 | Claim Listing
If this is your listing you must be registered and logged in to claim. If you are logged in you will see an icon similar to this  to the left that you will click to claim the listing. Once a listing has been claimed it can be edited. You must be logged in to edit a listing. |
| Environmental Technology Listing |
Title of Listing: | | VadoScan Systems |
Category: | | Characterization Technologies |
Subcategory: | * | Air, Soil, All Listings |
Media: | | Soil, Soil Gas, Air Vapors |
Contaminants: | | Non-Halogenated Volatiles, BTEX, Oxygen, Temperature, Pressure |
Web Site: | | http://www.biorenewal.com |
Email: | | info@biorenewal.com |
Technology Description: | |
VadoScan Systems sensors allow for unattended monitoring of vadose parameters including oxygen, petroleum hydrocarbons, temperature, and pressure. The sensors can either be hung inside existing monitoring wells with screened intervals that extend into the vadose zone or buried directly in the soil. Each sensor is connected by cable to a miniature data logger located at the surface. The data logger is small enough to be easily housed inside the standard sized vaults typically used for flush-mount well construction. Up to 502 measurements are recorded by the data logger at user-specified intervals ranging from 5 seconds to 24 hours. The data are retrieved from the logger by downloading to a lap-top or palm-top computer. Data can be transferred to standard spreadsheet programs for management and presentation purposes.
The oxygen sensor is based on an electrochemical reaction that generates a potential difference between two electrodes. The magnitude of the potential difference between the two electrodes is a function of the oxygen concentration. The potential difference, expressed in mV, is recorded by the data logger at the user-specified intervals. The oxygen sensor was developed, tested, and field-validated by the Unocal Environmental Technology Group in Brea, California.
The hydrocarbon sensors are based on polymer absorption resistor technology commonly used for leak detection. The Adsistor sensor is a resistor that is coated with a non-conductive polymer which holds in place conductive particles. As petroleum hydrocarbons adsorb onto the polymer surface, the distance between the conductive particles increases. As a result, the electrical resistance across the Adsistor increases. The hydrocarbon sensors have been evaluated by the Carnegie Mellon Research Institute on behalf of the U.S. EPA.
|
| | |
Performance Status/
Limitations: | |
The oxygen sensor measures the partial pressure of oxygen in a gas. As such, a change in pressure (e.g., turning on a blower at a bioventing site) will cause a change in the measured oxygen concentration. The software package does allow the pressure offset to be entered into the calibration routine, thereby corrected for the pressure difference. In addition, the oxygen sensor is sensitive to ammonia and ozone. The hydrocarbon sensor output, measured as resistance, is proportional to hydrocarbon concentrations above 300 ppm. The hydrocarbon sensor is more sensitive to the higher molecular weight hydrocarbons than the lower molecular weight hydrocarbons. The maximum sensor installation depth is 75 feet.
Sensitivity to ammonia and ozone refers to significant concentrations.
|
Topics
Air Sampling/Modeling, Technologies, Characterization
Additional Topics/Tags/Keywords
Leak Detector, VOCs, Hydrocarbon, Soil |
Organization: | | BioRenewal Technologies Inc. |
Address: | | 2800 S. Fish Hatchery Road
| Phone: | Description | Number |
City: | | Madison | | Primary | (608) 276-8980 |
State/Province/Territory: | | WI | 2. | | |
Zip/Postal Code: | | 53711 | 3. | | |
Country: | | United States | 4. | Fax: | (608) 273-6989 |
Branch Locations: | |
|
|
|