What you need to know about DEF Tank Level Measurement for EPA Tier 4 Diesel Generator Emissions

The EPA Tier 4 emissions standards apply to diesel engines used in mobile generators, as well as other nonroad applications. The standards are designed to reduce emissions of particulate matter (PM) and nitrogen oxides (NOx) from diesel engines.

To meet EPA Tier 4 emissions standards, manufacturers must use advanced emission control technologies, such as diesel particulate filters (DPFs) and selective catalytic reduction (SCR) systems. These technologies work by trapping or reducing the emissions of PM and NOx, respectively.

In order to determine which Tier 4 standards apply to a specific engine, the EPA considers factors such as the engine’s horsepower, intended use, and model year.

It is important for manufacturers and users of diesel generators to be aware of the Tier 4 standards and ensure that their engines are compliant. Failure to meet these standards can result in fines and other penalties.

DEF (diesel exhaust fluid) is a urea-based solution that is used in selective catalytic reduction (SCR) systems to reduce emissions of nitrogen oxides (NOx) from diesel engines.

Level sensors can be used to measure the level of DEF in a generator’s DEF tank and provide an accurate reading to the operator or a control system. This can help prevent DEF starvation, which can damage the SCR system and cause the engine to go into a “limp home” mode.

There are several types of sensors that can be used to measure the level of DEF, including float-type sensors, ultrasonic sensors, capacitive sensors, and radar sensors. These sensors operate in a similar way to the sensors described in my previous answer, but they may have specific design features that make them suitable for use with DEF.

It is important to choose a DEF level sensor that is compatible with the SCR system and able to accurately measure the DEF level over the full range of the tank. The sensor should also be able to withstand the chemical properties of DEF and any temperature or pressure changes that may occur.

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