This product is not available for new orders.
| Services Available | |
|---|---|
| Repair | No |
| Calibration | No |
| Free Support | Yes |
概览
CWS220是我们的SI-111红外温度传感器的无线版本。不需要直接接触来测量目标的表面温度。该红外温度探头含有内部的900 MHz的射频电台，将数据传送到CWB100无线基站或另一个无线传感器。CWS220内部电台的频段通常用于美国和加拿大。
优势与特点
- 提供道路表面、植物冠层表面、土壤表面、雪表面和水体表面的温度测量
- 内部跳频的射频电台提供了更长的通讯距离和更少的干扰
- 由电池供电
- 可靠的低维护性的低功耗的测量实施方案，可用在接线传感器不适用，或者不期望使用接线传感器的应用中
- 传输可路由经过多达3个别的无线传感器
- 在野外连续测量表面温度
- 适合提供空间平均
- 兼容CR800、CR850、CR1000和CR3000数据采集器
图像
技术说明
CWS220含有一个热电堆和一个热敏电阻温度探头，热电堆测量目标的表面温度，热敏电阻测量传感器自身的本体温度。两个温度探头都安置在结实的配有锗材质窗口的不锈钢腔体内。CWS220由电池供电，即可以是碱性电池组，也可以可充电电池加上太阳能板的组合。
CWS220可以路由自己的传输路径，通过最多另外三个无线传感器。数据采集连接到CWB100基站，处理和存储数据。CWS220与PC的连接及配置，是通过A205接口来实现。
通过Stefan-Boltzman方程来决定目标温度的校准系数，在校准的时候就已经存储在CWS220中。
为什么是无线？
在那些使用有线传感器会产生一些问题的站点，继续使用有线方式会有一些问题。首先，为了保护线缆，需要穿管、挖沟，既费时又费力，有些时候甚至没有可能性。当地的防火规范可能会禁止建筑内部使用某些类型的线缆。在某些应用中，测量需要通过较长距离实现，而较长的线缆可能会降低测量质量，或者成本太高。还有些时候，增加测量的数目非常重要，而数据采集器又没有留有足够的通道用于接入额外的传感器线缆。
| 请注意：内部电台的设计并不是迅速转移数据。当转移数据时，从一个无线传感器开始，通过作为转发器使用的某个传感器，到基站电台结束，每个心跳包需要花15至30秒的时间。如果这个过程中，使用了3个转发器，则需要耗时45至90秒。 |
产品规格
| 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 |
| Absolute Accuracy |
|
| Uniformity |
|
| Optics | Germanium lens |
| Repeatability |
|
| 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 |
| FHSS Channel | 50 |
| 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 |
兼容性
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
数据采集器
| Product | Compatible | Note |
|---|---|---|
| CR200X (retired) | ||
| CR206X (retired) | ||
| CR211X (retired) | ||
| CR216X (retired) | ||
| CR295X (retired) | ||
| CR3000 (retired) | ||
| CR5000 (retired) | ||
| CR6 | The CR6 datalogger must have data logger OS version 4.0 or higher. | |
| CR800 (retired) | ||
| CR850 (retired) |
Additional Compatibility Information
Mounting
The CWS220 mounts to a mast or pole via the the 26054 bracket. It is mounted at an appropriate distance from the target where it can measure an individual leaf, a canopy, or any surface of interest. Because the CWS220 is wireless, it can be mounted in many locations that would be problematic for a cabled sensor.
下载
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.
常见问题解答
CWS220: 1
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Because the devices and the radios use the same frequency bands, there will be interference. Factors affecting the amount of interference include the distances between the communications radio and the CWS radios, and the distances between the CWS base and the sensors. Also, the amount of interference is affected by whether the communications radio is set up as a master.