Facility 233:  4' X 4' Temperature/Humidity 

 

Description: This facility is a medium-sized chamber used for thermal and humidity cycling of medium-sized test items. A full-opening, hinged front door with a window allows for access and viewing.

 

Mode of Operation: The test item is installed in the chamber and connected to an external power source and data acquisition equipment via an access port. After ambient functional checks are completed, electrical heaters warm, and a cascade refrigeration system cools the air stream. The preferred procedure is to operate the chamber with a hot cycle before decreasing the temperature below 4°C (39°F). A dry-air and dry nitrogen purge system regulates humidity in the chamber to prevent frost build-up on the test item. Two integral gloves are provided in the front door of the chamber for “glove box” type testing of mechanisms, etc.

 

Parameters:

Temperature range:                   -70°C to +150°C (-94°F to +302°F)

Humidity range (RH):                15% to 95% between 185°F max and 39°F min

                                                      <5% with nitrogen purge

Heating capacity:                        18 kW

Cooling capacity:                         22 kW

Max P/L weight:                           90 kg (200 lbs)

 

Physical Characteristics:

Test volume:                              1.22 m W x 1.22 m H x 1.22 m L (4’ x 4’ x 4’)

Viewport size:                            61 cm x 61 cm (24” x 24”)

Access port size:                        15.2 cm inside diameter (6”)

 

 

Integral Instrumentation: Temperature and humidity are controlled by a digital programmer/controller located on the side of the chamber. Eighteen thermocouples are available for payload monitoring.

 

Rental Rate:  Inquire