APPLICATION NOTE NO. 66

Routine Maintenance for the SBE 32 Carousel Water Sampler
June 2006

Application note in pdf format

This Application Note reviews corrosion precautions and routine maintenance for the SBE 32 Carousel Water Sampler. The reliability of the Carousel is sustained by establishing proper handling practices.

Rinse the entire Carousel with fresh water after each cast.

The Carousel’s trigger mechanism is made of titanium. The titanium is coated with Tiodizing; this product is similar to anodizing aluminum. The Tiodized surface is water lubricating and should never be oiled with petroleum or silicon-based products. Rinse the trigger mechanism with fresh water after each cast and clean it periodically with warm, soapy water. If the trigger mechanism sticks after this cleaning, remove the latch assembly and immerse the whole assembly in warm, soapy water. See Removing / Replacing Latch Assembly below.

Large zinc anodes provide corrosion protection:

• SBE 32C and 32SC - two each in lower adapter plate, lower guard ring, upper adapter plate, upper guard ring; one on pylon/hub assembly
• SBE 32 (standard)
  12-bottle size - three each on lower guard ring and upper guard ring; two on lower adapter plate; one on pylon/hub assembly
  24-bottle size - three each in lower adapter plate, lower guard ring, upper adapter plate, upper guard ring; one on pylon/hub assembly
• CTD extension stand (if used) - two

Check the anodes occasionally to verify that they are securely fastened and have not eroded.

All screws that are exposed to seawater have been generously lubricated with an anti-seize compound, Never-Seez Blue Moly, manufactured by Bostik (available through marine hardware stores). When disassembling/reassembling the Carousel, re-lubricate these screws with Blue Moly or equivalent. This compound is electrically conductive, so be careful not to get it on circuit boards.

Note: Blue Moly is molybdenum disulfide and pure nickel flake in pressure-resistant premium
grade grease, formulated without graphite, lead, or copper. See Bostik’s website (http://www.bostik-us.com/TDS/TDSFiles/NSBlueMoly.pdf) for the specifications.

1. Remove the three socket hex head screws, lock washers, and flat washers from the top of the latch assembly.

2. (For Carousels built in 2006 and later) Insert a jackscrew (jackscrew kit is provided with the Carousel) in the center hole. As you turn the jackscrew, the latch assembly will push away from the pylon.

3. Lift the latch assembly off the pylon.
4. Remove individual triggers if desired:

1. Mark the location of trigger 1 (from the retainer disk) on the trigger mount disk to aid in reassembly.
2. Remove the Phillips-head screws (eight for 32C and 32SC, six for full-size 32). Lift the retainer disk from the top of the latch assembly.
3. Pull the desired trigger(s) horizontally from the trigger mount disk. Mark the trigger(s) to aid in reassembly.

 

Replacing Latch Assembly

1. Replace the triggers on the trigger mount disk.
2. Place the retainer disk on the triggers, aligning the mark you made for trigger 1 on the trigger mount disk with trigger 1 on the retainer disk. Verify that the triggers are properly seated in the grooves and that the disk is flat. Reinstall the Phillips-head screws loosely. Tighten the screws, working in a diagonal pattern to ensure the disk remains properly seated.
3. Line up the latch assembly alignment hole with the pylon alignment pin. Seat the latch assembly on the pylon. Reinstall the three socket hex head screws, lock washers, and flat washers.

1. Remove the lifting bail.

1. Remove the hardware from underneath the lower guard ring.
2. Begin to pull the lifting bail up, until it is above the lower guard ring/adapter plate/hub assembly connection.
3. Remove the hardware from the legs of the lifting bail.
4. Pull the lifting bail out of the upper guard ring.

NOTE:

There are plastic insulators on the underside of the following connections:

• Lower guard ring/adapter plate/hub assembly - for lifting bail
• Upper adapter plate - for pylon

Verify that the insulators have not fallen out before reinstalling the pylon and lifting bail.

2. Remove the 6 socket hex head cap screws and washers from the underside of the upper adapter plate. Pull the trigger assembly with the pylon up and out of the Carousel frame.

Last modified: 06 Apr 2007

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