Yes Geoff I have one of these old Ohemda test lungs, I use to use it testing the Anaesthetic machines, but I cant hold the negative draw long enough to get a viable reading. on the inspiratory valve.
Daniel, because like everyone else in the NHS funds are not available I was looking for a cheaper option than using the £800 drager service tool.
VitaPablo you seemed to have grasped the problem exactly how I see it ..
The solution we found by using a wall mounted vacuum low suction set at a negative draw of 12mmHg. this is the same figure as generated off a dedicated borrowed venturri. ( when a flow between 60-65 litres used.)Solved by my trusty apprentice!
The trainer did state at the time I was trained, that a vacuum controller, could be used but they do not have that facility themselves; and one forgets.
thanks to all for your inputs
