Reporter has experienced two like scope washing machines changing their chemical immersion time, detergent name, and disinfectant chemical name control parameters, apparently without user input.
These control parameters, are independently set and stored for each of the three instrument bays on each machine.
On further investigation reporter has verified, and can readily duplicate what is apparently a software flaw in the custom ultrasonics software.
The identified problem manifests itself by setting the detergent name, disinfectant chemical name, chemical immersion time and perhaps other control parameters for a given scope processing bay to the values contained in the last printed historical record for that processing bay after having reviewed and printed that record on the screen.
The change to the chemical immersion time happens regardless of whether or not it violates the minimum disinfectant time set for that processing bay.
For example, reporter has observed and can duplicate the preset chemical immersion time changing from 20 minutes to 1 minute despite the minimum chemical immersion time being set at 20 minutes.
The minimum disinfect time is a failsafe setting that is intended to prevent the operator from selecting an unsafe chemical immersion time and this setting can not be changed by the operator.
The chemical immersion time is a user adjustable time that is intended to allow them to extend the chemical immersion time beyond the set minimum time but never below the minimum disinfect time setting.
This problem has been reported to, and demonstrated for the manufacturer's service and sales representatives on three separate machines with two different software revisions.