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How does a DEF sensor work?

2025-12-31

A DEF sensor works by monitoring the level and concentration of Diesel Exhaust Fluid (DEF) in a vehicle's exhaust system to ensure the proper functioning of the Selective Catalytic Reduction (SCR) system, which reduces harmful emissions. Here's how it works:

1. ‌Core Functions‌

‌Level Monitoring‌: It continuously measures the DEF level in the storage tank. When the level drops below a certain threshold, it triggers an alert.
‌Concentration Detection‌: Using sensors that measure electrical conductivity or refractive index, it checks the urea concentration in DEF to ensure it meets the standard (typically 32.5%).

2. ‌Working Process‌

‌Signal Acquisition‌: The sensor converts the level and concentration data into electrical signals.
‌Data Processing‌: These signals are amplified and filtered before being sent to the vehicle's Electronic Control Unit (ECU).
‌Feedback Control‌: The ECU uses this data to adjust the SCR system's operation. If DEF is insufficient, it may limit engine power.

3. ‌Technical Features‌

‌High Precision‌: It employs temperature compensation to maintain accuracy even in extreme conditions.
‌Interference Resistance‌: Shielding design minimizes electromagnetic interference, ensuring stable signals.

4. ‌Applications‌

‌Commercial Vehicles‌: Such as trucks and buses, used to meet emission standards like Euro VI.
‌Construction Machinery‌: Like excavators and loaders, ensuring the efficient operation of exhaust treatment systems.

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Company news about-How does a DEF sensor work?

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How does a DEF sensor work?

2025-12-31

1. ‌Core Functions‌

‌Level Monitoring‌: It continuously measures the DEF level in the storage tank. When the level drops below a certain threshold, it triggers an alert.
‌Concentration Detection‌: Using sensors that measure electrical conductivity or refractive index, it checks the urea concentration in DEF to ensure it meets the standard (typically 32.5%).

2. ‌Working Process‌

‌Signal Acquisition‌: The sensor converts the level and concentration data into electrical signals.
‌Data Processing‌: These signals are amplified and filtered before being sent to the vehicle's Electronic Control Unit (ECU).
‌Feedback Control‌: The ECU uses this data to adjust the SCR system's operation. If DEF is insufficient, it may limit engine power.

3. ‌Technical Features‌

‌High Precision‌: It employs temperature compensation to maintain accuracy even in extreme conditions.
‌Interference Resistance‌: Shielding design minimizes electromagnetic interference, ensuring stable signals.

4. ‌Applications‌

‌Commercial Vehicles‌: Such as trucks and buses, used to meet emission standards like Euro VI.
‌Construction Machinery‌: Like excavators and loaders, ensuring the efficient operation of exhaust treatment systems.

Engine NOx Sensor

Car NOx Sensor

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Truck Blower Motor

Urea Doser Pump

DEF Sensor

PM Sensor

Truck ABS Sensor

Exhaust Temperature Sensor

Crankshaft Position Sensor

Truck Pressure Sensor

Power Window Switch

VGT turbo actuator

Engine NOx Sensor

Car NOx Sensor

Nitrogen Oxide NOx Sensor

Truck Blower Motor

Urea Doser Pump

DEF Sensor

PM Sensor

Truck ABS Sensor

Exhaust Temperature Sensor

Crankshaft Position Sensor

Truck Pressure Sensor

Power Window Switch

VGT turbo actuator

News Details

Company news about How does a DEF sensor work?

News

Cases

How does a DEF sensor work?

1. ‌Core Functions‌

2. ‌Working Process‌

3. ‌Technical Features‌

4. ‌Applications‌

Company news about-How does a DEF sensor work?

News

Cases

How does a DEF sensor work?

1. ‌Core Functions‌

2. ‌Working Process‌

3. ‌Technical Features‌

4. ‌Applications‌