Analyzer shows unstable helium value or no measurement
Incorrect flow limiter settings in either the Simple or Professional Flow Limiter can primarily affect helium readings, resulting in unstable values or no measurement at all. Oxygen readings may also be affected, especially when measuring pure oxygen.
Possible causes
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Damaged flow limiter
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Incorrect flow rate setting
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Damaged or failing helium sensor assembly
What to try
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Check the flow rate using a flowmeter. If a flowmeter is not available, connect a hose and place the end into a glass of water. You should see a steady stream of bubbles, not a strong or turbulent flow. The correct flow rate should be approximately 0.2–0.5 L/min.
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For a Basic Flow Limiter, adjust the flow by turning the nozzle.
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A Professional Flow Limiter cannot be adjusted. It can only be fully opened or closed to release residual pressure.
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Inspect the flow limiter for visible damage or unauthorized modifications.
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Ensure steady and continuous gas flow during measurement.
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If the helium value remains unstable even after disconnecting the tubing between the flow limiter and the analyzer, further helium sensor assembly diagnostics may be required. Refer to the "Internal Values" article or perform the recalibration procedure.
When to contact service
If the flow cannot be properly regulated, or if the helium value remains unstable after performing the steps above, please contact an authorized Divesoft Service Point.
You can find your nearest authorized service location on our Service Centers page.