![]() ![]() The heating element (6), the temperature sensor (5) and level sensor (4) are housed in the heating pod (3). ![]() The tube’s inlet is located very close to the heating element to ensure that liquid fluid is available as soon as possible in case it was frozen. Inside the tube there are three separate passages, two of them are used to deliver the fluid and one to house the electrical supply wire for the heating element. Depending on the size of the tank, it might take up to 5hrs for the fluid to fully thaw out.ĭEF fluid is delivered to the pump (1) via suction tube (7). With the engine off, the heating element will not engage and the fluid will be allowed to freeze if the ambient temperature is below the fluid’s freezing point. The heating element (6) is used to prevent the fluid from freezing while the engine is running. Below -34☌ (-30☏) the DEF system activation is disabled by the ECM.ĭEF fluid is a urea based product, it freezes at -11☌ (12.2☏). Fluid’s temperature is monitored by the NTC temperature sensor (5). The level sensor only has the capability of reading 0%, 33%, 66% and 100%. The level sensor consists of four electrodes that measure the fluid level through conductivity. The fluid’s level is monitored by the level sensor (4). ![]() The fluid is stored in the plastic storage tank (9). To show you how the tank actually works, we’ve provided an illustration of the tank, breaking down the functions of each component. It is an ammonia-based fluid that is injected into the catalyst and a chemical reaction breaks down the NOx into nitrogen, water and small amounts of CO2. Diesel Exhaust Fluid is an important component in keeping heavy-duty trucks and machinery operating within emission guidelines. ![]()
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