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.
The sensors send the values of the refractive index nD 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.