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Water Quality Monitor - Sensor Check Procedures

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Information on steps required for sensor checks.

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Water Quality Monitor - Sensor Check Procedures

  1. 1. Water Quality Monitor Sensor Check Procedures
  2. 2. ©2014 Sea-Bird Scientific Inc. Overview •Check procedures for each sensor • Pre-deployment • Post deployment • Tracking •Service intervals • Tracking can reinforce
  3. 3. ©2014 Sea-Bird Scientific Inc. WQM – Optics • ECO Flntu or Triplet • Stability tests over time shown largest change in response in first year • +/- 2% of full scale • Routine checks done pre and post deployment capture potential drift • Bio-wiper™/Triplet wiper prevents bio-fouling from forming over optics • Service is ESSENTIAL • Every 13 months of in-water use
  4. 4. ©2014 Sea-Bird Scientific Inc. WQM – Optics Pre-deployment Checks: Establishing the ECO Offsets • Procedure based on standard ECO offset/dark count FAQ • Cover LED and Detector with black electrical tape and turn system on • Be sure to smooth tape to remove bubbles • Record the output for all channels • Use minimum or average value as offset • WET Labs records 60 seconds of data at 1 Hz – reports minimum value as offset on calibration sheet • Record new values under the Troubleshooting Tab on WQM Host
  5. 5. ©2014 Sea-Bird Scientific Inc. WQM – Optics Pre-deployment Checks: Updating the ECO Offsets • WQM Host 1.51 • Under Advanced drop down menu • Setup External Data Port • Select Internal ECO • Click boxes to enter new offsets • Using terminal program • Exit to C prompt • $xit • c:> set chl.off
  6. 6. ©2014 Sea-Bird Scientific Inc. • No specialized equipment required • Saturation stick • Hand • Calibration Cap • With sensor running, start with target 6-8” away and gradually move closer to face of sensor • Counts should increase, goal is full saturation (4120 counts) • Move away to ensure counts fall back to stable in air values WQM – Optics Pre-deployment Checks: Establishing the ECO Saturates
  7. 7. ©2014 Sea-Bird Scientific Inc. •Verify functionality •Track instrument changes over time •Additional supplies: • 12 oz can Diet Coke • 500 ml bottled water/DI water • 1000 ml glass beaker • Stir stick WQM – Optics Pre-deployment Checks: Performing Mid-Point Characterization Checks
  8. 8. ©2014 Sea-Bird Scientific Inc. •NTU Test Procedure: • Point ECO into space, record counts as offset value • Cover face of the sensor with calibration cap or hand • Record raw counts – maximum and minimum • If offset, maximum or minimum change exceeds 50 counts – contact WET Labs Support WQM – Optics Pre-deployment Checks: Mid-Point Characterization Checks Cont.
  9. 9. ©2014 Sea-Bird Scientific Inc. •Chlorophyll Test Procedure: • Mix Diet Coke with bottled/DI water • Allow to degas • Point ECO into space, record counts as offset value • Immerse ECO end into test fixture to test solution • Record raw counts • If change in offset or chlorophyll raw counts exceeds 50 counts from previous test – contact WET Labs Support WQM – Optics Pre-deployment Checks: Mid-Point Characterization Checks Cont.
  10. 10. ©2014 Sea-Bird Scientific Inc. WQM – Conductivity Pre-Deployment Check •Check conductivity zero frequency against calibration sheet • Rinse cell with distilled/DI water • Dry cell should read very close to zero conductivity reading on calibration sheet • If not, cell may be dirty/damaged • Attempt cleaning with Triton X solution
  11. 11. ©2014 Sea-Bird Scientific Inc. • More difficult to check of all sensor components • Requires moving water to make accurate reading • Plug plumbing with water inside tubing – submerge in aerated or stable water • Let sit for ½ hour or few hours • Take reading • Should give near saturation value if operating properly • 98% or 101% • DO saturation level will jump when/if pump is turned on WQM – Conductivity Pre-Deployment Check
  12. 12. ©2014 Sea-Bird Scientific Inc. WQM – Temperature Pre-Deployment Check •Comparison to secondary sensor •Known temperature comparison
  13. 13. ©2014 Sea-Bird Scientific Inc. WQM – Pressure Pre-Deployment Check •Check responsiveness with finger over pressure sensor •Reset Pressure Offset from Host Program • Pre-Deployment drop down menu • Reset the WQM Pressure Offset
  14. 14. ©2014 Sea-Bird Scientific Inc. WQM – BLIS Pre-Deployment Check • Fill bleach intake port with DI water • Under Help dropdown menu choose Troubleshooting • Select BLIS • Run 100 BLIS Cycles • Run 2-3 times to fully empty
  15. 15. ©2014 Sea-Bird Scientific Inc. WQM – Sensor Validation • Validation of moored data set with CTD cast as available • Allows for corrections • Winkler comparisons for DO sensors • Field calibrations for chlorophyll • Run through pre-deployment sensor checks to verify functionality • Pre package cleaning for base line • Post package cleaning
  16. 16. Questions? Please feel free to contact our Customer Support Team at +1 541 929 5650.

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