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Analytical

Components

Systems

Pulsed Discharge Detector

Model D-4-I

Quick Reference Guide

Detector performance is adversely affected by the

presence of impurities in the gas stream. To minimize

the chance of this occurring:

1. Always use the helium purifier.

2. Never use copper or plastic tubes,

even before the helium purifier.

3. Never use flow controllers containing

polymers or lubricant.

4. Never use pipe fittings or teflon tape

downstream of the purifier.

You will need:

• Helium

99.9999% purity (“six nines”)

Air Liquide part number:

ValGas 4

• Gas regulator

Ultrahigh purity, with stainless steel

diaphragm

Valco part number:

TGA-422-580

•

Valco Helium Purifier

(included with the detector system)

Valco part number:

HP2

• Stainless steel tubing and

Fittings with gold ferrules

(consult the Valco catalog)

• Restrictor

(included with the detector system)

Valco part number:

TGA-R-30F60P

GAS CHROMATOGRAPH

TEE

(ZT1)

DISCHARGE GAS

(99.9999% He)

TGA-R-30F60P

RESTRICTOR

(30 mL/min minimum)

VENT

COLUMN

INLET

DISCHARGE GAS

INLET

VENT

COLUMN

SAMPLE

HELIUM

PURIFIER

Leave column inlet

plugged until flow

rate is set. (See

“Initial Power-Up”

on next page.)

General Precautions:

• Never run the detector without discharge gas. To insure a continuous supply of discharge gas, always

change the gas bottle when it reaches 500 psi.

• Never bake out a column while it is connected to the detector.

• Detector lifetime is shortened in the Ar/Kr PID mode. To maximize detector lifetime, turn off the discharge

power when the GC is not actually analyzing samples.

Gas connections

1 2 3 4

Resumo do Conteúdo

Página 1 - Quick Reference Guide

&AnalyticalComponentsSystemsPulsed Discharge DetectorModel D-4-IQuick Reference GuideDetector performance is adversely affected by thepresence of

Página 2 - Electrical Connections

Caution: •Always make sure that discharge gas isflowing before heating and powering upthe detector.1. Before installing the column, set the gas flow

Página 3 - Troubleshooting

Troubleshooting• No PeaksIf the background current is stable but there are no peaks:1. Check column flow.2. Check the column insertion position (11.4

Página 4 - Hydrogen Leak Test

Hydrogen Leak TestA hydrogen leak test allows you to pinpoint loose fittingsand leaks inside the detector.1. Connect a length of plastic tubing to a r

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Vici D-4-I Quick Start Manual do Utilizador

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