industrial instrumentation basics

A level switch is different from a level transmitter in one important way: it doesn't measure level continuously — it simply tells you whether material has reached a specific point. That makes it one of the simplest, most reliable instruments in a plant, and one of the most common. This post covers what a level switch does, the main technologies used to build one, and where each type fits. What Is a Level Switch? A level switch detects when a liquid, powder, or granular material reaches a predetermined point in a vessel, and changes the state of an electrical contact (open to closed, or closed to open) when that point is reached. Unlike a level transmitter, which outputs a continuous signal proportional to level across a full range, a level switch is a point device — it only cares about one specific level, whether that's a high alarm, a low alarm, or an interlock trip point. Multiple switches are often installed at different heights in the same vessel to give high, high-h...

  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...