HOBOnet Water Level Sensor Interface

Wireless Mote

Operating Temperature Range

-25° to 60°C (-13° to 140°F) with rechargeable batteries; -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 Frequencies

RXW-WL-900: 904–924 MHz; 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 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

4 (Water Level, Differential Pressure, Water Temperature, Barometric Pressure)

Battery Type/ Power Source

Two AA 1.2V rechargeable NiMH batteries, powered by built-in solar 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

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 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-SS-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 (0.1 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-SS-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-SS-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 (0.063 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 (RXW-WL-xxx)

Operation Range

66 to 107 kPa (9.57 to 15.52 psia)

Temperature Calibrated Range

-20 to 50°C (-4 to 122°F)

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 stable temperature

Stability (Drift)

<0.01 kPa (0.0015 psi) per year

Temperature Measurements (All Sensor End Models MX2001-0x-SS-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