CS725 Snow Water Equivalent Sensor
Rugged, Reliable
Passive no-contact detector, ideal replacement for snow pillow
wetter wasser energie gas flux and turbulence bauwerke boden


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:

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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.


Measurement Range 600 mm maximum water equivalent
  • ±15 mm (from 0 to 300 mm)
  • ±15% (from 300 to 600 mm)
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.


Product Compatible Note
CR1000 (retired)
CR200X (retired)
CR216X (retired)
CR5000 (retired)
CR9000X (retired)

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




No trees, buildings, or tall vegetation within a 24 m (80 ft) radius




No trees, buildings, or tall vegetation within a 12 m (40 ft) radius




Site with minimum clearance radius of 6 m (20 ft) radius




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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