B08_ATCH_1_SALIENTS_S23127_7-20-23.pdf
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- Attached to
- PRECIPITATION GAGE AND ACCESSORIES IAW SALIENTS
- Solicitation number
- 140G0123Q0231
About this file
This document outlines salient characteristics for a precipitation gage and related accessories required under Solicitation Number 140G0123Q0231 issued by the Department of the Interior US Geological Survey Office of Acquisitions and Grants. The precipitation gage must be capable of recording liquid, solid, and mixed precipitation in all weather conditions with a heater ring. It must have a 400 cm2 or larger collecting area, be able to record a minimum of 750mm of precipitation, and use a weighing measurement method with lifetime factory calibration. Additional requirements include measurement ranges, thresholds, accuracy levels, digital interfaces, electrical specifications, operating temperature and humidity ranges, and IP65 housing. Compatible installation accessories that must be provided include a 4-inch diameter stainless steel installation tube allowing a 1.0-meter installation height and a shielded cable with at least 7x0.75mm2 conductors per meter for the heating unit.
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Text version
Salient Characteristics Special Order S23127
PRECIPITATION GAGE
SALIENT CHARACTERISTICS:
Precipitation Gage:
1. Shall be capable of recording liquid, solid, and mixed precipitation in all-weather with heater ring.
2. Shall have 400 cm collecting area or better.
3. Shall have recordable precipitation amount of at least 750mm.
4. Shall have weighing measurement method that has a lifetime factory calibration, drift-free measurements, and robust protective housing to eliminate field visits for instrument service.
5. Shall have sealed load cell sensor element.
6. Shall have measuring ranges of precipitation at 0 to at least 3000 mm/h.
7. Shall have cumulative precipitation threshold at 60 min collection time at 0.05 mm/h.
8. Shall have precipitation intensity threshold at least 6mm/h.
9. Shall have accuracy of -25 to +45 °C at ±0.1 mm or ±1 % of measured value amount and intensity of ±0.1 mm/min, ±6 mm/h or ±1 % of measured value or better.
10. Shall have SDI-12- and RS-485 interface resolution at 0.01 mm, 0.01 mm/min or mm/h or better.
11. Shall have impulse output resolution at 0.05/0.1/0.2 mm or better.
12. Shall have intensity output interval at least 1 minute.
13. Shall have query interval at 1 minute to at least 60 minutes.
14. Shall have real-time output delay at less than 1 minute or better.
15. Shall have non-real time at 5 minutes or better.
16. Shall have measurement output intensity RT, amount RT/NRT, amount NRT, amount total NRT, bucket content RT and NRT, and temperature load cell.
17. Shall have digital interfaces of SDI-12 V1.3, RS-485 2- or 4-wire (SDI-12 protocol and
ASCII).
18. Shall have digital outputs 2 and 5 Hz with impulse at 0.05, 0.1, and 0.2 mm that is adjustable with status at 0 to 120 impulses/min or better.
19. Shall have USB 2.0 for service mode.
20. Shall have electrical data power supply 12 to 28 VDC, typically 12 or 24 VDC. Shall have electrical current consumption at 4.4 mA or less.
21. Shall have electrical power consumption at no more than 100 Watts at 24 VDC.
22. Shall have disabled, continuously enabled, continuously enabled within a specified temperature range, US NWS standard, and enabled in case of precipitation modes of operation.
23. Shall be no larger than 450 mm diameter by 680mm high.
24. Shall weigh no more than 17 kg when empty.
25. Shall have base plate made of stainless steel and aluminum.
26. Shall have collecting bucket made of polyethylene.
27. Shall have bucket support and pipe housing of ASA and be UV-resistant.
28. Shall have operating temperatures at - 40 to at least +60 °C.
Salient Characteristics Special Order S23127
29. Shall have relative humidity from 0 to at least 100 % non-condensing.
30. Shall have IP65 rated housing.
Installation Tube:
31. Shall be compatible with Gage above.
32. Shall be a 4-inch diameter tube with base plate.
33. Shall allow for 1.0-meter installation height.
34. Shall be made of stainless steel.
Installation Cable:
35. Shall be compatible with Gage above.
36. Shall be a shielded installation power and communication cable with at least 7x0.75mm² per m – for the heating unit.
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