4. Indicating transmitter DTR
The indicating transmitter DTR is a specialized computer designed to process data received
from one or two sensors. The indicating transmitter enclosure contains a front panel with a
backlit LCD and a keyboard. The front panel swings open to give access for connections and
service. Both of the enclosure’s cover latches include knockout padlock provisions to
prevent unauthorized access.
PROCESS INSTRUMENTS
P O W E R
Figure 3 Indicating transmitter enclosure
The sensors send the values of the refractive index n
D
and the process temperature T to the
DTR. The microprocessor system then linearizes the concentration reading as shown in the
following example, and performs an automatic temperature compensation.
Chapter 4 – Indicating transmitter DTR
21
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