Aneroid gauge

Aneroid gauge ppt giving basic idea abt gauge and its working

1. Aneroid Barometer Aneroid Sphygmomanometer Aneroid Manometer Aneroid Gauge

2. Definition Aneroid" means "without fluid", and the term originally distinguished these gauges from the hydrostatic gauges. However, aneroid gauges can be used to measure the pressure of a liquid as well as a gas, and they are not the only type of gauge that can operate without fluid.

3. Barometers are instruments used to measure the pressure of the atmosphere. A barometer is used by meteorologists to forecast short-term changes in the weather. If the atmospheric pressure falls, storms and rain can be expected. There are two types of barometers that work differently to measure the atmospheric pressure. Barometer are two type… 1. Mercury Berometer 2. Aneroid Berometer Barometer

4. Aneroid barometer An aneroid barometer is a barometer in which variations in pressure are measured using a partially evacuated. It consists of a small, flexible metal box called an aneroid capsule, which is made from an alloy of beryllium and copper. The metal box is tightly sealed so that changes in atmospheric pressure outside the box cause an expansion and contraction of levers and springs inside the box.

5. History Lucien Vidie was a Frenchman who made the first satisfactory metallic barometer in 1843, and obtained his first patents in 1844. The face is marked “BARÓMETRO ANEROIDE” as well as “TEMPESTAD,” “LLÚVIA Ó VIENTO,” “VARIABLE,” “BUEN TIEMP,” and “CONSTANTE. The scale extends from 17.5 to 31.5 inches of mercury, and from 68 to 80 cm of mercury Invented Date is 1845-1923.

6. Aneroid Berometer Aneroid barometer is a solid device, which is easy to transport and take readings . The aneroid barometer requires machinery. The aneroid barometer is a compact and stable device . Mercury Berometer whereas, the mercury barometer is very hard to transport. The mercury barometer can be constructed easily The mercury barometer is a very large and fragile apparatus

7. Manufacturing The case The aneroid capsule The linkages The temperature compensator Final assembly

8. W ork ing Aneroid Barometer

9. Working of aneroid barometer  Instead of having a pool of mercury that the atmosphere pushes down on, they have a sealed, air-tight metal box inside. As the air pressure rises or falls, the box either squashes inward a tiny bit or flexes outward. A  spring  is cunningly attached to the box and, as the box moves in and out in response to the changes in air pressure, the spring expands or contracts and moves the pointer on the dial. The dial is calibrated (marked with numbers) so you can read the air pressure instantly.

10. How to know the weather using aneroid barometer? Aneroid barometers measure the air pressure when you knock their glass faces. When you first inspect them, the needle shows the pressure as it was when you last looked at them—however long ago that might have been. Give the glass a sharp tap and the needle will jump to a new position showing the pressure as it is now. The way the needle moves is important. If it moves clockwise, up the dial, the pressure is increasing so the weather is likely to be getting hotter, drier, and finer; if the needle turns counter clockwise, the pressure is decreasing and the weather is likely to get cooler, wetter, and poorer.

11. ADVANTAGES OF ANEROID BAROMETER An aneroid barometer is the quick and easy handling of the instrument It can be carried from one place to another without any apprehension of damage to the instrument whereas this is not possible in the case of mercury barometer Further it can be fitted to an aircraft to sustain variations and rolls of the aircraft whereas a mercury barometer cannot be fitted like this Aneroid Barometer doesn’t need a mercury column, so it is compact. It is easier to handle. It’s easier to read, as the measurements are calibrate minutely.

12. Disadvantage OF ANEROID BAROMETER An aneroid barometer is found to be less accurate when compared with a mercury barometer

13. Aneroid Sphygmomanometer A sphygmomanometer consists of an inflatable cuff, a measuring unit (the mercury manometer, or aneroid gauge), and a mechanism for inflation which may be a manually operated bulb and valve or a pump operated electrically.

14. History of Aneroid Sphygmomanometer THE SPHYGMOMANOMETER WAS INVENTED BY SAMUEL SIEGFRIED KARL RITTER VON BASCH IN 1881 . SCIPIONE RIVA-ROCCI INTRODUCED A MORE EASILY USED VERSION IN 1896 .

15. DIFFRENCES BETWEEN ANEROID AND MERCURY SPHYGMOMANOMETER 1) Mobility The aneroid sphygmomanometer consists of a spring device and metal membrane that translates the signals from the cuff and operates a needle in the gauge. This requires no liquid. The absence of a liquid provides mobility, as this device can be moved easily from one location to another. In addition, it can be placed on walls. The mercury sphygmomanometer must be kept in a level location so the mercury will remain in place. Transporting it risks affecting its accuracy.

16. (2) Accuracy/Calibration According to an article in the Journal of Public Health Policy that studied the accuracy of mercury and aneroid sphygmomanometers over the period of 1995 to 2009, mercury provided more accurate results. A factor in accuracy involves calibration. Like most devices, failure to calibrate on a regular basis results in inaccurate readings. Aneroid devices must be calibrated more frequently due to the fact they are more complex than mercury devices. Inaccurate results occur any time the needle does not rest on zero before use, necessitating a calibration.

17. (3) Problems Mercury is a hazardous material and pollutant. Its use in a medical setting presents problems including potential breakage, leakage and disposal. This difference between mercury and aneroid leads the effort to eliminate the use of mercury in hospitals. Besides safety, the most important consideration in blood pressure measurement is accuracy. According to the UCLA Department of Medicine, inaccurate blood pressure measurements lead to faulty diagnosis and treatment. Aneroid sphygmomanometers can provide accurate measurements as long as they are properly and frequently calibrated.

18. Aneroid manometer An aneroid manometer is a device used by medical professionals to measure blood pressure, which is the force exerted on the walls of the arteries as the heart pumps blood around the body. The aneroid manometer is one of three main types of sphygmomanometer; both aneroid manometers and mercury manometers must be read manually and are used pretty much the same way, while the third, a digital sphygmomanometer, is automatic. Digital manometers are easier to use, but mercury and aneroid manometers are more accurate, though aneroid manometers need to be calibrated more often. Blood pressure is recorded in millimetres of mercury (or mmHg) and varies depending on the patient's age, activity, posture, medication or any pre-existing diseases.

19. IMPORTANCE IN MODERN WORLD Weather forecasting Storm Chasers Pressure Maps Flying aircraft

20. references 1)Wikipedia 2)www.explainthatstuff.com 3)www.practicalclinicalskills.com 4)www.sciencing.com