YSI Extending your Water Quality Deployment Times with EXO Sondes
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Transcript of YSI Extending your Water Quality Deployment Times with EXO Sondes
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Making The Switch To EXO
Mike Lizotte
How to extend your deployment times
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YSI Sonde History
• In 1994 YSI introduced its first multiparameter sonde the Model 6000, this platform introduced the first flow independent, and patented, DO sensor to the multi-parameter sonde market place
• In 1998 YSI we upgraded this platform and introduced the Model 6600 multi-parameter sonde
• Other products followed including the 6600 EDS which used a patented brush anti-fouling system, and the last addition in the 6600V2-4 which gave our customers maximum application and deployment flexibility
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Sonde History cont.
• Over the years in all these platforms we gathered data from our customers and their applications and learned what they liked and what they wanted improved
• In 2012 it was time to show our customers that we had listened and we introduced the EXO sonde line to the market place.
• This product line which was 3 years in the making completely redefined what a multi-parameter sonde should be and how it should work
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EXO: What did we change?
• The short answer is EVERYTHING – The 6-Series product line was a workhorse and over the years we made many changes, options, and improvements to these platforms. However, at some point there comes a time when advances in electronics, technology and the lessons learned make it necessary to start over and build a new product that will serve our customers for many years to come
• EXO is the culmination of 18 years worth of our sonde building experience combined with the latest advances in materials and electronics technology
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EXO Design Goals
• Reduce calibration costs, labor and materials
• Reduce servicing requirements
• Extend deployments for long term monitoring and DCP (data collection platform) studies
• More accurate sensors for higher data quality
• Smart QC with automatic calibration and meta data generation
• Improve Anti-Fouling capabilities for all sensors
• Data must be compatible with legacy 6-Series data
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Fouling “The Enemy”
• In most deployments biofouling of the sensors is the reason water quality instruments cannot be deployed indefinitely
• Advances in technology, improved durability and the drift free nature of sensors like optical DO have now made long term deployments possible if the sensors can be kept clean
• Fouling has many forms, whether fresh water or marine, most locations have some form of fouling that must be kept at bay if we are to have high quality data
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Example 1: 6600 in a 30 day study
• Biofouling on wiper shafts, edges of sensors pH probe, and CT sensor
• At first glance because the optics are clear you would think that this data would be good
• What fouling looks like in water vs. out can be quite different
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Example 2: 6600 later in season, 50 day study
• Picture shows much cleaner sensors, some growth attached to the wiper shafts
• This again looks like minimal fouling and not a threat to the optical data
• But placing the sonde back in water shows a very different situation…
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Wiper Shaft: Fouling in Water
• The small growth on the end of the wiper shafts fans out when in water
• Currents and flow will make this growth move back and fourth in front of the optics
• The result is offsets, spikes, and interference in the measurements
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Biofouling caused
effects on sensors
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EXO 2 Sonde at Example 1 Site
• Sensors perfectly clean even after 30 days insitu
• Throughout the EXO development program the central wiper with its garage and copper alloy wiper arm demonstrated superior cleaning capabilities in all tested environments
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Summary
• The EXO2 with its central wiper and YSI recommended AF-components is the most fouling resistant sonde you can deploy
• These benefits translates into longer deployment times, less trips to the field for servicing, and higher data quality all of which contribute to lower operating costs
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Basic Materials
Getting Started
• Duck Brand or Scotch 2 inch wide clear packing tape
• High visibility Duck Tape • # 11 Xacto knife and blades • Sharp scissors • YSI 2 inch wide copper tape
(p/n 616189) • Black indelible ink Sharpie • C-Spray YSI (p/n 616290) • CT anti-fouling screen (not
shown) (p/n 599867)
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Materials: What do they do?
• The clear packing tape is installed so that removal of the copper tape (when expired) is much easier, this can be substituted by the YSI shrink wrap sleeves
• Copper Tape provides the fouling protection
• Duck brand duct tape has demonstrated an ability to reduce fouling in marine environments. If it should foul it can be removed from the sonde with minimal effort
• C-Spray is used to make removal of fouling easier from parts of the sonde that are can’t be taped
• AF-Screen provides protection to the conductivity cells
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How long does the copper last?
