Instruction Manual

760007-A July 2003

Model NGA2000 PMD

In two limiting cases, the general equation is reduced to simpler forms.

1.If the span standard gas is 100% oxygen, the adjusted oxygen value is the same as the true value (i.e., 100% O2).

2.If the zero standard is an oxygen-free zero gas, the adjusted value for setting the ZERO Control = BGGst-BGGs. (If the oxygen-free zero gas is more diamagnetic than the background gas in the sam- ple, this difference is negative. The negative value may be entered in the Calibration Gas List.)

Alternately, the user can avoid these compensation calculations by using zero and span gases which have been specially prepared to contain the expected amounts of background gas. Calibration of the analyzer module will then factor in background gas effects in the same proportions as normal run mode measure- ment.

GAS

EQUIV. % AS O2

Acetylene, C2H2

-0.612

Allene, C3H4

-0.744

Ammonia, NH3

-0.479

Argon, A

-0.569

Bromine, Br2

-0.83

1,2-Butadiene, C4H6

-1.047

1,3-Butadiene, C4H6

-0.944

n-Butane, C4H10

-1.481

iso-Butane, C4H10

-1.485

Butene-1, C4H8

-1.205

cis Butene-2, C4H8

-1.201

iso-Butene, C4H8

-1.274

trans Butene-2, C4H8

-1.274

Carbon Dioxide, CO2

-0.623

Carbon Monoxide, CO

-0.354

Ethane, C2H6

-0.789

Ethylene, C2H4

-0.553

Helium, He

-0.059

n-Heptane, C7H16

-2.508

n-Hexane, C6H14

-2.175

cyclo-Hexane, C6H12

-1.915

Hydrogen, H2

-0.117

GAS

EQUIV. % AS O2

Hydrogen Bromide, Hbr

-0.968

Hydrogen Chloride, HC1

-0.650

Hydrogen Fluoride, HF

-0.253

Hydrogen Iodide, HI

-1.403

Hydrogen Sulhide, H2S

-0.751

Krypton, Kr

-0.853

Methane, CH4

-0.512

Neon, Ne

-0.205

Nitric Oxide, NO

+44.2

Nitrogen, N2

-0.358

Nitrogen Dioxide, NO2

+28.7

Nitrous Oxide, N2O

-0.560

n-Octane, C8H18

-2.840

Oxygen, O2

+100.0

n-Pentane, C5H12

-1.810

iso-Pentane, C5H12

-1.853

neo-Pentane, C5H12

-1.853

Propane, C3H8

-1.135

Propylene, C3H6

-0.903

Water, H2O

-0.381

Xenon, Xe

-0.340

Table 3-4. Oxygen Equivalents of Common Gases

3-10 Operation

Rosemount Analytical Inc. A Division of Emerson Process Management