Anesthesia Flowmeter Test and Repair
The needle valve is used to adjust the flow of oxygen into the machine. Turning the green knob clockwise closes the valve. Turning it counterclockwise opens it.
The ball in the graduated glass tube indicates the current rate of flow. Readings should be taken based on the position of the center of the ball.
The oxygen connection on the back of the flow meter uses a DISS (Diameter Indexed Safety System) fitting. This means that no standard gas fitting other than oxygen should be able to physically connect to the back of the flowmeter.
The color of the knob and the hose from the oxygen tank match the standard color code for oxygen. This is green for units sold in the USA.
To Test Flowmeter Functionality
Never overtighten the flowmeter needle valves. This will eventually result in damage to the needle and seat.
With 50-55 PSI (3.4-3.8 Bar) oxygen supplied to machine, and the APL valve fully opened, rotate flowmeter needle valve knob and verify a smooth movement of flowmeter ball though full range of settings.
