Subsurface Automatic samplers (SAS)

The chemistry of seawater is constantly changing due physical and biological forcing. Sufficiently characterizing daily and seasonal cycles can be prohibitively expensive due to boat and field costs. The SAS reduces those costs and increases sampling capabilities by collecting water where and when it is needed.



The rapid growth of digital design and manufacturing has facilitated a movement towards the rapid prototyping and production of scientific instrumentation. The wide availability of open-source design tools, cost-effective 3D printing, and readily available microcontrollers democratize the scientific process and data collection.  Our goal is quality open-source design, and accessible instrumentation to accurately answer real-world research questions. We have started with Subsurface Automatic Samplers (SAS) which allow divers to collect water for analysis where and when it is needed.


USer friendly and remote controlled

SAS units are field programmable with an IR remote controller and easily readable on an OLED screen. Together, these features allowing researchers to respond to dynamic field environments, changing the time, date, and volume of sample collected on the fly. Power-optimized hardware lasts up to a year, meaning that moisture-sensitive electronics never need to be exposed in the marine environment. During deployment, environmental data are logged to an onboard SD card, meaning that SAS can also be used to monitor parameters such as water temperature.


Rugged and robust, Field tested design

SAS have been extensively tested in the lab and field, including at volcanic CO2 vents in the Caribbean. SAS housings are small and strong, pressure tested to nearly 200 feet. Sampling bags are lined with neoprene covers to resist abrasion and tearing in harsh field conditions. We are interested in providing prototypes to interested laboratories to further test capabilities and to expand the breadth of the science which they can accomplish.