Michael/5of9
- Jan 25, 2017
- 13
- Joined
- Jan 25, 2017
- Messages
- 13
A good day to you at Electronics Point; this is out of the ordinary, I have an electronic flue gas analyser, made by Colwick Instruments Ltd (they are no longer around), it’s called Anagas. The sensor fitted detects CO carbon monoxide only, yet the manufacturer successfully managed to achieve detecting CO² carbon dioxide; I am guessing this was achieved by fitting the BD131 S M (a STMicroelectronics BD131/BD132 NPN+PNP Bipolar Transistor, 3 A, 45 V, 3-Pin) and other components.
This was built over twenty years ago; so the technology and components back then wouldn’t be as available as of now.
I have read that a metal oxide semiconductor can contribute to detecting CO² in the form of a transistor and have uploaded a PDF called Metal Oxide Semi-Conductor Gas Sensors, which confirms this and a link to a video called How MOSFETs and Field-Effect Transistors Work! which explains more on this subject.
It would be good to have this clarified and to know more about how this was achieved, detecting CO², from the components fitted on the two PC boards fitted inside the analyser.
You can see what it’s all about on my Microsoft OneDrive.
I am in the process of fitting a new battery pack and a new CO sensor to this analyser before it goes for re-calibration.
Kind regards Michael
Heating & electrical Engineer
This was built over twenty years ago; so the technology and components back then wouldn’t be as available as of now.
I have read that a metal oxide semiconductor can contribute to detecting CO² in the form of a transistor and have uploaded a PDF called Metal Oxide Semi-Conductor Gas Sensors, which confirms this and a link to a video called How MOSFETs and Field-Effect Transistors Work! which explains more on this subject.
It would be good to have this clarified and to know more about how this was achieved, detecting CO², from the components fitted on the two PC boards fitted inside the analyser.
You can see what it’s all about on my Microsoft OneDrive.
I am in the process of fitting a new battery pack and a new CO sensor to this analyser before it goes for re-calibration.
Kind regards Michael
Heating & electrical Engineer