Stray Light Voltage Frequently Asked Questions (FAQs)

• If the instrument fails only the Stray Light Voltage test, should the other parameters (Volumetric Flow Meter, ONDINA concentration, PAO concentration, and HIGH concentration) be assessed for risk if used before calibration?
  The Stray Light Voltage indicates chamber cleanliness and does not have a pass/fail outcome. However, if the unit becomes very unstable in the Clear sample mode on the 2i and re-zeroing does not resolve the problem, there may be a risk. It is advisable to assess the stability of the unit before use.
  
  
• Is there a direct effect of Stray Light Voltage on the Volumetric Flow Meter, ONDINA concentration, PAO concentration, and HIGH concentration tests?
  The Stray Light Voltage does not affect the Volumetric Flow Meter, ONDINA concentration, PAO concentration, and HIGH concentration tests. The Stray Light Voltage affects the % Leakage stability of the unit when reading low concentrations and may cause instability in readings if the chamber is not cleaned.
  
  
• Will the Stray Light Voltage affect normal downstream verification operations?
  The Stray Light Voltage impacts the stability of the unit when measuring low concentrations. It does not affect normal downstream verification operations but may cause instability if the chamber is not cleaned.
  
  
• What does it mean if Stray Light Voltage has "As-Found" and "As-Left" results? What are the allowable limits for this test?
  The Stray Light Voltage measurement indicates the cleanliness of the chamber. The allowable range for Stray Light Voltage is between 0.000500 and 0.000050. If the "As-Found" result fails (is out of the acceptable range), it suggests the chamber was not clean at the time of measurement.