ONSET HOBO RX2100-WL MicroRX Water Level Station

The HOBO MicroRX Water Level Station is a cellular, web-enabled water level monitoring solution for stormwater, floodwater, irrigation, hydrologic, and environmental applications. Pre-programmed water

  • Product Name: MicroRX Water Level Station
  • Item No.:RX2100-WL
  • Manufacturers:Onset
  • Country of Origin:USA

The HOBO MicroRX Water Level Station is a cellular, web-enabled water level monitoring solution for stormwater, floodwater, irrigation, hydrologic, and environmental applications. Pre-programmed water flow formulas for select weirs, flumes, and a stage discharge table result in an easy and intuitive configuration.

New water flow and accumulated rainfall calculations, which are performed directly on the station at time of measurement, trigger immediate notifications of critical water level conditions.

The compact and durable station, together with the non-vented water level sensor, enables harsh condition deployments and reliable monitoring. The optional integrated solar panel or battery power, with a wide range of plug-and-play smart sensors, supports flexible environmental monitoring.

Highlighted Features

l  Station-side alarms for water flow and accumulated rainfall triggered at time of measurement

l  Non-vented ceramic water level sensor with a choice of four ranges

l  Interchangeable, Kevlar-reinforced water level sensor cables

l  Integrated barometric pressure sensor

l  Compact IP66/NEMA 4X enclosure

l  Built-in LCD confirms proper setup and operation

l  Two power options:

Integrated 1.7 W solar panel with rechargeable battery pack

5 W and 15 W external solar panels can be added (RX2104 only)

User-replaceable AA lithium batteries

l  Inputs for five plug-and-play smart sensors

l  Up to 10-minute connections rates via 4G cellular data plans

l  Cloud-based monitoring and data access through HOBOlink

l  Available with stainless steel or titanium sensor ends

l  3-point NIST-traceable calibration certificate included for the water pressure sensor

In what environment does this data logger operate?

This data logger operates in an underwater environment.

What measurements does this data logger support?

The RX2100-WL data logger supports the following measurements: Absolute Pressure, Barometric Pressure, Evapotranspiration, Leaf Wetness, Light Intensity, PAR, Pulse Input, Rainfall, Relative Humidity, Soil Moisture, Temperature, Water Level and Wind


To see the full specifications for this product, please see our product manual found under the documentation tab if available

Operating Range     RX2103: -40° to 60°C (-40° to 140°F)

RX2104: -20° to 60°C (-4° to 140°F)

Smart Sensor Connectors     5

Smart Sensor Network Cable Length     100 m (328 ft) maximum

Smart Sensor Data Channels     Maximum of 15 (some smart sensors use more than one data channel; see sensor manual for details)

Logging Rate     1 minute to 18 hours

Time Accuracy     ±8 seconds per month in 0° to 40°C (32°F to 104°F) range;

±30 seconds per month in -40° to 60°C (-40° to 140°F) range

Battery Type/Power Source     RX2103: 6 AA 1.5 V lithium batteries or AC power adapter (P-AC-1)

                                                    RX2104: Integrated 1.7 watt solar panel and NiMH rechargeable battery pack; optional AC power adapter (P-AC-1) or external solar panel (SOLAR-xW) can be used in place of integrated solar panel

Battery Life

RX2103 Battery Life:    

Battery life with daily connections:     RX2103: 1 year with 2 minute logging

Battery life with hourly connections and 1 minute logging:     RX2103: 2 months

Note:      Deployments in areas with weak cellular strength could reduce battery life.

RX2104 Battery Life:

Typical 3–5 years when operated in the temperature range -20° to 40°C (-4° to 104°F); operation outside this range will reduce the battery service life.

Maximum connection rates with built-in solar panel, in full sun:

l  10 minute connections year round for latitudes less than ±40°

l  10 minute connections through three seasons in other regions, reduced to 30 minute connections in winter

Maximum connection rates with external 5W or 15W solar panels:

l  10 minute connections year round, in full sun

l  Connection rate with external solar panels may be less if deployed in partial sun

Battery life without solar recharging, with hourly connections and1 minute logging:

l  RX2104: 2 months

Memory    16 MB, 1 million measurements, continuous logging

Alarm Notification Latency     Logging interval plus 2–4 minutes, typical

Enclosure Access     Hinged door secured by two latches with eyelets for use with user-supplied padlocks

LCD     LCD is visible from 0° to 50°C (32° to 122°F); the LCD may react slowly or go blank in temperatures outside this range

Materials     Outer enclosure: Polycarbonate/PBT blend with brass inserts; Interior: Polycarbonate/PBT; Gasket: Silicone foam; Cable channel: Santoprene™ TPE; U-Bolts (not included): Steel with zinc dichromate finish

Dimensions     19.95 x 13.68 x 7.49 cm (7.85 x 5.39 x 2.95 in.)

