Wednesday, October 18, 2017

Tips For Best Control of Low Flow Rates

coriolis low flow measurement and control instrument
Low flow measurement and control instrument uses
Coriolis flow measurement sensor.
Image courtesy Brooks Instrument
Coriolis mass flow measurement is the method of choice for applications requiring best accuracy under very low flow conditions. The Quantim Series of mass flow controllers from Brooks Instrument provide indication of fluid flow, density and temperature for applications down to 0.001 Kg/hr. The instrument, in addition to a Coriolis flow sensor, provides digital signal processing, an integral or close coupled control valve, and PID control to deliver a total flow control solution in an integrated package.

Obtaining best available performance on a consistent basis is supported by a well done installation.

  • Mount the instrument to a stable surface free from excessive mechanical shock and vibration that might impact performance.
  • Locate the device where it can be easily accessed or removed.
  • Install an appropriate filter on the fluid inlet side.
  • Provide a positive shutoff valve on the downstream side to enable zeroing after installation.
  • Make sure the process flow direction matches the required flow direction of the instrument.
The sensor and control valve are designed to function properly when filled with process fluid. This means your installation cannot deliver entrapped gas in a liquid or liquid droplets in a gas. If compressed gas is used to force dosing fluids through a system, it may be necessary to provide a degassing arrangement upstream of the flow controller. Dissolved gas that flashes due to a pressure drop through the instrument can form bubbles that distort sensor and valve performance. 

Little to no maintenance is required after the instrument is installed and zeroed. The inlet filter should be changed at intervals sufficient to assure delivery of clean process fluid to the instrument.

More technical detail on the Quantim Coriolis flow measurement and control instruments is provided in the document below. Whatever your flow measurement or control application, share your challenge with measurement and control specialists, combining your own knowledge and experience with their product application expertise to leverage an effective solution.