Emerson NGA 2000 TO2 - Manual (Page 31)

Instruction Manual
760008-A
September 2001
Rosemount Analytical Inc. A Division of Emerson Process Management Operation 3-7
Model NGA 2000 TO2
a. Quick Start
This analyzer module is equipped with a
quick start feature which allows the sen-
sor to begin measuring low ppm oxygen
faster. This feature can be used when the
analyzer is first turned on to decrease the
time required for the sensor to reach
equilibrium. This function is most effective
for gas sample measurements below 100
ppm. To maintain sensor life, it is recom-
mended that this feature be used no more
than two times in any 24 hour period.
A normal start can take from 2 to 72 hours
depending on the concentration being
measured. The lower the oxygen concen-
tration in the sample gas, the longer the
analyzer will take to reach equilibrium.
To abort the quick start, move the cursor
to the “Exit quick start!” line and press the
↵ key. The quick start process will cease
but another quick start should not be at-
tempted until the “Next quick start possi-
ble after:” timer reaches zero. This timer
provides the means to avoid more than
two quick starts in any 24 hour period.
The “Quick Start” function can be ac-
cessed from the “Measure” display by
pressing F5 (BasicCal) or from the Main
Menu as follows:
Figure 3-9. Initiate Quick Start
From the Main Menu, move the cursor to
Analyzer basic controls (calibration) &
setup…
In the Basic controls and Setup menu, move
the cursor to the “Initiate quick start!” line and
press the
↵ key. The analyzer will begin the
quick start function immediately. This proc-
ess will take about 45 seconds. The “Quick
start timer” will count down this period.
The last measured value is held for the dura-
tion of the process to prevent false reading
fluctuations.
TO2 37.50 ppm
Measure Status… Channel Lock… MFG Data
-- Main Menu --
Analyzer basic controls (calibration) & setup…
Analyzer and I/O, expert controls & setup…
System configuration and diagnostics…
Display controls…
Time & Date: 10:30:05 August 10 2001
System tag: Fisher-Rosemount
TO2 37.50 ppm
Measure Status… Back…
-- Basic Controls and Setup --
Range number: 4
Range upper limit: 100 ppm
Initiate quick start!
Exit quick start!
Exit Sleep mode!
Next quick start possible after: 35343 s
Quick start timer: 45 s
Sleep mode timer: 2700 s
Operation status: Normal