Emerson OCX 8800 instruction manual LOI Controls, Overview, LOI Key Functions

OCX 8800

Instruction Manual

IM-106-880, Rev 1.0 January 2007

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 utilizes HART communications, permitting access to all instrument functionality anywhere the 4-20 mA signal terminates via a HART model 275/375 handheld communicator.

Figure 4-2. LOI Assembly

Touch

Selection Confirmation

ArrowLED (Enter key)

E

Analytical

Display

Window

Selection

Arrows

Selection

Arrow

Lockout

Notation

LK

AL

Status

Code

37390042

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.

4-2