The U.S. Geological Survey (USGS) in South Carolina has worked with products from Hach Environmental for many years. Currently, the USGS uses the OTT Kalesto radar level sensor-a non-contact method of measuring water levels-on medium to large rivers throughout the state.

Using sophisticated radar technology, the OTT Kalesto radar level sensor provides continuous, unattended monitoring of surface-water level without getting wet. This innovative sensor is the ideal instrument for monitoring in remote and hard-to-reach places as it operates continuously, using a single 12-volt battery and solar recharge.

“It was immediately clear that radar technology is the least likely to have mishaps, such as being hit by debris,” notes Tim Lanier of the USGS office in Columbia, South Carolina. With other water-level measuring instruments, there was still the need for the instrumentation to be in physical contact with the water. Radar technology allows non-contact monitoring, thus damage caused by high water or adverse affects of silt accumulation, debris, plant growth, etc. is unlikely. This non-contact technology enables the sensor to provide measurements with long-term stability, even in contaminated water.

The OTT Kalesto is easy to both install and maintain. The instrument is simply mounted to the underside of a bridge, over the water to be monitored. Data collection is also convenient, as the instrument's digital interface can transfer data to an external logger up to 3,000 feet away via RS485 or SDI-12 interface.

The OTT Kalesto features a range of 5 to 99 ft (1.5m - 30m); accuracy of +/- 0.03 ft over the complete measuring range; and resolution of 0.01 ft (1 mm). The unit operates in temperatures from -40°F to +185°F and includes weatherproof housing, components (including the antenna), a sealed, nitrogen-filled enclosure, and standard integral lightning protection.

For more information on the OTT Kalesto radar level sensor, visit the Radar Level Sensor page, or contact your Hach Environmental representative today.