Emerson 755A Manual De Usuario

245364-V

May 2002

Rosemount Analytical Inc.    A Division of Emerson Process Management                                                                         Operation     3-11

Model 755A

0 +                                                                                       =

0

100

[100((-0.623)-(-0.358))]-100((-0.623)-(-0.358))

100

0-100(-0.265)

100

= 0.265

21+                                 = 21 +                          = 21.21%

21+                                                                                =

21

100

[100((-0.623)-(-0.358))]-100((-0.623)-(-0.358))

100

0-211(-26.5)-(-26.5)

100

-5.565+26.5

100

Example:

Sample is oxygen in a background of
CO

2

.  (Oxygen equivalent of CO

2

 is -

0.623).

Standard is the following:

Pure nitrogen for ZERO gas.

21% oxygen, 79% nitrogen for SPAN gas.
(Oxygen equivalent of nitrogen is -0.358).

With nitrogen ZERO gas flowing, Adjusted
Value is the following:

Display should be made to read 0.265%
oxygen with ZERO control.

With SPAN gas (21% oxygen, 79%
nitrogen) flowing, Adjusted Value is the
following:

Display should be made to read 21.21%
oxygen with SPAN control.

In limiting cases the general equation
reduces to simpler forms:

1.  If the SPAN gas is 100% oxygen,

there is no background gas and thus
no correction.

2.  If the ZERO gas is oxygen-free, the

adjusted value for setting the ZERO
control becomes -((-0.623)-(-0.358)).
When the ZERO gas is more
diamagnetic than the background gas
in the sample, this difference is
negative.  Use a recorder with below-
zero capability to set negative values.

Acetylene, C

2

H

2

-0.612

Allene, C

3

H

4

-0.744

Ammonia, NH

3

-0.479

Argon, A

-0.569

Bromine, Br

2

-1.83

1,2-Butadiene C

4

H

6

-1.047

1,3-Butadiene C

4

H

6

-1.944

n-Butane, C

4

H

10

-1.481

iso-Butane, C

4

H

10

-1.485

Butene-1, C

4

H

8

-1.205

cis Butene-2, C

4

H

8

-1.252

iso-Butene, C

4

H

8

-1.201

trans butene-2, C

4

H

8

-1.274

Carbon Dioxide CO

2

-0.623

Carbon Monoxide, CO

-0.354

Ethane, C

2

H

6

-0.789

Ethylene, C

2

H

4

-0.553

Helium, H

e

-0.059

n-Heptane, C

7

H

16

-2.508

n-Hexane, C

6

H

12

-2.175

cyclo-Hexane, C

6

H

12

-1.915

Hydrogen, H

2

-0.117

Hydrogen Bromide, Hbr

-0.968

Hydrogen Chloride, HC1

-0.651

Hydrogen Fluoride, HF

-0.253

Hydrogen Iodide, HI

-1.403

Hydrogen Sulphide, C

2

S

-0.751

Kryton, Kr

-0.853

Methane, CH

4

-0.512

Neon, Ne

-0.205

Nitric Oxide, NO

+44.2

Nitrogen, N

2

-0.358

Nitrogen Dioxide, NO

2

+28.7

n-Octane, C

8

H

18

-2.840

Oxygen, O

2

+100.0

n-Pentane, C

5

H

12

-1.810

iso-Pentane, C

5

H

12

-1.853

neo-Pentane, C

5

H

12

-1.853

Propane, C

3

H

8

-1.135

Propylene, C

3

H

6

-0.903

Water, H

2

O

-0.381

Xenon, Xe

-1.340