industrial instrumentation basics

  What is mass flow measurement Mass flow meter measures flow rate of the fluid through the pipe. Mass flow meter does not measure the volume. The mass flow rate is the mass of fluid that passes by a fixed point per unit of time. Mass of the fluid can be determine by using this type of flow meter. By measuring the density of fluid this flow meter measures the mass.  The Mass flow is proportional to density, cross-sectional area through which the substance is flowing, and velocity of fluid. This mass flow meter is very accurate and it is used to measure the flow of gases and fluids.  Types of mass flow meter What are the types of mass flow meter  How mass flow meter work Coriolis and thermal flow meters are two types of a mass flow meter. A mass flow meter is required for the accurate measurement of the mass related processes such as chemical reaction, heat transfer . Thermal flow meter In thermal flow meter a thermostat is used to measures the mass of the fluid fl...

Every flow meter is calibrated by the manufacturer for a specific set of service conditions before it ever reaches the field. How often — and how — it needs recalibration afterward depends heavily on the technology and the application: a DP transmitter on an orifice plate is calibrated very differently from a magnetic or Coriolis meter. This post covers both. Why Flow Meters Need Recalibration Recalibration needs depend heavily on how well the meter fits its application. Liquids that are corrosive, acidic, or abrasive gradually wear or coat internal components — orifice plate edges round off, electrodes foul, sensing diaphragms drift — and as that wear accumulates, measurement accuracy degrades even though the meter still produces a signal. Periodic calibration checks catch this drift before it turns into a real process or billing error. DP Transmitter (Orifice/Venturi) Calibration Procedure Most flow measurement in process plants is still DP-based — an orifice plate, venturi,...