What is the deffernce bet. Instrumentation and Electrical
Enginerring?
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Answer Posted / sam
Instrumentation is all about measurement and control of
industrial processes like flow, pressure, level, density,
viscosity and so on. This is done with various sensors in
the plant that are calibrated by instrument technicians
according to the relevant process or application. The
readings of these sensors are then send to a central control
room via a world standard 4 to 20 mA signal and 24VDC, where
a monitoring supervisory system displays the information on
a computer screen. Control room operators interact with
these computer screens and stop and start pumps in the field
by clicking with the mouse on a small drawing on the screen
of the relevant pump. How this is done is with SCADA or DCS
software normally programmed by the instrument technician as
well. Instrumentation consists of only two sections, the
field side and the software side. Most instrumentation
technicians can do both.
Electrical work is done by a electrician and is all about
main power supply and distribution to the complete plant
either by using power from the main grit or local power
generators on the plant. Normally instrument technicians
will work on up to maximum 110VAC, a electrician can work
on any kind of power low or high. Only qualified high
voltage electricians are allowed to do high voltage
switching since this can be very dangerous to to.
Good luck
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Q1: Consider part of a control loop, which excludes the transmitter, consisting of a process, a controller and a control valve which may be represented by two dead times of 0.5 min each and three exponential lags of 0.8 min., 1.0 min. and 1.5 min. respectively. We wish to express this system as an overall first order plus dead time (FOPLD) model ie gain, time constant and process dead time. (We will see later that this is often done, to simplify controller tuning). For this exercise, gain is considered to be 1.0. (A) If the transmitter is a flow transmitter whose behaviour can be described by a dead time of 0.2 min. and an exponential lag of 0.5 min. in terms of the overall dead time and overall first order lag how can the system behaviour be approximated ? Overall dead time = Overall time constant = (B) If the transmitter is a temperature transmitter with a temperature sensor in a protecting well whose behaviour can be described by a dead time of 0.7 min. and an exponential lag of 15 min. how can the overall system behaviour be approximated now? Overall dead time = Overall time constant =
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