--- title: Ratiometric Analog Outputs for OEM Pressure Transducer Applications description: See how Ratiometric (RM) pressure transducers are cost-effective, easy-to-install sensors designed to accommodate a wide range of high-pressure applications. image: https://blog.ashcroft.com/hubfs/Repost-RatioMetr_OEM_BLOG.jpg --- [Skip to main content](https://blog.ashcroft.com/oem-ratiometric-pressure-transducers-voltage-output#maincontent) Select Region - [US & Canada](https://ashcroft.com) - [Europe](https://ashcroft.eu/) - [China](http://www.ashcroft.com.cn/) - [Mexico & Central America](http://www.ashcroft.com.mx/) - [South America](https://ashcroftsudamericana.com/) - [Brazil](https://ashcroft.com.br/) Login - [Distributor Extranet](https://extranet.ashcroft.com/) - [Product Configurator](https://www.ashcroft.com/my-account/) [Careers](https://www.ashcroft.com/careers) [Contact](https://www.ashcroft.com/contact/) [![ashcroft-logo-lg-2](https://blog.ashcroft.com/hs-fs/hubfs/ashcroft-logo-lg-2.png?width=261&height=60&name=ashcroft-logo-lg-2.png) ![ashcroft-logo-white](https://blog.ashcroft.com/hubfs/assets/images/ashcroft-logo-white.svg)](https://www.ashcroft.com/) Products Pressure Instruments - [Pressure Gauges](https://www.ashcroft.com/products/pressure/pressure-gauges) - [Pressure Switches](https://www.ashcroft.com/products/pressure/pressure-switches) - [Pressure Sensors (Transducers/Transmitters)](https://www.ashcroft.com/products/pressure/pressure-sensors) - [Diaphragm Seals-Isolators](https://www.ashcroft.com/products/pressure/diaphragm-seals-and-isolators) - [Accessories](https://www.ashcroft.com/products/pressure/accessories) - [SMART Transmitter Assemblies](https://www.ashcroft.com/products/pressure/smart-transmitter-assemblies) Temperature Instruments - [Thermometers](https://www.ashcroft.com/products/temperature/thermometers) - [Thermowells](https://www.ashcroft.com/products/temperature/thermowells) - [Temperature Switches](https://www.ashcroft.com/products/temperature/temperature-switches) - [RTDs](https://www.ashcroft.com/products/temperature/rtds) - [Thermocouples](https://www.ashcroft.com/products/temperature/thermocouples) - [Temperature Transmitters](https://www.ashcroft.com/products/temperature/temperature-transmitters/) - [MultiPoint Temperature Sensors](https://www.ashcroft.com/products/temperature/multipoint-temperature-sensors/) - [OEM Temperature Sensors](https://www.ashcroft.com/products/temperature/oem-temperature-sensors) Test Instruments - [Calibrators](https://www.ashcroft.com/products/test-instruments/calibrators/) - [Hand Pumps-Controllers](https://www.ashcroft.com/products/test-instruments/hand-pumps-and-controllers/) - [Hydraulic Testers](https://www.ashcroft.com/products/test-instruments/hydraulic-testers/) - [Test Gauges](https://www.ashcroft.com/products/test-instruments/test-gauges/) Helpful Tools - [Product Documentation](https://www.ashcroft.com/learn/product-documentation/) - [Product & Quality Certifications](https://www.ashcroft.com/about/quality-certifications/) - [Material Selector & Corrosion Guide](https://www.ashcroft.com/webtools/materialselector/) - [Unit Converter](https://www.ashcroft.com/webtools/calculatoruom/) - [Wake Frequency Calculator](https://www.ashcroft.com/webtools/calculatorwf/) - [FAQs](https://www.ashcroft.com/faq/) Keep your critical equipment and processes running with reliable pressure and temperature measurements. 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Subscribe now and get the latest blog posts delivered straight to your inbox. # Ratiometric Analog Outputs for OEM Pressure Transducer Applications Print/Save as PDF ![Todd McPadden, Product Sales Leader, High Pressure Transducers's headshot](https://blog.ashcroft.com/hs-fs/hubfs/image-3.png?width=50&height=50&name=image-3.png) **By:** [Todd McPadden](https://blog.ashcroft.com/author/todd-mcpadden) Product Sales Leader, High Pressure Transducers **Published on:** November 6th, 2023 **Last updated on:** April 8th, 2026 **Topics:** [pressure transducers](https://blog.ashcroft.com/topic/pressure-transducers) [pressure