# Flow Measurement **URL:** https://forumautomation.com/c/field-instrumentation/flow-measurement/39.md [Latest](https://forumautomation.com/latest.md) · [Categories](https://forumautomation.com/categories.md) · [Tags](https://forumautomation.com/tags.md) --- ## [Working of Rotameter / Variable area flowmeter](https://forumautomation.com/t/working-of-rotameter-variable-area-flowmeter/2978)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [January 15, 2018, 3:06pm UTC](https://forumautomation.com/t/working-of-rotameter-variable-area-flowmeter/2978 "2018-01-15T15:06:13Z")
What is a rotameter? Rotameter is variable area flowmeter used to measure fluid flow. It works on the principle of upthrust force exerted by fluid and force of gravity. The buoyant force exerted on an immersed object i… --- ## [How to choose a Flowmeter?](https://forumautomation.com/t/how-to-choose-a-flowmeter/7609)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 1\ **Last updated:** [September 2, 2020, 7:20am UTC](https://forumautomation.com/t/how-to-choose-a-flowmeter/7609 "2020-09-02T07:20:39Z")
Flowmeters are very important equipments installed for process flow measurement. The key to success is to select the right flow meter while choosing the wrong one means nothing but trouble. There are many criteria sh… --- ## [What are the Types of Flow?](https://forumautomation.com/t/what-are-the-types-of-flow/973)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [April 10, 2016, 1:05am UTC](https://forumautomation.com/t/what-are-the-types-of-flow/973 "2016-04-10T01:05:21Z")
Types of Flow 1.Steady Flow A flow is said to be steady when Pressure,Velocity,Temperature.Do not change with time at a point in the fluid. 2.Unsteady flow A flow is said to be unsteady when temperature,pressure,velo… --- ## [What is a venturi meter and how does it work](https://forumautomation.com/t/what-is-a-venturi-meter-and-how-does-it-work/8455)
**Author:** [@ashlin](https://forumautomation.com/u/ashlin)\ **Replies:** 1\ **Last updated:** [August 19, 2020, 5:29am UTC](https://forumautomation.com/t/what-is-a-venturi-meter-and-how-does-it-work/8455 "2020-08-19T05:29:22Z")
What is a venturi meter and where is it used A venturi meter is a device that can be used to measure the fluid flow in a pipeline. The flow velocity of the fluid can also be increased by using a venturi meter. A ventu… --- ## [Working principle of magnetic flowmeter](https://forumautomation.com/t/working-principle-of-magnetic-flowmeter/2749)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 1\ **Last updated:** [December 29, 2025, 9:00am UTC](https://forumautomation.com/t/working-principle-of-magnetic-flowmeter/2749 "2025-12-29T09:00:42Z")
Magnetic flowmeter works on the principle of electromagnetic induction. When an electrical conductor moves perpendicular to a magnetic field, a voltage is induced in that conductor perpendicular to both the magnetic flux… --- ## [Basics of Orifice plate pressure transmitter](https://forumautomation.com/t/basics-of-orifice-plate-pressure-transmitter/2563)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [November 3, 2017, 4:17pm UTC](https://forumautomation.com/t/basics-of-orifice-plate-pressure-transmitter/2563 "2017-11-03T16:17:43Z")
An Orifice plate is a differential pressure transmitter used to measure the flow rate of fluid passes through a pipeline. A differential pressure transmitter makes a restriction in the flow channel which makes a press… --- ## [Best practices for Differential Pressure Flow measurement instrument installation](https://forumautomation.com/t/best-practices-for-differential-pressure-flow-measurement-instrument-installation/2196)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [August 13, 2017, 5:12pm UTC](https://forumautomation.com/t/best-practices-for-differential-pressure-flow-measurement-instrument-installation/2196 "2017-08-13T17:12:16Z")
