View all results

GC & Precision - Getting the Right Information 

Full screen preview

Resource tools

Original PDF File

1.6 MB Download
Resource details

Resource ID

1038

Access

Open

Contributed by

Edward Connor

Title

GC & Precision - Getting the Right Information

Keywords

Acquisition method, Agilent GC, Calculating split and splitless carrier gas flows

Product Range

Precision

Language

UK English

Company Brand

Peak Scientific

Public / Private

private

How to get acquisition method information from Agilent and Shimadzu systems. How to interpret method information. How to calculate split and splitless inlet flows.

Extracted text

GC - Getting the right information

Author: Ed Connor Date / Rev: June 2015
Confidential, unpublished property of Peak Scientific Ltd. Do not duplicate or distribute. Use and distribution limited solely to authorized personnel. © 2015 Peak Scientific Ltd.

Ask for a copy of the acquisition method – if unavailable, ask for the key gas and flow information

If no acquisition method available the customer needs to provide carrier total flow (column flow + split flow + purge flow) and detector flow information

What carrier gas is being used?

H2 or N2

What is the total carrier gas flow being used?
X 1.25 if converting to hydrogen

He
Is the customer converting to N2 or H2?

YES

NO
What detectors are being used?

Calculate total carrier flow required for all GCs

Calculate flow rates of hydrogen, Zero air and nitrogen for flame, flame support and make-up gas

*If customer was using helium carrier, have they considered using nitrogen for make-up gas? *For ECD detectors, quote Trace Nitrogen

Carrier & Detector Gas Options
FID He Carrier gases H2 N2 H2 Combustion gases Zero Air 300-500 60-100 60
Trace

FPD

NPD

ECD

TCD

SCD

MSD

*

30-50

50-75

2-5

40-100

40-100

Makeup gas

N2

10-40 Reference gas
H2

60

5-10

60

10 - 75
N2

* Can be used, but check with Product management before quoting

Confidential, unpublished property of Peak Scientific Ltd. Do not duplicate or distribute. Use and distribution limited solel y to authorized personnel. © 2015 Peak Scientific Ltd.

Acquisition method

Confidential, unpublished property of Peak Scientific Ltd. Do not duplicate or distribute. Use and distribution limited solel y to authorized personnel. © 2015 Peak Scientific Ltd.

Acquisition method

Confidential, unpublished property of Peak Scientific Ltd. Do not duplicate or distribute. Use and distribution limited solel y to authorized personnel. © 2015 Peak Scientific Ltd.

Acquisition method

Confidential, unpublished property of Peak Scientific Ltd. Do not duplicate or distribute. Use and distribution limited solel y to authorized personnel. © 2015 Peak Scientific Ltd.

Agilent Example 1

Confidential, unpublished property of Peak Scientific Ltd. Do not duplicate or distribute. Use and distribution limited solel y to authorized personnel. © 2015 Peak Scientific Ltd.

Agilent Example 2

Confidential, unpublished property of Peak Scientific Ltd. Do not duplicate or distribute. Use and distribution limited solel y to authorized personnel. © 2015 Peak Scientific Ltd.

Shimadzu systems

Confidential, unpublished property of Peak Scientific Ltd. Do not duplicate or distribute. Use and distribution limited solel y to authorized personnel. © 2015 Peak Scientific Ltd.

Carrier Gas Calculations
 The aim of calculating the carrier gas flow rate is to find the ‘total flow’ of the carrier gas.  Knowing the total flow allows us to recommend the correct generator(s) to support the GC  Most GCs use a split/splitless injector  The calculation of flow rates differs depending on whether the method uses split injection or splitless injection

Confidential, unpublished property of Peak Scientific Ltd. Do not duplicate or distribute. Use and distribution limited solel y to authorized personnel. © 2015 Peak Scientific Ltd.

Split injection calculation

Confidential, unpublished property of Peak Scientific Ltd. Do not duplicate or distribute. Use and distribution limited solel y to authorized personnel. © 2015 Peak Scientific Ltd.

Splitless injection calculation

Confidential, unpublished property of Peak Scientific Ltd. Do not duplicate or distribute. Use and distribution limited solel y to authorized personnel. © 2015 Peak Scientific Ltd.