Kavlico releases urea-dosing pressure sensor
A
Kavlico product story
Edited by the Engineeringtalk editorial team
Sep 26, 2008
Kavlico has developed a sensor for urea-air dosing, utilising (AUS32) aqueous urea solution 32.5 per cent or Adblue in selective catalytic reduction (SCR) after-treatment systems with diesel engines.
The (AUS32) solution is a high purity urea in de-mineralised water that is clear, non-toxic and safe to handle.
Kavlico's urea-dosing sensor generates an output used to provide feedback to the SCR system to assist in reducing nitrogen oxide emissions by monitoring the SCR system and helping to determine the appropriate amount of Adblue reducing agent to be delivered to the catalytic converter module.
Adblue is carried on-board SCR-equipped trucks and buses in specially designed tanks and is dosed into the SCR system at a rate equivalent to 3-5 per cent of diesel consumption.
The low dosing rate ensures long refill periods and minimises the tank's impact on chassis space.
Currently used throughout Europe, Japan, Australia, Hong Kong, Taiwan, Korea, New Zealand, and Singapore in on-highway SCR systems, urea dosing will also become prevalent in the US because of legislative limits placed upon nitrogen oxide emissions.
Kavlico's urea-dosing pressure sensor utilises a ceramic capacitive sense element for pressure ranges up to 25 bar and a thin film (Tion) sense element for pressure ranges of more than 25 bar.
The sensor is packaged in a durable, all-stainless steel housing.
Requiring a 5V DC power supply, the sensor provides a 0.5 to 4.5V DC linear amplified analogue output proportional to pressure.
Other features of this accurate and rugged sensor include the ability to: operate in high vibration environments, withstand high overpressures and operate over a temperature range of -40 to +130C.
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