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Overview
The CWS900A allows a sensor with a special connector to be used in a wireless sensor network; the special connector is available as an option for a large variety of sensors. (See the Compatibility information on the web page.)
The CWS900A contains an internal 922 MHz spread-spectrum radio that transmits data to the CWB100A Wireless Base Station or to another wireless sensor. The frequency of the internal radio is commonly used in the Australia and New Zealand.
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Benefits and Features
- Allows a wide variety of sensors to be used in a wireless network
- 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
Images
Detailed Description
The CWS900A has a sealed connector for attaching one rain gage, wind sensor, temperature/RH probe, or another low-power sensor. It measures analog voltages, low-level ac, pulse counts, and can supply an excitation voltage for powering some sensors or making bridge measurements. The type of measurement that the sensor performs is configured using Wireless Sensor Planner, Network Planner, or DevConfig software. The CWS900A interfaces with the PC for configuration via the A205 CWS Sensor to PC Interface.
The CWS900A can route its transmissions through up to three other wireless sensors. A datalogger is connected to the CWB100A base station for processing and storing the CWS900A's data.
This interface is battery powered using either alkaline batteries or a rechargeable battery and a solar cell.
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.
| 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. |
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 | 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 and depending on attached sensor) |
| Analog Channels |
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| Analog Input Range | -1 to +2.5 Vdc |
| Resolution | 0.3 μV |
| Excitation Voltage | 2.5 V, 3.3 V, 5.0 V (20 mA maximum) |
| Excitation Voltage Accuracy | ±2% (-35° to +70°C) |
| Low-Level AC Input | 20 mV minimum (10 kHz maximum frequency) |
| Temperature Accuracy | ±0.2ºC |
| Analog Measurement Accuracy |
|
| Bridge Measurement Accuracy (+2.5 V excitation only) |
|
| Dimensions | 15 x 6 x 4.5 cm (5.9 x 2.4 x 1.77 in.) |
| Weight | 184 g (6.5 oz) |
Switch Closure |
|
| Maximum Count Rate | 100 Hz |
| Minimum Open Time | 5 ms |
| Minimum Closed Time | 5 ms |
| Maximum Bounce Time | 4 ms |
| Maximum Number of Counts | Records 1,000,000 counts before it rolls over. |
Internal 25 mW FHSS Radio |
|
| Frequency | 920 to 928 MHz |
| Where Used | Australia and New Zealand |
| 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 |
Compatibility
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
Dataloggers
| Product | Compatible | Note |
|---|---|---|
| CR1000 (retired) | ||
| CR200X (retired) | ||
| CR211X (retired) | ||
| CR216X (retired) | ||
| CR3000 (retired) | ||
| CR6 | ||
| CR800 (retired) | ||
| CR800 (retired) | ||
| CR850 (retired) | ||
| CR850 (retired) | ||
| CR9000X (retired) |
Sensors
| Product | Compatible | Note |
|---|---|---|
| 03002-L | With -CWS option | |
| 034B-L (retired) | With -CWS option | |
| 05103-L | With -CWS option | |
| 109 | With -CWS option | |
| 110PV-L (retired) | With -CWS option | |
| CMP11-L (retired) | With -CWS option | |
| CS215-L (retired) | ||
| CS300-L (retired) | With -CWS option | |
| CS700H-L | ||
| HC2S3-L (retired) | With -CWS option | |
| HFP01-L | With -CWS option | |
| TB4-L (retired) | With -CWS option | |
| TE525-L | With -CWS option |
Miscellaneous
| Product | Compatible | Note |
|---|---|---|
| 014A-L | ||
| 05103-45-L | With -CWS option | |
| 05106-L | With -CWS option | |
| 05305-L | With -CWS option | |
| 107 | ||
| 108 | ||
| 109SS-L | With -CWS option | |
| 27106T-L | ||
| 43347-L | ||
| 52202-L | ||
| CMP21-L | ||
| CMP6-L | With -CWS option | |
| CS511-L | With -CWS option | |
| CS526-L (retired) | ||
| CS547A-L | ||
| CS700-L | ||
| CSAT3 (retired) | ||
| CSIM11-L | ||
| CSIM11-ORP-L | ||
| HMP155A-L | ||
| HMP60-L | With -CWS option | |
| LI190SB-L (retired) | With -CWS option | |
| LI200S-L (retired) | With -CWS option | |
| LI200X-L (retired) | ||
| LWS | With -CWS option | |
| OBS-3+ (retired) | ||
| OBS300 (retired) | ||
| TB4MM-L (retired) | With -CWS option | |
| TE525MM-L | With -CWS option |
Additional Compatibility Information
Data Logger Considerations
Compatible Data Logger Operating Systems
- CR800-Series: CR800.Std.21 and higher
- CR1000: CR1000.Std.21 and higher
- CR3000: CR3000.Std.21 and higher
- CR6: Version 4.0 and higher
Sensors
One sensor attaches to the CWS900A. Sensors with the -CWS option will include a connector that mates with the CWS900A. Alternatively, a sensor can connect with the CWS900A via the A150 Desiccant Case.
A150 Desiccated Case
The A150 Desiccated Case has a -CWS cable termination option. It allows our CS450 and CS455 pressure transducers or other sensors that have a vented cable to be connected to the CWS900A. Sensors that measure analog voltages, frequency, and pulse can also use the A150 to connect with the CWS900A.
Documents
Brochures
Miscellaneous
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.
Frequently Asked Questions
Number of FAQs related to CWS900A: 2
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Yes. For more information, refer to the Wireless Sensor Network Instruction Manual.
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CWS900-series interfaces are not designed for use inside enclosures.
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