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Open-File Report 2013–1173

Laboratory Evaluation of the Level TROLL 100 Manufactured by In-Situ Inc.—Results of Pressure and Temperature Tests

By Mark V. Carnley, Janice M. Fulford, and Myron H. Brooks

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The Level TROLL 100 manufactured by In-Situ Inc. was evaluated by the U.S. Geological Survey (USGS) Hydrologic Instrumentation Facility (HIF) for conformance to the manufacturer’s accuracy specifications for measuring pressure throughout the device’s operating temperature range. The Level TROLL 100 is a submersible, sealed, water-level sensing device with an operating pressure range equivalent to 0 to 30 feet of water over a temperature range of −20 to 50 degrees Celsius (°C). The device met the manufacturer’s stated accuracy specifications for pressure within its temperature-compensated operating range of 0 to 50 °C. The device’s accuracy specifications did not meet established USGS requirements for primary water-stage sensors used in the operation of streamgages, but the Level TROLL 100 may be suitable for other hydrologic data-collection applications. As a note, the Level TROLL 100 is not designed to meet USGS accuracy requirements. Manufacturer accuracy specifications were evaluated, and the procedures followed and the results obtained are described in this report. USGS accuracy requirements are routinely examined and reported when instruments are evaluated at the HIF.

First posted September 25, 2013

For additional information contact:
Chief, Hydrologic Instrumentation Facility
U.S. Geological Survey
Building 2101, Room 154
Stennis Space Center, MS 39529

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Suggested citation:

Carnley, M.V., Fulford, J.M., and Brooks, M.H., 2013, Laboratory evaluation of the Level TROLL 100 manufactured by In-Situ Inc.—Results of pressure and temperature tests: U.S. Geological Survey Open-File Report 2013–1173, 12 p.,




Description of the Level TROLL 100


Measurement Units and Conventions for Pressure



References Cited

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