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  1. Bleed the plastic tube before connecting it to the purity meter.
  2. Adjust the gas flow in the plastic tube to be low, before connecting it to the purity meter.
  3. Ensure the purity meter is ON and PRIMARY and SECONDRY gas-types are properly selected (if not, see above).
  4. Connect the plastic tube to the purity meter inlet while a low flow of gas in presencepresent.