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SCR system (auto urea bag) special pressure sensor CS-PT1376

At present, China's fog and haze is increasing every day, and motor vehicle emissions have become an important source of pollution. In the motor vehicle, the most serious pollution is from diesel vehicles. In our country the development of diesel cars started late, and the importance gasoline despise diesel light" development policy make diesel engine technology be in a backward state for a long time, some old diesel car fuel consumption is high, noise big, black smoke rolling.

Aiming at this situation, After nearly four years of research and development, testing and experimentation, Xi'an Chinastar M&C LTD launched a special pressure sensor CS-PT1376 for diesel engine exhaust processing device (SCR), Main Diesel exhaust emissions is NOX, after dealing with the SCR system it become N2 and water vapor, in line with the European V that the country V standards, significantly improve the quality of the environment.

From the anti vibration, corrosion resistance, urea icing is not damaged, such as the requirements CS-PT1376 pressure sensor complete match SCR system. At present, Xi'an Chinastar M&C LTD has applied for national patent for CS-PT1376 pressure sensor.

Technical parameters

Measure range

0~1Mpa

Accuracy

±1.0%F.S

Power Supply

5VDC±0.25V

Output Signal

0.5~4.5VDC

Operate Temperature

-7~85℃

Stock Temperature

-40~100℃

Overload Pressure

200% RP

Response Time

≤10ms

Load  Resistance

≥100MΩ@50V

Elec. Connect

Direct

Interface and shell material

stainless steel

Stability

±0.5%/F.S/Year

Shell Protection

IP65

 

 

              cs-pt1376

 

 

 

 

Application

SCR system and urea injection

1.SCR: selective catalytic reduction

2.Urea solution inject into tail gas emission system

3.NOX emissions decreased by more than 80%

4.Urea injection pressure sensor pressure range of 10Ba

汽车尿素包SRC系统原理图

SCR syste

尿素喷射系统

Urea injection

 

Urea solution for vehicle

1 Conform to DIN 70070

2, 32.5% urea solution

3, urea

4, the temperature dropped to -11 degrees Celsius below the solution will freeze

5, the volume will be expanded after the freeze about 10%

6, urea solution will be decomposed at 80~120

7, the solution in the drying process will appear urea crystallization

The challenge of SCR system for pressure sensors

1, the frequent vibration requirements of the product from automotive industry.

2, the corrosion of urea solution

32.5% urea solution (Ad Blue) is alkaline, pH value is about 10 so there is a high demand to the sensor housing and sealing the original corrosion resistance.

3, urea solution freezing problem

The urea solution can be frozen at -11, and the volume expansion is about 10%. If urea is residual sensor internal under low temperature, it will be freezing and cause generating huge pressure (up to tens of MPA in the internal sensors), resulting in the destruction of the structure of the sensor and sensor.

压力传感器的使用

Verification test

1、vibration test

频率(HZ)

振幅(mm)

加速度(m/s2)

扫描频率(oce/min)

每一方向试验时间(h)

10~25

1.2

 

1

8

25~500

10

100

1

8

试验结果:振动完成后,产品完全完好。

2, corrosion resistance test

The sealing material of stainless steel shell and high alkali environment3, freezing cycle test

Test condition:

The sensor is full of AdBLUE under vacuum

Test temperature: -40/85 degrees C; cycle times: 100X

Test results: OK


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