The filter integrity test (FIT) checks the integrity of the sterile filter at regular intervals. The steam-sterilisable freeze dryers from Christ have fully automatic filter testing already integrated in the automation system. The water necessary for the filter test is generated in the unit from sterile steam, and the test results are documented by the LPCplus process control system.
The standard version is equipped with a sterile filter, and on customer request a second sterile filter can be fitted in series. This does not affect the fully automatic filter test process.