CWS220
CWS220
RetiredConfigurable900 MHz Wireless Infrared Radiometer
Pricing
- Model:
- CWS220
- Item Number:
- 26173
- Warranty:
- 1 year
- Lead time:
- 14 days
Overview
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.
Key Advantages
Wireless network means flexibility, cost savings, time savings
Technical Description
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 data logger 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.
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 data logger does not have enough available channels left for attaching additional sensor cables.
Note: The internal radio is not designed to move a lot of data quickly. It takes 15 to 30 seconds per hop when moving data from a sensor, through a sensor used as a repeater, and ending up at the base radio. Going through three repeaters could take a data packet anywhere from 45 to 90 seconds to get to the base radio.
Benefits
- 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
- Battery powered
- 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
Specifications
- 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
- ±0.2°C
(-10° to +65°C)
- Absolute Accuracy
- ±0.5°C
(-40° to +70°C)
- Uniformity
- ±0.1°C
(-10° to +65°C)
- Uniformity
- ±0.3°C
(-40° to +70°C)
- Optics
- Germanium lens
- Repeatability
- ±0.05°C
(-10° to +65°C)
- Repeatability
- ±0.1°C
(-40° to +70°C)
- 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
Related Resources
Documents
- Brochure
Campbell Wireless Sensor Network
October 2016
View Document - Brochure
CWS220, CWS220A, CWS220E Wireless Infrared Radiometers
View Document - Manual
Wireless Sensor Network (CWB100, CWS220, and CWS900)
November 2017
View Document - Document
CWS-Series and CWB-Series Discontinuation Notice
February 2017
View Document - View all documents
