Wet Labs WQM Hardware User's Manual
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Wet Labs WQM Hardware User's Manual

Water quality monitor
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Water Quality Monitor
This user's guide is an evolving document. If you find sections that are unclear, or missing
information, please let us know. Please check our website periodically for updates.
WET Labs, Inc.
PO Box 518
Philomath, OR 97370
541-929-5650
fax: 541-929-5277
www.wetlabs.com
WQM Hardware User's Guide (wqmhw)
(WQM)
Hardware User's Guide
Revision J
7 May 2009

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  • Page 1 This user’s guide is an evolving document. If you find sections that are unclear, or missing information, please let us know. Please check our website periodically for updates. WET Labs, Inc. PO Box 518 Philomath, OR 97370 541-929-5650 fax: 541-929-5277 www.wetlabs.com WQM Hardware User’s Guide (wqmhw) Revision J 7 May 2009...
  • Page 3 To return the instrument, contact WET Labs for a Return Merchandise Authorization (RMA) and ship in the original container. WET Labs is not responsible for damage to instruments during the return shipment to the factory. In honoring this warranty, WET Labs will supply all replacement parts and labor, and pay for return via 3 -day air shipping.

  • Page 5: Table Of Contents

    Control Electronics ......................2 Delivered Equipment ...................... 3 Specifications ........................4 Setup and Operation ..................5 Mounting WQM for Deployment ................... 5 Preparing the BLIS for Deployment ................6 WQM Maintenance and Cleaning ..............17 Cleaning Supplies and Solutions .................. 17 Cleaning Conductivity and Dissolved Oxygen Sensors ..........

  • Page 7: Instrument Description

    Conductivity, Temperature, Depth Sensor The CTD components of the WQM are the same accurate and stable thermistor, conductivity cell, and pressure sensors that are used in the SBE MicroCAT and ARGO float products. WET Labs has fortified them for long-term deployment on moorings in high biofouling regimes by incorporating multiple active and passive anti-biofouling technologies.

  • Page 8: Chlorophyll Fluorometer And Turbidity Sensor (Flntu)

    140 degrees. BLeach Injection System (BLIS) Each WQM is equipped with a bleach injection system. The system periodically injects user- determined measured amounts of a household-grade bleach solution into the plenum of the DO sensor. Field trials show that periodic bleach injection prolongs the WQM deployment by at least a month or more.

  • Page 9: Delivered Equipment

    Fluorescent stick for bench testing FLNTU MAA-220050 Scotch-Brite™ pad for cleaning copper XXX-000229 CT-DO cleaning device 50431 ® 50 ml plastic bottle, Triton X-100 50091 Ecominder anti-fouling paint kit BAA-003000 3/8-in. right-angle hose barb RXA-031630 WQM Hardware User’s Guide (wqmhw) Revision J 7 May 2009...

  • Page 10: Specifications

    Chlorophyll fluorescence is created by living organisms and is subject to taxonomical and physiological changes. Field calibration is highly recommended. See user’s guide for standard protocols. e. Depth rating is the lesser of 200 m or the pressure sensor rating. 1.7.1 Connector Pinout Summary for WQM Function Ground...

  • Page 11: Setup And Operation

    Setup and Operation The illustrations below show the main exterior features and sensor locations of the WQM, in its vertical orientation: the CTD is at the top and the fluorometer and turbidity optical sensors are at the bottom, facing down. This allows bubbles to float free of the CT- and DO-sensors’ plumbing system, and it shields the optical sensors from direct sunlight.

  • Page 12: Preparing The Blis For Deployment

    WQM. When testing the BLIS system, the WQM should always be immersed in water and the plumbing filled with water. Before a WQM is deployed, the BLIS must be filled with bleach and the BLIS pump primed. ® BLIS uses a 125 ml Playtex Premium Nurser baby bottle as a bleach reservoir.
  • Page 13 2.2.1 Check BLIS Operation 1. Remove the BLIS end cap: Use a 7/64-in. hex key to remove the two screws. 2. Twist and pull to remove the cap and expose the bleach reservoir. WQM Hardware User’s Guide (wqmhw) Revision J 7 May 2009...
  • Page 14 Slide it up and off the BLIS and CTD. 5. Use a 7/64-in. hex key to remove the two screws at the base of the outer BLIS sleeve (copper tube). WQM Hardware User’s Guide (wqmhw) Revision J 7 May 2009...
  • Page 15 7. Clean the BLIS module (black plastic housing attached to WQM) with fresh water and a rag to remove all sediment and loose material. Inspect the intake and rinse it gently with fresh water if you see debris in the intake.
  • Page 16 Check again for intake blockage. • Call WET Labs Technical Support for further instructions or to obtain an RMA for return. • 10. Reassemble the outer sleeve to the base of the BLIS. The slot in the sleeve must line up with the little tube between the BLIS and the CT-DO sensor head.
  • Page 17 Use the 5/32” hex key to snug up the screw. Do not overtighten. 13. Install the BLIS end cap: Unless you are returning the WQM to service immediately, install the BLIS end cap to keep the parts together and to keep the BLIS intake clean.
  • Page 18 (recommended) orientation. 6. If you intend to mount the WQM horizontally, or if the air in the reservoir is otherwise of concern, purge the air by pushing up on bottom of the drop-in liner with your fingers until bleach flows from the nipple.
  • Page 19 If you have any question about performing this procedure, practice while the BLIS outer sleeve is removed. Use water, not bleach when practicing. WQM Hardware User’s Guide (wqmhw) Revision J 7 May 2009...
  • Page 20 WARNING! Bleach is corrosive to many of the WQM’s outer components. Avoid spilling bleach onto the instrument. 4. Gently press down on the cap and align the threaded holes in the cap with the holes in the outer sleeve.
  • Page 21 DO NOT re-use old screws. Replacement screws are in the spare parts kit that shipped with the WQM and are available from WET Labs. 6. Draw bleach into the pump. Run the BLIS pump for 10 seconds at 2 Hz. This will draw bleach from the bottle into the BLIS plumbing, but will not pump bleach as far as the CT/DO chamber.
  • Page 22 WQM Hardware User’s Guide (wqmhw) Revision J 7 May 2009...

