Dissolved oxygen and temperature

The amount of oxygen dissolved in water is dependant on temperature, salinity, and pressur eof the water. Sensorex has a good table of these values.

Motor assembly test

Motor assembly test
Originally uploaded by whirlymark

Test of magneto-coupling of motor with paddle inside the chamber was a success. We can mix the inside of the chamber.

Complete paddle assembly

Complete paddle assembly
Originally uploaded by whirlymark

Paddle assembly completed, now needs to be put inside the chamber.... This picture has notes on flickr

Stirring a benthic flux chamber

To keep the water moving in our fux chamber we need a paddle to move the water at a known rate. So a paddle was designed that will be turned by a magnet which turns outside the chamber - a magneto-coupled stirrer!

Benthic flux chamber

O-ring grooves made, and bottom chamfered. Difficult to work with such large PVC pipe, but after lots of jigs, all worked.

O-ring in place

Benthic flux chamber

Started construction of the benthic flux chambers that we will use to measure material coming out of the sediments in and around coral reefs.
Basic chamber is made of 12" PVC coupling with a nice grey top to eliminate light. Next make some O-ring grooves to seal it well and then chamfer the bottom so we can hammer it into the sediment.