Instruction Manual - G85
12
The fault occurs because of under pressure in the gas supply when the G85 is not in use.
If the user shuts off the gas supply only on the bottle or the external regulator an under
pressure will develop. The under pressure will draw back liquid from the humidification
bottle through the gas outlet to bottle tube and into the G85 where it will damage the flow
sensor.
If the user remembers to completely close the regulator valve on the side of the G85 no
such problem will occur.
•
Alternatively the exterior 5% CO
2
supply tube should be disconnected from the G85
when the G85 is not in use.
Or:
•
The Gas outlet to bottle tube disconnected when the G85 is not in use.
There is no recommended hardware update at this time, as such an under pressure
cannot be avoided with certain types of gas regulators. We have considered the addition of
a one-way flow valve in the circuit, but test have shown that under unfortunate
circumstances the process can still be triggered.
The only fully safe way to avoid the problem is as described above
.
