• Measures solar radiation for evapotranspiration (ET) and Temperature/Humidity/Sun/Wind (THSW) Index.
• Diffuser element and housing are carefully designed for accurate cosine response.
• Silicon photo diode provides good match to solar spectrum.

• Watermark® soil moisture sensor uses electrical resistance to measure the moisture level of the soil. Does not require periodic maintenance during the growing season. Simply bury at the desired depth, then monitor moisture levels throughout the season.
• The Soil Moisture Sensor must be connected via a Leaf & Soil Moisture/Temperature Station (#6345) (up to four sensors), or an EnviroMonitor Node.
• Includes 15′ (4.6m) cable.

• Use to monitor the level of surface moisture on foliage, with range from 0 (completely dry) to 15 (saturated).
• The Leaf Wetness Sensor must be connected via either a Wireless Soil Moisture/Temperature Station (#6345 or 6345CS), or an EnviroMonitor Node (#6810). Includes 40′ (12 m) cable.

• Add an additional wind station to your Vantage Pro2 or Vantage Vue system with a Sensor Transmitter and WeatherLink Live.
• Includes 40’/12m cable.
• One-year manufacturer’s warranty.

• Measure temperature of air, soil, or water with this multi-purpose temperature probe.
• Use with a Leaf & Soil Moisture/Temperature Station (up to four per station), or with an EnviroMonitor Node.
• Probe has a 2-1/2″ (64 mm)-long stainless steel housing and includes 15′ (4.6 m) direct-burial cable.

• Measures the sunburning portion of the UV spectrum. Allows you to display UV index, dose rate, and daily and accumulated dose.
• Diffuser provides excellent cosine response.
• Measures global solar UV irradiance, which includes both directly transmitted and scattered UV.
• Transducer responds only to radiation in the region of interest and is stable in the presence of heat and humidity.
• Cutoff ring with a comb structure for cosine response of ± 4% FS.
• Two-piece housing minimizes radiation heating, allows convection cooling of the sensor, and prevents the trapping of water or dust.

What is a UV sensor?

A Davis Instruments UV light sensor measures the intensity of ultraviolet light in the 280-360 nanometer range, which is the wavelength most responsible for damage to human skin. Davis makes two different UV sensors. One measures UV light in the range that is of concern to human health, whereas the #6450 Davis Solar Radiation Sensor measures light in the 300 to 1,100-nanometer range. This is an excellent sensor for measuring solar irradiance for agricultural applications.

How does a UV sensor work?

The sensor collects UV light and converts it to an electrical signal. Two types of light sensors are available. One uses a photodiode and the other uses a photoresistor.

• Photodiode-type UV sensor

  A photodiode-type UV sensor measures illuminance. When light strikes the photodiode, it energizes the electrons, which causes an electric current. The electric current will be stronger in response to brighter light. The electrical current can then be measured and transformed into a digital or analog output.

• Photo-resistor UV sensor

  A photo-resistor UV sensor works by measuring a change in resistance that is caused by the light available. These types of sensors are less accurate than those that use a photodiode and are usually limited to applications where the only information needed is whether the light is on or off. They can also be used to compare relative light levels in a space.

Davis instruments UV light sensor uses photodiode technology that allows a more accurate picture of the UV light present. Photodiode technology is similar to that used in solar panels. It is also the most useful for scientific use where accuracy and sensitivity are important.

What is a UV sensor made of?

The UV index sensor uses a hermetically sealed silicon photodiode. Silicon is the material of choice for applications where sensitivity and stability are important. Silicon also has a fast response and is efficient at collecting the charge created on the surface of the diode when light strikes it.

Photodiode technology continues to develop in response to challenges in the solar panel field, and sensor technology will benefit from these innovations, too. Davis instruments keeps pace with these changes and strives to offer the most advanced systems and state-of-the-art technology possible in its UV detectors. Whether you need a UV sensor for your weather station or part of a manufacturing process, Davis Instruments’ sensors will provide many years of accurate data collection.

• Multi-purpose temperature probe measures temperature of air, soil or water. Use with a Sensor Transmitter or EnviroMonitor Node (with RJ Connector Node, #6860). Can also be used with Weather Envoy or Vantage Connect to replace the “inside” temperature sensor.
• Measures temperatures as low as -40°F (-40°C) and as high as 150°F (65°C).
• Features an electronic sensor sheathed in black UV-stabilized plastic. Includes 25′ (7.6 m) cable.

• Multi-purpose temperature probe measures temperature of air, soil or water. Use with a Sensor Transmitter or EnviroMonitor Node. Can also be used with Weather Envoy or Vantage Connect to replace the “inside” temperature sensor.
• Features an electronic sensor sheathed in stainless steel. Comes with a 25-foot (7.6 m) cable.

• Anemometer for Weather Monitor II and Weather Wizard III.

• Temperature data updates every 10 seconds; humidity updates every minute.
• Fan provides aspiration rate of 190 feet/minute in full sun. On battery only, aspiration rate is 80 feet/minute. Supercapacitor and back-up batteries keep fan running 24 hours a day.
• Includes: 1) Motor-driven fan with solar panel and back-up batteries for 24 hour power. 2) Temperature and humidity sensors with a 25 foot (7,6 meter) cable. 3) Hardware for mounting on a fence post or pole
• Requires a Sensor Transmitter and a receiver, such as a wireless Vantage Pro2 console, WeatherLink Live, Vantage Connect or Weather Envoy; or an EnviroMonitor Node and EnviroMonitor Gateway.