Simplicity 4040 Specifications download pdf (Page 17)

Operational Theory Series 4040

Teledyne Analytical Instruments 17

Operational Theory

2.1 Introduction

The sample is brought to sample loop and a 10-port switching valve

kept inside a heated (Temperature: 50° - 80° C per application)

SAMPLE Chamber. Using a carrier gas and a microprocessor actuated

switching valve, a fixed volume of sample collected in the Sample Loop,

is pushed into the Column maintained at a constant temperature. The

eluted gas is analyzed for methane in a FID detector. Immediately, at

the end of the analysis of methane, the Valve is switched to reverse the

flow through the Column, causing propane as NMH to elute and be

analyzed.

Series 4040 uses a Flame Ionization Detector to sense hydrocarbons.

The FID was selected based on the positive performance and extensive

experience in the use of this detector in other Teledyne analyzers namely

Model 402R and Model 4020. The FID has proven itself to be a rugged,

stable, long life sensor giving years of trouble free operation in various

applications.

A packed Column was used at a constant temperature to separate

methane from the remaining non-methane hydrocarbons.

The analysis has 2 modes: Methane Mode and Non-methane Mode.

1) Methane Mode (POSITION B)

In this mode, the eluted sample from the column is fed to the FID for

the analysis of the methane content of the hydrocarbons.

2) Non-methane Mode (POSITION A)

During this mode, the FID detector is monitoring Non-methane

hydrocarbons, such as propane. At the end of the cycle, the methane

content of the sample (from Position B) is added to the NMH value

to compute THC values.

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Simplicity 4040 Specifications Page 17