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Bức xạ kế hồng ngoại không dây 900MHz Campbell Scientific CWS220
The CWS220 is a wireless version of our SI-111 infrared radiometer. It measures the surface temperature of an object without physical contact. This radiometer has an internal 900 MHz spread-spectrum radio that transmits data to a CWB100 Wireless Base Station or to another wireless sensor. The frequency of the CWS220's internal radio is commonly used in the US and Canada.
Provides road surface, plant canopy, soil surface, snow surface, and water surface temperature measurements
Internal frequency-hopping, spread spectrum radio provides longer range and less interference
A reliable, low maintenance, low power method for making measurements in applications where cabled sensors are impractical or otherwise undesirable
Transmissions can be routed through up to three other wireless sensors
Measures surface temperature continuously in the field
Ideal for providing spatial averages
Compatible with CR800, CR850, CR1000, and CR3000 dataloggers
The CWS220 includes a thermopile, which measures surface temperature, and a thermistor, which measures sensor body temperature. The two temperature sensors are housed in a rugged body that contains a germanium window. It is battery powered using either alkaline batteries or a rechargeable battery and a solar cell.
The CWS220 can route its transmissions through up to three other wireless sensors. A datalogger is connected to the CWB100 base station for processing and storing its data. The CWS220 interfaces with a PC for configuration via the A205 CWS Sensor to PC Interface.
The calibration coefficients used for determining the target temperature by means of the Stefan-Boltzman equation are stored in the CWS220 at the time of calibration.
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.
|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 Range||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)|
|Response Time||< 1 s (to changes in target temperature)|
|Target Temperature Output Signal||60 μV per °C difference from sensor body|
|Body Temperature Output Signal||0 to 2500 mV|
|Wavelength Range||8 to 14 μm (Corresponds to atmospheric window.)|
|Field of View (FOV)||22° half angle|
|Dimensions||15 x 6 x 4.5 cm (5.9 x 2.4 x 1.77 in.)|
|Weight||270 g (9.6 oz)|
Internal 25 mW FHSS Radio
|Frequency||902 to 918 MHz|
|Where Used||US and Canada|
|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, data scrambling, RSSI reporting|