For the after liquid nitrogen filling cans, PET bottles of internal pressure real-time monitoring, And other gas beverage after filling testing pressure. Can quickly detect and eliminate the unqualified products and provide sound and light alarm. Users can monitor whether the front-end equipment normal operation, reject to unqualified products flow to the adverse impact on the market, When consecutive unqualified products is to eliminate the front-end equipment problems can be found timely warning, can be set automatically stop the front-end equipment function, reduce the loss, Also cooperate with this detector can be more convenient debug user filling quantity of liquid nitrogen machine, don't have to destroy tanks whether internal pressure compliance.