Model SEI 33FT is a high quality Temperature and
Humidity Stability Chamber, built to exceed the exacting standards
required for Filiform Corrosion Testing, following the NAS 1534, EN3665
and GM9682P test methods. The key to successful testing is to reach and
accurately maintain the required parameters during the entire test time.
The Filiform Test Stability Chamber is constructed from 316 Stainless
Steel inside, with the exterior 304 Stainless Steel surface painted as extra protection. The
interior is unpainted allowing easy cleaning and resistance to corrosion
from the aggressive atmosphere produced during the test. Each unit is supplied with
4 solid stainless steel shelves which locate into 4 pilasters, and these
serve to hold the shelves rigid and bear the load of the samples being
tested. There are 19 available shelf positions to allow high density
testing if required. The chamber is vented at the top to allow vapors to
escape to the outside or into a fume hood.
A microprocessor based PID controller allows extremely
accurate temperature performance and ensures that the chamber performs
well within the specified test limits. The controller also has user
settable over- and under- temperature limits and audible/visual alarm
systems which alert the user to events such as power interruptions.
The key to uniformity in any Chamber is the StabilityPLUS™
which ensures all parts of the chamber are constantly supplied with
conditioned air at the correct temperature and humidity. The StabilityPLUS™
design ensures there are no hot or
cold spots anywhere in the chamber and the gentle nature of the airflow
ensures that any samples are not subject to
painted samples are placed in a corrosion chamber which has been
saturated with acidified salt solution for 1-6 hours. Samples are
removed from the acidic atmosphere and placed in the environmental
chamber that is set to a specific temperature and humidity. Precise
environmental control is important, since temperature and humidity play
major roles in filiform propagation. The Filiform Test Chamber constantly measures and
maintains this condition. Standard exposure time in the
environmental chamber is 1000 hours or as specified.