision pressure transducer to monitor the can pressure as a function of time to ensure uniform filling. The menu driven software allows easy sampler set-up, leak check, and data and status retrieval.  Samples are collected in evacuated 6-L summa or silonite coated canisters. Samples are analyzed by gas chromatography-mass spectrometry following EPA Compendium Method TO-15 to determine concentrations of volatile organic compounds (VOCs) which are some of the compounds the U.S. EPA designates as air toxics.