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Instruction Manual
760000-C
November 2002
3-18 Operation Rosemount Analytical Inc. A Division of Emerson Process Management
Model NGA2000 CLD
CLD
7.50 ppm
HOME
-- Units --
Gas measurement units: ppm
Pressure measurement units: hPa
Temperature measurement units: C
Ppm to mg/Nm3 conversion factor: 1.000
Lower explosion limit (LEL): 0.00 %
Upper explosion limit (UEL) 0.00 %
Variable are still sent as the basic SI unit.
INFO
ESCAPE
CLD
7.50 ppm
Measure
-- Actual Switch Levels --
Range – 1 up: 10.0 ppm
Range – 1 down: -1000000 ppm
Range – 2 up: 25.0 ppm
Range – 2 down: 9.0 ppm
Range – 3 up: 100.0 ppm
Range – 3 down: 22.5 ppm
Range – 4 up: 250.0 ppm
Range – 4 down: 90.0 ppm
Back…
select the submenu “Actual switch lev-
els…”.
Figure 3-25. Actual Switch Levels
Menu
h. Display
Units
This menu function is used to set the dis-
played units for the various parameters.
This only affects the displayed values. All
outputs are in the basic SI units which, for
example, for pressure is hPa. Gas con-
centration values are for all ranges. Indi-
vidual ranges cannot be set to different
units.
Main Menu
↓
Analyzer and I/O expert controls &
setup…
↓
Analyzer module setup…
↓
Gas measurement parameters…
↓
Units…
]
Figure 3-26. Display Units Menu
Select the desired parameter and change
the units as follows:
Gas measurement units:
ppm, %, ppb, mg/Nm3
Pressure measurement units:
hPa, psig
Temperature measurement units:
C, F
ppm to mg/Nm3 conversion factor:
The ppm to mg/Nm
3
conversion factor in
the range of 1 to 100000 according to the
formula:
MW
NO 30.0
NO
2
46.0
CO 28.0
SO
2
64.1
O
2
32.0
Lower explosion limit (LEL) and upper
explosion limit (UEL):
These parameters are used for the PMD,
FID2 and NDIR modules and do not apply
to the CLD. They should both be set at
0.00%.
i.
Physical Measurements & Pressure
Limits
This menu is used to display the physical
diagnostic parameters of the CLD ana-
lyzer and to set the various pressure lim-
its.
In the Physical measurements display,
the normal values for the displayed values
are:
Sample capillary pressure: 7 psig
Ozone supply pressure: 15 psig
Ozonator status: On
Ozonator power: Enabled
Bypass flow: 800 cc/min
mg/Nm
3
= Molecular weight
24.45