K-WANG
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ABB DBDID Process gas chromatographs
ABB DBDID Process gas chromatographs
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.
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
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.
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
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.
High voltage alternating current plasma discharge
• Helium or argon ionization modes
• New industry applications for ppm and ppb measurements
• Impurities in high purity gases
• Halogenated hydrocarbons
• Impurities in ethylene
• Low levels of BTX
• Arsine and phosgene
• Ethylene oxide
• Formaldehyde
• Ammonia
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