Available online
Description
This programme shows how a variety of transducers can be used to measure fluid flow using two different principles.
This programme shows how a variety of transducers can be used to measure fluid flow using two different principles.
| Module code and title: | T291, Instrumentation |
|---|---|
| Item code: | T291; 07 |
| First transmission date: | 17-06-1974 |
| Published: | 1974 |
| Rights Statement: | |
| Restrictions on use: | |
| Duration: | 00:22:59 |
| + Show more... | |
| Producer: | Tony Jolly |
| Contributors: | Gary Alexander; Gaby Smol |
| Publisher: | BBC Open University |
| Keyword(s): | Anemometer; Bridge circuit; Flow rate; Swirl meter; Thermal flow meter; Vortices |
| Footage description: | Gaby Smol with a commercial household type gas lighter. He introduces the programme which will examine two types of flow transducers. Smol explains how a gas lighter can be used as one element of a flow transducer. Smol turns to a bridge circuit which has a gaslighter element wired into it. Smol explains how flow is measured with this apparatus. He demonstrates method for balancing the bridge and then explains how it can then be done automatically with an anemometer circuit. Shot of anemometer circuit. Gary Alexander with a commercial hot wire anemometer. He points out its various components and explains how it works. Shots of the anemometer probe. Alexander blows on the probe. A digital readout of the flow rate across the hot wire probe is shown. Alexander blows on the probe again. This time the flow rate is displayed on an oscilloscope screen. Alexander demonstrates calibration procedure for the anemometer. He explains as he calibrates, then plots his readings on a graph. Shot of the sensing element of a mass flow transducer. Smol points out its component parts. Smol with a mass flow transducer. He takes off its cover and explains how it works. Smol demonstrates by blowing into a tube which, is coupled with the transducer. Digital readings are obtained. Smol explains why this type of transducer is slower than the anemometer. Smol uses a circuit diagram of a mass flow transducer to explain in detail how it works. Smol demonstrates the transducer using a "Mass Plowmeter Demonstrator". Shots of a mass flow transducer at the Nypro (U.K.) Ltd. chemical plant. Gary Alexander generates turbulence patterns by moving air around an obstruction in a tube. (The pattern is shown by a piece of cloth flapping in the air flow). He explains how this principle can be used to measure flow rate. Shots of Turbulence pattern of liquid flowing past an obstruction. Dye has been added so that the eddy patterns can be seen. Commentary by Gaby Smol explains how rate of flow can be measured by counting the number of vortices created by the eddy currents. Shots of an industrial flow meter which works on this vortex counting principle. Gary Alexander explains how it works. He uses a diagram of a flow meter to aid. Alexander continues his explanation with the aid of a disassembled industrial flowmeter. Shots of the output readings from an industrial flow meter. Gaby Srnol demonstrates the effect of a swirler blade on flow. He demonstrates the effect for various rates of flow of air. Diagram shows the operation of a flow meter using swirls (a Swirl meter). Gary Alexander explains how it works. Gary Alexander with an actual swirl meter. He points out its component parts. |
| Master spool number: | 6HT/71231 |
| Production number: | 00525_5123 |
| Videofinder number: | 1068 |
| Available to public: | no |
