The OWI-650 LP-WIVIS has been designed from the ground up for quick deployment anywhere.  The LP- WIVIS is the first present weather and visibility sensor designed for battery powered or solar powered applications.

The LP-WIVIS is more than just a sensor.  It is a system.  Other sensors including wind, temperature, relative humidity, and barometric pressure may be easily added.  The LP-WIVIS serves as both sensor and data acquisition system.  No separate data acquisition system is required.

The fully automated instrument provides accurate visibility, present weather and precipitation measurement in a single sensor.  This next generation intelligent sensor uses all digital signal processing (DSP) for no-drift high-accuracy results.  OSi’s patented environmentally adaptive algorithms use artificial-intelligence technology derived from over 25 years experience and over 200 million field hours of real-world data from our sensors installed around the world.  The result is the most advanced / easily deployable weather sensor in the world.

The LP-WIVIS is already a low power present weather and visibility sensor but to further reduce the power requirements the LP-WIVIS may be operated in intermittent mode.  In intermittent mode, the sensor is automatically powered up for one minute, reports present weather and visibility measurements and then is powered down.  The heaters are independently controlled.  In many environments the heaters are never powered on.  Advanced detection algorithms report dew or frost on lens and control heater function.

The LP-WIVISmeasures visibility and detects and quantifies rain, snow, drizzle, freezing and mixed precipitation conditions.    The  sensor is  designed  for year-round continuous operation in all climates from Antarctica to tropical rain forests. 

Thanks to the advanced DSP electronics, the typical need for field calibration is completely eliminated.  OSi Sensors are widely used by airports and regional DOT's across the US & throughout the world.  No other present weather and visibility sensor can provide this powerful combination of high performance, low power, quick deployability and proven reliability!  No other company can provide the proven level of support and customer satisfaction that OSi does!

Rechargeable batteries, solar power kits, spread spectrum radios, and additional sensors are all available options. 

Performance Specification

Measurement Technique

N/A Scintillation with optical forward scatter and optional acoustic*

Data Reporting Update Rate

N/A 1 minute

Present Weather Codes Reported

N/A More than 50 NWS and WMO codes

Present Weather Type Identification

N/A Rain, freezing rain, snow, freezing drizzle, mist, mixed, fog, haze, clear, hail and ice pellets*

Snow / Rain Accumulation

N/A .001 to 999 mm

Snow / Rain Measurement Resolution

N/A 0.001 mm

Rain Dynamic Range

N/A 0.1 to 3000 mm/hr

Rain Measurement Accuracy

N/A 5% accumulation

Snow Dynamic Range

N/A 0.01 to 300 mm/hr

Snow Measurement Accuracy

N/A 10% accumulation

Hail / Ice Pellet Reporting Accuracy

N/A Correct ID better than 90% of time*

Visibility/RVR Dynamic Range (metric and ANSI units available)

N/A 0.001 to 10+ km / 0.001 to 7.1 miles

Visibility/RVR Time Constant

N/A 3 minute harmonic

Visibility/RVR Contrast Threshold

N/A 5%

Ambient Light Dynamic Measurement Range

N/A 0 to 9,990 candles / m²

Physical Specification

Cable Length

N/A 12 ft. (3.7 meter)

DSP-WIVIS Sensor Size

N/A 21 x 8 x 4 inches (53 x 20 x 10 cm)

DSP-WIVIS Sensor Weight

N/A 4.25 lbs. (1.9 kg)

Electronic Specification

Power Requirements

N/A 10-18 VDC


N/A 3.6 vdc @ 375 mA


N/A 12 vdc @ 600 mA

Transient Protection

N/A All power & signal lines fully protected

Signal Output

N/A RS-232 ASCII, simple polled protocol

Environmental Specification


N/A -40° to 140° F (-40° to 60° C)


N/A 0 to 100%

Precipitation / Dust

N/A NEMA 4 type protection

Optional Sensors

Optional Sensors


Wind Sensor 2100-130

The 2100-130 is designed to operate within a temperature range of -30° to +70° C and with wind speeds up to 167 mph (75 m/s). Wind speed is measured using a sealed reed switch which provides a series of pulses at a rate proportional to wind speed. Aluminum cups are used for durability and strength.

Temperature/RH Probe 2100-110

The Model 2100-110 temperature humidity probe offers high accuracy and is designed for meteorological applications. The probe has separate 0 - 1 VDC linear outputs for temperature and humidity.

Best Value Pressure Sensor 2100-101-1

Low cost, accurate and stable barometric pressure sensor. The glass fused ceramic capacitive sensing capsule features inherent thermal stability, and low hysteresis.

High Accuracy Pressure Sensor 2100-101-2

The Model 2100-101-2 barometric pressure sensor is designed for use in environmental applications that require excellent accuracy, fast dynamic response, and long-term stability and reliability.