Follow the instructions in this section to turn on or turn off the detector gas flow.

CAUTION

Escaping Gas

Gas can escape from open gas connections when the detector gas flow and/or the gas supply is turned on. The escaping gas can pose a health and safety risk.

  • Make sure that the detector gas flow and the gas supply are turned off before you remove the nebulizer, disconnect the gas tubes or remove the gas filter assembly from the detector.
  • Turn on the gas supply and detector gas flow only when the nebulizer is installed, the components in the gas flow path are properly connected, and the protective cover of the gas filter assembly is installed.

NOTICE

Detector Gas Flow and Pump Flow

Improper handling of detector gas flow and pump flow start and stop can damage the detector. Observe the respective order of steps:

  • To start detector gas flow and pump flow: Turn on the detector gas flow first, wait at least 5 minutes and only then turn on the pump flow.
  • To stop pump flow and detector gas flow: Turn off the pump flow first, wait at least 5 minutes and only then turn off the detector gas flow. During the waiting period, the drain pump drains any remaining mobile phase to waste.

Turning On the Detector Gas Flow

  1. Make sure that you observe the site requirements for the gas supply. See Gas Supply Requirements.

  2. Make sure that the following prerequisites are met:

    • The nebulizer is installed.

    • The components in the gas flow path are properly connected.

    • The protective cover of the gas filter assembly is installed.

  3. Turn on the gas supply to the detector. Observe the Gas specifications for the gas supply pressure. See Performance Specifications.

  4. Turn on the gas flow in the detector using the GAS button on the keypad of the detector or using the chromatography data system.

  5. Close the detector doors.

  6. Wait at least 5 minutes and only then turn on the pump flow, if needed.

Turning Off the Detector Gas Flow

This procedure depends on whether the pump flow is on.

Pump flow is off

Pump flow is on

Turn off the gas flow in the detector using the GAS button on the keypad of the detector or using the chromatography data system.

1. Turn off the pump flow.

2. Wait at least 5 minutes and only then turn off the detector gas flow using the GAS button on the keypad of the detector or using the chromatography data system.