• The full treatment as shown will last 2 to 3 months before replacement is needed in warm marine waters, longer in less saline conditions
• The CT anti-fouling screen will need cleaning more frequently
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Sensor Removal and Cleaning
• Clean sensors of any fouling and dry
• Ensure that the inside of the conductivity cells are also clean
• Wash with dishwashing soap and warm water
• Soak in white vinegar for more aggressive cleaning
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Example 1 – CT Probe
• Remove one of the anti-fouling screens from the package and position so that the seam is not over either of the two side vents
• Do not allow top edge of screen to protrude above the temperature probe ledge
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Clear Tape Application
• Tear off a length of clear packing tape so that the main body of the probe up to the screen is covered
• Square up the tape by eye so that when it is rolled in place it is smooth and not crinkled
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Copper Tape Application
• Measure out and cut a long piece of copper tape
• Square this edge up to the base of the sensor
• The length should go up and over the CT screen to hold it in place
• Carefully roll the probe to apply copper and using the Sharpie press out any wrinkles
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Finished CT Sensor
• Note: position of seam, away from vent
• Note: top edge of screen does not protrude above flat temperature probe shelf
• If needed apply additional copper tape to close any gaps or spaces
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Example 2 – pH Sensor
• pH, DO, and the optical sensors are all protected the same way
• Cut a 4.6 inch length of the clear 2” wide packing tape and square it up to ~1/16 of an inch below the end at the bulb
• Wrap the tape around the probe, keeping wrinkles to a minimum
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EXO Sensor Wraps
• The YSI sensor shrink wrap is another option for under the copper tape
• Use extreme care when shrinking the wrap, do not use a flame or heat gun with high output
• Align at top, cut excess away at locking nut end
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Removing Excess with a Knife
Always use caution when handling a Xacto blade.
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Starting the Wrap
• Square up a 4/.6 inch long piece of copper tape to within 1/16 of an inch from bulb end
• Press firmly and begin wrapping the sensor
• Using the Sharpie roll out all wrinkles and make smooth
• If a gap exists patch it
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Example 3 – Wiper Housing
• Do not remove the Parking Garage!
• Cut three 3.5” lengths of clear packing tape
• Starting below the garage wrap the tape neatly around the body.
• Overwrap the second piece
• Wrap above garage and trim to fit with knife
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Applying the Copper
• Cut three 3.5” lengths of copper tape
• Start below the garage with the first strip
• Overlap so that second piece is square to the bottom of the housing
• Roll out all wrinkles with the Sharpie and close any gaps
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Finishing the Copper
• Fit last piece of copper
• Cut to complete wrap around • Roll out all wrinkles with the
Sharpie and close any gaps
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Setscrew
• Grease the setscrew quarterly
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Bulkhead
• Clean endcap as needed, use scouring pad or mildly abrasive sponge
• Dry excess moisture from threads and face
• Spray with C-Spray to aid in future cleanup
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Grease M&F pins
also
Installing the Wiper and Sensor
• Apply a dap of Krytox grease onto the threads of each probe and the wiper
• Also lightly grease the male, female pins, and base, unlike 6-Series wet pluggable connectors want to be lubricated
• Do this 4 times a year
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Finished Sensor Installation
• Date is written on sensors • Apply a second coat of C-Spray
onto the sensor bulkhead and probe retaining nuts, let air dry if possible
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Why protect the sonde body?
• Two sondes deployed for 4 weeks in Tampa bay
• Top sonde did not have Duck Tape protective covering, but bottom sonde does
• Upper sonde had 1 inch thick barnacle growth around entire diameter
• Taped sonde, minimal growth much easier to clean
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How to protect sonde body?
• Arrow points to 2 layers of clear Duck clear tape which has been applied over the sondes label
• This allows user to see magnet location and LED’s to confirm Bluetooth status
• No protection (tape) will eventually result in a damaged and illegible label
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Protection cont.
• Instead of the clear tape you can also use the EXO2 sonde sleeve
• High visibility green Duck tape also
provides abrasion and AF protection
• This tape is available in other
colors including camouflage
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Why you need an Antifouling Guard
• This is the interior of the stock plastic guard after 2 weeks in a productive marine site
• This growth like the growth on the 6-Series wiper shafts will affect optical sensor data and must be prevented
• The AF Guard does this!
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Greasing Wet Mateable Connectors
• Shown is a “Vented Level” EXO2 sonde connector
• Krytox grease has been applied to the rubber around the male pins including the vented center pin
• Do not allow grease to seal the open vented pin!
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Last Step
• The vented cable has been plugged in and the locking sleeve hand tightened to secure
• Same procedure for non-vented cables and dummy plugs
• Spray connector, dummy plugs, battery and compartment cover with C-Spray to aid in cleaning
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Final Thoughts
• These steps are key to long term deployments and quality data • With protected sensors, AF guard, sonde body and the EXO2’s
superior Central Wiper system the EXO2 is capable of very long deployments which translate into lower data and program costs.
• We hope that you have found this information useful and that it aids your program
• See our Installations and Mounting presentation for additional useful tips and applications information