Hobo RXW-SMC-900 Manual

HOBOnet® Wireless Sensor Network
RXW EC-5 or 10H Soil Moisture Sensor (RXW-SMx-xxx) Manual
RXW 10HS model shown
RXW EC-5 or 10H Soil
Moisture Sensor
Models:
• RXW-SMC-900 and
RXW-SMD-900 (US)
• RXW-SMC-868 and
RXW-SMD-868 (Europe)
• RXW-SMC-921 and
RXW-SMD-921 (Taiwan)
• RXW-SMC-922 and
RXW-SMD-922
(Australia/NZ)
Included Items:
• Protective cap
• Cable ties
• Screws
22241-D
This sensor measures soil moisture and is designed to work with the HOBOnet (HOBO® RX)
Wireless Sensor Network in which data is transmitted wirelessly from the sensor mote across
the network to the station and then uploaded to HOBOlink® web-based software. With
HOBOlink, you can monitor sensor readings, view graphs, set up alarms, download data, and
more.

Specifications

RXW-SMC-xxx
Measurement Range In soil: 0 to 0.550 m³/m³ (volumetric
water content)
Extended Range -0.401 to 2.574 m³/m³; see Note 1
Accuracy ±0.031 m³/m³ (±3.1%) typical 0 to
50°C (32° to 122°F) for mineral
soils up to 8 dS/m and ±0.020
m³/m³ (±2%) with soil specific
Calibration; see Notes 2 and 3
Resolution 0.0007 m³/m³ (0.07%)
Volume of Influence 0.3 liters (10.14 oz)
Sensor Frequency 70 MHz
METER ECH O Probe Part EC-5
2
No.
Sensor Operating 0° to 50°C (32° to 122°F). Although
Temperature Range the sensor probe and cable can
safely operate at below-freezing
temperatures (to -40°C/F), the soil
moisture data collected at these
extreme temperatures is outside
of the sensor's accurate
measurement range.
Wireless Mote
Operating Temperature -25° to 60°C (-13° to 140°F) with rechargeable batteries
Range -40° to 70°C (-40° to 158°F) with lithium batteries
Radio Power 12.6 mW (+11 dBm) non-adjustable
Transmission Range Reliable connection to 457.2 m (1,500 ft) line of sight at 1.8 m (6 ft) high
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 RXW-SMC-900 and RXW-SMD-900: 904–924 MHz
Frequencies RXW-SMC-868 and RXW-SMD-868: 866.5 MHz
RXW-SMC-921 and RXW-SMD-921: 921 MHz
RXW-SMC-922 and RXW-SMD-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 Up to 50 wireless sensors or 336 data channels per one HOBO RX station
Motes
Logging Rate 1 minute to 18 hours
Number of Data Channels 2
Battery Type/
Two AA 1.2V rechargeable NiMH batteries, powered by built-in solar
Power Source panel or two AA 1.5 V lithium batteries for operating conditions of -40° to
70°C (-40° to 158°F)
RXW-SMD-xxx
In soil: 0 to 0.570 m³/m³ (volumetric
water content)
-0.659 to 0.6026 m³/m³; see Note 1
±0.033 m³/m³ (±3.3%) typical 0 to
50°C (32° to 122°F) for mineral soils
up to 10 dS/m and ±0.020 m³/m³
(±2%) with soil specific calibration;
see Notes 4 and 5
0.0008 m³/m³ (0.08%)
1 liter (33.81 oz)
70 MHz
10HS
0° to 50°C (32° to 122°F). Although
the sensor probe and cable can
safely operate at below-freezing
temperatures (to -40°C/F), the soil
moisture data collected at these
extreme temperatures is outside of
the sensor's accurate
measurement range. Extended
temperatures above 50°C (122°F)
will decrease mote battery life.