Four Tube Flowmeter

FUNCTION

• The Flow Head incorporates the lollowing lunctions :
• Gas indexed pneumatic inlet ports
• N20 gas flow out off in the event of oxygen failure
• Flow control needle valves
• N20/O2 flow ratio hypoxic mixture prevention proportioning system
• Color coded, marked specific labels for flow tubes and flow control valves
• Gas mixing chamber, mixed gas outlet

GENERAL OPERATION

The Flow Head integrates 02 and N20 (the N20 is optional).

The O2 Air and N20 needle valves gas supply pressure is externally regulated to 400Kpa¢10Kpa as per standard.

The N20 channel incorporates a pressure cut-off valve. The O2 supply pressure in the circuit controls the output pressure of the pressure out-oft valve. Under all conditions of operation, the N20 flow shall reach zero before the O2 flow. ln this flow head the N20 pressure switch shall cut oft the flow of N20 before the O2 pressure drops below 50115Kpa.