{"id":8234193,"date":"2026-10-24T17:30:18","date_gmt":"2026-10-24T17:30:18","guid":{"rendered":"https:\/\/scn.eu\/?post_type=scn_guide&#038;p=8234193"},"modified":"2026-10-24T17:30:18","modified_gmt":"2026-10-24T17:30:18","slug":"pressure-transmitters","status":"publish","type":"scn_guide","link":"https:\/\/scn.eu\/en\/guides\/pressure-transmitters\/","title":{"rendered":"Pressure transducer vs transmitter vs switch \u2013 how to choose"},"content":{"rendered":"<div class=\"scn-guide\">\n<h1>Pressure transducer vs transmitter vs switch \u2013 how to choose<\/h1>\n<p class=\"g-lead\">A pressure sensor turns the pressure of oil, air, water or gas into an electrical signal. Here is how a transducer, a transmitter and a pressure switch differ, what accuracy really covers and how to avoid common mistakes.<\/p>\n<div class=\"g-short\"><b class=\"t\">Short answer<\/b><\/p>\n<ul>\n<li><b>Reference<\/b> \u2013 first decide what the pressure is compared with: ambient air (gauge), vacuum (absolute) or another pressure (differential).<\/li>\n<li><b>Transmitter or switch<\/b> \u2013 a transmitter gives a measurement signal such as 4\u201320 mA, 0\u201310 V or CAN. A pressure switch only changes a contact at a set pressure.<\/li>\n<li><b>Range<\/b> \u2013 as a rule of thumb, normal pressure should sit at 50\u201375% of the range. Check the proof pressure against spikes.<\/li>\n<li><b>Accuracy<\/b> \u2013 compare the total error over the full temperature range, not just linearity at room temperature.<\/li>\n<li><b>Materials<\/b> \u2013 the medium decides: stainless steel, ceramic or plastic, and a seal that resists the fluid.<\/li>\n<\/ul>\n<\/div>\n<h2>Gauge, absolute or differential pressure?<\/h2>\n<p>All pressure is measured against a reference. <b>Gauge pressure<\/b> is measured against ambient air \u2013 what you see on the gauge of a hydraulic system or air line. <b>Absolute pressure<\/b> is measured against vacuum and is used when changes in atmospheric pressure must not affect the reading, as in vacuum processes, barometric measurement and gas mixing. <b>Differential pressure<\/b> is the difference between two ports, for example across a filter, a fan or an orifice plate for flow measurement.<\/p>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-tryck-f1-en.webp\" alt=\"Three sensing cells: gauge pressure is measured against ambient air, absolute pressure against vacuum and differential pressure between two ports\" width=\"1520\" height=\"500\" loading=\"lazy\" decoding=\"async\"><figcaption>The reference decides what the sensor measures: ambient air, vacuum or a second pressure.<\/figcaption><\/figure>\n<div class=\"g-short\">\n<p style=\"margin:0\">Units: 1 bar = 100 kPa = 0.1 MPa, and 1 psi is about 69 mbar. US datasheets write psig (gauge), psia (absolute) and psid (differential).<\/p>\n<\/div>\n<h2>Transducer, transmitter or pressure switch \u2013 what is the difference?<\/h2>\n<ul>\n<li><b>Pressure transducer<\/b> \u2013 the sensing cell with a simple signal, often a few millivolts per volt of supply (mV\/V). The signal needs amplifying.<\/li>\n<li><b>Pressure transmitter<\/b> \u2013 a sensor with built-in electronics and a standard output. What most people mean by a pressure sensor today.<\/li>\n<li><b>Pressure switch<\/b> \u2013 changes a contact when pressure passes a set point. Mechanical switches need no power supply; electronic ones often add an analogue signal.<\/li>\n<\/ul>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-tryck-f2-en.webp\" alt=\"Block diagram: a transducer gives a weak millivolt signal, a transmitter has electronics that output a standard signal and a pressure switch changes a contact at a set point\" width=\"1520\" height=\"472\" loading=\"lazy\" decoding=\"async\"><figcaption>The same sensing cell can sit in a transducer, a transmitter or a pressure switch. The electronics decide the signal.<\/figcaption><\/figure>\n<p>Choose a switch when you only need to know if pressure is too high or too low \u2013 low oil pressure, a clogged filter, a drop in compressed air. Choose a transmitter when the control system must regulate, log or alarm at several levels. For safety functions, switches assessed to IEC 61508 (SIL) and ISO 13849 (PL) are available.<\/p>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>Output<\/th>\n<th>Advantage<\/th>\n<th>Keep in mind<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"n\">4\u201320 mA<\/td>\n<td>Copes with long cables and interference. A broken wire shows at once, since zero is 4 mA.