Aneroid gauge ppt giving basic idea abt gauge and its working

1.  Aneroid Barometer
 Aneroid Sphygmomanometer
 Aneroid Manometer

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

4. Aneroidbarometer
 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. Working
Aneroid Barometer

9. Workingof aneroidbarometer
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
T H E S P H Y G M O M A N O M E T E R W A S I N V E N T E D B Y
S A M U E L S I E G F R I E D K A R L R I T T E R V O N B A S C H
I N 1 8 8 1 .
S C I P I O N E R I V A - R O C C I I N T R O D U C E D A M O R E E A S I L Y U S E D V E R S I O N I N 1 8 9 6 .

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