Agilent Technologies 490 Micro GC Manuale utente

Agilent Technologies

Agilent 490

Micro GC Natural Gas

Analyzer

User Manual

Notices

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in any form or by any means (including

electronic storage and retrieval or transla-

tion into a foreign language) without prior

agreement and written consent from

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United States and international copyright

laws.

Manual Part Number

G3582-90002

Edition

First edition, May 2012

Printed in USA

Agilent Technologies, Inc.

2850 Centerville Road

Wilmington, DE 19808-1610 USA

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The material contained in this docu-

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ject to being changed, without notice,

in future editions. Further, to the max-

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Safety Notices

CAUTION

A CAUTION notice denotes a

hazard. It calls attention to an oper-

ating procedure, practice, or the

like that, if not correctly performed

or adhered to, could result in

damage to the product or loss of

important data. Do not proceed

beyond a CAUTION notice until the

indicated conditions are fully

understood and met.

WARNING

A WARNING notice denotes a

hazard. It calls attention to an

operating procedure, practice, or

the like that, if not correctly per-

formed or adhered to, could result

in personal injury or death. Do not

proceed beyond a WARNING

notice until the indicated condi-

tions are fully understood and met.

Natural Gas Analyzer 3

Contents

1 Agilent 490 Micro GC - Natural Gas Analyzers

Introduction 5

Types of Agilent 490 Micro GC - Natural Gas Analyzers 5

Agilent 490 Micro GC - Natural Gas Analyzer A and the Extended

Version 6

Natural Gas Analyzer A 6

Natural Gas Analyzer A Extended 6

Agilent 490 Micro GC - Natural Gas Analyzer B and the Extended

Version 7

Natural Gas Analyzer B 7

Natural Gas Analyzer B Extended 7

2 Checkout Information

Introduction 8

Natural Gas Analyzer A and the A Extended Version 10

HayeSep A straight 10

6 meter CP-Sil 5 CB 11

HayeSep A backflush 13

4 meter CP-Sil 5 CB 14

8 meter CP-Sil 5 CB 16

Natural Gas Analyzer B and B Extended Version 18

PoraPLOT U 18

6 meter CP Sil 5 CB 20

CP-Molsieve 5A 22

3 Tuning the Backflush Time

Tuning the Backflush Time on CP-Molsieve 5A, PoraPLOT U, or CP-Sil 5

CB 24

Tuning procedure for the backflush time 24

Tuning the Backflush Time on a HayeSep A 26

Tuning procedure for HayeSep A channel 26

Natural Gas Analyzer 4

A Appendix A: Certificate of the NGA Gas Calibration Standard

B Appendix B: Certificate of the Universal Gas Calibration Standard

C Appendix C: Typical Method Settings for Natural Gas Analyzers

D Appendix D: Carrier Gas Type Configuration

Procedure to Change the Carrier Gas Type 32

E Appendix E: Method for CP-Molsieve 5A Channel with Carrier Gas Argon

Agilent 490 Micro GC Natural Gas Analyzer

User Manual

Agilent Technologies

Agilent 490 Micro GC - Natural Gas

Analyzers

Introduction

Natural gas is a fossil fuel. Millions of years ago, the remains of

plants, animals, and micro-organisms were buried underneath

layers of soil and sediment. Due to the weight of the soil and

sediment, the pressure and temperature increased. This

resulted in the slow transformation of the organisms into

natural gas and oil.

The composition of natural gas varies widely. Natural gas is a

combustible mixture of hydrocarbon gases that mainly consists

of methane, smaller amounts of light hydrocarbons such as

ethane, propane, n-butane, n-pentane, hexanes plus, and other

gases such as nitrogen, carbon dioxide, oxygen, hydrogen, and

hydrogen sulfide. Natural gas can also contain traces of argon,

helium, neon, and xenon. Natural gas in its pure form is

colorless and odorless.

Natural Gas Analyzers have been designed to analyze the

different compositions of natural gas.

Types of Agilent 490 Micro GC - Natural Gas Analyzers

The following four types of Natural Gas Analyzers can be used

to analyze natural gas:

•The Agilent 490 Micro GC - Natural Gas Analyzer A

•The Agilent 490 Micro GC - Natural Gas Analyzer A Extended

•The Agilent 490 Micro GC - Natural Gas Analyzer B

•The Agilent 490 Micro GC - Natural Gas Analyzer B Extended

Agilent 490 Micro GC - Natural Gas Analyzers 1

Natural Gas Analyzers 6

Agilent 490 Micro GC - Natural Gas Analyzer A and the Extended Version

Natural Gas Analyzer A

The Agilent 490 Micro GC - Natural Gas Analyzer A is used to

analyze natural gas samples containing methane, carbon

dioxide, and hydrocarbons up to n-nonane.

The Agilent 490 Micro GC - Natural Gas Analyzer A is a dual

cabinet micro GC equipped with two channels:

•HayeSep A channel (straight)

•6 meter CP-Sil 5 CB channel

Natural Gas Analyzer A Extended

The Agilent 490 Micro GC - Natural Gas Analyzer A Extended is

used to analyze methane, carbon dioxide, and hydrocarbons up

to n-dodecane.

The Agilent 490 Micro GC - Natural Gas A Extended is a quad

cabinet micro GC equipped with three channels:

•HayeSep A channel with a backflush option

•4 meter CP-Sil 5 CB channel with a backflush option

•8 meter CP-Sil 5 CB channel

Agilent 490 Micro GC - Natural Gas Analyzers 1

Natural Gas Analyzers 7

Agilent 490 Micro GC - Natural Gas Analyzer B and the Extended Version

Natural Gas Analyzer B

The Agilent 490 Micro GC - Natural Gas Analyzer B is used to

analyze methane, carbon dioxide, hydrogen sulfide, and light

hydrocarbons up to n-nonane in natural gas.

