Atmosphere Monitoring Subsystem
This system uses the Relative Dimensional Stabilizers to control the type and amount of atmosphere pumped into a TARDIS. The Subsystem has an automatic-cleaning device so used air is recycled, purified, and reclaimed by the Automatic Oxygen Supply System. A dial on the console acts as a barometer and thermometer.
It automatically adjusts the internal temperature and humidity for the comfort of the crew. Despite this, humans often find the internal atmosphere somewhat drier than what they are used to. Trakenites, on the other hand find it uncomfortably warm and humid. If a TARDIS lands on a habitable planet it will draw air from the outside and filter it. The air is kept antiseptically clean, though some complain about the high levels of static electricity.
If the interior hum is ever deactivated, then the life support system can be faintly heard. It sounds like very slow breathing. Individual rooms can have the air evacuated. An alarm will sound if the life-support systems are about to fail. For such occasions there is a portable Emergency Unit with enough air for six hours. In the Mark X upgrades, emergency life-support masks will drop down in the control room for each crew member.
The TARDIS's circuitry (especially the Protyon Core) is vulnerable to high temperatures (over 40 degrees Celsius). The exo-shell is equipped with coolant systems run by the thermal protection circuits. But when the internal environment's temperature rises beyond a TARDIS's engineering tolerances, then the thermal cut-out will switch in and disable all automatic controls. The thermal cut-out will deactivate when the thermal protection circuits have returned the TARDIS to a safe temperature (this usually takes a few hours). This cooling time can be reduced by venting the Thermo-Buffer, which will return interior of a TARDIS to normal temperature in much less then an hour. If exposed to freezing conditions for too long (say if the main doors are left open) the thermo-couplings might become chilled. This can result in a rocky dematerialization. For this reason it is important to keep the main doors closed if the exterior environment is sub zero.
The following color code is used:
- Black: For information from the TV Series, including Dimensions in Time, and 1996 TV Movie.
- Blue: For information from the Novels and Audios including Target, Virgin, BCC, and Big Finish.
- Green: For information from 'licensed' reference sources such as the Technical Manual, Doctor Who Magazine, and the Role Playing Games.
- Red: For information from unofficial sources -The Faction Paradox series, behind the scenes interviews, author's speculation, and popular fan belief.
The TARDIS Technical Index is copyright Will B Swift.