What are the components of a DEF system?

What are the components of a DEF system?

There are three major components in any SCR system. These include a DEF supply module or injector, a DEF tank assembly, and an SCR catalyst.

What are the contents of DEF?

Diesel Exhaust Fluid (DEF) is a non-hazardous solution, which is 32.5% urea and 67.5% de-ionized water. DEF is sprayed into the exhaust stream of diesel vehicles to break down dangerous NOx emissions into harmless nitrogen and water.

How a DEF system works?

Small quantities of diesel exhaust fluid (DEF) are injected into the exhaust upstream of a catalyst, where it vaporizes and decomposes to form ammonia and carbon dioxide. The ammonia (NH3) is the desired product which in conjunction to the SCR catalyst, converts the NOx to harmless nitrogen (N2) and water (H2O).

Where is the DEF sensor located?

A DEF quality sensor is mounted on the side of the DEF tank. This sensor detects the Urea concentration in the DEF to confirm it is acceptable for effective dosing (approximately 32.5% Urea).

How do you diagnose a DEF system?

Field Testing

  1. Visually inspect DEF for color and clarity.
  2. Do a “smell test”.
  3. Inspect exhaust piping and DEF injectors for presence of crystallization.
  4. Use a handheld DEF refractometer to measure the concentration specifications of the fluid to ensure 32.5% of the fluid is urea.

Is Blue def cow urine?

Contrary to popular myth, cow and bat urine and DEF are not a thing. The urea used in the manufacture of DEF is synthetically derived from ammonia and carbon dioxide, and urea production plants are often adjacent to other sites where ammonia is produced, such as coal and natural gas refineries.

What causes DEF system failure?

Dirt / Metal Contamination: Contaminated DEF can cause abrasion of the DEF pump. Dirt, rust or tank scale can occur with improper of DEF storage or handling (e.g. res-using disposable DEF containers). UREA Concentration (Dilution): Diluted DEF (too much water) reduces its NOx neutralization effectiveness.

How many sensors does a DEF system have?

3 sensors
First, Diesel Engine Fluid (DEF) sensors are 3 sensors put into 1 apparatus. The DEF level, quality, and temperature are all read via the DEF sensor. For most tractors they are also the source for derate messages these days.

What is system component in operating system?

A system component is a process, program, utility, or another part of a computer’s operating system that helps to manage different areas of the computer. While similar to a computer program, a system component is not something an end-user directly interacts with when using a computer.

What is the composition of def def?

DEF is 32.5% urea, or aqueous ammonia solution, and 67.5% deionized water. The fluid is sprayed and then spread into the exhaust gas via a mixer before entering the SCR catalyst. As DEF enters the SCR catalyst, it evaporates into ammonia (NH3) and water (H20).

What is the difference between a system component and program?

While similar to a computer program, a system component is not something an end-user directly interacts with when using a computer. There are multiple system components at work in a computer operating system, each serving a specific function.

What is a quality sensor on a DEF tank?

DEF Quality Sensor All of KUS’ DEF sending units are designed to work with our Ultrasonic Quality Sensor, which accurately monitors DEF concentration and quality. The quality sensor alerts the user if the solution deviates from the acceptable concentration range or if there are any contaminants present in the DEF tank.