Overview
A solar-powered wireless sensor that works with the HOBOnet system to monitor air temperature and relative humidity. HOBOnet wireless sensors communicate data directly to the HOBO RX3000 or the HOBO MicroRX station, or pass data through other wireless sensors back to the central station. They are preconfigured and ready to deploy, and data is accessed through HOBOlink, Onset's innovative cloud software platform.
Features
Sensor Features
High accuracy: ± 0.2°C (± 0.36°F) and ± 2.5% RH
Robust RH sensor withstands extended use in high-humidity environments
Wireless Features
900 MHz wireless mesh self-healing technology
450 to 600 meter (1,500 to 2,000 feet) wireless range and up to five hops
Up to 50 wireless sensors or 336 data channels per HOBO RX station
Simple button-push to join the HOBOnet wireless network
Onboard memory to ensure no data loss
Powered by rechargeable AA batteries and built-in solar panel
Specifications
Temperature Sensor
Measurement Range
-40°C to 75°C
-40°F to 167°F
Accuracy
±0.25°C from -40° to 0°C
±0.45°F from -40° to 32°F
±0.20°C from 0° to 70°C
±0.36°F from 32° to 158°F
±0.25°C from 70° to 75°C
±0.45°F from 158° to 167°F
Resolution
0.02°C
0.036°F
Drift
<0.01°C per year
0.018°F per year
Response Time (typical, to 90% of change)
With RS3-B solar radiation shield: 6 minutes, 30 seconds in air moving 1 m/sec
RH Sensor
Measurement Range
0–100% RH at -40° to 75°C (-40° to 167°F); exposure to conditions below -20°C (-4°F) or above 95% RH may temporarily increase the maximum RH sensor error by an additional 1%
Accuracy
±2.5% from 10% to 90% RH typical to a maximum of ±3.5% including hysteresis at 25°C (77°F); below 10% and above 90% ±5% typical
Resolution
0.01% RH
Drift
<1% per year typical
Response Time (typical, to 90% of change)
With RS3-B solar radiation shield: 30 seconds in air moving 1 m/sec
Wireless Mote
Operating Temperature Range
-25° to 60°C with rechargeable batteries
-13° to 140°F with rechargeable batteries
-40° to 70°C with lithium batteries
-40° to 158°F with lithium batteries
Radio Power
12.6 mW non-adjustable
+11 dBm non-adjustable
Transmission Range
Reliable connection to 609.6 m (2,000 ft) line of sight at 3 m (10 ft) high
Wireless Data Standard
IEEE 802.15.4
Radio Operating Frequencies
RXW-THC-922: 916–924 MHz
Modulation Employed
OQPSK (Offset Quadrature Phase Shift Keying)
Data Rate
Up to 250 kbps, non-adjustable
Duty Cycle
<1%
Maximum Number of Motes
Up to 50 wireless sensors or 336 data channels per one HOBO RX station
Logging Rate
1 minute to 18 hours
Number of Data Channels
3
Battery Type/Power Source
Two AA 1.2V rechargeable NiMH batteries, powered by built-in solar panel or two AA 1.5 V lithium batteries for operating conditions of -40° to 70°C (-40° to 158°F)
Battery Life
With NiMH batteries: Typical 3–5 years when operated in the temperature range -20° to 40°C
see Deployment and Mounting), operation outside this range will reduce the battery service life
Memory
16 MB
Dimensions
Cable length: 2 m (6.56 ft)
Weight
Sensor and cable: 110 g (3.88 oz);
Materials
Mote: PCPBT, silicone rubber seal
Environmental Rating
Mote: IP67, NEMA 6