Flow measuring instrument installation guideline 1.Keep impulse piping as short as possible 2.For liquid service,slope the impulse piping at least 1 inch per foot upward from the transmitter towards the process connect… --- ## [Different between Nm3/h = m3/h?](https://forumautomation.com/t/different-between-nm3-h-m3-h/2408)
**Author:** [@abdo2013](https://forumautomation.com/u/abdo2013)\ **Replies:** 0\ **Last updated:** [October 8, 2017, 1:55pm UTC](https://forumautomation.com/t/different-between-nm3-h-m3-h/2408 "2017-10-08T13:55:05Z")
The N stands for Normal. It means it was measured at standard temperature and pressure. Because the volume of gasses change with temperature or pressure, it is necessary to specify the temperature and pressure the flow … --- ## [Understand the basics of Orifice Plate](https://forumautomation.com/t/understand-the-basics-of-orifice-plate/1457)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [October 22, 2016, 4:05pm UTC](https://forumautomation.com/t/understand-the-basics-of-orifice-plate/1457 "2016-10-22T16:05:59Z")
Orifice Plate The orifice plate is the most popular primary device (Flow Measurement). Orifice plates are applicable to all clean fluids. Orifice plates are not good for the measurement of fluid containing solids in s… --- ## [What are the different types of flow elements? Advantages and Disadvantages of various type of flow element](https://forumautomation.com/t/what-are-the-different-types-of-flow-elements-advantages-and-disadvantages-of-various-type-of-flow-element/2197)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [August 13, 2017, 9:18pm UTC](https://forumautomation.com/t/what-are-the-different-types-of-flow-elements-advantages-and-disadvantages-of-various-type-of-flow-element/2197 "2017-08-13T21:18:10Z")
Different type of Flow element 1.Differential Pressure Orifice plate Pitot Venturi Advantages - Simple,No moving parts. Disadvantages - Susceptible to wear in dirty services except vertically. Orifice edge sharpness … --- ## [Thermal mass flowmeter](https://forumautomation.com/t/thermal-mass-flowmeter/3043)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [January 27, 2018, 8:08pm UTC](https://forumautomation.com/t/thermal-mass-flowmeter/3043 "2018-01-27T20:08:24Z")
Principle: Thermal mass flow meters are most commonly used for measuring the flow of gases, which is operated by the cooling effect of the gases stream. The operating principle is based on conductive and convective he… --- ## [Positive Displacement flowmeters](https://forumautomation.com/t/positive-displacement-flowmeters/3004)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [January 19, 2018, 6:10pm UTC](https://forumautomation.com/t/positive-displacement-flowmeters/3004 "2018-01-19T18:10:46Z")
Positive Displacement (PD) flowmeters are types volumetric flow meters. PD flowmeters work in a cyclic process, in each cyclic precisely defined (“positive”) quantity of fluid is entrapped in its chamber using a mechanic… --- ## [What is strainers and installation of strainer?](https://forumautomation.com/t/what-is-strainers-and-installation-of-strainer/6419)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 1\ **Last updated:** [June 7, 2019, 4:24pm UTC](https://forumautomation.com/t/what-is-strainers-and-installation-of-strainer/6419 "2019-06-07T16:24:05Z")
What is strainer? Strainers are important components of piping systems to protect equipment from harm caused by dust and other objects that the process liquid can carry. Simply strainers are kind of filter that is in… --- ## [Advantages and Disadvantages of Vortex Flow meters](https://forumautomation.com/t/advantages-and-disadvantages-of-vortex-flow-meters/268)
**Author:** [@automate](https://forumautomation.com/u/automate)\ **Replies:** 2\ **Last updated:** [May 13, 2025, 12:21am UTC](https://forumautomation.com/t/advantages-and-disadvantages-of-vortex-flow-meters/268 "2025-05-13T00:21:55Z")
Advantages of Vortex meters 1 .Wide rangeability (for Reynolds numbers above l0,OOO). 2. An accuracy of 1 percent of rate. 3.A wide range of sizes. 4. Linear output. 5. Availability of pulse and analog outputs. Limitat… --- ## [Basics of Coriolis Flow measurement?](https://forumautomation.com/t/basics-of-coriolis-flow-measurement/1715)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [January 29, 2017, 5:27pm UTC](https://forumautomation.com/t/basics-of-coriolis-flow-measurement/1715 "2017-01-29T17:27:37Z")
