Thermocouple Locations

There is no information in GDP guideline as to location of or how many thermo couplings for temperature measurement should be inserted into the load space during the qualification test. Air and load temperature measurements are made with thermo-sensors of type Pt 100. Accuracy is within limits ± 0.3 °C. Thermo-sensors are calibrated based on procedure of Czech Metrologic Institute. Sensors were placed according to FDX 15-140. Temperature data is measured and recorded by equipment independent of the refrigeration unit. Placement of the thermo-sensors (thermocouples) for individual compartment is shown in figure below. All sensors except sensors mounted at front solid return air bulkhead and rear doors are located 15 cm from the relevant walls, ceiling or floor. Those exceptional two sensors are placed 5 cm from the relevant surface.

Thermocouples Ti1 to Ti4, Ti16 to Ti19, Ti21 to Ti24 and Ti9 to Ti12 are located 150mm away from any wall/door.

Thermocouples Ti13, Ti20, Ti25 and Ti15 are located in the centre.