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WHAT IS THE DIFFERENCE BETWEEN A TRANSMITTER & A SMART
TRANSMITTER.
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Answer Posted / sam
We went through various eras or technology time periods in
instrumentation. Believe it or not but measurements of flow
and level had been done by the old Egyptians that build the
pyramids already. They had use for instants a stick with
marks on it to see what the level was in one of their tanks
and various other simple measuring and control devices as well.
We normally are not to concerned with the type of
instrumentation that was used that long ago. We normally say
that instrumentation only started to take off during the
pneumatic era where all measurement and controls were done
by pneumatic and some electrical instrumentation. The world
standard instrumentation signal was also a pneumatic one
then. It was 20 to 100Kpa or 3 to 15Psi. What this means is
that we had to calibrate our pneumatic pressure transmitters
and controllers to give this output of 20 to 100Kpa. You
really had to know instrumentation when you worked with
these pneumatic stuff. We even had pneumatic relays and
pneumatic chart recorders back then.
Later we moved on to electromechanical instruments and some
very simple electronic indicators and chart recorder.
After the transistor and micro processors were developed
things started to move along very fast and we started to see
various electronic instrumentation and transmitters on the
market. I call this the 4-20mA era. These very advanced type
of transmitters had to be pumped up with a small hand pump
as normal, but all you then had to do was make small
adjustments with a small screwdriver to a zero and span pot
to calibrate the transmitter. Very advanced to what we were
use to. These were called the electronic 4 to 20 mA
TRANSMITTERS.
The new electronic world standard signal then started as the
4 to 20 mA signal, but keep in mind that the pneumatic world
standard signal, even today, is still the 20 to 100Kpa signal.
Since then we have moved on to the smart instrumentation era
where we calibrate the transmitters with a HART communicator
and the transmitter itself is actually a small computer that
can even detect a error on itself or tell you if the
calibration you are trying to do is invalid. From there the
technology of SMART TRANSMITTERS. You even get SMART valve
positioners that can accurately detect the erosion of it's
control valve's plug and seat and send a alarm signal to the
CCR that a overhaul on the valve is needed. All just
computer software and programming like anything else in
today's world. Look what you can do with a cellphone today.
Very smart little gadget.
Not to worry they will never be as smart as a instrument tech.
Good luck
| Is This Answer Correct ? | 38 Yes | 12 No |
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