User guide

I-E67-84-1B February,2002 2-2
USER INTERFACE
The user interface consists of a tactile
keypad having four Smart keys, one hidden key,
and a custom LCD. The LCD has a three and
one-half digit numeric region that displays
the process variable, a six-digit alphanumeric
region that displays secondary information and
programming prompts, and several status-
indicating and programming icons.
Using a novel approach (patent-pending), each
of the four keys is located under a given set
of icons. In each of the instrument modes and
mode states, one icon over any given key will
be illuminated and will represent that key’s
function. These Smart Key assignments will
vary as the user enters into different
programming modes and states. In addition to
the Smart Key assignments, text strings
located in the six character alphanumeric
field (i.e., secondary display) are used as
programming prompts. The end result is an
interface that provides a great deal of
flexibility and functionality.
MODULAR ELECTRONIC ASSEMBLIES
The TB84PH Advantage Series analyzer consists
of three separate PCB assemblies that
concentrate specific circuit functionality
onto each of the three boards. This modular
design allows for the ability to change the
instrument from one of four types of
instruments: pH/ORP/pION, four-electrode
conductivity, two-electrode conductivity, and
toroidal conductivity. In addition, analyzer
repairs can be quickly accomplished by simply
replacing the non-functioning board with an
operational one.