is the process of checking the accuracy of a measuring instrument, this process
involves checking the accuracy of a measuring instrument and comparing it to
reference standards. Calibration is one of the primary processes which are used
to maintain accuracy of an instrument. Process of calibration is configuring an
instrument which provide a result with accuracy and within desired range. Calibration
is the key process which needs to be performed in an industry to get desired
accurate output for longer period.
the time there was a tendency that results and accuracy of an instrument tended
to drift from reference standards due to certain factors like temperature,
humidity, wear and tear of an instrument. Since these factors come into play
every time hence frequency of calibrating instruments should be set after
regular interval of time. Calibration improves and controls errors within
measured processes to an acceptable level. So if you know that a particular food
product needs to be kept above 500 C and instrument you are using
displays a figure of 50.80 C, then provided instrument is calibrated
to be accurate within 0.50 C at 500 C you can be confident
that the food is safe, if the system has an accuracy of 10 C though
then you cannot be certain the food’s temperature has been correctly
controlled. This example shows why it is necessary to have a calibrated level
calibration can be done on various products and equipment. Based on instrument
use the type of calibration can be defined,
1. Pressure calibration.
This is commonly used calibration
technique for measuring gas and hydraulic pressure. Various pressure balances
and calibrators are generally used, along with pressure gauges. Instruments that
can be tested for calibration are; Barometers, Analogue pressure gauges,
Digital pressure gauges and Digital indicators.
Electrical calibration mainly
measures voltage, current frequency, and resistance. It also monitors
resistance and thermocouple simulation covering process instrumentation. Instruments
that can be tested for calibration are Multi-meters, Counter timers, Insulation
tester, Loop testers and Clamp meters.
Mechanical calibration is used to
measure weight, torque, vibration elements. Examples of mechanical equipment
that can be tested for calibration include Weight and mass sets, Torque wrenches,
Scales, Balances, Vernier calliper, Load cells, Force Gauges etc.
Temperature and humidity
calibration usually takes place in a controlled environment. A number of
different types of instruments which are tested using temperature calibration
are Thermometers, Thermocouples, Thermistors, Infrared meters, Humidity
recorders, Psychrometers etc.
above listed calibration processes are the most commonly used processes. Further
calibration is used in many ways in many industries, other types of calibration
processes are; water flow calibration, oil flow calibration, air velocity
In manufacturing plants there is a lot of
money invested on a production process, if the instruments used in production are
not calibrated properly, then it will result in defective production process,
which can cost a lot of money. And in addition to that the process will then
need to be stopped, restarted which will consume more time. Hence in order to
save time and money both of any manufacturing plant, it is necessary to
calibrate all the instruments at regular interval of time to get good products
with lesser defects. In addition to this when we are measuring parameters such
as force or electric current, it is important that the quantities being
measured are accurate to maintain product safety. This could cause a safety
hazard such as fatal accidents if not properly calibrated which can result in
sum-up all, calibration is vitally important wherever measurements are
important, it enables users and businesses to have confidence in results they
record and subsequently monitor.