A06_Specifications.docx

Salient Characteristics Special Order S21091

WEATHER STATION SENSORS AND ACCESSORIES

SALIENT CHARACTERISTICS:

8 EA, Weather Station:

1. Shall consist of a compact weather sensor capable of measuring the following meteorological parameters: wind speed and direction, air temperature, relative humidity, and barometric pressure.

2. Shall include an integrated electronic compass.

3. Shall contain no moving parts.

4. Shall have a sampling rate of 1 Hz, or better.

5. Shall have an Ingress Protection rating of IP66 or better.

6. Shall have SDI-12 digital output communication.

7. Shall measure air temperature over a range of -40 to 70o C with an accuracy of +/-0.3o C and a resolution of 0.1o C or better.

8. Shall measure wind speed over a range of 0.01 to at least 50 m/s with a resolution of at least 0.01 m/s.

9. Shall operate from an external 12 VDC (nominal) power source.

10. Wind speed shall not be affected by temperature drops or rainfall.

11. Shall include a communication cable, at least 17 ft. long, with open tinned leads on one end.

8 EA, Mounting Stand

12. Shall consist of a mounting kit for the weather sensor described above.

13. Shall be capable of being installed on a vertical pipe or mast, or on a horizontal pipe up to 2.5 inch in diameter.

14. Shall be made of corrosion resistant materials.

15. Shall include all hardware including screws, washers, and nuts for mounting.

8 EA, Radiation Sensor

16. Shall consist of a net radiometer capable measuring the difference between incoming and outgoing short-wave and long-wave radiation from the Earth.

17. Shall operate from an external 12 VDC (nominal) power source.

18. Shall include facilities for leveling the device.

19. Shall include an internal heater to reduce formation of dew and melting of frost.

20. Shall include an integrated Resistance Temperature Detector (RTD) sensor for compensation of radiation measurements.

21. Shall have separate outputs for short-wave and long-wave radiation.

22. Shall have at least four (4) radiation shields.

23. Shall have an operating temperature range of at least -40 to 70o C.

24. Shall have an accuracy of +/-10% or better for 12-hour totals, day or night.

25. Shall be compliant with CE directives.

26. All sensors shall have individual calibration factors.

8 EA, Terminal Input Module

27. Shall be compatible with the radiation sensor described above.

28. Shall consist of a 100 Ohm 4-wire PRT bridge module to facilitate temperature measurements with radiation sensor above.

8 EA, Tripod

29. Shall consist of a general-purpose weather station tripod used for mounting the sensors and enclosure described herein.

30. Shall be collapsible to facilitate transport.

31. Shall be made of corrosion resistant materials.

32. Shall have individually adjustable legs allowing mast to be extended up to at least 10 ft.

33. Shall include, at a minimum, the tripod base, mast, mast extension, ground rod, lightning rod, and stakes for securing the base to the ground. Shall also include applicable clamps and UV-resistant wire ties.

8 EA, Guy Wire Kit

34. Shall be compatible with the tripod described above.

35. Cables shall be 15 ft in length.

36. Shall be made of corrosion resistant materials.

37. Shall consist of a kit including the guy wire cables, turnbuckles, hooks, and hardware to provide additional wind support for the tripod described above.

8 EA, Anchor Kit

38. Shall be compatible with the tripod described above.

39. Shall consist of cables, rod(s), and other components sufficient for securely anchoring the tripod in sandy, loamy soils.

40. Shall be made of corrosion resistant materials.

7 EA, Enclosure

41. Shall be a weather-resistant enclosure that is 16 inches wide x 18 inches tall.

42. Shall be constructed of reinforced fiberglass and include a gasketed hinged door.

43. Shall be white and UV-stabilized to reduce solar radiation and temperature gradients inside the enclosure.

44. Shall include a standard back-plate prepunched with ½ inch diameter on-center holes for mounting communication or measurement control devices.

45. Shall include an accessory kit which contains, as applicable, desiccant, cable ties, wire tie tabs, putty, grommets, screws, and PVC coupling.

46. Shall include no enclosure mounting features.

47. Shall include one (1) conduit for cables.

48. Shall include stainless steel lockable hasps and hinge(s).