Emerson Rosemount OCX 8800 - LOI controls

4.2 LOI controls
4.2.1 Overview
The LOI, shown in Figure 4-2, uses a bright blue gas-fluorescent display. Intensity is
adjustable. There is an infrared 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 Model
375 Field Communicator.
Using the LOI
58 OCX 8800