Instrumentation and control engineering deals with the measurement and control systems which are crucial and very complicated in process control strategies.
Complicated means it is usual to get mistaken by instrumentation or control engineers. Here is a list of mistake that are usually made:
Selecting the wrong sensor:
Selecting the wrong sensor can be technically choosing the sensor wrongly or financially.
What type of flow meter, temperature sensor or pressure gauge is best suited for the job is not always obvious. A mismatch between the sensing technology and the sensing material will result in distorted measurements and severe power.
Instrumentation vendors may help avoid errors in the software. The best vendors train their sales people to support the selection of sensors and provide easy-to-use choice guides for customers.
Also in case of cost of sensor used, one should choose the sensor wisely according to the range of their process or industry. There are multiple ranges of sensors available in the market at a large price range, a higher price means extreme quality, brand and additional accessibility etc.,
For the simple purpose, we can choose sensors from lower price range.
Incorrect installing of sensor:
Sensing devices should be mounted correctly in a position to get exact parameters.
Poor control also results when a sensor is too far from the associated actuator being installed. A remote sensor may not be able to measure the effects of the last movement of the actuator in time for the operator to make an informed decision on what to do next.
Ground loops are not the only noise source capable of distorting the readings of a sensor. Among plants that use walkie talkies, pagers, and wireless networks, radio frequency interference (RFI) is even more common.
Where appropriate, the sources of RFI noise must be isolated or at least kept away from the instrumentation of the facility. Replacing electromechanical equipment with solid-state equipment removes arc-generated RFI.
Even after the installation and completion of sensor mounting, the risk of error is not over. The sensor should be calibrated properly. The output of a sensor continues to crawl higher and higher (or lower and lower), even if the parameter measured has not changed.
Many manufacturers understand the time and effort involved in conventional recalibration procedures and design tools to simplify matters.