Weight     678 g (23.9 oz)

Mounting     Optional U-bolts are compatible with masts up to 4.14 cm (1.63 in.) mast diameter; can also be mounted with zip ties or mounted to a flat surface with screws

Environmental Rating     Weatherproof enclosure, NEMA 4X and IP66 (requires proper installation of cable channel system)

Wireless Radio          GSM/GPRS/EDGE: Quad band 850/900/1800/1900 MHz

UMTS/HSPA+: Seven band 800/850/900/1800/1900/2100 MHz

LTE: Twelve Band 700/800/850/900/1800/1900/2100/2600 MHz

Antenna      4G LTE

Water Level Sensor:

Pressure (Absolute) And Water Level Measurements MX2001-01-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 Range     69 to 207 kPa (10 to 30 psia), 0° to 40°C (32° to 104°F)

Burst Pressure     310 kPa (45 psia) or 18 m (60 ft) depth

Water Level Accuracy*     Typical error: ±0.05% FS, 0.5 cm (0.015 ft) water

Maximum error: ±0.1% FS, 1.0 cm (0.03 ft) water

Raw Pressure Accuracy**     ±0.3% FS, 0.62 kPa (0.09 psi) maximum error

Resolution     <0.02 kPa (0.003 psi), 0.21 cm (0.007 ft) water

Pressure Response Time (90%)***     <1 second at a stable temperature

Pressure (Absolute) And Water Level Measurements MX2001-02-S:

Operation Range     0 to 400 kPa (0 to 58 psia); approximately 0 to 30.6 m (0 to 100 ft) of water depth at sea level, or 0 to 33.6 m (0 to 111 ft) of water at 3,000 m (10,000 ft) of altitude

Factory Calibrated Range     69 to 400 kPa (10 to 58 psia), 0° to 40°C (32° to 104°F)

Burst Pressure     500 kPa (72.5 psia) or 40.8 m (134 ft) depth

Water Level Accuracy*     Typical error: ±0.05% FS, 1.5 cm (0.05 ft) water

Maximum error: ±0.1% FS, 3.0 cm (0.01 ft) water

Raw Pressure Accuracy**     ±0.3% FS, 1.20 kPa (0.17 psi) maximum error

Resolution     <0.04 kPa (0.006 psi), 0.41 cm (0.013 ft) water

Pressure Response Time (90%)***     <1 second at a stable temperature

Pressure (Absolute) And Water Level Measurements MX2001-03-S:

Operation Range     0 to 850 kPa (0 to 123.3 psia); approximately 0 to 76.5 m (0 to 251 ft) of water depth at sea level, or 0 to 79.5 m (0 to 262 ft) of water at 3,000 m (10,000 ft) of altitude

Factory Calibrated Range     69 to 850 kPa (10 to 123.3 psia), 0° to 40°C (32° to 104°F)

Burst Pressure     1,200 kPa (174 psia) or 112 m (368 ft) depth

Water Level Accuracy*     Typical error: ±0.05% FS, 3.8 cm (0.125 ft) water

Maximum error: ±0.1% FS, 7.6 cm (0.25 ft) water

Raw Pressure Accuracy**     ±0.3% FS, 2.55 kPa (0.37 psi) maximum error

Resolution     <0.085 kPa (0.012 psi), 0.87 cm (0.028 ft) water

Pressure Response Time (90%)***     <1 second at a stable temperature

Pressure (Absolute) And Water Level Measurements MX2001-04-S and MX2001-04-Ti-S:

Operation Range     0 to 145 kPa (0 to 21 psia); approximately 0 to 4 m (0 to 13 ft) of water depth at sea level, or 0 to 7 m (0 to 23 ft) of water at 3,000 m (10,000 ft) of altitude

Factory Calibrated Range     69 to 145 kPa (10 to 21 psia), 0° to 40°C (32° to 104°F)

Burst Pressure     310 kPa (45 psia) or 18 m (60 ft) depth

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

Raw Pressure Accuracy**     ±0.3% FS, 0.43 kPa (0.63 psi) maximum error

Resolution     <0.014 kPa (0.002 psi), 0.14 cm (0.005 ft) water

Pressure Response Time (90%)***     <1 second at a stable temperature

Barometric Pressure (RX2103 and RX2104 station):

Operation Range:     66 to 107 kPa (9.57 to 15.52 psia)

Temperature Calibrated Range     -20 to 50°C (-4 to 122°C)

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

Resolution     <0.01 kPa (0.0015 psi)

Response Time     <1 second at a stable temperature

Stability (Drift)     0.1°C (0.18°F) per year

Temperature (Water Level Sensors MX2001-0x-S and MX2001-0x-Ti-S):

Operation Range     -20° to 50°C (-4° to 122°F)

Accuracy     ±0.44°C from 0° to 50°C (±0.79°F from 32° to 122°F)

Resolution     0.1°C at 25°C (0.18°F at 77°F)

Response Time (90%) :     5 minutes in water (typical)

Stability (Drift):     0.1°C (0.18°F) per year

* Water Level Accuracy: With accurate reference water level measurement, known water density, and a stable temperature environment. System Water Level Accuracy equals the sum of the Barometric Water Level Accuracy plus the selected sensor Water Level Accuracy.

** Raw Pressure Accuracy: Absolute pressure sensor accuracy includes all sensor drift, temperature, and hysteresis-induced errors.

*** Changes in Temperature: Allow 20 minutes in water to achieve full temperature compensation of the pressure sensor. There can be up to 0.5% of additional error due to rapid temperature changes.

Measurement accuracy also depends on temperature response time.