AMS Instrumentation and Calibration says its Sentinel ultrasonic flowmeter is designed to meet AGA9 accuracy requirements for natural gas custody transfer, and NMI pattern approval.
According to AMS, ultrasonic transducers are installed in the Sentinel flowmeter body, one upstream of the other, with the transducers sending and receiving ultrasonic pulses through the fluid. This fast sampling ensures that system accurately measures flow under dynamic and pulsating flow conditions.
The Sentinel ultrasonic flowmeter is said to measure the difference between the upstream and downstream transit times, and uses digital signal processing and correlation detection to calculate velocity and volumetric flow rate.
AMS says the Sentinel T11 transducer is specifically designed for natural gas applications, providing a simplified, yet cost effective metering system without exposing the user to any additional risk in measurement uncertainty.