Passive no-contact detector, ideal replacement for snow pillow
Überblick
Der CS725 bestimmt Schneewasser-Äquivalent (SWE) durch passive Messung der Änderung der natürlich auftretenden elektromagnetischen Energie vom Boden nachdem sie durch die Schneedecke gelangt. Der Sensor wird über der Oberfläche aufgehängt und hat keinen Kontakt mit dem Schnee. Wenn die Schneepackung zunimmt, detektiert der Sensor die Dämpfung der elektromagnetischen Energie vom Boden, und das SWE kann berechnet werden. Die Messfläche des CS725 beträgt zwischen 50 und 100 Quadratmeter (540 bis 1,075 square feet), so dass man damit gut einen Schneekissensensor oder eine Schneewaage ersetzen kann.
Typische Anwendungen für den CS725:
- Vorhersagen für Wasserkraftwerke (Lesen Sie hier über die "Northern Canada: Hydro-electric Power Forecasting" Anwendung.)
- Ablaufmanagement
- Hochwasservorhersagen und Risiskomanagement
- Bewässerungsplanung
Funktionen und Vorteile
- Non-contact measurement
- Excellent replacement for traditional snow-pillow sensors
- Does not cause the melt of light snow
- Greatly reduces the need for site visits
- No site preparation or earthworks required for set-up
- Performance not affected by rainfall or snowfall
- Effective with any type of snow or ice
- Will not cause snow drifting
- Seven-year maintenance cycle
- No antifreeze chemicals used (i.e., glycol)
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Technische Beschreibung
The CS725 uses an innovative, non-contact method of measuring snow water equivalent (SWE). It passively detects the change in naturally occurring electromagnetic energy (mainly from the decay of 40K) from the ground after it passes through snow cover.
As SWE changes, the amount of energy that penetrates the snow pack changes—regardless of the state of the water (that is, liquid or frozen). A sensor installed above the ground prior to the first snowfall will have a base-line measurement of the electromagnetic energy coming from the ground. As snow accumulates and energy is attenuated, the SWE value will increase. The CS725 has an internal processor that determines the SWE and sends this information to a datalogger or communication device via RS-232.
Spezifikationen
| Measurement Range | 600 mm maximum water equivalent |
| Accuracy |
|
| Resolution | 1 mm |
| Coverage Angle | 60° |
| Operating Temperature Range | -40° to +40°C |
| Power Requirements | 11 to 15 Vdc |
| Power Consumption | 180 mA |
| Output Options | RS-232 (1200 to 115200 bps) |
| Cable Type | Four conductor, two-twisted pair, 22 AWG, Santoprene jacket |
| Warranty | 2 years |
| Maximum Cable Length | 30 m (98.43 ft) |
| Diameter | 12.7 cm (5 in.) |
| Length | 62 cm (24.4 in.) |
| Main Body Weight | 9 kg (20 lb) |
| Collimator Weight | 25 kg (55 lb) |
| Total Weight | 34 kg (75 lb) |
Kompatibel mit
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
Additional Compatibility Information
Collimator Considerations
Other sources of electromagnetic radiation (40K) such as trees, vegetation, and buildings that are not covered by the same amount of snow as the ground can affect the readings. To filter these signals, the optional heavy steel collar (collimator assembly, pn 29390) is installed on the bottom of the CS725.
The following chart outlines when a collimator should be used:
| Site Characteristics | Maximum SWE 300 mm | Maximum SWE 300 to 400 mm | Maximum SWE > 400 mm |
|
Very open site with no proximity to trees, buildings, or tall vegetation within a 48 m (160 ft) radius |
Optional |
Optional |
Optional |
|
No trees, buildings, or tall vegetation within a 24 m (80 ft) radius |
Optional |
Optional |
Required |
|
No trees, buildings, or tall vegetation within a 12 m (40 ft) radius |
Optional |
Required |
Required |
|
Site with minimum clearance radius of 6 m (20 ft) radius |
Required |
Required |
Required |
Note: Always confirm that your sensor has the “Collimator Installed” parameter set properly. The SWE calculations are different for a sensor with and without a collimator.
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