Air bag demands no problem for pressure sensors
A
Gems Sensors product story
Edited by the Engineeringtalk editorial team
Jun 26, 2000
Air bag inflation manufacturers require dependable and stable pressure sensors to perform critical ongoing tests, making Gems Sensors' CVD 2000 or 4000 Series the ideal solution.
Air bag inflation manufacturers require dependable and stable pressure sensors to perform critical ongoing tests, making Gems Sensors' CVD 2000 or 4000 Series the ideal solution.
Stability is a key application factor.
Therefore, a CVD or sputtered type sensor will perform extremely well.
An air bag inflation system is an all-welded, hermetically sealed, 4000 psig canister of air and hydrogen, which is quickly deployed during a crash.
Testing these systems requires modifying the canisters with a special tap for the transducer and detonating the system.
Regulations stipulate that 1% of all inflation systems must be checked.
The test consists of measuring the trapped air/hydrogen mixture for 4 hours over -40C to 90C conditions, to ensure that the canisters do not leak, and then exploding the system to confirm the resulting pressure (typically between 5000 and 10,000 psig).
If gas mixtures are not correct, high readings of 15,000 psig can be obtained.
Alternative suppliers' products can often sustain a zero shift, which means that after several tests the sensor would need to be replaced.
But Gems' CVD2000 Series currently provides the ideal solution, due to its overpressure (proof pressure), temperature, and stability specifications.
Gems' proven thin film sensor is atomically bonded onto metal substrate - eliminating drift whilst offering enhanced sensitivity.
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