Why would a designer make their own pressure transducer if there are ones already available for purchase? Here is an excerpt from our blog post - Make or Buy: Which Pressure Transducer Path is Right for You.  

• What do I need from the total SYSTEM perspective?  
• How quickly will begin selling your product?
• What mechanical & electrical engineering skills do you have within your organization? What skills do you need to outsource? Do you have a qualified resource to use? 
• Do you have the equipment & personnel necessary to calibrate your own transducer? Typical equipment needed are temperature, pressure and humidity tools to modify the environment for calibration. 
• There are additional logistical issues to consider. For instance, what is your annual requirement of sensors? What is your time-to-market and cost targets? Where are you manufacturing? Are there any proprietary issues to consider? How many sources do you need?

By reviewing these questions, the path to deciding between make versus buy becomes much clearer. You should buy a complete transducer if you are resource-limited and have a fast-time to market requirement. Lower volumes typically under 25,000 sensors per year do not usually warrant the investment in making your own transducer. Above this quantity, return on investment on internal resources is improved and may be something to consider.

• Ceramic pressure sensors with amplified output
• Capacitive ceramic pressure sensors
• Uncalibrated pressure sensors, high pressure 3 PSI & up