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In the latter half of the 19th century, newly developed refrigeration and cryogenic processes allowed products to be cooled to levels far below traditional winter experiences regardless of the location or season.
Control-room instrumentation has come a long way from the days of drag pens on paper chart recorders and manually tuning temperature loops with trim pots. Most of these instruments were large and heavy steel-cased units that performed adequately for that time. Actually, some of these instruments may still be in use in some facilities if they have been well taken care of.
There are several
methods of talking to instrumentation, but which one is best for my
application? I hope this article makes this much clearer and gives you a good
indication as to which way to proceed.
You may be one of the operators now responsible for keeping the process running as well as taking care of the instrumentation. The ability to manually tune a process loop is an art that is quickly becoming scarce.
Most digital recorders on the market today are not just digital versions of paper recorders, but are now more aptly considered networked recording stations. As this suggests, it allows information from monitored equipment in the field to be connected to a network where a plant manager has many options in managing his or her data. This technology had faced resistance initially but is being much more widely accepted. However, there are still many holdouts.
