Inside the Particulate Monitor – the Triboelectric Method Bengt Löfstedt AQM 2024-02-23 View Count 1119 We’ve seen in previous blog posts that particulate concentrations can be measured by filter-based techniques as well as by some different optical methods. However, it doesn’t stop there. Let’s also have a look at a principle based on the electrical charges of particles – the triboelectric method. Read More »
Inside the Particulate Monitor – Optical Methods Bengt Löfstedt AQM 2024-02-09 View Count 1410 Particulate concentrations can be measured in a variety of ways. We’ve discussed filter-based methods in a preceding article and now it’s time to have a look at optical techniques. Read More »
Inside the Particulate Monitor – Filter Samplers Bengt Löfstedt AQM 2024-01-29 View Count 1355 Particulates in ambient air is one of the major types of air pollution, causing severe health problems in many locations around the world. Legislators have therefore imposed concentration limits and require the particulates to be monitored. But how does a particulate monitor work? Read More »
Trending Emissions Monitoring Bengt Löfstedt General, AQM, CEM 2024-01-02 View Count 2077 For the past year, OPSIS has received many orders for equipment for the monitoring of the concentrations of total mercury and dioxins in emissions to air, primarily from waste-to-energy facilities. What brought this along? Read More »
Air Pollution Part 4 – Reduction Methods Bengt Löfstedt General, AQM, CEM 2023-12-07 View Count 1580 Air pollution is undesirable but there are ways to fight it. We wrap up the series of articles about air pollution by taking a look at what to do about it. Read More »
Air Pollution Part 3 – Sources of Particulates Bengt Löfstedt General, AQM, CEM 2023-11-30 View Count 1782 In this article, we take a closer look at how particulate matter is generated, with emphasis on the smallest fractions which also are the ones with the worst health effects. Read More »
Air Pollution Part 2 – Sources of Gaseous Substances Bengt Löfstedt General, AQM, CEM 2023-11-23 View Count 1801 We continue the series of articles on air pollution by taking a closer look at where gas-phase air pollution comes from. Read More »
Air Pollution Part 1 – What’s in the Air? Bengt Löfstedt General, AQM, CEM 2023-11-16 View Count 1598 What is air pollution, where does it come from, and what can we do about it? This article is a first in a short series addressing these topics. Read More »
Gas Concentration Units and Unit Conversions Bengt Löfstedt General, AQM, CEM 2023-05-11 View Count 2769 On the most fundamental level, the signal from the sensor of a gas analyser gives the number of gas molecules, usually along an optical light beam or in a certain sampling volume. However, a concentration should not be expressed in number of molecules – the number would be far too big. Instead, it is scaled to a unit of weight-per-cubic-metre or volumetric share. How is the scaling done? Read More »
Uncertainties in Measurements Bengt Löfstedt General, AQM, CEM 2023-04-20 View Count 2099 With all efforts made on precision instrumentation, quality assurance, calibrations, parallel measurements, and adjustments, the measurement results produced by a gas monitor should be spot on, right? Well, not quite… Read More »