•Mechanical and electrical Flow meter
In vortices-shedding meters, an obstruction, known as a bluff Body, is placed inside the pipe. Typically, the width of the Obstruction is one-quarter the diameter of the pipe.as liquids or gases with suitably low viscosity flow through the Meter body, a vortex is shed on one side of the obstruction. In the formation of the vortex, fluid velocity increases while Pressure drops. On the opposite side of the bluff, the effect is reversed (i.e., higher pressure, lower velocity), leading to the subsequent creation of a vortex on that side. The pattern Repeats continuously. Sensors used to measure the pressure changes are located on the face of the bluff, its sides, its rear, or downstream. Among the sensors typically used for this are thermistor elements, spherical magnetic shuttles, or pressure detectors of various types. Additionally, piezoelectric crystals can be used to detect the shedding forces on the bluff body. Heavy duty stainless steel case suitable for adverse service conditions where pulsation or vibration exists. The glycerin filling of the case protects the measuring systems against wear by pulsating pressures and mechanical vibration; at the same time it provides lubrication of the moving parts.
The turbine flow consists of a turbine rotating in the liquid flow around an axis and translates it into a user-readable rate of flow .The turbine tends to have all the flow traveling around it. The turbine wheel is set in the path of a fluid stream. The flowing fluid impinges on the turbine blades, imparting a force to the blade surface and setting the rotor in motion. When a steady rotation speed has been reached, the speed is proportional to fluid velocity. Turbine flow meters are used for the measurement of natural gas and liquid flow. Turbine meters are less accurate than displacement and jet meters at low flow rates, but the measuring element does not occupy or severely restrict the entire path of flow.
It uses a magnetic field applied to the metering tube, which results in a potential difference proportional to the flow velocity perpendicular to the flux lines. The potential difference the magnetic flow meter requires a conducting fluid and a no conducting pipe liner. The electrodes must not corrode in contact with the process fluid; some magnetic flow meters have auxiliary transducers installed to clean the electrodes in place. The applied magnetic field is pulsed, which allows the flow meter to cancel out the effect of stray voltage in the piping system.
There are two main types of Ultrasonic flow meters: Doppler and transit time. While they both utilize ultrasound to make measurements and can be non-invasive (measure flow from outside the tube, pipe or vessel), they measure flow by very different methods.
•Ultrasonic transit time flow meter
measure the difference of the transit time of ultrasonic pulses propagating in and against the direction of flow. This time difference is a measure for the average velocity of the fluid along the path of the ultrasonic beam. By using the absolute transit times both the averaged fluid velocity and the speed of sound can be calculated.
•Ultrasonic Doppler flow meter
measure the Doppler shift resulting from reflecting an ultrasonic beam off the particulates in flowing fluid. The frequency of the transmitted beam is affected by the movement of the particles; this frequency shift can be used to calculate the fluid velocity. For the Doppler principle to work there must be a high enough density of sonically reflective materials such as solid particles or air bubbles suspended in the fluid. This is in direct contrast to an ultrasonic transit time flow meter, where bubbles and solid particles reduce the accuracy of the measurement. Due to the dependency on these particles there are limited applications for Doppler flow meters.
uses light to determine flow rate. Small particles which accompany natural and industrial gases pass through two laser beams focused a short distance apart in the flow path. In a pipe by illuminating optics. Laser light is scattered when a particle crosses the first beam. The detecting optics collects scattered light on a photo detector, which then generates a pulse signal. As the same particle crosses the second beam, the detecting optics collect scattered light on a second photo detector, which converts the incoming light into a second electrical pulse. By measuring the time interval between these pulses, the gas velocity is calculated
Thermal mass flow meters generally use combinations of heated elements and temperature sensors to measure the difference between static and flowing heat transfer to a fluid and infer its flow with a knowledge of the fluid's specific heat and density. Today, thermal mass flow meters are used to measure the flow of gases in a growing range of applications, such as chemical reactions or thermal transfer applications that are difficult for other flow metering technologies. This is because thermal mass flow meters monitor variations in one or more of the thermal characteristics (temperature, thermal conductivity, and/or specific heat) of gaseous media to define the mass flow rate.
•Venturi tube flow meter
A Venturi meter constricts the flow in some fashion, and pressure sensors measure the differential pressure before and within the constriction. This method is widely used to measure flow rate in the transmission of gas through pipelines.
An orifice plate is a plate with a hole through it, placed in the flow; it constricts the flow, and measuring the pressure differential across the constriction gives the flow rate. It is basically a crude form of Venturi meter, but with higher energy losses. There are three type of orifice: concentric, eccentric, and segmental.
While all flow switches are flow meters, not all flow meters are flow switches because they are not all equipped with the ability to control the flow rate, but simply to measure it. Flow switches are used to monitor fluid or gas flow while it is passing through its valve body, then to send an electrical control sign if the flow rate is too high or too low. The signal is sent as a safety measure to another device, such as a pump, that will respond accordingly.
That are procured from trusted vendors in the market. These switches are used to detect the incoming flow or movement of the existing liquid in the pipe. They are widely used for applications like servicing water systems, heating systems, air conditioning etc. They are available in various dimensions as per the demands of the clients.
Are used for detecting the flow rate in the liquids and gases. They are made using premium quality materials and are widely appreciated by our clients for their varied features. They can be custom made and available in various specifications as per the requirements of the clients. They are used in various applications in different industries for their utility and efficiency.
To provide both visual flow rate indication and monitoring capabilities for liquids and gases. Designed for vertical, upward flow applications, these switches are offered in either a brass or stainless steel version. As the flowing media moves upward, the meter's float is lifted to a level of equilibrium at which the weight of the float is equal to the upward force of the media. The upper edge of the float indicates the flow rate on the measuring glass. When the flow rate reaches the preselected set point, a permanent magnet contained in the float actuates the reed switch.
Sensing Element A continuously measures the temperature of the flowing media, maintaining an appropriate temperature differential to element B. Element B is heated to a significant (i.e. 50 F) differential above Element A. As the flowing media passes over Element B some of the heat is transferred from Element B into the cooler flow stream. The rate of heat transfer is proportional to the mass velocity of the media. In other words, if the velocity increases, Element B will lose more heat. As Element B loses heat, more electrical energy is required to maintain the preset temperature differential between the two elements.