Public Lab Research note

Bayou Sauvage Draeger tubes after 24 hours

by Shannon | August 05, 2012 16:05 05 Aug 16:05 | #3139 | #3139

Images above are of the closest weather station to this site from 8/3/12.

This is a follow-up to the research note that details tubes after 8 hours:

Again, after 24 hours (8/3/12 at 9am), no changes to the tubes. Matthew from Rhus made a comment in an email thread that we should follow-up with: "I just did a small field test of Draeger tubes as well, with similar results.. i.e. no reaction on the tube. I'm wondering now if the PPM in the marsh is going to be high enough to measure on the tubes. How smelly is the marsh you are looking at? ( I have found a spot that is rather rank...) Do we have reason to think that a salt marsh will have a PPM above the 1.3ppm minimum that the tubes register? You can use the equations in the instructions to calculate a PPM over a longer time interval, but I'm not sure that they tubes are meant to be accurate beyond 8 hours. "

Pole 3 Pole3 after 24 hours IMG_0331

Pole3 24 hours IMG_0312

Pole 4 Pole4 after 24 hours IMG_0323

Pole4 24 hours IMG_0315

Pole 5 Pole5 after 24 hours IMG_0321

Pole 6 Pole6 after 24 hours IMG_0318


One of the things about the draeger tubes I've used, you have to force air through them to get them to work. These pictures all show one end sealed. They do not work in this condition. Both ends must be open. You must also be able to measure the flow rate through the tube. The tube is used incorrectly in this application.

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Maybe these are different, but every draeger I've used(many hundreds)has always required breaking the top for airflow through the tube.

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