Coriolis Flow Measurement Operating Principle - The operating principle of Coriolis flow mass flow meter is based on the force exerted by the Coriolis acceleration of a fluid. Construction of Coriolis Flow meter - Th… --- ## [What is zero stability on a Coriolis flow meter? How to do zero calibration check of Coriolis flow meters?](https://forumautomation.com/t/what-is-zero-stability-on-a-coriolis-flow-meter-how-to-do-zero-calibration-check-of-coriolis-flow-meters/11456)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 0\ **Last updated:** [September 6, 2023, 7:37am UTC](https://forumautomation.com/t/what-is-zero-stability-on-a-coriolis-flow-meter-how-to-do-zero-calibration-check-of-coriolis-flow-meters/11456 "2023-09-06T07:37:02Z")
What is zero stability on a Coriolis flow meter? The calibration accuracy of a Coriolis mass flow meter can be compared to the zero stability. The flow meter is filled with liquid and this normally automated process … --- ## [How to decide LRV and URV of Flow transmitter (differential pressure transmitter)](https://forumautomation.com/t/how-to-decide-lrv-and-urv-of-flow-transmitter-differential-pressure-transmitter/1208)
**Author:** [@automate](https://forumautomation.com/u/automate)\ **Replies:** 3\ **Last updated:** [August 8, 2016, 5:28am UTC](https://forumautomation.com/t/how-to-decide-lrv-and-urv-of-flow-transmitter-differential-pressure-transmitter/1208 "2016-08-08T05:28:36Z")
in specification of DPT LRL is 0 inH2O and URL is 500in H2O, how to decide lrv and urv , we use orifice for creating DP, maximum dp created when gas flow is about 200 inH2O but not fixed it may differ time to time, flow … --- ## [What do you mean by a flow meter and a flow transmitter?](https://forumautomation.com/t/what-do-you-mean-by-a-flow-meter-and-a-flow-transmitter/4538)
**Author:** [@rajeena](https://forumautomation.com/u/rajeena)\ **Replies:** 0\ **Last updated:** [September 3, 2018, 5:11pm UTC](https://forumautomation.com/t/what-do-you-mean-by-a-flow-meter-and-a-flow-transmitter/4538 "2018-09-03T17:11:47Z")
What do you mean by a flow meter and a flow transmitter? Most diverse substances like liquid, gases, steam are transported and distributed in piping systems in every single day. The fluid going through the pipes often ha… --- ## [Function of an orifice plate in flow measurement](https://forumautomation.com/t/function-of-an-orifice-plate-in-flow-measurement/70)
**Author:** [@instrumen](https://forumautomation.com/u/instrumen)\ **Replies:** 0\ **Last updated:** [October 2, 2014, 6:00pm UTC](https://forumautomation.com/t/function-of-an-orifice-plate-in-flow-measurement/70 "2014-10-02T18:00:29Z")
An orifice plate creates a differential pressure in a flow line. The DP created is use for measuring the flow through the process line ‘d’ (orifice diameter) id permitted in a pipeline 0.25 D\ **Author:** [@shah](https://forumautomation.com/u/shah)\ **Replies:** 5\ **Last updated:** [December 29, 2025, 9:20am UTC](https://forumautomation.com/t/electromagnetic-flow-transmitter-troubleshooting/1959 "2025-12-29T09:20:35Z") I have krohne IFC 050 magnetic flow convertor in service which measure flow of sodium sulphite. IFC 050 Convertor does not show flow measurement in his display when pipe have flow. No scaling problem. I clean electrode b… --- ## [Vortex flow meter](https://forumautomation.com/t/vortex-flow-meter/3041)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 1\ **Last updated:** [December 29, 2025, 9:04am UTC](https://forumautomation.com/t/vortex-flow-meter/3041 "2025-12-29T09:04:49Z")
