OPSIS Blog

TRS Monitoring in the Pulp Industry

Bengt Löfstedt
CEM
2024-03-13
View Count 1456

“The smell of money” is something you may hear close to a pulp production facility, but to be honest, the odour is not pleasant. Continue reading to learn more about the processes generating the fumes, and how to monitor them and emissions from pulp production in general!

Gas Concentration Units and Unit Conversions

Bengt Löfstedt
General, AQM, CEM
2023-05-11
View Count 2775

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?

Continuous Emissions Monitoring – What, Why, and How?

Bengt Löfstedt
CEM
2023-05-05
View Count 1978

Combustion-based heat and power production has historically been an environmental culprit. However, increased awareness and legislative requirements have improved the situation notably over the past decades. But which rules apply, which emissions-to-air limits are there, and how are the emissions determined?

Regulating Mercury Emissions

Bengt Löfstedt
CEM
2023-03-07
View Count 1480

Have you heard of new and strict regulations on mercury emissions within the European Union? If you are responsible for the operations at a waste incineration facility, you probably have. But what’s the issue with mercury, and what do the EU regulations say?

Inside the Gas Analyser – the Tuneable Diode Laser

Bengt Löfstedt
General
2021-04-08
View Count 13197

OPSIS is probably best known for its gas analyser systems based on broad-band (“white”) light from xenon lamps and spectrometers or interferometers as the core analysis devices. However, OPSIS also offers an instrument type base on a quite different optical technique – light absorption detected by utilizing a tuneable diode laser. Let’s take a closer look!

Inside the Gas Analyser – the Interferometer

Bengt Löfstedt
General
2021-03-16
View Count 4122

Some OPSIS gas analysers are based on a device called an interferometer. Like a spectrometer, it separates light into its wavelength components, but it’s done in a special and indirect way. Keep on reading to find out how!

Inside the Gas Analyser – the Spectrometer

Bengt Löfstedt
General
2021-02-23
View Count 4966

Several of OPSIS gas analyser types are based on a device called a spectrometer. It separates light into its wavelength components, allowing the analyser to detect light absorption and thereby determine gas concentrations. Let’s take a closer look at how a spectrometer works!

Long-term Sampling of Dioxins and Carbon Dioxide

Bengt Löfstedt
CEM
2021-01-29
View Count 5832

One of OPSIS newest product offers is a system for long-term sampling of dioxins, the DX100. What is it and how does it work, and above all, why is there an interest in dioxins sampling right now? And why sample CO₂? Click here to find answers to these questions!

The Positive of Negative Numbers

Bengt Löfstedt
General
2020-03-13
View Count 4264

You may have seen a gas concentration reported as less than zero, and that may have made the alarm bells go off. There can of course not be less than no molecules present in the air. But it doesn’t have to mean that the monitoring equipment is bad, it can just as well be valuable data. Let’s take a closer look on how that works!