Preventive and Periodical Maintenance procedures are: Periodical System Run (every 6 months) – starting system and running Limits test for 10 minutes. Calibration check. Thermal Calibration (every six months). System cooling liquid - Dawtherm replacement (if the system is not used for over 6 months) Thermode cooling liquid - Dawtherm replacement (if the thermode is not used for over 6 months) Water replacement/running system with filter with ECU (every 6 months). Ground conductivity test for fMRI systems (after every assembly in fMRi scanner). Pathway and TSA II. Thermode visual test (prior to attaching to subject) and maintenance at Medoc as needed.