Speaking of which, have you been fortunate to come across the new Graseby Omnifuse 4100?
I know they have designed these pumps to be more tamper proof and user friendly.
I have disscovered however, on evaluation that the plunger sensor looks very appealing to stray fingers when the lockable cover is open.
It seems that Graseby have moved away from the old fashioned mechanical, user operated Syringe Plunger clamp, and opted for an automated one.
Everytime some interferes with it the pump shuts down and shows up an error message.
Admittedly it is reset fairly simply, but this leads to all sorts of questions being raised, of which I will not go into.
Chris-H