4.2 Local operator interface (LOI) controls
4.2.1 Overview
The local operator interface (LOI), shown in Figure 4-2, uses a bright blue gas-
fluorescent display. Intensity is adjustable.
There is an infrared light-emitting diode (LED) source and a detector for each key.
The detectors can detect a finger placed above the button through the glass
window. There is no need to open the instrument in bad weather or in hazardous
areas in order to access the electronics.
The transmitter also uses HART
®
or FOUNDATION
™
Fieldbus communications,
permitting access to all instrument functionality anywhere the digital O
2
signal
terminates via a Field Communicator. The transmitter also uses HART
®
communications, permitting access to all instrument functionality anywhere the
4-20 mA signal terminates via a HART Field Communicator.
Using the local operator interface (LOI) Manual
December 2022 00809-0500-4880
70 Emerson.com/Rosemount
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