Vortex flowmeters are used to measure pressure in the pipeline, creating vortices in the flow channel using a stationary object (Bluff body). The vortex flowmeters are used for measuring gases and liquids in pipeline … --- ## [Flow Measurement : Magnetic Flow meters -Application Advantages and Disadvantages Installation](https://forumautomation.com/t/flow-measurement-magnetic-flow-meters-application-advantages-and-disadvantages-installation/232)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 2\ **Last updated:** [May 12, 2025, 8:41am UTC](https://forumautomation.com/t/flow-measurement-magnetic-flow-meters-application-advantages-and-disadvantages-installation/232 "2025-05-12T08:41:05Z")
Application of Magnetic Flow Meters : Magnetic Flow meter measures the volumetric rate of flow any liquid that has adequate electrical conductivity. Most petroleum hydrocarbons have insufficient conductivity to be measur… --- ## [What are the types of ultrasonic flow meters ? How it works?](https://forumautomation.com/t/what-are-the-types-of-ultrasonic-flow-meters-how-it-works/1688)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 1\ **Last updated:** [May 17, 2025, 1:11pm UTC](https://forumautomation.com/t/what-are-the-types-of-ultrasonic-flow-meters-how-it-works/1688 "2025-05-17T13:11:02Z")
Type of Ultrasonic meter are 1.Ultrasonic transit time 2.Ultrasonic doppler 3.Ultrasonic open channel. How ultrasonic transit time flow meter works? Transit time flow meter utilize two transducers which function as bo… --- ## [What is transit-time flowmeter?](https://forumautomation.com/t/what-is-transit-time-flowmeter/7615)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [December 27, 2019, 6:10pm UTC](https://forumautomation.com/t/what-is-transit-time-flowmeter/7615 "2019-12-27T18:10:30Z")
Transit-time flow measurement technique uses ultrasonic pulse that is projected into and across the pipe. The transit-time meter’s basic premise is to calculate the time difference (or frequency shift) between downstrea… --- ## [Laminar flowmeter and it's advantages and disadvantages](https://forumautomation.com/t/laminar-flowmeter-and-its-advantages-and-disadvantages/2882)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [December 28, 2017, 2:56pm UTC](https://forumautomation.com/t/laminar-flowmeter-and-its-advantages-and-disadvantages/2882 "2017-12-28T14:56:39Z")
What is laminar flow? In fluid dynamics, laminar flow is flow regime characterized by high momentum diffusion, low momentum convection pressure and velocity independent from time. A flow can be said to be in laminar wh… --- ## [What are the advantages and disadvantages of ultrasonic flow meter gas flow measurement?](https://forumautomation.com/t/what-are-the-advantages-and-disadvantages-of-ultrasonic-flow-meter-gas-flow-measurement/1393)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 1\ **Last updated:** [December 29, 2025, 9:50am UTC](https://forumautomation.com/t/what-are-the-advantages-and-disadvantages-of-ultrasonic-flow-meter-gas-flow-measurement/1393 "2025-12-29T09:50:10Z")
Advantages of ultrasonic flow meter for Gas flow measurement 1.High Accuracy 2.Approved for custody transfer 3.High turndown/rangeability measure low and high pressure 4.Repeatable 5.Can clamp on pipe with no penetratio… --- ## [Orifice plate Taps](https://forumautomation.com/t/orifice-plate-taps/4982)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [October 22, 2018, 6:58pm UTC](https://forumautomation.com/t/orifice-plate-taps/4982 "2018-10-22T18:58:25Z")
Why Taps are required? The area of the fluid stream continues to contract after the stream has left the orifice and it has a minimum diameter at the vena contracts. The pressure of the fluid, therefore, continues to fall… --- ## [Multiphase Flow meter](https://forumautomation.com/t/multiphase-flow-meter/5141)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 3\ **Last updated:** [July 17, 2022, 6:52pm UTC](https://forumautomation.com/t/multiphase-flow-meter/5141 "2022-07-17T18:52:42Z")
Why use Multiphase Flow meter (MPFM)? Conventional measurement systems require that the constituents or “phases” of the well flows be completely separated upstream of the measurement point. Multiphase measurement techniq… --- ## [Vortex flowmeter](https://forumautomation.com/t/vortex-flowmeter/2876)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 1\ **Last updated:** [December 29, 2025, 9:03am UTC](https://forumautomation.com/t/vortex-flowmeter/2876 "2025-12-29T09:03:08Z")
