Page 59: of Marine Technology Magazine (May 2020)

Turner Designs C-FLUOR for Algal Culture Growth Monitoring

Monitoring algal growth in test tubes without affecting cultures for this growth monitoring project. Turner Designs algal cultures is a challenge for researchers. Turner Designs Databank Handheld Data Logger was used to display voltage. recently demonstrated a solution to this concern using two Maximum concentrations detected ranged from 90 to 183 standard products – C-FLUOR Chlorophyll probe with its µg/L and are plotted for fve of the 12 cultures monitored.

In-Line Adaptor. Growth data can help determine ideal conditions for growth,

Multiple algal cultures were diluted to low concentrations calculate growth rates, or monitor densities for feeding experi- of chlorophyll. Cultures were evenly distributed into 25 mm ments. Other sensors from the C-FLUOR product line can diameter glass test tubes and placed in a room temp environ- also be used to monitor for pigments such as Phycocyanin or ment near a window for exposure to natural light. Growth Phycoerythrin which may indicate contamination of algal cul- was monitored using Turner Designs C-FLUOR Chlorophyll tures. C-FLUOR are sensitive, low power single wavelength

Probe with the C-FLUOR In-Line Adaptor. Daily measure- in situ fuorescence and turbidity probes available in several ments were made and test tubes were returned to their original optical confgurations. Factory-calibrated, each C-FLUOR location near the window for continued natural light exposure. ships with a calibration certifcate used to convert the analog

These measurements were repeated until each C-FLUOR or digital output signal to a specifc concentration estimate. In

Probe’s response saturated. addition to in vivo Chlorophyll, Phycocyanin, & Phycoery-

C-FLUOR Probes output a voltage response proportional to thrin, C-FLUOR probes are also available for detecting: Crude the fuorescence detected. The C-FLUOR in vivo Chlorophyll Oil, CDOM/fDOM (dissolved organic material), Fluorescein

Blue Excitation probe was used to measure the algal test tube Dye, Rhodamine Dye, Optical Brighteners, and Turbidity.

JW Fishers’ ROVs Assist from SAR to Water Intake Inspection

Since the late 1980’s, JW Fishers’ ally, the SeaOtter-2 is suited for low

Remote Operated Vehicles (ROV) have current applications including piling been tools used across the globe for inspections, lake searches, tank inspec- various missions from the routine to tions, dam inspections, and water intake the extraordinary. JWF’s SeaOtter and inspections.

SeaLion ROV Systems are often used to locate drowning victims with attached Water Intake Inspection sonar systems, to search a ship lost at One company purchased a SeaOt- sea, or to conduct inspections on sub- ter-2 in 2019 for a particular task. The merged tanks, dams, and water intake engineering technician shared that “we pipes. are using the SeaOtter-2 to perform a

The SeaLion-2 comes standard with thorough visual inspection of our lake four high performance motors, a 1,000- water intake piping at our pump station. ft. (300m) depth rated housing, front We have two 48-in. lake water intakes and rear facing camera both with pan that are approximately 975-ft. long and tilt functionality, and an On-Screen that have two cribs each. We needed an

Display (OSD) of basic time, date, ROV that was highly maneuverable, and and GPS coordinates. Illumination is the SeaLion-2 to be ftted with various the SeaOtter-2 ft that bill.” Having an provided by 4400 lumen LED bulbs options such as a SCAN650 sector scan- in-house ROV enables the organization and a 15-in. ultra-bright LCD monitor ning sonar system, a manipulator arm, to perform several inspections per year is seamlessly displayed in the system’s scientifc research equipment, or and to monitor debris, pipe condition, and splash-proof Pelican case. More thrust RMD-1 remote metal detector. more importantly, zebra mussel infesta- is available with a “power boost” feature The SeaOtter-2 comes with the same tion as we have gone away from chlo- that provides the ROV with an extra features as the SeaLion-2, but is instead rine for zebra mussel control. “Contract burst of speed for a few seconds when it rated to withstand depths up to 500 ft. inspections can be quite costly, so we encounters heavier than normal cur- (150m). The “power boost” feature is acquire quite a savings from owning this rents. The additional payload allows not available for the SeaOtter-2. Ide- piece of equipment.” www.marinetechnologynews.com

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