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CWS655E 868 MHz Wireless Soil-Water Probe
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Überblick

Der CWS655E ist eine kabellose Variante unseres CS655 Bodenfeuchtesensors. Er bestimmt volumetrischen Wassergehalt, elektrische Leitfähigkeit des Bodens und Bodentemperatur. der Sensor hat ein internes 868 MHz Funkmodem, dass die Daten an eine CWB100-Basis oder einen anderen kabellosen Sensor überträgt. Die 868 MHz-Frequenz wird in Europa vielfach verwendet.

The CWS655 is an soil-water-content reflectometer with a 900-MHz radio built in. The sensor has probes that are inserted into the soil and the sensor derives the water content of the soil. It is battery-powered and contains a spread-spectrum radio transceiver, so it has no cables to limit its placement. As part of a Campbell Scientific wireless network, it sends data to a CWB100 Wireless Base Station, which then can forward the data to a computer. The 900-MHz frequency is used in the USA and Canada.
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Funktionen und Vorteile

  • Vielseitiger Sensor, misst elektrische Leitfähigkeit, volumetrischen Wassergehalt, Dielektrizitätskonstante und Temperatur
  • Messwerte werden korrigiert zur Vermeidung von Effekten durch verschiedene Bodenarten und elektrische Leitfähigkeiten
  • Breitbandfunkmodem mit internen Frequenzsprüngen ermöglicht Übertragung über größere Strecken und mit weniger Inteferenzen
  • Eine zuverlässige, wartungsarme und stromsparende Methode zum Messen wo Sensorkabel unpraktisch sind oder aus anderem Grund unerwünscht
  • Übertagungen können von bis zu 3 anderen kabellosen Sensoren weitergegeben werden
  • Battery powered
  • Kompatibel mit CR300, CR800, CR850, CR1000, CR6 und CR3000 Datenlogger

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Technische Beschreibung

The CWS655E has 12-cm rods that insert into the soil. It measures propagation time, signal attenuation, and temperature. Dielectric permittivity, volumetric water content, and bulk electrical conductivity are then derived from these raw values.

Measured signal attenuation is used to correct for the loss effect on reflection detection and thus propagation time measurement. This allows accurate water content measurements in soils with bulk ≤3.7 dS m-1 without performing a soil-specific calibration.

Soil bulk electrical conductivity is also derived from the attenuation measurement. A thermistor in thermal contact with a probe rod near the epoxy surface measures temperature. Horizontal installation of the sensor provides accurate soil temperature measurement at the same depth as the water content measurement. For other orientations, the temperature measurement will be that of the region near the rod entrance into the epoxy body.

Why Wireless?

There are situations when it is desirable to make measurements in locations where the use of cabled sensors is problematic. Protecting cables by running them through conduit or burying them in trenches is time consuming, labor intensive, and sometimes not possible. Local fire codes may preclude the use of certain types of sensor cabling inside of buildings. In some applications measurements need to be made at distances where long cables decrease the quality of the measurement or are too expensive. There are also times when it is important to increase the number of measurements being made but the datalogger does not have enough available channels left for attaching additional sensor cables.

Kompatibel mit

Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.

Datenlogger

Product Compatible Note
CR1000 (retired)
CR200X (retired)
CR216X (retired)
CR3000
CR5000 (retired)
CR6 The CR6 datalogger must have data logger OS version 4.0 or higher.
CR800 (retired)
CR850 (retired)
CR9000X (retired)

Spezifikationen

Weather Resistance IP67 rating for sensor and battery pack (Battery pack must be properly installed. Each sensor is leak tested.)
Operating Temperature Range -25° to +50°C
Operating Relative Humidity 0 to 100%
Power Source 2 AA batteries with a battery life of 1 year assuming sensor samples taken every 10 minutes. (Optional solar charging available.)
Average Current Drain 300 μA (with 15-minute polling)
Rod Length 12 cm (4.7 in.)
Body Dimensions 14.5 x 6 x 4.5 cm (5.7 x 2.4 x 1.77 in.)
Weight 216 g (7.6 oz)

Measurement Accuracies
Volumetric Water Content ±3% VWC typical in mineral soils that have solution electrical conductivity ≤10 dS/m. Uses Topps Equation (m3/m3).
Relative Dielectric Permittivity
  • ±(3% of reading + 0.8) for solution EC ≤ 8 dS/m (1 to 40 dielectric permittivity range)
  • ±2 for solution EC ≤ 2.8 dS/m (40 to 81 dielectric permittivity range)
Bulk Electrical Conductivity ±(5% of reading + 0.05 dS/m)
Soil Temperature ±0.5°C (for probe body buried in soil)

Internal 25 mW FHSS Radio
Frequency 868 MHz
Where Used Europe
FHSS Channel 16
Transmitter Power Output 25 mW (+14 dBm)
Receiver Sensitivity -110 dBm (0.1% frame error rate)
Standby Typical Current Drain 3 μA
Receive Typical Current Drain 18 mA (full run)
Transmit Typical Current Drain 45 mA
Average Operating Current 15 μA (with 1-second access time)
Quality of Service Management RSSI
Additional Features GFSK modulation, data interleaving, forward error correction, BCH (31,21), data scrambling

Downloads

Wireless Sensor Planner v.1.7 (30.5 MB) 08-08-2013

The Wireless Sensor Planner is a tool for use with Campbell Scientific wireless sensors.  It assists in designing and configuring wireless sensor networks.

FAQs für

Number of FAQs related to CWS655E: 4

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  1. Does the use of a CWS900-series interface require direct line-of-sight?

    Yes. For more information, refer to the Wireless Sensor Network Instruction Manual. 

  2. How many CWS900-series interfaces can be put inside an enclosure, such as the ENC10/12, without causing interference issues?

    CWS900-series interfaces are not designed for use inside enclosures.

  3. Can a CWS900-series interface make thermocouple measurements?

    No. 

  4. What is needed to connect a sensor that is compatible with wireless sensor interfaces to a CR800, CR1000, or CR3000 in a wireless network?

    To incorporate a sensor that is compatible with wireless sensor interfaces into a wireless network, a CWS900-series wireless sensor interface is needed, as well as an A205 CWS-to-PC interface to configure it. 

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