The ONLY way to validate the blast freezer is to collect reams and reams of data. You do not need an expert you can and should do this yourself. You can purchase wireless data loggers and/or multiple thermometers for way less than a consultant will charge you for this study.
Begin day one with a probe in top/middle and bottom layer as close to the middle as you can..............continue to monitor until product has reached the temperature you require/are mandated to be at. Repeat this for EACH cart that goes into the blast while recording WHERE and WHEN each cart went. Now, in order to be statistically sound, you will also need the temperatures of the same three locations/cart PRIOR to going into the blast.
You should already have enough data from your chilling records to know approximately how long your product needs to cool, and that will dictate how much time this will take.
I performed my validation study over the course of one week. The put a grid on the floor so I knew where each cart needed to go by each day. The other portion of the validation will be the actual blast freezer temperatures, again, a data logger is required.
DO not make this process more complex than it is, you just the need time to complete
I hope this helps
Edited by Charles.C, 04 March 2017 - 05:21 AM.
moved to this current thread ex 24400