B08_ATCH_1_SALIENTS_S23090.pdf

Salient Characteristics Special Order S23090

WEATHER STATION SYSTEM AND ACCESSORIES

SALIENT CHARACTERISTICS:

3 ea. Weather Station:

1. Shall consist of a multi-parameter, stand-alone, wireless, all-in-one weather station.

2. Shall include sensors for measuring, at a minimum, air temperature, barometric pressure, humidity, wind speed and direction.

3. Shall measure temperature over a range of at least -40 to 70o C, with a resolution of 0.1o C, and an accuracy of +/-0.3%, or better.

4. Shall measure barometric pressure over a range of at least 300 to 1,100 hpa, with a resolution of 0.1 hpa and an accuracy of +/-0.5 hpa, or better.

5. Shall measure relative humidity over a range of 0 to 100% with a resolution 0.1 and an accuracy of +/-

2% (at 20o C), or better.

6. Shall measure wind speed over a range of at least 0.01 to 60 m/s, with a resolution of 0.01 m/s, and an accuracy of +/-5% or better.

7. Shall be capable of being powered from an external 12 VDC (nominal) power source.

8. Shall include an SDI-12 interface.

9. Shall have no moving parts.

10. Shall have an Ingress Protection rating of at least IP66.

11. Shall include a built-in compass.

12. Shall have a sample rate of at least 1 Hz.

13. Shall be no taller than 9-inches and weigh no more than 1.5 lbs.

14. Shall be capable of operating over a temperature range from at least -40 to 70o C.

15. Shall include a data/power communications cable that is at least 15-ft. long with one end stripped and tinned.

16. Shall include features that facilitate mounting the unit on the stand described below.

3 ea. Mounting Stand for Weather Station:

17. Shall consist of a mounting kit that is compatible with the weather station described above.

18. Shall be capable of being installed on a vertical pipe or mast, or a horizontal pipe, up to at least 2.5-inches in diameter.

19. Shall include stand and all fastener hardware (i.e. screws, nuts, washers, lock-washers, etc.).

20. Shall include screws, or other feature(s) to secure the weather station to the stand.

1 ea. Mounting Stand for Solar Sensor:

21. Shall consist of a mount with level and base for Apogee Brand solar sensors.

22. Shall include leveling and mounting features.

23. Shall include a bull’s eye level.

24. Shall be capable of being mounted on a vertical mast or horizontal pipe up to at least 2.5-inches in diameter.

25. Shall include stand and all fastener hardware (i.e. screws, nuts, etc.).

1 ea. Evaporation Gage:

26. Shall consist of an analog output evaporation gage that is capable of measuring water levels in an evaporation pan as described below.

27. Shall include a float mechanism with potentiometer/encoder or other water level sensing device that is capable of measuring water levels in the evaporation pan described below.

28. Shall have a measurement range of 0-10” of water.

29. Shall have a system measurement accuracy of +/- 0.25% over the operating range.

30. Shall be capable of operating over a temperature range from at least -40 to 60o C.

31. Shall be capable of being powered from an external, compatible VDC power source.

32. Shall include a 3-conductor, shielded, output cable that is at least 50 ft. long.

33. Shall be no larger than 8” in diameter by 28” in height.

34. Shall include a base with leveling screws and mounting holes for secure mounting.

1 ea. Evaporation Pan:

35. Shall consist of a cylindrical, Class A Type evaporation pan for the measurement of water evaporation.

36. Shall be constructed of stainless steel and be 10” deep by 47.5” in diameter and capable of holding approximately 72 gallons of water.

37. Shall include a drain plug and standard NPT female coupling fitting.

1 ea. Pipe and Fittings for Evaporation Pan:

38. Shall consist of a pipe and fittings for connecting the evaporation gage (described above) to the evaporation pan (described above).

39. Shall allow the gage to be installed outside of, but hydraulically connected to the pan.

40. Shall be constructed of 0.5” stainless steel pipe, with NPT fittings, that allow 60 inches of separation between the pan and gage.

1 ea. Automatic Refill Kit:

41. Shall be compatible with the evaporation pan and gauge described above.

42. Shall consist of an electronic device/timer/float-kit that automatically refills the evaporation pan at user defined intervals.

43. Shall be programmable.

44. Shall include a feature that stops the water flow/refill operation at approximately 8.5 to 9.5 inches of water (in the pan) and prevents over-filling the pan.

45. Shall be capable of being powered from a small off-the-shelf battery (i.e. 9-volt, etc.).

46. Shall have standard garden hose fittings.

1 ea. Soil Moisture Sensor:

47. Shall consist of a smart sensor that is capable of performing various soil moisture measurements including, at a minimum, volumetric moisture content, permittivity, electrical conductivity, and soil temperature.

48. Shall employ measurement correction techniques for effects of soil texture and electrical conductivity.

49. Shall be SDI-12 compatible and include a pre-set sensor address of 0.

50. Sensor rods shall be 30 cm in length.

51. Shall operate from an external 12 Vdc (nominal) power source.

52. Shall measure relative dielectric permittivity with a range up to at least 80, accuracy of at least ±2 for solution EC less than or equal to 2.8 dS/m.

53. Shall measure electrical conductivity with a range of solution to at least 3 dS/m, accuracy of at least 5%

+/- of reading + 0.05 dS/m.

54. Shall measure soil temperature with a range of at least -50° to +70°C, resolution of at least 0.001°C, accuracy of at least ±0.5°C (over the full range).

55. Shall measure volumetric water content with a range up to 100%, accuracy of at least ±3% where solution EC less than 10 dS/m.

56. Shall include an interface cable that is at least 50 ft long with tinned wires on one end.