News and Articles

The Basics of Evapotranspiration

Evapotranspiration (ET) represents the loss of water from the Earth’s surface from the combination of direct evaporation and plant transpiration. ET is usually expressed as a rate such as inches per day. Knowledge of ET is important for irrigation scheduling but it is also an important factor for other land use applications such as septic… Read more

Meteorology Sensors Overview

Weather conditions are often an integral element in water resource and irrigation management applications. Weather parameters are frequently used in understanding and modelling environmental applications that are dependent on water resources. Stevens provides top quality and industry leading weather sensors that are easily deployed into an integrated environmental monitoring and control system. Here is an… Read more

Soil Sensors Overview

As a leader in soil monitoring instrumentation, Stevens offers portable and in-situ sensors to measure moisture,  EC (salinity), temperature and matric potential. Moisture, EC and Temperature – In-Situ Used in more water supply forecast and climatological networks than any other soil sensor. The most scientifically researched soil sensor available. RELIABLE: Continual, long-term data without calibration.RUGGED:… Read more

Water Quality Sensors Overview

Stevens offers a range of single parameter and multi-parameter water quality sensors to meet your unique monitoring needs. Shortcuts Ambient Light/PAR PAR stands for Photosynthetically Active Radiation, and is a specific type of ambient light. An ambient light sensor is also a PAR sensor. Ambient light measurement, in the context of water quality monitoring, is… Read more

Staff Gages Overview

Stevens’ environmentally rugged staff gages provide a quick and easy visual indicator of water level and flow. Every water level monitoring station should include a staff gage from which the height of the water may be visually and easily compared to any data logger’s reported measurement. Enamelled iron gages are preferred over other type gages… Read more

Water Level Sensors Overview

Stevens is the original water level measurement instrumentation company with the introduction of the widely known chart recorders introduced in 1911. Today, Stevens offers a wide selection of water level measurement sensors including robust ceramic pressure sensors, shaft encoders, acoustical sensors, and visual reference staff gages. Stevens still offers the low-powered, mechanical chart recorders for… Read more

Protecting Remote Monitoring Sites from Lightning Damage

Protecting monitoring sites from lightning damage is an important consideration for monitoring equipment and stations that are deployed in areas that are prone to lightning strikes. Even lightning that does not directly strike a site may cause damage by traveling through the ground and into buried sensors or cable. Proper planning for such events can… Read more

A Brief History of Stevens’ 116 Year Chart Recorder Legacy

The legendary mechanical chart recorder for environmental monitoring dates back to 1911, when John C. Stevens invented the Type A chart recorder. In 1906, J.C. Stevens was the Hydrographer for the USGS out of Portland, Oregon, and was soon promoted to District Engineer. While with the USGS, he realized that hiring local citizens to observe… Read more
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