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ABB DBDID Process gas chromatographs

New industry applications for

ppm and ppb measurements.

Measurement made easy

—

Application

Usage

The Dielectric Barrier Discharge Ionization

Detector (DBDID) is used in ABB analytical process

gas chromatographs for parts-per-billion (ppb)

and parts-per-million (ppm) measurements of

the following:

• Impurities in high purity gases

• Halogenated hydrocarbons

• Impurities in ethylene

• Low levels of BTX

• Arsine and phosgene

• Ammonia

• Nitric oxide

—

Description

A dielectric barrier discharge is a plasma

discharge that is obtained using a high voltage

alternating current applied to a gas such as

Helium or Argon as it flows through a dielectric

material such as quartz glass. Two electrodes are

arranged within the detector so that when the

high voltage is applied to the gas, a breakdown

occurs with a subsequent discharge from one

electrode to the other. The presence of the

dielectric barrier behaves as a capacitor in the

localized region of the discharge. The dielectric

barrier stores a substantial amount of energy for

each discharge which results in the generation of

highly excited state molecules and atoms of

Helium or Argon which is referred to as the reaction gas. As the sample components elute from

the column they are ionized by the reaction gas

and a second set of electrodes in the detector

measures the current generated from the ionized

components. The output is sent to an electrometer where it is amplified.

Specification

Environmental (enclosure)

The device is only suitable for use in clean dry areas.

Operation temperature range

+50 to +150 °C (122 to 302 °F)

Installation and mounting

Integrated and configured with the PGC2000 and

PGC5000 series process gas chromatographs.

—

Safety area classification

NEC

Class I, Division 2 Group B, C, D with Type X-Purge T4, T3,

or T2

Conforms to ATEX directive 2004/108/EC

Zone 2: CE; II 3G Ex px d [ib] ib IIB+H2 T4, T3, or T2 with

Type X-Purge

—

Power

Voltage

Plasma reactor 12V, 1.0A Total power consumption less

than 20 Watts.

X-Purge timeout

4.6 minutes @ 60 Hz, 5.5 minutes @ 50 Hz

Note

T-code and protection method are dependent

upon application.

—

Modes of operation

Helium ionization mode

In this mode the detector is sensitive to all organic and

inorganic volatile components except neon. Operating in

this mode, sub parts per million levels of fixed gases can

be easily measured.

Argon ionization mode

In this mode the detector is not sensitive to fixed gases

and methane but it is sensitive to a wide range of organic

and inorganic volatile components. It is capable of ionizing

any component with an ionization potential less than 11.5

eV. This is an excellent detector for compounds such as

BTEX compounds.

Detector sensitivity

Note

Sensitivity is a function of the total application design. It

depends on the mode of operation and on the ionization

potential of the analyte. Sensitivity values are given with 4

to 1 minimum signal to noise ratios.

Helium ionization mode

Sensitive to fixed gases down to about 0.5 ng on column,

using hydrogen as the indicator.

Argon ionization mode

Sensitive to benzene down to 20 picograms.

—

Gas consumption

Reaction gas flow

Helium mode: 100 ml/min

Argon mode: 5-20 ml/min

Carrier gas flow

Packed columns: 20-60 ml/min per analytical valve

—

Utility Specification

Helium ionization mode

Minimum of Grade 5 helium for carrier and reactor gas

supplies.

Argon ionization mode

Minimum of Grade 5 helium, nitrogen, or hydrogen for

carrier supply.

Minimum of Grade 5 or argon for carrier supply

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