×

Multiple-blower relative humidity controlled test chamber

  • US 6,892,591 B2
  • Filed: 09/17/2001
  • Issued: 05/17/2005
  • Est. Priority Date: 09/15/2000
  • Status: Expired due to Term
First Claim
Patent Images

1. In an accelerated weathering apparatus having a test chamber, a specimen support, a light source powered by a power source controlled by a ballast, a pair of chamber air temperature sensors disposed before and after the test chamber, a black panel temperature sensor, an air heater, and a dual blower system for drawing and circulating fresh and recirculated air, said dual blower system including a fresh air blower and a recirculation air blower, a method for controlling both air and black panel temperatures within the test chamber, said method comprising:

  • (a) selecting a desired irradiance;

    (b) selecting a desired chamber air temperature and a desired black panel temperature;

    (c) sensing the chamber air temperature;

    (d) sensing the black panel temperature within the test chamber;

    (e) comparing the sensed chamber air temperature the selected chamber air temperature;

    (f) comparing the sensed black panel temperature to the selected black panel temperature; and

    (g) in response to comparing steps (e) and (f), adjusting a speed of at least one of the fresh air blower and the recirculation air blower.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×