ENDRESS+HAUSER  8DF08-AG15AAAAA70M

Area of Application

• Measuring principle operates independently of physical fluid properties such as viscosity or density
• Accurate measurement of compressed natural gas (CNG) in high-pressure refueling applications

Device properties

• Flow rates up to 150 kg/min (330 lb/min)
• Process pressure up to 350 bar (5080 psi)
• Rupture disc available
• Device in compact or remote version
• Flexible outputs and Modbus RS485
• Transmitter for custody transfer

Your benefits

• Excellent operational safety - reliable under extreme process conditions
• Fewer process measuring points – multivariable measurement (flow, density, temperature)
• Space-saving installation – no in/outlet run needs
• High flexibility in system integration - wide range of communication interfaces
• Fast commissioning – pre-configured devices
• Automatic recovery of data for servicing

Measuring principle

The measuring principle is based on the controlled generation of Coriolis forces. These forces are always present when both translational and rotational movements are superimposed.

The amplitude of the Coriolis force depends on the moving mass Δm, its velocity v in the system, and thus on the mass flow. Instead of a constant angular velocity ω, oscillation occurs.

In the sensor, two parallel measuring tubes containing flowing fluid oscillate in antiphase, acting like a tuning fork. The Coriolis forces produced at the measuring tubes cause a phase shift in the tube oscillations (see illustration):

• At zero flow, in other words when the fluid is at a standstill, the tubes oscillate in phase (1).two
• Mass flow causes deceleration of the tube oscillation at the inlet (2) and acceleration at the outlet (3).

The phase difference (A-B) increases with increasing mass flow. Electrodynamic sensors register the tube oscillations at the inlet and outlet. System balance is ensured by the antiphase oscillation of the two measuring tubes. The measuring principle works independently of temperature, pressure, viscosity, conductivity and flow profile.