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Instruction Manual
IM-106-880C, OI
September 2009
Hazardous Area OCX 8800
4-2
LOI CONTROLS
Overview The LOI, shown in Figure 4-2, 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
F
OUNDATION Fieldbus communications, permitting access to all instrument
functionality anywhere the digital O
2
signal terminates via a model 375 Field
communicator.
Figure 4-2. LOI Assembly
LOI Key Functions 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.
E
37390042
Display
Window
Selection
Arrows
Selection
Arrow
Selection
Arrow
(Enter key)
Touch
Confirmation
LED
Analytical
LK
AL
Lockout
Notation
Status
Code