Don't know when I'll ever need a flow measuring system, but when that time comes, pretty sure E+H will come to mind. Also thanks for making these well explained videos; they sparked something in me with a desire to study physics.

great animation ....concept clear in just 4 min..great great video ...keep it up.. you had done tremendous job.

this look so great for all physical student and so weird for otherwise people

Awesome animation, thanks!

Awesome. Keep rocking.

How exciting ❤

11years since it was uploaded NICE !

VERY NICELY EXPLAINED ....THANKS A LOT...........

Very good explanation with the animation. It is useful for the principal understanding.... Thank You

Transcript of the video: Inside thermal flowmeters there are two temperature sensors protruding into the measuring tube. They are known at Pt100 resistance thermometers. One of these temperature sensors measures the actual gas temperature as a reference regardless of the flow velocity. The second temperature sensor is heated constantly via electrical energy, so that a predefine temperature difference is maintained between the two sensors-for example 10 degrees. If there is no flow, the differential temperature between the two sensors does not change. As soon as the fluid begins to flow in the measuring tube, heat is drawn from the heated temperature sensor by the gas flowing pass. The heat then is carried off by the flow. The corresponding colling effect is measured and compensated immediately by adding more heating current. As a result the temperature difference is continuously maintained. The heating current required to maintain the temperature difference is proportional to the cooling effect and therefore is a direct measure for the mass flow in the pipe. The greater the flow velocity-and therefore the additional cooling of the heater sensor-the greater the heating current required. An alternative adaption of the principle keeps the heater current at a constant value and then measures the change in temperature differential. But how is the heat actually transferred from the heated temperature sensor to the gas flowing past? This sequence shows that the heat is transferred by the gas molecules themselves. When the gas flows past, the molecules absorb tiny heat packet and carry them along with the flow. The faster the gas flows, the more often they absorb the heat. The heat transfer also depends on the density of the gas because at a higher pressure- or a lower temperature - there are more gas molecules in the pipeline. The greater number of molecules results in more contact with the heated sensor, meaning increased cooling and thus increased heating current flow. And finally, the heat transfer is also affected by the thermal properties of the gas. For example at the same mass flow, the high thermal conductivity of hydrogen-shown here in green-causes cooling that is 100 times greater than with air. For a precise measurement, it’s therefore important that the specif properties of the gas are known and are consistence. Flow measurements using the thermal principle is also possible in large pipe and ducts. There are meter types, designed specially for this application. They can be inserted directly into the pipe via a standard process connection. It is important that the required insertion depth be respected so that the measurements is carried out at the correct point. For that reason it is essential to program the actual internal pipe diameter for all insertion meter. Correct insertion also applies for rectangular and square ducting often found in factory or building air circulation system.

Great animation and easy-to-grasp explanation, but ''tiny heat packets'' should be banned vocabulary :-)

Amazing tutorial using aNimation. Perfect..

very good video.

Great animation I really loved it... Can you please tell me how you can differentiate the cooling effect caused in the Pt 100, weather it is caused by change in density of the fluid or is it caused because of change in flow rate of the fluid.....

Project Name：Power Protection Application - Generator + UPS + ATS

Mix the temperatures to get reads, heat cold flow. Water temperature and flow from pump will blend in.

Great video. To Calibrate a T-mass 65 to read CO2, should I input manually the operating pressure of 11.5 bar, the density of CO2 at 1 bar, 0°C to proper calculate the mass flow? Is it all or there are other parameters to set. Since the Meter comes from factory with settings for air. Thanks in advance.

Hi E+H team, is it possible to measure chlorine & hydrogen gas using this type of thermal mass flowmeter?? What it's advantage over DP type flowmeter (which we are using in our plant) ??

Dear Sir, I am Sunku Prasad, a PhD student from IIT Guwahati, India, working in the area of high temperature thermal energy storage system. I want to know whether it is possible to design a thermal mass flow meter for measuring mass flow rate of molten salt. the molten salt is flowing in the pipe at a temperature of 400°C. The flow rate range is 2.5 lpm to 10 lpm. Kindly let me know the possibility of such device. Please share your contact to discuus further on this application. Thanking you Sincerely Sunku prasad

is Dt constant in measuring process? i mean dt shall be fixed in process with increasing or decreasing thermal current.

Hello, Sir. I'm a teacher, and I find your videos incredibly beneficial for both my students and myself. I would appreciate it if you could provide clarification on whether the video producer permits its use for classroom teaching purposes. Additionally, are there any potential copyright issues that we should be aware of?

How to make model of hot wire anemometer

Nice video. But I still didn't get how is temperature used to measure the flow. Like high and low? Not specific flow rate?

hi guys

فد شي ذكي وعبقري بس مالة داعي هواي اكو تطبيقات لل folw هذا استعراض افكار هههههههه

Great Animation really loved it. Can you please tell me how this can be used in measurement of natural gas? Will it affect the natural gas due to the heat transferred ?