4.1 LOI Controls
4.1.1 Overview
The LOI, shown in Figure 4.1.2, utilizes 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.
It should be noted that the Hazardous Area OCX 8800 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.
4.1.2 LOI Assembly
Figure 4-3 LOI Assembly
Selection
Arrow
(Enter key)
Touch
Confirmation
LED
Selection
Arrow
E
Lockout
Notation
Display
Window
Analytical
Status
Code
4.1.3 LOI Key Functions
Selection
Arrows
The gray (top left) key will move one level higher in the menu structure. When entering parameter values
(numbers), this key moves the cursor to the left. The left-pointing key also doubles as an Enter key, used after the
digits of a parameter value are entered, and the cursor is moved to its left-most position. When the Enter key is
touched, the new parameter value, if accepted, will appear in the top line of the display.
The blue (bottom left) key acts as a selector when choosing from among several menu items. This right-pointing
key also will move the cursor to the right when entering the digits of a new parameter value.
The up and down-pointing keys are used to increment up and down when selecting from a vertical list of menu
items. These keys are also used for incrementing values up and down for new data input.
58 LOI Controls
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