Campbell Scientific Wireless Sensor Network (CWB100, CWS220, and CWS900) - Manual (Page 21)

Wireless Sensor Network
2.4.3 CWS655 Environmental Specifications
Temperature Range: -25° to +50°C (-13° F to + 122°F)
Humidity Range: 0 to 100%
Weather Resistance: IP67 rating for sensor and battery pack (battery pack
must be properly installed; each sensor is leak tested)
2.5 CWS900 Specifications
2.5.1 CWS900 Physical Specifications
Dimensions: 15 cm x 6 cm x 4.5 cm (6” x 2.4” x 1.8”)
Weight: 184 g (6.5 oz)
2.5.2 CWS900 Electrical Specifications
Power: 2 AA Batteries
Average Current Drain: 300 μA with 15 minute polling (depending
on attached sensor)
Radio: Internal 25 mW FHSS Radio
Single-Ended Analog Channels: SE1, SE2, SE3
Differential Analog Channels: DF1
Analog Input Range: -1 to + 2.5 VDC
Accuracy: ±(0.02% of reading + 2 µV) @ 0° to +50°C;
±(0.05% of reading + 2 µV) @ -35° to +70°C
Resolution: 0.3 μV
Excitation Voltage: 2.5V, 3.3 V, 5.0 V
20 mA maximum
Excitation Voltage Accuracy: ±2% @ -35° to +70°C
Bridge Measurement Accuracy
(+2.5 excitation only):
±(0.03% of reading + 3 µV) @ 0° to + 50°C;
±(0.07% of reading + 3 µV) @ -35° to + 70°C
Low Level AC Input: 20 mV minimum
10 kHz maximum frequency
Switch Closure
Maximum Count Rate:
Minimum Open Time:
Minimum Closed Time:
Maximum Bounce Time:
100 Hz
5 ms
5 ms
4 ms
Temperature Accuracy: ± 0.2ºC
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