Flow Indicator

Flow Indicator


Flow indicators are devices, which are used to measure the volume of fluids or gases within a system. These components can be employed to quantify open channels like rivers, lakes, or in several chemical industries.

A sight flow indicator has a window, which allows operators to have a visual and verify the flow of liquids in various directions. This is a simple low-cost operation that enables the operative to see the color, consistency, clarity, viscosity along with other fluid characteristics. They are usually fitted with material that moves along with the flow this enables them to been seen easily. The bodies of these components are constructed utilizing a specific metal. Windows in the system are produced from special glass disks exhibiting a gasket assembly. The glass windows can be fused inside a metal frame or in tubular glass. In certain cases, polymer glass windows are also utilized.

What does a flow indicator controller do?

Flow control indicator is used in systems, which require a constant flow rate and can withstand varying pressure changes. These controllers compensate for any changes, which, incur in the pressure setting based on a signal sent by the controller. This allows for a better and stable flow rate in the system. They also exhibit a high level of accuracy along with repeatability. It is advisable to use a liquid flow sample that will easily match with the application leading to zero friction with the design. Their ability to be used with a touchscreen makes it highly versatile in different settings. These components can be utilized for various applications, namely sample flow regulation, on-demand chemical dilution, blending, and consumable usage monitoring.

What is the difference between volumetric flow and mass flow?

The components in both these flow rates exhibit their own cons and flaws. Below are some details, which will help you in selecting the correct modules.

  • Volumetric flow

The components follow a 3-dimensional measurement of the space occupied by gas as it passes through an instrument kept to measure temperature and pressure conditions. It can also be referred to as the actual flow rate. The measuring units of the system is meters3 /second, milliliters/second, or feet3/hour. This method is dependent on the weight along with pressure and temperature changes.

  • Mass Flow

It is a measurement of the number of molecules moving through the instrument without checking the space each molecule occupies. It is generally expressed as a standardized volumetric flow rate. The units used in measuring them per unit of time are pounds/hour or kilograms/second. Changes in weight, temperatures, and pressures directly don’t affect their functionality.

How does a flow indicator work?

These components are designed to measure the number of fluids or gases, which pass through the sensors. These elements have 3 main components a primary device, transducer, and transmitter. The transducer checks the flow through the primary device and passes a signal. The transmitter forwards the signal to the operator. There are different types of indicators for different systems. Capillary thermal mass, vortex shedding, and transit-time ultrasonic are the most common amongst them. However, the main goal of these systems is to provide accurate and repeatable flow readings.

How is flow rate calculated?

The formula used to calculate flow rate is Q = AV. Here Q is the flow rate, A is the cross-sectional flow area, and V is the velocity of the fluid at that point. Calculating A in most cases is difficult, so an approximate value has to be taken. The SI unit of flow rate in m3/s.
In some cases, the rate of flow can be articulated depending on the time (t) and the capacity to store the fluid (C). Q=C/T. Both these formulas have many applications in several fluid dynamics and can be employed to calculate velocity, flow rate, etc.

What are the three types of sight glass?

Sight glass can be generally classified as bullseye or columnar, however, there are some variations in other components, which will help consumers decide the best options.

  • Bullseye

These components have a sight glass, which is installed via drilling over the top of the tank, which are later threaded. Some of these components have fluids levels marked on them.

  • Columnar

These vertical components are mounted outside tanks, which enables users to observe a larger sample. They are difficult to install and are mounted at the bottom of the tank making, them susceptible to damage.

  • BS&W bowls

These elements are mounted at the bottom of tanks using metal to attach them to metallic contaminants.