Sensor HD-PTZx35, Operation Manual

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3. Apply no more than 10psi (.7bar) of dry, inert gas, or
instrument air to purge valve.
Note: Make sure the air source does not have added oil or any
other additives (such as are present in air used to pressurize
paintball guns).
4. Allow gas to flow for 30 seconds.
5. Replace seal screw and tighten.
6. Optionally, you may reapply the pressurized air up to 10psi
(.7bar) to maintain internal pressure against any ingress.
7. Replace purge valve cap until just seated, hand-tight only.