High Temperature Exhaust Gas Treatment Differential Pressure Sensor

Number

Test Item

Test Conditions

Performance Requirements

1

Overload pressure

Overload pressure :300kPa(g)

Pressure time: 5min

Test temperature: 20-25℃

 After the sensor is restored to normal operation, it complies with the characteristics.

2

Destruction pressure

Burst pressure :450kPa(g)

Pressure time: 1min

Test temperature: 20-25℃

 When the sensor is subjected to the failure pressure, the sensor is not required to be able to return to the normal working state, but the sensor cannot be damaged and leaked under the failure pressure.

3

Pressure temperature cycle

he temperature cycle is -40℃~135℃

The pressure cycle is -1.7~34.5kPa

Hold for 84h and maintain for 0.5 hours at each pressure limit point and temperature point

All sensors should meet the accuracy requirements after testing and there should be no leakage.

4

Low temperature storage

Test temperature: -40 ℃

Test time: 72 hours

 All sensors should meet the accuracy requirements after testing and there should be no leakage.

5

High temperature storage

Test temperature: 135 ℃

Test time: 72 hours

All sensors should meet the accuracy requirements after testing and there should be no leakage.

6

Thermal Shock

 Low temperature: -40 ℃

High temperature: 135 ℃

Cycle count: 500 Cycles

Holding time for each temperature point: 1 hour

The sensor is not powered on during the experiment.

All sensors should meet the accuracy requirements after testing and there should be no leakage.

7

Temperature and humidity cycle

The humidity chamber with the initial temperature of +23℃ and the initial humidity of HR83% was heated to +40℃ within 5h, and the humidity was raised to HR92%, and kept for 12h; After 5h, the temperature was lowered to +23℃, and the humidity was HR83% for 2h. The above process was repeated 21 times for 504h. The sensor is not powered up during the experiment.

All sensors should meet the accuracy requirements after testing and there should be no leakage.

8

Durability test

 Pressure cycle at high temperature 110 +/-5℃ : from -1.7kPa to 34.5kPa, frequency is 0.5Hz; The number of cycles is 2 million. The sensor is not powered up during the experiment.

All sensors should meet the accuracy requirements after testing and there should be no leakage.

9

Fluid compatibility test

The sensor is connected to an electrical harness and a 5V power supply is applied. The four reagents in the figure below are tested separately. Test method: Drop 5-10 drops of reagent onto the pressure interface of the sensor as shown in the following figure

(The air inlet direction is upward), and then the sensor is placed in a temperature box at 100 ° C for 2 hours. After rinsing, repeat the test with the other three reagents.

number  Type   experiment quantity   

1       diesel         5 drops

2     Engine oil        10 drops

3      gasoline        10 drops

4        glycol        10 drops

All sensors should meet the accuracy requirements after testing