The Agilent 490 Micro GC - Natural Gas Analyzer B is a dual

cabinet micro GC equipped with two channels:

•PoraPLOT U channel with a backflush option

•6 meter CP-Sil 5 CB channel

Natural Gas Analyzer B Extended

The Agilent 490 Micro GC - Natural Gas Analyzer B Extended is

used to analyze hydrogen, nitrogen, oxygen, methane, carbon

dioxide, carbon monoxide, hydrogen sulfide, and hydrocarbons

up to n-nonane.

The Agilent 490 Micro GC - Natural Gas Analyzer B Extended is

a quad cabinet micro GC equipped with three channels:

•CP-Molsieve 5A channel with a backflush option

•PoraPLOT U channel with a backflush option

•6 meter CP-Sil 5 CB channel

The Natural Gas Analyzer B Extended version is equipped with

a dual carrier gas option for the CP-Molsieve 5A channel. It is

made flexible for analysis of hydrogen and helium on the

CP-Molsieve 5A channel if required. For the analysis of helium

on the CP-Molsieve 5A channel, the carrier gas must be argon.

All analyzers are factory tuned on carrier gas helium.

Before starting up the Agilent 490 Micro GC - Natural Gas

Analyzer, ensure that correct carrier gases are connected for all

channels. For all types of analyzers, the required carrier gas is

helium. However, to analyze helium on the CP-Molsieve 5A, the

carrier gas must be argon. The required pressure for carrier gas

is 550 kPa (80 psi). For more information on the Agilent 490

Micro GC, see the Agilent 490 Micro GC User Manual.

Agilent 490 Micro GC Natural Gas Analyzer

User Manual

Agilent Technologies

Checkout Information

Introduction

The Agilent 490 Micro GC - Natural Gas Analyzers are factory

tuned on carrier gas helium including appropriate settings for

back flush times for the following channels:

•HayeSep A

•4 meter CP-Sil 5 CB

•CP-Molsieve 5A

•PoraPLOT U

The final checkout of the Agilent 490 Micro GC - Natural Gas

Analyzer is performed with a NGA Gas Calibration standard

and a Universal Gas Calibration standard.

•The NGA Gas Calibration standard contains nitrogen,

methane, ethane, carbon dioxide, propane, iso-butane,

n-butane, iso-pentane, n-pentane, and n-hexane. This natural

gas standard does not contain all components specified for

each type of Natural Gas Analyzer. Therefore, a second

checkout sample, the Universal Gas Calibration standard is

analyzed on the Natural Gas Analyzer.

•The Universal Gas Calibration standard contains helium,

neon, hydrogen, oxygen, nitrogen, methane, ethane, ethylene,

carbon dioxide, carbon monoxide, acetylene, propane,

methyl acetylene, n-butane, n-hexane, and n-heptane. Not all

components in the Universal Gas Calibration standard are

specified for the Natural Gas Analyzer.

Checkout Information 2

Natural Gas Analyzers 9

More detailed information about the NGA Gas Calibration

standard and the Universal Gas Calibration standard can be

found in Appendix Aon page 27 and Appendix Bon page 28.

The components specified for each channel are described in

“Agilent 490 Micro GC - Natural Gas Analyzer A and the

Extended Version” on page 6 and “Agilent 490 Micro GC -

Natural Gas Analyzer B and the Extended Version” on page 7.

The NGA Gas Calibration standard and the Universal Gas

Calibration standard are shipped with the analyzer and used by

the Agilent Customer Engineer at installation. The factory

tuned method, final chromatogram (Test Report), and the

Natural Gas Analyzer User Manual are supplied on the Analyzer

CD.

To perform reference checks on the analyzer, use the NGA Gas

Calibration standard or the Universal Gas Calibration standard.

If OpenLAB CDS EZChrom is used, load the method from the

analyzer CD or create a method using the settings from the

method pdf-file available on the analyzer CD. For a quick start,

see the method settings for Natural Gas Analyzers listed in

Appendix Con page 29. Connect and inject the NGA Gas

Calibration standard.

To analyze helium on the CP-Molsieve 5A channel, use the

Universal Gas Calibration standard for the checkout. Ensure

that the carrier gas argon is supplied and configured before

starting the analysis. For more information on how to configure

the carrier gas for the analyzer see Appendix Don page 31.

Method settings for this analysis can be found in Appendix Eon

page 35.

The NGA Gas Calibration standard and the Universal Gas

Calibration standard do not contain hydrogen sulfide. A

reference chromatogram of hydrogen sulfide is included in this

manual.

Checkout Information 2

Natural Gas Analyzers 10

Natural Gas Analyzer A and the A Extended Version

HayeSep A straight

The HayeSep A channel of the Natural Gas Analyzer A is

specified for the analysis of methane, carbon dioxide, ethane,

and propane.

Analysis of the NGA Gas Calibration standard results in the

chromatogram shown in Figure 1.

Analysis of the Universal Gas Calibration standard results in a

chromatogram similar to Figure 2

Figure 1 NGA Gas Calibration standard analyzed with the HayeSep A channel on Analyzer A

Seconds

010 20 30 40 50 60 70 80 90 100

100

150

200

250

300

Nitrogen

Methane

Carbon Dioxide

Ethane

Propane

Figure 2 Universal Gas Calibration standard analyzed with the HayeSep A channel on Analyzer A

Seconds

010 20 30 40 50 60 70 80 90 100

Carbon Dioxide

Ethylene

Ethane

Acetylene

Propane

Nitrogen

Methane

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