Teledyne LXT-280 - Manual (Page 21)

Dissolved Oxygen Transmitter Operation
Teledyne Analytical Instruments 11
Operation
This section will provide an overview of the front panel key
functions and the display menus for the LXT-280 Dissolved Oxygen
transmitters.
3.1 Using the Front Panel Keys
The operator keys on the explosion proof model are located behind
a sight glass window sealed from the environment. They are magnetic
and are operated by touching the glass in front of the appropriate key
using the supplied magnetic screwdriver. This allows instrument
operation without having to open the cover and expose the internal parts
to the environment. Figure 3-1 shows the layout of the LXT-280
faceplate.
Figure 3-1: LXT-280 Operator Interface
The operator keys are arranged in two groups:
1. VERTICAL UP/DOWN (▲/▼) Arrow Keys
These keys are used to change the display menu and to move the
cursor vertically. Any menu can be accessed by magnetically
activating the appropriate UP or DOWN key.