Vaporisers Manual leak testing of vaporisers was previously recommended routinely. It should only be performed on basic ‘Boyle’s’ machines and it may be harmful to many modern anaesthetic workstations. Refer to the manufacturer’s recommendation before performing a manual test. Check that the vaporiser(s) for the required volatile agent(s) are fitted correctly to the anaesthetic machine, that any locking mechanism is fully engaged and that the control knobs rotate fully through the full range(s). Ensure that the vaporiser is not tilted. Turn off the vaporisers