  • Page 23: Wqm Maintenance And Cleaning

    WQM Maintenance and Cleaning The WQM should be serviced after each deployment, but in highly productive regions, it may need more frequent servicing. In addition, WET Labs recommends you return your WQM to us annually for a thorough cleaning and servicing by our trained technicians.

  • Page 24: Cleaning Conductivity And Dissolved Oxygen Sensors

    Cleaning Conductivity and Dissolved Oxygen Sensors Follow the steps below for a routine cleaning, sufficient when the WQM has no visible deposits or marine growth post-deployment. Sensors with visible deposits and marine growths are considered severely fouled.
  • Page 25 12. Repeat steps 9 and 10 several more times. 13. Flush with DI water as you did at the beginning (Step 4) to clear all traces of bleach and detergent. WQM Hardware User’s Guide (wqmhw) Revision J 7 May 2009...
  • Page 26 3.2.1 Replacing CT-DO Intake Anti-fouling Device The WQM is equipped with two anti-fouling devices in the CT-DO flow path. One is in the intake and the other is in the exhaust. They are effective for approximately a year. WET Labs strongly recommends you return your WQM annually for service, which includes factory replacement of the anti-fouling devices.
  • Page 27 4. Lift the T-C duct top straight up and off. 5. The anti-foulant cartridge in the T-C duct base is now visible. The O-ring may pop out of its groove. Gently push it back into place if necessary. WQM Hardware User’s Guide (wqmhw) Revision J 7 May 2009...
  • Page 28 T-C duct base. 8. Place the used anti-foulant cartridge and swab into a bag for disposal. 9. Thread a new anti-foulant cartridge onto a swab and slide it into the recess. WQM Hardware User’s Guide (wqmhw) Revision J 7 May 2009...
  • Page 29 12. Align the cap as shown and slide it into place. You can see the tip of the temperature probe in the hole on the right. 13. Install the two large Phillips head screws on either side of the cap. WQM Hardware User’s Guide (wqmhw) Revision J 7 May 2009...
  • Page 30 3. Unscrew the end of the canister. 4. Replace the anti-foulant cartridge as you did on the intake. Re-assembly is the reverse of the removal. WQM Hardware User’s Guide (wqmhw) Revision J 7 May 2009...

  • Page 31: Cleaning The Flntu

    Depending on the degree of accumulated biofouling, it may also be necessary to remove the outer faceplate and the WQM guard ring for cleaning: 1. Be sure the WQM is NOT powered or connected to a power source prior to uninstalling the Bio-wiper™ and faceplate.
  • Page 32 180 degrees to cover the optics after sampling. 14. If the wiper requires adjustment, loosen the screw, make the necessary adjustments, and repeat steps 9 through 13 to ensure that the wiper is performing properly. WQM Hardware User’s Guide (wqmhw) Revision J 7 May 2009...

  • Page 33: Inspecting The Pressure Sensor

    Prior to long-term storage, the BLIS reservoir, pump, and tubing should be purged to prevent the inadvertent discharge of bleach into the WQM pump manifold and onto the DO sensor. Follow the procedures in section 2.2.1 to purge the BLIS.
  • Page 34 WQM Hardware User’s Guide (wqmhw) Revision J 7 May 2009...

  • Page 35: Calibration And Characterization

    The strain-gauge pressure sensor is capable of meeting the error specification with some allowance for aging and ambient temperature induced drift. Pressure sensors show most of their error as a linear offset from zero. The WQM host software allows you to reset the offset to adjust for changes as necessary.

  • Page 36: Fluorometer And Turbidity Sensor

    The FLNTU is configured for a chlorophyll measurement range of 0.02–50 µg/l, and the turbidity sensor’s measurement range is 0–25 NTU. Gain selection is done at WET Labs by adjusting several gain settings inside the instrument, and running a dilution series to determine the zero voltage offset and to ensure that the dynamic range covers the measurement range of interest.

  • Page 37: Appendix A: Anti-Fouling Technical Reference

    UPS, which will power the CPU long enough to save any recent data, close any open files, and store required operating parameters. If power is restored to the WQM within 1 second of power removal, the WQM will restart data collection, processing, and storage.

  • Page 38: Appendix C: Ecominder® Application

    Beyond that, if you want to paint your cage, clamps and cables…do so. No tape necessary. WQM Hardware User’s Guide (wqmhw) Revision J 7 May 2009...
  • Page 39 It will work just fine. Finished! Our test piece went in the bay looking just like this. The paint remains flexible on the open spans of tape. WQM Hardware User’s Guide (wqmhw) Revision J 7 May 2009...
  • Page 40 H. Van Zee Delete horseshoe mounting clamps from spare parts list 10/8/08 (ECN 327, DCR 625) A. Derr 5/7/09 Add hose barb to spare parts kit (DCR 668) A. Derr WQM Hardware User’s Guide (wqmhw) Revision J 7 May 2009...

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