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Instruction Manual
760008-A
September 2001
Rosemount Analytical Inc. A Division of Emerson Process Management Operation 3-1
Model NGA 2000 TO2
SECTION 3
OPERATION
3-1 OVERVIEW
Once the TO2 has been correctly assembled
and installed in accordance with the instruc-
tions in Section 2, the analyzer is ready for
operation.
Before operating the system, verify that the
Leak Checks have been performed in accor-
dance with Section 2-5a.
For the remainder of this section, Analyzer
Module interconnection with a Platform or
some interfacing component is assumed. Dis-
play and Keypad information refers to that
which the user can expect to see and do with
regard to the Front Panel of the Platform.
3-2 DISPLAYS & OPERATING KEYS
The LCD screen shows all measurement val-
ues of the Analyzer, status values and all user
menu instructions. Operation is performed
with five function keys, four arrow (cursor)
keys and the enter key. The function of each
key varies depending on the installed Ana-
lyzer module, any auxiliary modules installed,
and the individual menu displayed.
In case of power failure, all user defined spe-
cific module parameters are saved by a bat-
tery powered memory.
The Function Keys, also called softkeys, are
assigned values depending on the menu or
screen being displayed. The legend is dis-
played above the keys.
The Enter Key is used to confirm a previously
entered variable value, to start a selected
function or to go to a submenu selected at a
menu line as opposed to the Function Keys.
As an alternate to using the Enter Key to start
a function, the → key can be used.
The Cursor Up/Down Keys (↑ or ↓) are used
to move up or down the lines within a menu or
to increment and decrement number vari-
ables.
The Cursor Left/Right Keys (← or →) are
used to move backwards or forwards between
the pages of a menu or to select numeric dig-
its for adjustment.
Figure 3-1. Platform Front Panel
F1 F2 F3 F4 F5
ROSEMOUNT ANALYTICAL NGA 2000
TO2
Dis
p
la
y
Status… Main… Channel BasicCal
0.00 Ran
g
e: 3 50.00
37.50
ppm
O
2
Electrolyte level: OK
Temp current: 263 uA 0.0 100.0
Range: 3
Sensor Current: 0.0500 uA 0.0000 100.0000
Enter Key
LCD Display
Function Keys
Cursor Keys