MIEE2210N-ENGINEERING
INSTRUMENTATION&INDUST
RIAL CONTROL
Assessment Method :
Theory Practical
Quizzes 15%
Home Works 10% Lab Work 80%
Class participation 5%
Mid Term Exam 20%
Final Exam 50% Practical Quiz 20%
Total 100%
Theory Weightage = Practical Weightage =
Total Theory X 0.67 Total Practical X 0.33
SCL Plan
One among two assignments, as a group work with a self-learning
topic. Assessment can be through group presentation / VIVA /
evaluative discussions.
Peer Tutoring
Class participation assessment based on the student's participation in
the classroom discussions
Group discussion/tutoring sessions
SCL Resources: 1.
http://www.controleng.com/control-systems/pid-adv-control.htm
Student Centered learning
Measurement system
Measurement: is the
process of determining
the value of a physical
quantity
Example
Measurement Systems:
is the means to
determine a
measurement.
Elements of Generalized Measurement
System
Three basic parts :
Transducers /Sensors
Signal processor
Data representation Elements
Transducer/sensor: senses the input and converts physical
input variable into a proportional output.
Signal processor : changes the sensor output into a
suitable form for display or onward transmission to
control system.
Example functions:
Performs amplification,
filtering
Analogue to digital converter,
averaging,
nonlinear compensation
Examples:
The recorder (Data representation):
Presents the measured value in a visual way.
Four ways of presenting the data:
Analog meter
Computer monitor
Printed form
Store in flash drive, cd drive,harddisc
Example 1
Temperature measurement using
thermocouple
Example 2
Temperature measurement using
RTD
Loading effect
Loading Effect: The act of attempting to make the
measurement modify the variable is called Loading.
Examples :
1.Measurement using cold thermometer for a hot liquid(the reading is not correct due to loading )
2.Loading with an 3.Loading with a
ammeter voltmeter
Performance parameters of measuring system
Accuracy
Range
Dead space
Sensitivity
Resolution
Error
I. Accuracy :closeness of measurement compared
to the true value.
Percentage of full range of output or full scale
deflection.(F.S.D)
Example problems
1.An ammeter has a F.S.D of (0-5A)and an accuracy of 5 %.what is
the accuracy can be quoted for the current reading of 2 A?
2.An ammeter has a F.S.D of (0-5A)and an accuracy of 1 %.what is
the accuracy can be quoted for the current reading of 3 A?
3.An voltmeter is quoted as having the range of 0-10V and an accuracy
of 5% of F.S.D.what is the accuracy which can be quoted for a
voltage reading of 6V?
II .Range
Dead space /Dead band
III . Sensitivity
Example :thermocouple has a sensitivity of 20v/ oC
IV. Resolution Minimum change in input
required to detect the change
in output
Error
ERROR = Measured value True Value
Error
Random error Systematic error
Operating error Construction
errors
Environmental error
Approximati
on error
Stochastic error
Ageing error
Insertion
error
Example problems
1. Example: A pressure measurement system is stated as having the
following characteristics. Explain the significance of the terms:
Range: 0 to 125 KPa and 0 to 2500 kPa. Accuracy: 1% of the displayed
reading. Temperature Sensitivity: 0.1 % of the reading per C.
2.A Hydrometer is specified as having a range of 600-650 Kg/m3 and an
accuracy of 0.5Kg/m3. Explain the significance of this data.
3.A thermocouple is specified as having the sensitivity of 0.03millivolt / C.
What does this mean?
4.A force-measuring system has a range of 0-200N with resolution of 0.1% f.
s. d. What is the smallest change in the force that can be measured?