<\/td>\n<td>Often powered over the same two wires. Check the load resistance.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">0\u201310 V<\/td>\n<td>Simple to read in.<\/td>\n<td>Sensitive to interference and voltage drop on long cables.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Ratiometric<\/td>\n<td>Common in vehicles. The signal is a share of the supply, e.g. 10\u201390%.<\/td>\n<td>The controller must use the same supply as reference.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">CANopen, SAE J1939<\/td>\n<td>Many sensors on one bus, with diagnostics.<\/td>\n<td>Set address and bus termination correctly.<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">IO-Link<\/td>\n<td>Settings and diagnostics over a standard sensor cable (IEC 61131-9).<\/td>\n<td>Needs an IO-Link master.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2>Range, overload and pressure spikes<\/h2>\n<p>The range must cover normal operating pressure with a margin. Too large a range gives a bigger error in bar, since the error is a percentage of full scale (FS). \u00b10.5% FS is \u00b13 bar on a 600 bar sensor, even when you measure 20 bar.<\/p>\n<p>The datasheet also gives the <b>proof pressure<\/b>, which the sensor withstands without permanent change, and the <b>burst pressure<\/b>, where it breaks. In between, it may suffer a permanent zero shift.<\/p>\n<p>Pressure spikes are a common cause of failed sensors in hydraulics and water systems. When a valve closes quickly, pressure can reach several times the normal level for a few milliseconds \u2013 too fast to show on a gauge. An orifice (snubber) in the sensor port damps the peak. Cavitation, where vapour bubbles collapse, causes both spikes and erosion. Do not place the sensor directly after a pump, valve or restriction.<\/p>\n<h2>What does accuracy include?<\/h2>\n<p>Two sensors with 0.25% in the datasheet can differ a lot in practice. Check what the figure covers:<\/p>\n<ul>\n<li><b>Linearity<\/b> \u2013 deviation from a straight line. Stated as BFSL (best fit straight line), the figure is lower than one measured from zero to full scale.<\/li>\n<li><b>Hysteresis<\/b> \u2013 the signal difference at the same pressure when rising and falling.<\/li>\n<li><b>Repeatability<\/b> \u2013 how closely repeated readings agree.<\/li>\n<li><b>Temperature error<\/b> \u2013 how zero and sensitivity shift with temperature. Often the largest part outdoors and in mobile machines.<\/li>\n<li><b>Long-term stability<\/b> \u2013 how much the sensor drifts per year.<\/li>\n<\/ul>\n<p>The most useful figure is the <b>total error band<\/b> over the full compensated temperature range. It combines all of the above and shows how far the reading can really deviate.<\/p>\n<h2>Media, materials and installation<\/h2>\n<p>All wetted parts must withstand the medium. 316L stainless steel handles most oils, water and gases. Ceramic cells resist many aggressive media, and for ultra-pure processes and strong acids there are switches with PFA and PTFE wetted parts. Check the seal too: FKM, EPDM and NBR suit different fluids, and fully welded sensors have none.<\/p>\n<ol class=\"g-pit\">\n<li><b>Wrong position on the pipe.<\/b> With liquids, mount the sensor on the side of the pipe so that air does not collect at the diaphragm and sludge does not settle. With gas, mount it on top so condensate drains away.<\/li>\n<li><b>Blocked vent.<\/b> A gauge sensor needs ambient air via the cable or a vent. If paint or water blocks it, the reading follows air pressure and temperature.<\/li>\n<li><b>Hot steam straight onto the sensor.<\/b> A siphon or cooling tube protects the sensor from steam and media hotter than the datasheet allows.<\/li>\n<li><b>Over-tightened fitting.<\/b> An over-tightened thread can distort the housing and shift the zero, especially on low-pressure sensors. Follow the stated torque.<\/li>\n<\/ol>\n<h2>Where are pressure sensors and switches used?<\/h2>\n<ul>\n<li><b>Mobile machines<\/b> \u2013 hydraulic pressure in cranes, forestry machines and wheel loaders for load calculation, overload protection and control.<\/li>\n<li><b>Factories<\/b> \u2013 compressed air, lubrication, cooling water and hydraulic presses. A switch stops the machine on low oil pressure.<\/li>\n<li><b>Energy and water<\/b> \u2013 district heating, heat pumps, pumping stations and hydropower hydraulics.<\/li>\n<li><b>Plastics and food<\/b> \u2013 melt pressure in extruders and moulding machines, and hygienic sensors for washdown.<\/li>\n<li><b>Aerospace and defence<\/b> \u2013 welded, hermetically sealed sensors and switches for flight controls, brakes and landing gear.