◉ Field-proven reliability for pipeline quality gas and dry gas
◉ No line obstructions
◉ No moving parts
◉ No flow calibration required
◉ No pressure loss
◉ Bi-directional capability
◉ Large turn-down ratio
◉ No lubrication or periodic maintenance
◉ Measurement is not affected by gas properties
◉ Powerful noise-reduction technology
◉ Minimal installation requirement (10D upstream, 5D downstream)
Multisonic F3001 ultrasonic ﬂowmeter measures the ﬂow velocity of the gas via the transit times of ultrasonic pulses and calculates the ﬂow rate at measurement conditions therefrom. Here use is made of the fact that ultrasonic pulses move faster in the direction of ﬂow than in the opposite direction.
Each sensor is an emitter and a receiver at the same time. Measurements are taken alternatively in both di- rections, i.e. after a transit time has been measured, the emitter becomes the receiver and vice versa. In this way, the impact of the velocity of sound which depends on the gas type, pressure and temperature is eliminated. In order to take the ﬂow proﬁle into account, measure- ments are taken using a total of 6 acoustic paths in 3 parallel planes. In each plane, there are 2 paths crossing each other. The arrangement of paths according to Gauss-Chebyshev guarantees optimum measurements of the ﬂow velocity even in the case of asymmetries, swirl and crossﬂows. In addition, these variations of the ideal ﬂow proﬁle can also be measured, i.e. a ﬂow diagnosis can be made.