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Temperature sensor
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Figure 813 Principle of operation of chilled-mirror dew-point temperature sensor
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Design Procedures: Part 6 234 Eight
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Figure 814 Diaphragm pressure sensor
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Pressure sensors For sensing differential pressure, some type of diaphragm is used (Fig 814) The diaphragm separates the two halves of a closed chamber, with one of the two pressures introduced on each half, or one-half may be open to atmosphere as a reference Diaphragm materials may be a exible elastomer or thin metal, depending on the use and pressure range Sensors are available for pressures ranging from a few inches of water to several thousand pounds per square inch gauge The exing of the diaphragm as the pressures change is ampli ed in various ways to provide a modulating signal, which can be used for modulating or two-position control One special diaphragm application, called a piezometer, utilizes a crystalline structure in which the electric current ow varies as the crystal is deformed A bellows (Fig 815) is a corrugated cylinder which expands or contracts linearly as the pressure changes The input pressure is always compared to atmospheric pressure A bourdon tube (Fig 816) is a closed semicircular tube, which tries to straighten as the pressure is increased This is the sensing element in most dial pressure gauges, but it is seldom used in control devices
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Figure 815 Bellows pressure sensor
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Design Procedures: Part 6 Design Procedures: Part 6 235
Figure 816 Bourdon tube pressure sensor
Note that the air velocity measured with a hot-wire anemometer (Sec 8314) can be used to measure an air pressure difference between two adjacent spaces, with pressure being indicated as a function of the air ow velocity
8314 Flow sensors In HVAC work, it is often necessary or desirable to measure or detect the ow of air, water, steam, or other gases Several methods are available A sail switch is a two-position device for detecting air ow or no ow It consists of a lightweight sail mounted in the duct and connected to close a switch when the sail is displaced by air movement A similar device, called a paddle switch, is used in piping to detect liquid ow These devices have a tendency to stick in the open or closed position or to oscillate between open and closed, providing a false signal Some engineers believe that a more reliable ow/no- ow indication can be obtained by reading the pressure differential across the fan or pump
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Design Procedures: Part 6 236 Eight
Sensing current at the motor is another way of reporting ow, but the current sensor may not be sensitive enough to detect a broken belt or broken coupling The hot-wire anemometer air ow sensor (Fig 817) includes a small electric resistance heater and a temperature sensor The air owing over the heater has a cooling effect, and the air velocity is proportional to the amount of electric energy required to maintain a reference temperature A variation of the concept imposes a xed voltage across the resistance, with circuitry to read the current ow which changes with sensed temperature and with ow Hot-wire anemometers require a reference to neutralize the effect of changing temperature on the output signal The pitot tube (Fig 818) is a double tube, installed in a duct or pipe so that the tip points directly into the uid ow and therefore measures the total pressure (TP) Openings in the outer tube face at right angles to the ow and measure static pressure (SP) only When these two pressures are conveyed to a differential pressure sensor or a manometer, the difference between them can be read and is equal to velocity pressure (VP) from the equation VP TP SP (83)
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