When a fluid moves with high Reynolds number past a stationary object (a “bluff body”), there is a tendency for the fluid to form vortices on either side of the object. Each vortex will form, then detach from the object … --- ## [Calculate pressure drop across Orifice plate?](https://forumautomation.com/t/calculate-pressure-drop-across-orifice-plate/1322)
**Author:** [@automate](https://forumautomation.com/u/automate)\ **Replies:** 1\ **Last updated:** [September 4, 2016, 6:15am UTC](https://forumautomation.com/t/calculate-pressure-drop-across-orifice-plate/1322 "2016-09-04T06:15:13Z")
How to calculate pressure drop across orifice plate (liquid/steam application)? How to calculate LRV and URV? --- ## [What is flow rate ? What are the types of flow rate?](https://forumautomation.com/t/what-is-flow-rate-what-are-the-types-of-flow-rate/2190)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [August 13, 2017, 3:57am UTC](https://forumautomation.com/t/what-is-flow-rate-what-are-the-types-of-flow-rate/2190 "2017-08-13T03:57:58Z")
What is flow rate? Flow rate is an indication of how fast a substance move through a conduit from one place to another. Flow rate can also be used to determine the distance a substance moves over a period of time. Flo… --- ## [Ultrasonic flow measurement technique, Advantages and disadvantages of ultrasonic flowmeters](https://forumautomation.com/t/ultrasonic-flow-measurement-technique-advantages-and-disadvantages-of-ultrasonic-flowmeters/2665)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 1\ **Last updated:** [May 12, 2025, 8:43am UTC](https://forumautomation.com/t/ultrasonic-flow-measurement-technique-advantages-and-disadvantages-of-ultrasonic-flowmeters/2665 "2025-05-12T08:43:41Z")
Ultrasonic flowmeters pass high-frequency sound wave to fluid path to measure the fluid velocity. The ultrasonic method utilises the change in the propagation time in the flowing fluid. There are two major types of ultra… --- ## [What are Flow Switches? Types of flow switches](https://forumautomation.com/t/what-are-flow-switches-types-of-flow-switches/7629)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [December 30, 2019, 7:21pm UTC](https://forumautomation.com/t/what-are-flow-switches-types-of-flow-switches/7629 "2019-12-30T19:21:15Z")
What are the flow switches? Flow switches are devices that monitor the flow through a channel and send a “trip signal” to various devices in the system, such as pumps. The pump can be indicated by the flow switch to sh… --- ## [Flow meter sizing for orifice](https://forumautomation.com/t/flow-meter-sizing-for-orifice/3717)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [May 28, 2018, 3:32pm UTC](https://forumautomation.com/t/flow-meter-sizing-for-orifice/3717 "2018-05-28T15:32:49Z")
What is orifice? Orifice plate produce a constriction in the flow channel which results in a differential pressure across the constrian. The differential pressure is measured to measure the flowrate. Flow rate: The f… --- ## [How Coriolis mass flowmeter works?](https://forumautomation.com/t/how-coriolis-mass-flowmeter-works/2836)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [December 18, 2017, 2:48pm UTC](https://forumautomation.com/t/how-coriolis-mass-flowmeter-works/2836 "2017-12-18T14:48:33Z")
Why is it important to use mass flowmeters? Flow measurements are important in industrial automation, and there many flow meters available in the market. In food industries and health industries, it is important to m… --- ## [How Pitot tube is used in flow measurement?](https://forumautomation.com/t/how-pitot-tube-is-used-in-flow-measurement/2759)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [December 3, 2017, 9:26pm UTC](https://forumautomation.com/t/how-pitot-tube-is-used-in-flow-measurement/2759 "2017-12-03T21:26:18Z")
