2.In the case of a batch pressure system:U.K.
(a)
the temperature must be monitored with a permanent thermocouple and it must be plotted against real time;
(b)
the pressure stage must be monitored with a permanent pressure gauge; pressure must be plotted against real time;
(c)
the processing time must be shown by time/temperature and time/pressure diagrams.
At least once a year the thermocouple and the pressure gauge must be calibrated.