A pressure sensor measures the pressure of a liquid or gas and converts it into an electrical signal. In a pressure transmitter, also called a pressure transducer, built-in electronics turn that signal into a standard output such as 4\u201320 mA or 0\u201310 V, so a PLC or controller can read it directly. SCN supplies pressure transmitters and pressure switches from Huba Control, Sensata and Precision Sensors for hydraulics and pneumatics, compressors and pumps, refrigeration and HVAC, marine use and mobile machinery.<\/p>\n
The range covers ceramic and piezoresistive transmitters from 50 mbar up to 1000 bar, sensitive differential pressure sensors from 0\u2013100 mbar for air flow and filter monitoring, and models with ATEX approval, for refrigerants including ammonia and CO\u2082, and for hydrogen up to 900 bar. Rugged IP69K transmitters for work machines are found under pressure sensors for mobile machinery<\/a>. If you need an on\/off signal at a set pressure rather than a measured value, see pressure switches<\/a> for gauge, absolute, differential and vacuum pressure. All sensor types are listed under Sensors<\/a>.<\/p>\n How to choose:<\/strong> start with the medium and the pressure range \u2013 the normal working pressure should sit well inside the range, with margin for pressure peaks. Then choose the pressure type (gauge, absolute or differential), output signal, process connection and electrical connector. Finally check accuracy, temperature range, IP rating and the approvals your application requires, such as ATEX.<\/p>\n A pressure transmitter measures how much a thin diaphragm deflects under pressure and converts that into a standard electrical signal. In ceramic sensors the deflection changes a capacitance or a thick-film resistor bridge; in piezoresistive sensors it changes the resistance of silicon strain gauges. Built-in electronics compensate for temperature and output 4\u201320 mA, 0\u201310 V or a digital value such as Modbus RTU or I2C.<\/p><\/details>\n A pressure switch gives an on\/off signal when the pressure passes a set point, while a pressure transmitter outputs a continuous value across its whole range. Switches start and stop compressors and pumps or raise an alarm on filter and fan pressure; transmitters are used when the controller needs the actual pressure. Programmable transmitters such as Huba Control 540 combine both, with two switch points.<\/p><\/details>\nFrequently asked questions<\/h3>\n
How does a pressure transmitter work?<\/summary>
What is the difference between a pressure switch and a pressure transmitter?<\/summary>