Standard
temperature transmitters generally send a 4–20 ma. signal to indicate
the temperature. They are calibrated for a specific range of temperature
such as 0 to 100 degrees. Standard transmitters are designed to operate
with one type of sensor such as RTD, thermocouple, etc. Any changes to
the setting require a recalibration of the unit.
Cut-away view of a smart temperature transmitter.Honeywell
Smart
transmitters contain an internal microprocessor and can be calibrated
from the control room by sending a signal to the transmitter. It is also
possible to check the transmitter for problems from a remote location.
Smart temperature transmitter with meter.Honeywell
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