Introduction
The CALDON LEFM Ultrasonic Flowmeter Products are high-performance flowmeters designed to provide a rapid return on investment. These products have a rich history of innovation, starting from their first use in defense submarines in 1965 to their application in various industries such as nuclear, petroleum, and hydroelectric power.

Historical Milestones
The document outlines significant milestones in the development of CALDON LEFM products, including their first use in nuclear reactor coolant systems in 1975, the introduction of the eight-path LEFM in 1985, and the first reduced-bore LEFM for heavy crude oils in 2009.

Technology and Facilities
The Cameron Ultrasonics Technology Center in Pittsburgh, PA, serves as the hub for administration, sales, engineering, and manufacturing of LEFM products. The facility includes an oil flow calibration laboratory accredited to ISO 17025, ensuring high precision and reliability of the flowmeters.

Product Features
LEFM products utilize state-of-the-art transit time ultrasonic technology, which measures the velocity of liquid in a conduit by comparing the transit times of sound pulses traveling with and against the flow direction.

Industry Applications
CALDON LEFM products serve a wide range of industries, including nuclear and fossil fuel power plants, petroleum and gas, and hydroelectric and water management. Specific products include the LEFM CheckPlus systems for power plants and various flowmeters for petroleum and gas applications.

Calibration and Standards
The Hydrocarbon Calibration Laboratory in Pittsburgh is crucial for the success of CALDON products, offering the broadest capability for oil calibrations in North America. The laboratory's accreditation ensures that meter calibrations are transferable to field conditions without in-situ verification.

Conclusion
CALDON LEFM Ultrasonic Flowmeter Products, under the Schlumberger brand, continue to provide innovative and reliable solutions for flow measurement across multiple industries, backed by a commitment to quality and technological advancement.