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The air purge jacket is used to keep dust, moisture, airborne particles,and vapors away from the sensing head. Clean, oil free air is recommended. The air purge jacket withstands ambient temperatures up to 180°C (356°F) and can only limited used for cooling purposes. The recommended air flow rate is 30 to 60 l / min (0.5 to 1 cfm). The max. pressure is 5 bar.