News | March 26, 2020

Flow Technology Introduces In-Line Ultrasonic Meter For Ultra-Low-Flow Low Viscosity Liquid Application

Flow Technology, Inc. (FTI), a leading manufacturer of precision flow measurement instruments, systems and calibrators, has introduced the QLF Series in-line ultrasonic flow meter for use in ultra-low-flow low viscosity liquid applications.

The QLF meter’s high accuracy and repeatability is achieved through the unique measurement section within the meter body where flow is conditioned and Delta T measured along its axis. The meter’s principle of operation measures the time difference of an ultrasonic wave traveling with and against the flowing medium. The time difference is directly proportional to the fluid’s flow rate. Temperature is measured via an RTD embedded into the flow meter body.

The QLF in-line ultrasonic flow meter is a compact, rugged, versatile, cost-effective solution for measuring ultra-low flow in a number of industries, such as aerospace, agricultural, automotive, chemical, oil & gas, industrial, and pharmaceutical. The meter’s construction makes it the meter of choice for many high purity and corrosive fluids. Typical measurement application examples include: Small engine fuel consumption; chemical injection systems; water treatment chemical skids and sample stations for cooling towers, boilers and membrane filtration systems; aircraft fuel flow stands; diesel exhaust fluid (DEF) consumption; liquid chromatography; and side stream filtration.

“The QLF’s construction, excellent accuracy, and ability to measure very low flow rates of clean, low viscosity liquid make it a great fit for a range of applications and industries,” said Matt Zajac, Flow Technology marketing manager.

The compact QLF ultrasonic meter has no moving parts, non-wetted sensors and no obstructions in the flow stream to cause in increase in pressure drop. Available for 1/8-inch piping, the meter’s flow range is 0.001 to 3.5 GPM. It is accurate to +/-0.5% of reading plus zero stability, and repeatability is +/-0.2% over 10:1 turndown. The meter handles a temperature range of 14°F to 176°F (-10°C to 80°C) and has analog, scaled frequency and Modbus RTU outputs.

For more information about the QLF Series in-line ultrasonic flow meter, please visit

About Flow Technology, Inc.
With over 50 years of flow measurement experience, Flow Technology, Inc., maintains the highest standards of quality in design, manufacturing and service. Its product line includes a wide range turbine, positive displacement, electromagnetic, in-line and clamp-on ultrasonic flow meters; flow calibrators, flow controllers and ancillary electronics. Typical applications are found in the aerospace, automotive, industrial, metrology, oil & gas, and sanitary fields. In addition, the company maintains one of the world’s largest primary standard flow meter calibration technologies, and provides complete flow meter calibration, service and repair. Flow Technology, Inc., is registered to ISO 9001 & AS9100, accredited by NVLAP, and has calibration conformance to ISO/IEC 17025, MIL-STD-45662A and ANSI Z 540. For more information, visit

Source: FTI Flow Technology, Inc.