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HOBOnet® Wireless Sensor Network
HOBOnet Water Level Sensor Interface User Guide
RXW Water Level Sensor
Models:
• RXW-WL-900 (US)
RXW-WL-868 (Europe)
RXW-WL-921 (Taiwan)
RXW-WL-922 (Australia/NZ)
Included Items:
• Cable ties
• Screws
28084-B
This sensor interface, which is compatible with the MX2001 suite of sensors, monitors changing
water levels in a wide range of applications, including streams, lakes, wetlands, tidal areas, and
groundwater. It 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® cloud software. With HOBOlink, you can monitor sensor readings,
view graphs, set up alarms, download data, and more.
Specifications
Wireless Mote
-25° to 60°C (-13° to 140°F) with rechargeable batteries
Operating Temperature
-40° to 70°C (-40° to 158°F) with lithium batteries
Range
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-WL-900: 904–924 MHz
Frequencies
RXW-WL-868: 866.5 MHz
RXW-WL-921: 921 MHz
RXW-WL-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
4 (Water Level, Differential Pressure, Water Temperature, Barometric
Number of Data Channels
Pressure)
Battery Type/
Two AA 1.2V rechargeable NiMH batteries, powered by built-in solar
Power Source
panel or two AA 1.5V non-rechargeable lithium batteries for operating
conditions of -40 to 70°C (-40 to 158°F)
Battery Life
With NiMH batteries: Typical 3–5 years when used in the temperature
range -20° to 40°C (-4°F to 104°F) and positioned toward the sun (see
Mounting and Positioning the Mote); using the batteries outside this range
reduces the battery life.
With non-rechargeable lithium batteries: 1 year, typical use.
Memory
16 MB
Dimensions
Interface Connector Diameter: 25.4 mm (1 inch)
Cable length: 1.83 m (6 ft)
Mote: 16.2 x 8.59 x 4.14 cm (6.38 x 3.38 x 1.63 inches)
Weight
229 g (8.08 oz)
Materials
Sensor: Polycarbonate housing encasing epoxy sealed circuit board
Cable: Polyurethane
Mote: PCPBT, silicone rubber seal
Environmental Rating
Mote: IP67, NEMA 6
Compliance Marks
RXW-WL-900: See last page.
RXW-WL-868: The CE Marking identifies this product as
complying with all relevant directives in the European Union
(EU).
RXW-WL-921: See last page.
RXW-WL-922: See last page.
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Table of Contents
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Related Manuals for Hobo HOBOnet RXW-WL-900
Summary of Contents for Hobo HOBOnet RXW-WL-900
- Page 1 It 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®...
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Page 2: Water Level Sensor
HOBOnet Water Level Sensor Interface User Guide Water Level Sensor Pressure (Absolute) and Water Level Measurements MX2001-01-SS-S and MX2001-01-Ti-S Operation Range 0 to 207 kPa (0 to 30 psia); approximately 0 to 9 m (0 to 30 ft) of water depth at sea level, or 0 to 12 m (0 to 40 ft) of water at 3,000 m (10,000 ft) of altitude Factory Calibrated 69 to 207 kPa (10 to 30 psia), 0°... - Page 3 HOBOnet Water Level Sensor Interface User Guide Barometric Pressure (RXW-WL-xxx) Operation Range 66 to 107 kPa (9.57 to 15.52 psia) Temperature -20 to 50°C (-4 to 122°F) Calibrated Range Accuracy ±0.2 kPa (±0.029 psi) over full temperature range at fixed pressure; maximum error ±0.5% FS Water Level Accuracy* Typical error: ±0.075% FS, 0.3 cm (0.01 ft) water Maximum error: ±0.15% FS, 0.6 cm (0.02 ft) water...
- Page 4 HOBOnet Water Level Sensor Interface User Guide LEDs: There are two LEDs to the left of the LCD screen. The Adding the Mote to the HOBOnet Wireless Sensor green LED blinks during the process of joining a network, Network blinking quickly while the mote searches for a network and The mote must join a HOBOnet Wireless Sensor Network then slowly as the mote registers with the network.
- Page 5 HOBOnet Water Level Sensor Interface User Guide 6. Press the button on the mote for 3 seconds. The signal Mounting and Positioning the Sensor Node strength icon flashes and then cycles. • Position the sensor node towards the sun, making sure the solar panel is oriented so that it receives optimal sunlight throughout each season.
- Page 6 HOBOnet Water Level Sensor Interface User Guide Suspending the direct-read cable and water level sensor Enable Scaling for the HOBOnet water level sensor. In HOBOlink: • Option 1 (preferred): Using the long direct-read cable a. Select Devices, RX Devices, then select your station. (CABLE-DR-xxx) and a compatible well-cap b.
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Page 7: General Guidelines
HOBOnet Water Level Sensor Interface User Guide Scenario 2: Measuring Water Depth (Figure 3) Ensure the water level sensor is in the air. Make sure your RX Station is logging and connecting fast enough for you to see the current water depth readings. -
Page 8: Battery Information
HOBOnet Water Level Sensor Interface User Guide Updating Mote Firmware If a new firmware version is available for the mote, use HOBOlink to download the file to your computer. 1. In HOBOlink, go to Devices, then RX Devices, and select the name of your station. -
Page 9: Lithium Batteries
HOBOnet Water Level Sensor Interface User Guide To replace rechargeable batteries: 1. Open the mote door. 2. Remove the old batteries and install fresh ones observing polarity. 3. Make sure the solar panel cable is plugged in. Store the solar panel connector here when using lithium batteries... - Page 10 ISM radio wave radiated devices. U.S. and International Sales: 1-508-759-9500 © 2020–2023 Onset Computer Corporation. All rights reserved. Onset, HOBO, HOBOnet, and HOBOlink are registered www.onsetcomp.com/contact/support trademarks of Onset Computer Corporation. All other trademarks are the property of their respective companies.
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