Agilent Technologies G3183B Operating instructions

Agilent Technologies

Agilent G3183B

Three-Way Splitter Kit

Installation and Operation

Guide

2 Installation and Operation Guide

Notices

No part of this manual may be reproduced in

any form or by any means (including elec-

tronic storage and retrieval or translation

into a foreign language) without prior agree-

ment and written consent from Agilent

Technologies, Inc. as governed by United

States and international copyright laws.

Manual Part Number

G3183-90120

Supercedes G3183-90110

Edition

First edition, April 2006

Printed in USA

Agilent Technologies, Inc.

2850 Centerville Road

Wilmington, DE 19808-1610 USA

Safety Notices

CAUTION

A CAUTION notice denotes a haz-

ard. It calls attention to an operat-

ing 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.

Acknowledgement

Microsoft® is a U.S. registered trademark

of the Microsoft Corporation.

Installation and Operation Guide 3

In this Guide. . .

This Installation and Operation Guide contains information for installing and

using an effluent splitter on an Agilent 6890 gas chromatograph (GC). The

G3183B splitter is intended for use with capillary columns and uses makeup

gas to maintain adequate flows throughout the system.

1 Introduction

This chapter describes how the splitter works, the GC and software

requirements of the system and the contents of the installation kit.

2 Hardware Installation

See this chapter for a detailed procedure for installing the splitter hardware

and connecting the makeup gas supply.

3 Splitter Configurations

The split ratio (how the column effluent divides among the three detectors) is

governed by three restrictors, which are lengths of deactivated fused silica

tubing. This chapter presents a set of precalculated “typical” configurations. If

desired, you can create a custom configuration to meet specific needs. The

chapter describes a set of software tools, included in the kit, to assist you in

designing such configurations. Finally, installation of the column and

restrictors is covered.

4Operation

This chapter contains a worked-out custom configuration, plus a few special

topics.

4 Installation and Operation Guide

Installation and Operation Guide 5

Contents

1 Introduction

Overview 8

How It Works 9

Details 10

Calculation of chromatographic parameters 11

Gas Requirements 12

Carrier gas 12

Makeup gas 12

GC Requirements 12

Other Requirements 12

Parts Supplied 13

Part Identification 14

Parts Not Supplied 15

Tools Required 15

Pressure Units 16

Gauge pressure (psig) 16

Absolute pressure (psia) 16

Atmospheric pressure 16

Conversion 16

2 Installation

Prepare the GC 18

Install the Column Clips 20

Install the Bracket and Splitter 21

Connect the Makeup Gas Supply 24

To supply the makeup gas from a Pneumatic Control Module (PCM) 24

To supply the makeup gas from an Auxiliary Pressure controller 24

6 Installation and Operation Guide

3 Splitter Configurations

Typical Configurations 26

Splitting to an MSD 28

Custom Configurations 29

Restrictor id and length 32

Maximum and minimum flows 33

Column outlet pressure 34

Inlet pressure 34

Restrictor and Column Installation 35

Install the column 35

Connect the splitter 35

Disconnect tubing from the splitter 36

4Operation

An Example 40

Column flow 40

Select restrictors 42

Calculate column flow 43

Calculate MSD restrictor flow 44

Calculate FPD restrictor flow 45

Calculate ECD restrictor flow 46

Changing Columns Without Venting the MSD 47

Backflushing the Column 48

Other Uses for Three-Way Splitter Setup 50

Three-way splitter 50

Two-way splitter 50

Two columns in/Two detectors out 51

Two different columns in/Two detectors out 52

Agilent G3183B Splitter Kit

Installation and Operation Guide

Agilent Technologies

Introduction

Overview 8

How It Works 9

Details 10

Calculation of chromatographic parameters 11

Gas Requirements 12

Carrier gas 12

Makeup gas 12

GC Requirements 12

Other Requirements 12

Parts Supplied 13

Part Identification 14

Parts Not Supplied 15

Tools Required 15

This manual covers the installation and operation of the G3183B effluent

splitter with makeup kit on the Agilent 6890 series gas chromatograph (GC).

8 Installation and Operation Guide

1Introduction

Overview

Splitter installation is done in three steps:

1Hardware installation. This gets the hardware installed and the gas flows

connected.

2Restrictor configuration. You can choose to use a typical, precalculated

configuration or create a custom one using software tools supplied on a CD.

3Restrictor and column installation. Using the results of step 2, cut the

appropriate lengths of the appropriate diameter tubing for the restrictors.

Install the restrictors and the analytical column.

Introduction 1

Installation and Operation Guide 9

How It Works

The splitter divides the effluent from a column among three different

detectors. The detectors can be operating at different pressures, that is, any

mix of the following can be used:

• Atmospheric pressure

FID (flame ionization detector)

TCD (thermal conductivity detector)

NPD (nitrogen phosphorus detector)

ECD (electron capture detector)

FPD (flame photometric detector)

• Below atmospheric pressure

MSD (mass selective detector)

• Above atmospheric pressure

AED (atomic emission detector)

The split ratio is determined by the length and diameter of tubing connecting

the splitter to the detectors. Tubing dimensions may be determined from

Table 2 on page 26 in this manual or from a spreadsheet calculator that is

included for calculating tubing dimensions for special situations.

Figure 1 shows the plumbing configuration for the G3183B splitter.

Figure 1 Splitter plumbing

Inlet Aux EPC Det 1 Det 2

MSD

Column

GC oven

Splitter

Restrictor 1

Restrictor 2

Restrictor 3

10 Installation and Operation Guide

1Introduction

The column flow mixes with the makeup flow in the splitter. This mixture then

flows through lengths of uncoated, deactivated, fused-silica tubing to each

detector. These tubes act as flow restrictors. While the flows through the

restrictors change with oven temperature, the ratio of the flows at any

temperature is constant.

Details

The G3183B kit addresses several limitations of previous approaches to

splitting column effluent between three detectors:

Metal ferrules

The splitter uses metal column ferrules, which eliminate air leakage into the

sample stream. Unlike polyimide, metal ferrules do not loosen upon thermal

cycling of the oven. They also do not outgas contaminants or shed particles

(like graphite) that can result in chromatographic problems.

Microfluidic plate

The splitting hardware is based on microfluidic plate technology. This allows

very low dead volume connections between the column end and the three

detector restrictor tubes. The thin metal plate has fast thermal response and is

mounted solidly on the oven wall for ease of use. The interior plate surfaces

are deactivated to prevent adsorption of active compounds.

Constant pressure operation

The splitter uses a source of makeup gas supplied by electronic pneumatics

control (EPC). This maintains the splitter at a known and constant pressure.

Constant pressure allows easier splitting to vacuum detectors like the MSD. It

simplifies choice of splitter parameters, allowing all aspects of the

chromatographic setup to be calculated. Constant pressure makeup allows the

column to be run in constant flow mode while still maintaining a constant

split ratio between three detectors of different operating pressures such as the

FPD and the MSD. Because the EPC pressure can be time programmed, useful

operations like backflushing unwanted heavy materials from the column and

changing columns in MSD systems without venting are possible.

Other uses

Other useful configurations can be set up as described in Chapter 4.

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