There are two principal reasons why a data logger integrated into the fridge pack might not be acceptable.
Firstly the European Norm for temperature recorders requires that the measurement system used should be independent of the fridge control system. This is to ensure that any errors in the measuring system that could affect control accuracy are not duplicated in the monitoring process.
Secondly, most integral data loggers have been designed with the fridge engineer in mind and generally record copious information that most vehicle users don’t need, probably can’t understand and which can only be accessed with a laptop with specialised software.
It’s much easier and convenient to press the TranScan print button and obtain a Delivery or Journey Ticket printout.