Instruction Manual
760000-C
November 2002
3-14 Operation Rosemount Analytical Inc. A Division of Emerson Process Management
Model NGA2000 CLD
CLD
7.50 ppm
HOME
Linearity coefficients
Curve 1
A0 coefficient: 0.000000
A1 coefficient: 1.000000
A2 coefficient: 0.000000
A3 coefficient: 0.000000
A4 coefficient: 0.000000
Curve upper limit: 10.0 ppm
Curve over-range: 5.0 %
Curve under-range: 5.0 %
Status: Disabled
INFO
ESCAPE
NEXT
LAST
CLD
7.50 ppm
HOME
-- Linearization Parameters --
INFO
Range 1 linearizer: Disabled
If enabled, uses curve no.: 1
Range 2 linearizer: Disabled
If enabled, uses curve no.: 2
Range 3 linearizer: Disabled
If enabled, uses curve no.: 3
Range 4 linearizer: Disabled
If enabled, uses curve no.: 4
Set coefficients…
ESCAPE
CLD
7.50 ppm
HOME
-- Gas measurement parameters --
INFO
Linearization parameters…
Response time/delay parameters…
Range settings…
Automatic range change parameters…
Units…
Linearization functions…
ESCAPE
Press the Back (F2) softkey before press-
ing the
↵
softkey to restore the previous
value.
Alarm delay:
Set the alarm delay for the desired time
delay after the concentration value ex-
ceeds the limit before the alarm is acti-
vated.
Alarm generation is:
This setting establishes the generation of
alarms as “Off,” “On,” or “On (Hold
Alarm).” The “On (Hold Alarm)” setting
provides that the alarm will remain active
even after the gas concentration returns
below the appropriate level until the
ACKN softkey is pressed or it is reset
from the remote I/O.
ACKN
Press the F3 softkey to acknowledge and
reset any alarm.
d. Linearization
Parameters
Linearization parameters allows the es-
tablishment of linearizer coefficients and
the assignment of coefficient sets to indi-
vidual ranges.
Main Menu
↓
Analyzer and I/O expert controls &
setup…
↓
Analyzer module setup…
↓
Gas measurement parameters…
Figure 3-16. Gas Measurement
Parameters Menu
From the Gas measurement parameters
menu, select Linearization parameters…
Figure 3-17. Linearization Parameters
Menu
The linear polynomials act over a range
(not the same as the measurement
range). The system uses the linearizer
polynomial appropriate for the measure-
ment range chosen. This is the polyno-
mial with the next higher range. It is,
however, possible to specify that the ana-
lyzer use a wider range polynomial.
Note that the use of different polynomials
on different ranges will give different read-
ings on a new range.
Coefficients may be edited for custom
curves.
Figure 3-18. Linearity Coefficients
Menu
Edit the polynomial coefficients as de-
sired. Make sure that the curve upper limit
is correct. This is the limit of the range
that this polynomial will support.
The last line (Status) selects whether the
curve is in use. Use the NEXT (F3),
LAST (F4), and BACK (F4) softkeys to
access all four curves.