Pitot tubes also utilize the principles captured in Bernoulli’s equation, to measure flow. Most pitot tubes actually consist of two tubes. One, the lowpressure tube measures the static pressure in the pipe. The second, t… --- ## [The Vital Role of Grounding in Electromagnetic Flowmeters](https://forumautomation.com/t/the-vital-role-of-grounding-in-electromagnetic-flowmeters/11468)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [December 29, 2025, 9:32am UTC](https://forumautomation.com/t/the-vital-role-of-grounding-in-electromagnetic-flowmeters/11468 "2025-12-29T09:32:12Z")
Why is electromagnetic flowmeter grounding important? Grounding is a key aspect of electromagnetic flowmeters (EMFs) that is often forgotten but is essential to their accurate and reliable operation. EMFs are often u… --- ## [Types of Orifice fitting](https://forumautomation.com/t/types-of-orifice-fitting/6101)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [March 18, 2019, 3:56pm UTC](https://forumautomation.com/t/types-of-orifice-fitting/6101 "2019-03-18T15:56:49Z")
Orifice meter consists of measuring equipment and static pressure recorders and differential pressure connected to the flange orifice or orifice fitting. Orifice meter tube (meter run) consisting of upstream and downstre… --- ## [What are the different kind of flow switches and uses flow switch?](https://forumautomation.com/t/what-are-the-different-kind-of-flow-switches-and-uses-flow-switch/1139)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [July 3, 2016, 7:52pm UTC](https://forumautomation.com/t/what-are-the-different-kind-of-flow-switches-and-uses-flow-switch/1139 "2016-07-03T19:52:19Z")
Flow switch classification These switches can be classified as either air or liquid flow switches. They are used to monitor the flow of liquids,air or steam in various industrial applications where they send signals to… --- ## [What are the advantages and disadvantages of Variable Area Flowmeter?](https://forumautomation.com/t/what-are-the-advantages-and-disadvantages-of-variable-area-flowmeter/922)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [March 26, 2016, 11:55pm UTC](https://forumautomation.com/t/what-are-the-advantages-and-disadvantages-of-variable-area-flowmeter/922 "2016-03-26T23:55:06Z")
Variable Area Flowmeter Measuring Principle - The direction of flow in the vertical conic tube is from the bottom to the top.The upward flowing media lift the float for as long as necessary to reach an equilibrium.The … --- ## [What are Water trap and Pigtail siphons?](https://forumautomation.com/t/what-are-water-trap-and-pigtail-siphons/2889)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [December 29, 2017, 6:40pm UTC](https://forumautomation.com/t/what-are-water-trap-and-pigtail-siphons/2889 "2017-12-29T18:40:51Z")
Why trap and Siphons are needed? Many industrial processes utilize high-pressure steam for direct heating, performing mechanical work, combustion control, and as a chemical reactant. Measuring the pressure of steam is im… --- ## [Basics of Pitot tube](https://forumautomation.com/t/basics-of-pitot-tube/1778)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [February 20, 2017, 5:38pm UTC](https://forumautomation.com/t/basics-of-pitot-tube/1778 "2017-02-20T17:38:40Z")
Pitot Tube Pitot tube is an apparatus which uses Bernoulli’s theorem, for mathematical analysis to measure flow velocity of fluid. Bernoulli’s theorem states an increase in the speed of a fluid occurs simultaneously wi… --- ## [Zero check and static zero check on a DP flow transmitter](https://forumautomation.com/t/zero-check-and-static-zero-check-on-a-dp-flow-transmitter/77)
**Author:** [@instrumen](https://forumautomation.com/u/instrumen)\ **Replies:** 0\ **Last updated:** [October 2, 2014, 6:09pm UTC](https://forumautomation.com/t/zero-check-and-static-zero-check-on-a-dp-flow-transmitter/77 "2014-10-02T18:09:18Z")
Zero check- A procedure for checking the transmitter output is equal to 4.00 mA when its HP & LP chambers are equalized and are at the atmospheric pressure Static zero check- A procedure for checking the transmitter … --- ## [Flow measurement using Turbine flowmeter](https://forumautomation.com/t/flow-measurement-using-turbine-flowmeter/2886)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [December 29, 2017, 8:44am UTC](https://forumautomation.com/t/flow-measurement-using-turbine-flowmeter/2886 "2017-12-29T08:44:49Z")
