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(c) Copyright July 09

Results of the Tests

1. 1. •The data for the smoldering smoke tests show that typically the
      photoelectric detectors set to 2.5 %/ft responded 12 - 18 minutes earlier than the Type A ion detectors set to 1.3 %/ft.
      Table 2 shows that when both were evaluated at 0.5%/ft, the photoelectric detectors typically responded 25 - 30 minutes faster than the Type A ion detectors.
      As Tables 1 and 2 show,
      in the UL 268 Flammable Liquid Fire tests, there was no significant difference in response time between the photoelectric and Type A ion detectors whether compared at their default sensitivities (2.5 %/ft and 1.3 %/ft) or the same, higher sensitivity (0.5 %/ft).
      

   2. 
      

   3. •Statement in Report:
      “Note that not all ions alarmed in all smoldering tests.”
      

   4. 
      

   5. • According to NIST in 2001

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Slides: 25, 26, 27 and 28:
These slides will show you not all testing demonstrates that the ionization is fast during a flaming fire.  In a conference sponsored by NIST in 2001, a UL test was presented.

The results again show the photoelectric’s were much faster to respond in a smoldering fire, depending on the placement of the detector to the fire, by as much as almost 19 minutes when they were set at the sensitively levels sold to home owners.

Note:

     The Photoelectric in this test also was faster by literally a few seconds than the ionization in the flaming tests as well.

     Remember that sensitively levels can be manipulated by manufacturers.  When the sensitivity levels were set the same, to the most sensitive levels, the Photoelectric was 11 seconds faster than the ionization in the flaming tests but was 30 minutes faster in the smoldering tests.