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The NADP Vision

The NADP Vision. Remain one of the nation’s premier research support projects Serve scientists and educators Respond to emerging issues. Efficient measurement system.  ?. Belfort B5-780. Belfort recorded ~12% less than the stick gage!. Ott Pluvio. Geonor T-200.

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The NADP Vision

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  1. The NADP Vision • Remain one of the nation’s premier research support projects • Serve scientists and educators • Respond to emerging issues • Efficient measurement system

  2.  ? Belfort B5-780

  3. Belfort recorded ~12% less than the stick gage!

  4. Ott Pluvio

  5. Geonor T-200

  6. The CRN has 9 sites co-located with NADP sites

  7. NOAH III

  8. Performance Requirements for NADP Gage Replacement

  9. Range or Capacity OTT ETI XX+Capacity: > 25 cm (9.84 inches) liquid equivalent depth (unattended) Comment : Gage capacity is lowered, when antifreeze is added to keep the bucket contents from freezing. This would lower the capacity of the Ott gage below 25 cm.

  10. Resolution or Sensitivity OTT ETI X+ X+Reporting resolution: 0.02 cm. Sensitivity to precipitation onset: 0.02 cm. Comment : Both gages can “sense” precipitation amounts as small as 0.0025 cm (0.001 in) but have been set to report 0.025 cm (0.01 in).

  11. Accuracy OTT ETI X+ XLab Accuracy: within 0.05 cm over entire range & at rates up to 2.5 cm in 5 minutes. Field Accuracy: within 5% or 0.05 cm of NWS stick gage measurements Comment : Ott gage appears to exceed requirement and ETI meets requirement in most cases. --- Additional tests are underway. ---

  12. Gage Calibration Test To meet the calibration test requirements, these differences must be less than 0.0197 in (I.e., 0.05 cm).

  13. Ott East vs West

  14. Real-time Reporting OTT ETI X- XReport precipitation amounts in “real time,” current to within 5 minutes of polling. X X- No delays due to precipitation freezing in gage orifice. Comment : Output from Ott gage is delayed due to signal processing. ETI gage utilizes the Belfort housing that has a long neck in which snow and ice can accumulate.

  15. False Reporting OTT ETI X- XNo reported amounts in the absence of precipitation. Comment : ETI gage has had no false positive signals however the optical sensor requires a bug screen when insects are out.

  16. Possible Explanation for False Positives (April 2003 – March 2004)

  17. Failure Indication OTT ETI X X-Status report to the data logger indicating condition of important gage functions Comment : Ott reports errors in sensors & case switch. ETI gage reports temperature, battery voltage, and a Reference depth.

  18. Wind and Temperature OTT ETI X- X-Temperature: accurate at - 45C to + 50C & can withstand - 50C to +55C. X- X-Wind: accurate at 15 m/s steady & 25 m/s gusts and can withstand 30 m/s steady & 60 m/s gusts. • Comment : Load cell temperature range only goes to • 30C. Neither gage is likely to go undamaged in 60 m/s • (~133 mph) gusts. Ott gage may have wind-induced false • positive signals.

  19. Reliability, Maintainability, Availability OTT ETI X XReliability: time between failures >500 days X- X-Periodic maintenance interval > 90 days ? ?Availability: mean time to repair or maintain < 30 minutes Comment : Ott has had one temperature sensor failure (new model just received returned to manufacturer). ETI has had one optical sensor get zapped by lightning. Ott battery needs to be re-charged in < 90 days in cold weather. ETI runs fine on AC but requires solar re-charge on DC.

  20. Can we repair these instruments? NOAH III Components

  21. Grounds Maintenance Power Requirements OTT ETI X X Grounds: use mower or string trimmer up to base without damage X X Power: 110VAC or 12VDC with max consumption <5 amps @12VDC Comment : Ott runs only on 12 VDC. ETI runs fine on AC but requires solar re-charge on DC.

  22. TALLY OTT ETI 5 X- 5 X- 6 X 6 X 2 X+ 2 X +

  23. Data Communications / Query Options

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