A turbine flow meter is designed using rotor and blades to rotate the rotor in the flow stream using the mechanical energy of the fluid. The blades on the rotor are bent in order to convert energy from the flow into rota… --- ## [Flow measurement using Hot wire anemometers](https://forumautomation.com/t/flow-measurement-using-hot-wire-anemometers/2456)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [October 15, 2017, 8:43pm UTC](https://forumautomation.com/t/flow-measurement-using-hot-wire-anemometers/2456 "2017-10-15T20:43:18Z")
Hot-wire anemometer is most well known thermal anemometer, measure fluid velocity by noting the heat convected away by the fluid. Hot-anemometers are popular for unsteady flow of gas and liquid flow measurement. The basi… --- ## [How to measure flow rate of solid materials? - Gravimetric Feeder](https://forumautomation.com/t/how-to-measure-flow-rate-of-solid-materials-gravimetric-feeder/5819)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [January 29, 2019, 7:06pm UTC](https://forumautomation.com/t/how-to-measure-flow-rate-of-solid-materials-gravimetric-feeder/5819 "2019-01-29T19:06:52Z")
Determination of flow rate of solid materials is important to measure the flow rates of coal, cement, powdered chemicals, paper and fruits. Belt feeders are compact, factory-assembled devices that use belts to transport… --- ## [Different Annular Flowmeter types](https://forumautomation.com/t/different-annular-flowmeter-types/3408)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [April 12, 2018, 12:00pm UTC](https://forumautomation.com/t/different-annular-flowmeter-types/3408 "2018-04-12T12:00:00Z")
Annular flow meters are differential pressure flow meters, annular meters are introduced to overcome the defects the problems in orifice flowmeters. Such flow meters are listed below: Annular Orifice: Annular orifice… --- ## [What is dry leg and wet leg in differential pressure transmitter](https://forumautomation.com/t/what-is-dry-leg-and-wet-leg-in-differential-pressure-transmitter/9758)
**Author:** [@instrumentationtechi](https://forumautomation.com/u/instrumentationtechi)\ **Replies:** 1\ **Last updated:** [August 17, 2021, 10:27am UTC](https://forumautomation.com/t/what-is-dry-leg-and-wet-leg-in-differential-pressure-transmitter/9758 "2021-08-17T10:27:27Z")
What are the major applications of a differential pressure transmitter and how are they connected --- ## [Principle of Magnetic flow meter - Applications Advantages and Limitations](https://forumautomation.com/t/principle-of-magnetic-flow-meter-applications-advantages-and-limitations/426)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 1\ **Last updated:** [December 29, 2025, 9:25am UTC](https://forumautomation.com/t/principle-of-magnetic-flow-meter-applications-advantages-and-limitations/426 "2025-12-29T09:25:04Z")
Magnetic flow meter operation is based on Faraday’s law of electromagnetic induction. “The voltage (E) induced in a conductor of length (D) moving through a magnetic field (H) is proportional to the velocity (V) of the … --- ## [How to choose a right Flow meter?](https://forumautomation.com/t/how-to-choose-a-right-flow-meter/7029)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [August 24, 2019, 7:12pm UTC](https://forumautomation.com/t/how-to-choose-a-right-flow-meter/7029 "2019-08-24T19:12:14Z")
There are more than 20 types of different flow transmitters. Unless the process engineer knows the advantages and disadvantages of each type, selectingflowmeter correctly can be a challenge. Flowmeter size and vari… [Next page](https://forumautomation.com/c/field-instrumentation/flow-measurement/39.md?page=1&per_page=50)