• at the start of each cruise, the ac-9 windows are cleaned, the instrument is calibrated (using DI water), and the battery pack is recharged.  The calibration temperature is recorded.
• casts are made at Station ALOHA which covers a 6 nautical mile radius centered at (22°45.0' N, 158°00.0' W).
• the ac-9 and CTD are attached to a cage (with a WET Labs WetStar fluorometer and a Chelsea FRRF) and lowered over the side of the ship.
• the ac-9 is oriented horizontally in the cage.
• the cage is first deployed to 10 m and left to sit for approximately 5 minutes to flush out the pumps, then brought back up to just below the surface.
• a cast to 200-300 m is then made at a speed of 10 m/min in both directions (up and down).
• after each cast the cage and sensors are rinsed.
• one night cast is made per cruise at approximately 03:00 HST
• day casts are made near 13:00 HST
• at the first day on station, one day cast is usually made to test the equipment.
• that night, one night cast is made (for the accompanying FRRF)
• the battery pack is then recharged again.
• the second day on station, two back-to-back day casts are made (one without filters and one with 0.2 m cartridge filters covering the ac-9 inlets).

Webpage by Jasmine S. Nahorniak, Oregon State University.