Carbon dioxide measurement

✍ Scribed by Brennig James

• Publisher: Elsevier Science
• Year: 1970
• Weight: 40 KB
• Volume: 7
• Category: Article
• ISSN: 0002-1571
• DOI: 10.1016/0002-1571(70)90038-5

✦ Synopsis

With reference to the article by BE~c and LAKE (1968) on carbon dioxide measurement, I would like to draw your attention to an earlier apparatus, which was exhibited at the Physical Society Exhibition in 1968. This has the merit of greater simplicity, less cost, lower lag (down to 5 sec) and greater sensitivity. The apparatus is manufactured and sold under the name of "Gasomat" by Hampden Test Equipment of Northampton, Great Britain, and between 50 and 100 versions are in use in various scientific laboratories. It is more fully described in JAMES (1969). British patent No.1,018,658 of 1966 refers.

There appears to be little merit in arranging for the flow of air and water to oppose one another since the interchange is very rapid and in the Gasomat the flow of air serves to act as a pump for the water. This saves the cost of a second pump and ensures some improvement in stability, since the flow of air and water retain some degree of proportionality. Temperature compensation can be achieved by enclosing the apparatus in some variety of thermostat. However, a simpler solution is to introduce some temperature-compensating element such as a thermistor into the conductivity measuring circuit.