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PGA400-Q1: Could you tell me pressure sensing solution for hydrogen gas with 70MPa?

Yoshiki Ochi
Expert 7985 points
Part Number: PGA400-Q1
Other Parts Discussed in Thread: PGA300, PGA302

Hi team, 

Could you tell me pressure sensor for hydrogen gas with 70MPa? 

I found PGA400-Q1 is good pressure measurement method, but I'm lack of pressure sensing solution. Please let me make sure that is correct or not.
It is for detecting pressure in the fuel tank for safety.

In addition, Could you give me some basic technical documents for pressure sensing?  I would like to know which parameters are important to decide pressure sensing solution. 

Best regards,
Ochi

  • 0
    TI__Mastermind 31655 points

    Hello Ochi,

    Depending on the needs of your application, you may be better suited with a different device. Do you already have a pressure sensing element selected? The output range of your sensor as well as the excitation requirements will determine which device is best for you, as well as the output method of your system. Will you need to output 4-20mA current or a voltage output? Is Q1 automotive certification a requirement?

    I'm linking a TI design using the PGA300, which is simpler and less expensive pressure sensing IC. It includes some general information about pressure sensing applications. http://www.ti.com/lit/ug/tiduae1/tiduae1.pdf

    Regards,

     

  • 0 in reply to Scott Cummins
    TI__Expert 7985 points

    Hi Scott, 

    I have not decided yet. Now I only consider which solution would be suitable for fuel tank pressure sensing for fuel cell vehicle in general.

    The target device spec is shown below. 

    • For automotive: Q-100
    • Pressure range: 70MPa
    • Accuracy: +5% to -5%
    • Output: 4~20mA DC
    • Input voltage: 24V

    Could you please tell me which solution is suitable for it?

    Regards,
    Ochi

  • 0 in reply to Yoshiki Ochi
    TI__Mastermind 31655 points

    Since automotive qualification is needed, I would initially suggest the PGA302. The commercial version is currently released, but the automotive version is set to be released in 4Q20. The commercial version could be used for initial evaluation.

    The main reason for the suggestion is because the PGA302 is a simpler device that does not require user-created firmware and it will be quicker to get up and running.

    The drawback is that the PGA302 is designed to work with a 5V input, and it does not internally support 4-20mA operation. To work in this situation, the PGA302 would need to be supplied by a regulator, and some external circuitry would be needed to derive a 4-20mA output from the PGA302's voltage output. I'm attaching a simple TINA simulation of a circuit that would generate a 4-20mA signal using the PGA302's output DAC in the range of 0.5V to 4.5V (the full range of the output DAC is 0-5V).

    PGA302-4-20mA-Example.TSC

    This circuit is based off of a TI design that you can see here: http://www.ti.com/tool/TIPD158

    The TI design includes more detailed circuit analysis and simulations.

    Regards,

  • 0 in reply to Scott Cummins
    TI__Expert 7985 points

    Thank you for your comments!

    Regards,
    Ochi