Accurate calibration and measurement
of strategic quantities such as flow, temperature, and pressure is an essential
part of the control or monitoring of operation of any process. A physical
quantity called the measured value and process variable is converted by a
measurement system in a measured value, usually an electrical or pneumatic
signal which can be used for display of control.
Now, from the chart of control
(automation) system we can see that the measurement device is most important
for the control or to run the all system smoothly, accurately & in some
hazardous chemical process most important to prevent an accident.
In any chemical plant for to neutralize the acid, pH
control system is run. Let us take an example of an Automation system, which is
run to stop the acidic chemical entering into the vessel in such type of
neutralization process. In the system the pH sensing probe sense the pH value
of the chemical and converts into corresponding mili volt and thus process value
is fed to the control device (pH controller). In the pH meter calibration controller reference
value of pH is feed. Now the neutralization process gives the corrected signal
to the process until the pH value of the chemical will be equal to reference
value after that it will feed to the vessel. In this process the sensor
(measuring device) is most imp portion because the final pH value of the
chemical depends on that. If the measuring device is not calibrated and it
gives incorrect signal to the system then there may be chances of entering
acidic chemical into the vessel and the vessel may blast. So to prevent an
accident monitoring of measuring devices (calibration) must be required.
In any chemical plant to neutralize the acid, pH control
system is run. In the calibration services of instruments the pH sensing probe sense the pH value of the
chemical and converts into corresponding mili volt and thus process value is
fed to the control device (pH controller). In the pH controller reference value
of pH is feed. Now the neutralization process gives the corrected signal to the
process until the pH value of the chemical will be equal to reference value
after that it will feed to the vessel. In this process the sensor (measuring
device) is most imp portion because the final pH value of the chemical depends
on that. So to have accurate measurement and to get desired value of substance
the measuring device must be accurate and to maintain its accuracy the
calibration is essential.
