Manual

Wireless Sensor Network
2.3.2 CWS220 Electrical Specifications
Power: 2 AA Batteries
Average Current Drain:
300 μA with 15 minute polling
Radio: Internal 25 mW FHSS Radio
Absolute Accuracy: ±0.2°C @ -10° to +65°C; ±0.5°C @ -40° to +70°C
Repeatability: ±0.05°C @ -10° to +65°C; ±0.1°C @ -40° to +70°C
Response Time: <1 s to changes in target temperature
Wavelength Range: 8 to 14 μm (corresponds to atmospheric window)
Field of View (FOV): 22° half angle
2.3.3 CWS220 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)
2.4 CWS655 Specifications
2.4.1 CWS655 Physical Specifications
Dimensions
Body: 14.5 cm x 6 cm x 4.5 cm (5.7” x 2.4” x 1.8”)
Rods: 12 cm (4.7”)
Weight: 216 g (7.6 oz)
2.4.2 CWS655 Electrical Specifications
Power: 2 AA Batteries
Average Current Drain:
300 μA with 15 minute polling
Radio: Internal 25 mW FHSS Radio
Soil Water Content
Accuracy: ± 2% when using Topps equation
EC Accuracy:
±(5% of reading + 0.05 dS/m)
Temperature Accuracy: ± 0.2°C
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