Leomi

Leomi-High quality professional Insertion Thermal Mass Flow Meter and Thermal Mass Flow Meter services Provider Company in India, More Information visit our website www.leomi.in

Leomi-Top quality professional Insertion Thermal Mass Flow Meter and Thermal Mass Flow Meter services Provider Company in India, More Information visit our website www.leomi.in

Leomi-Top quality professional Insertion Thermal Mass Flow Meter Company in India

Leomi-Top quality professional Insertion Thermal Mass Flow Meter and Thermal Mass Flow Meter services Provider Company in India, More Information visit our website www.leomi.in

Gas mass flow measurement is always a challenge in process conditions. There are very few flow technologies available for achieving it such as Coriolis, Calorimetric ( Thermal Mass) etc..Gas volume varies with respect to temperature and pressure as per Charles & Boyle’s law but Gas mass remains constant. This is the main reason to measure actual mass flow rate is important to monitor in processes.

Let’s understand the difference between Standard & Actual Flow Rate first.

STANDARD FLOW RATES

Standard flow rate is a flow rate of gas at specific pressure and temperature conditions. It is dependent on pressure and temperature conditions. It is termed as Standard volumetric (Sm3/hr or SCFM) or Standard Mass flow rate (Kg/hr at specific standard conditions).

There are different standards conditions used internationally such as :

ISO2533 (1.01325bara @ 15°C );

DIN 1343 ( 1.01325bar @ 0°C);

Standard (1.01325bar @ 20°C) etc. (above with 0% relative humidity conditions generally or sometime varying conditions )

ACTUAL FLOW RATES

Actual Flow rate is a flow rate of gas at different pressure and temperature conditions, It is independent of pressure and temperature conditions. It is termed as Actual Volumetric ( Am3/hr or ACFM ) or Actual Mass Flow Rate (Kg/hr at actual process conditions)

IMPORTANCE OF ACTUAL MASS FLOW RATE MEASUREMENT

As per Charles Law states that at constant pressure ideal gas volume increases with increase in temperature or gasses expands when heated.

And Bolye’s Law states that at a constant temperature ideal gas volume is inversely proportional to pressure applied on the gas. It implies at constant temperature volume increases when pressure decreases and gas volume decreases when pressure increases.

From above laws we understand that measuring volumetric gas flow rate gives a huge measurement error due to the fact that gas volume varies with changing temperature & pressure conditions.

Therefore, we must measure the actual mass flow rate of gas for an accurate measurement for controlling the process conditions.

Leomi 587 Insertion Thermal Mass Flow Meter for Actual Mass / Volume Flow Rate measurement is developed considering the process industry’s real requirement for optimizing process conditions with accurate and real measurement.

Different Types of Gas Flow Meters

Thermal mass flowmeters:- Thermal mass flow meters are by far the most popular instruments for determining the mass flow of low gas flow. Since the introduction of these instruments in the mid-1970s, they have undergone considerable development, from analog to digital, from low flow to higher flow, from applications in laboratories and machines to industrial environments and even hazardous areas. There is a suitable thermal mass flow meter for almost every low-flow gas application.

Differential Pressure Based Flow Meter:- Differential pressure meters work on the principle of partially obstructing the flow in a pipe. This creates a difference in the static pressure between the upstream and downstream side of the device. This difference in the static pressure (referred to as the differential pressure) is measured and used to determine the flow rate.

Coriolis flowmeter:- Coriolis flowmeter is based on the principles of motion mechanics. As fluid moves through a vibrating tube, it is forced to accelerate as it moves toward the point of peak-amplitude vibration. Conversely, decelerating fluid moves away from the point of peak amplitude as it exits the tube. The result is a twisting reaction of the flow tube during flowing conditions as it traverses each vibration cycle.

Turbine flow meter:- Turbine Flow Meter is a volumetric measuring turbine type. The flowing fluid engages the rotor causing it to rotate at an angular velocity proportional to the fluid flow rate. The angular velocity of the rotor results in the generation of an electrical signal (AC sine wave type) in the pickup.

Ultrasonic Flow Meter – Clamp On Type:- An ultrasonic flow meter construction can be done by using upstream and downstream transducers, sensor pipes, and reflectors. The working principle of the ultrasonic flow meter is, it uses sound waves to resolve the velocity of a liquid within a pipe. There are two conditions in the pipe like no flow and flowing. In the first condition, the frequencies of ultrasonic waves are transmitted into a pipe & its indications from the fluid are similar. In the second condition, the reflected wave’s frequency is dissimilar because of the Doppler Effect.

Vortex Flow Meter:-  A vortex flow meter is a flow measurement device best suited for flow measurements where the introduction of moving parts presents problems. They are available in industrial grade, brass, or all-plastic construction. Sensitivity to variations in the process conditions are low and with no moving parts have relatively low wear compared to other types of flow meters.