Electronic trimming technology and A/D converter controlled amplifiers based on switched capacitor technology are also sometimes used in pressure sensors. In some sensors the stainless steel pressure port resists unfriendly liquids like wastewater, oil, diesel, fuel etc. They are used in many industrial sectors and are suited for applications on hydraulic controls, pump and compressors, pneumatic controls, industrial robots, off-road vehicles, process controls, HVAC, water management and petrochemicals.