<\/li>\n<\/ul>\n<h2>Pressure sensors and switches from SCN<\/h2>\n<p>We carry pressure transmitters for mobile hydraulics from Huba Control, and sensors and switches for high-purity gases, aerospace and process industry from Precision Sensors, Sensata and Nominal Controls. Tell us the medium, pressure, signal and environment, and we will help you choose.<\/p>\n<h3>Examples from our range<\/h3>\n<div class=\"g-prod\"><a class=\"g-pc\" href=\"https:\/\/scn.eu\/en\/product\/604\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2025\/01\/pic_604.jpg\" alt=\"Huba Control 604 Pressure sensor\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Huba Control<\/span><span class=\"g-pn\">604 Pressure sensor<\/span><span class=\"g-pw\">Differential pressure switch for ventilation: monitors filters and fans and protects heating coils from overheating.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/en\/product\/staset-sil-3-pressure-switch-transducer\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/precision-sensors-staset-main.webp\" alt=\"Precision Sensors Staset SIL 3 pressure switch and transducer\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Precision Sensors<\/span><span class=\"g-pn\">Staset SIL 3 pressure switch and transducer<\/span><span class=\"g-pw\">Switch, transducer and display in one unit. The switch output is SIL 3 capable (IEC 61508) and PL e capable (ISO 13849).<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/en\/product\/px500\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2025\/01\/PX500.png\" alt=\"Sensata PX500 Pressure Transducer\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Sensata<\/span><span class=\"g-pn\">PX500 Pressure Transducer<\/span><span class=\"g-pw\">Pressure transducer from Sensata for \u221255 to 150 \u00b0C.<\/span><\/a><\/div>\n<div class=\"g-links\"><a href=\"https:\/\/scn.eu\/en\/product-category\/products\/sensors\/pressure-sensors\/\">Pressure sensors and transmitters<\/a><a href=\"https:\/\/scn.eu\/en\/product-category\/products\/sensors\/pressure-sensors\/pressure-sensors-mobile\/\">Pressure sensors \u2013 mobile<\/a><a href=\"https:\/\/scn.eu\/en\/product-category\/products\/sensors\/pressure-sensors\/pressure-switches\/\">Pressure switches<\/a><a href=\"https:\/\/scn.eu\/en\/product-category\/products\/network-products\/can-interfaces\/\">CAN interfaces<\/a><a href=\"https:\/\/scn.eu\/en\/product-category\/products\/connectors-and-cables\/\">Connectors and cables<\/a><\/div>\n<div class=\"g-cta\">\n<p>Not sure about range, signal or materials? Ask one of our engineers \u2013 you get an answer within 24 hours.<\/p>\n<p><a href=\"https:\/\/scn.eu\/en\/contact\/\">Ask an engineer<\/a><\/div>\n<h2>Frequently asked questions<\/h2>\n<details>\n<summary>What is the difference between a pressure transducer and a transmitter?<\/summary>\n<p>A transmitter has built-in electronics that output a standard signal such as 4\u201320 mA. A transducer, strictly speaking, gives a weak millivolt signal that must be amplified. In practice the terms are often mixed.<\/p>\n<\/details>\n<details>\n<summary>Should I choose 4\u201320 mA or 0\u201310 V?<\/summary>\n<p>4\u201320 mA copes better with interference and long cables, and a broken wire shows at once as the current drops below 4 mA. 0\u201310 V works well over short distances inside a machine or cabinet.<\/p>\n<\/details>\n<details>\n<summary>How do I choose the pressure range?<\/summary>\n<p>Normal operating pressure should sit at roughly 50\u201375% of the range, and spikes must stay below the proof pressure. Too large a range gives a bigger error in bar.<\/p>\n<\/details>\n<details>\n<summary>Why does my pressure sensor drift?<\/summary>\n<p>Common causes are spikes above the proof pressure, temperatures outside the compensated range, a blocked vent or an over-tightened fitting.<\/p>\n<\/details>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>A pressure sensor turns the pressure of oil, air, water or gas into an electrical signal. Here is how a transducer, a transmitter and a pressure switch differ, what accuracy really covers and how to avoid common mistakes.<\/p>\n","protected":false},"author":11,"featured_media":8234093,"template":"","meta":{"_yoast_wpseo_focuskw":"pressure transducer vs transmitter","_yoast_wpseo_metadesc":"Pressure transducer, transmitter or switch? How to choose reference, range, output and materials, and how to avoid pressure spikes and errors. 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