Measuring instruments
In physics, chemistry and engineering, a measuring instrument is a device used for:
"to compare physical magnitudes by means of a measurement process. As units of measurement are used objects and events previously established as standards or patterns and the measurement is a number that is the relationship between the object of study and the Unit of reference. Measuring instruments are the means by which this conversion is made. "
There are two classifications of the measuring instruments: according to the function of the instrument and according to the process variable.
According to the function of the instrument:
Blind instruments:
Have No visible indication of the variable, are all those that are generally of manipulation such as switches, thermostats, valves, transmitters, etc. that only fulfill their work without the need to express the Gradual signal changes.
Indicator instruments:
They have an index and a graduated scale in which the value of the variable can be read. They have a scale to express the equivalence of the data to the operator, they can be manometers, tensiometers, among others. They can be concentric, eccentric and digital.
Recording instruments:
They record with continuous stroke or with points the variable and can be circular or of rectangular or elongated graph. Are those that show the behavior of the variable over time.
Depending on the variable: (This measurement corresponds to the type of measure signal)
I) to measure length:
Flexometro
caliber
micrometer
Clock
Interferometer
II) to measure Mass:
Scale
Scale
Spectrometer
Catarómetro
III) to measure time:
Calendar
chronometer
Watch
Atomic clock
radiometric dating
IV) to measure angles:
goniometer
sextant
Conveyor
V) to measure temperature:
Thermometer
thermocouple
pyrometer
VI) to measure pressure:
Barometer
manometer
pitot tube
Anemometer
VII) to measure Flow:
flowmeter
VIII) to measure electrical properties:
electrometer
ammeter
galvanometer
ohmmeter
voltmeter
Wattmetro
Multimeter
Bridge Wheatstone
Oscilloscope
IX) Optical Instruments
X) to measure unclassified magnitudes:
colorimeter
Spectroscopy
Counter Geiger
radiometer
seismograph
phmetry
Pirheliómetro
Meters height
Ind. de cover
Check tyres
Torquimetro,
Dilatometer
