3ETs11-2

There are a total of fifteen TD-1 thermal sensors installed inside the tank, strategically placed in the engine compartment and crew compartment to cover the areas where the risk of a fire was statistically highest. The fire fighting system reacts regionally when a temperature difference of at least 150°C is detected in the crew compartment or engine compartment. Once a fire is detected by any one of the fifteen TD-1 sensors, the maximum response time of the system is 50 milliseconds.

The TD-1 thermal sensor consists of fifteen thermocouples wired in series. The reaction time of the TD-1 sensor does not exceed 10 seconds, meaning that it takes a maximum of 10 seconds between detecting the fire to the activation of the fire extinguishing system. The sensors do not guarantee reliable detection of fires in the 60°C to 150°C range of temperature differences due to insufficient contrast.

The driver can manually activate the fire extinguishers wired to the automatic firefighting system from a control panel to his right.There is also an additional OU-2 handheld fire extinguisher next to the driver's left foot. The OU-2 is an ordinary carbon dioxide fire extinguisher with a 2.68 liter capacity.

A TD-1 thermal sensor is shown below.



The photo below shows a T-72A tank. Notice the large number of TD-1 sensors placed on the walls and around the floor. Note that the sensors are all concentrated near potential fire hazards; the conformal fuel tanks, loose ammunition stowage positions, and the powerful amplidyne amplifier for the turret traverse motor. There are five TD-1 sensors placed next to the rear conformal fuel tank alone.





The P11-5 control and information panel is part of the firefighting system. The panel has seven indicator lights. The three lights on the top row (3, 5, 6) are to inform the driver of the serviceability of the pyrotechnic fire extinguisher quick release valves, the light on the center left (2) indicates the presence of a fire in the fighting compartment, the light on the center (4) indicates the presence of a fire in the engine compartment, the light on the center right (7) indicates the status of the air filtration system, and the light at the bottom center (12) indicates if the OPVT mode is activated. By referring to indicator lights (2) and (4), the driver can manually discharge the fire extinguishers for either the fighting compartment or the engine compartment by pressing the buttons (1) and (15), which are located behind a hinged metal cover.




The panel is partially visible at the very top of the photo below (from Prime Portal, credit to Marek Solar).




Like most firefighting systems for armoured vehicles, the 3ETs11-2 system uses a halon fire extinguishing agent. Halon 2402 gas is used, also known as Freon 114B2. There are three fire extinguisher bottles available, allowing three attempts to extinguish a fire.




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