sensors](https://blog.ashcroft.com/topic/pressure-sensors) [OEM](https://blog.ashcroft.com/topic/oem) [ratiometric](https://blog.ashcroft.com/topic/ratiometric) **Share:** [mailto:?subject=Ratiometric+Analog+Outputs+for+OEM+Pressure+Transducer+Applications&body=https://blog.ashcroft.com/oem-ratiometric-pressure-transducers-voltage-output](mailto:?subject=Ratiometric+Analog+Outputs+for+OEM+Pressure+Transducer+Applications&body=https://blog.ashcroft.com/oem-ratiometric-pressure-transducers-voltage-output) ![](https://blog.ashcroft.com/hs-fs/hubfs/Repost-RatioMetr_OEM_BLOG.jpg?width=1600&height=534&name=Repost-RatioMetr_OEM_BLOG.jpg) If you are an Original Equipment Manufacturer (OEM) looking to optimize cost and streamline installation processes, you’ll want to learn more about ratiometric (RM) output pressure transducers. These highly efficient and cost-effective solutions are engineered to accommodate a wide range of applications, such as off-highway vehicles (OHV), motorsports, and mobile hydraulic systems.  I recently [published a blog](https://blog.ashcroft.com/oem-high-pressure-transducers-product-comparison) that reviewed three key factors to consider when selecting an OEM pressure transducer: reliability, durability, and repeatability. Ratiometric output transducers incorporate all three factors and more. In this article, you will learn how these pressure measurement instruments can help you achieve cost savings while ensuring seamless integration and enhanced performance in demanding environments. ## What is ratiometric output? The term "ratiometric" refers to an output signal that changes in direct proportion to a change in input or supply voltage. In other words, as the supply voltage fluctuates, the zero point and sensitivity of the output signal also vary accordingly. The concept behind this type of output is to use the same reference voltage for both the sensor and the display, such as an A/D converter. This ensures that any error in the reference voltage is automatically compensated for. Analog output signals are commonly used in pressure, temperature and other types of sensors. When it comes to analog output, there are various input/output (I/O) options available, including those listed in the table below. *Figure 1: Analog Output Options  * ![transducer analog output](https://blog.ashcroft.com/hs-fs/hubfs/transducer%20analog%20output.png?width=386&height=302&name=transducer%20analog%20output.png) Common non-ratiometric output signals include 1-5 Vdc, 0-10 Vdc and 4-20 mA.  These types of outputs normally require minimum excitation voltages of 9 to 14 Vdc, which can be difficult to design into equipment running off of typical 12 Vdc battery systems used on vehicles and other mobile equipment applications.  However, since these types of systems can be subject to voltage loss under certain conditions. For instance, environmental factors or not being charged properly can cause voltage drops on a 12 Vdc battery that can fall to 9 Vdc or below, creating supply voltage issues to operate the transducer. Ratiometric outputs, on the other hand, require a fixed regulated power supply source that can be low voltage and does not require internal power regulators. That makes them ideal for use on vehicle and mobile equipment applications where space and power requirements are a factor.[![Mistakes to Avoid when Selecting Pressure Sensors](https://no-cache.hubspot.com/cta/default/4021582/06bd9901-2bce-469f-88b2-0f0a640e15fe.png)](https://cta-redirect.hubspot.com/cta/redirect/4021582/06bd9901-2bce-469f-88b2-0f0a640e15fe) How does ratiometric output work? Ratiometric sensors typically operate on a supply voltage of 5 VDC, with a tolerance of +/- 10%. The output of the device is directly proportional to the input, ranging from 10% to 90%. To illustrate, consider a scenario where you have a 5.00 VDC supply and a pressure sensor with a range of 100 psi. In this case, when there is no pressure on the port (0 psi), the output will be 0.5 V. Conversely, when there is full pressure on the port (100 psi), the output will be 4.5 V. *Figure 2: Output Voltage with Input Voltage 5.00 Vdc*![OutputVoltage](https://blog.ashcroft.com/hs-fs/hubfs/OutputVoltage.png?width=740&height=479&name=OutputVoltage.png) ## What are the benefits of ratiometric transducers? As previously stated, when purchasing a pressure transducer for OEM applications, the top three features to look for include:  - Reliability. Ability to test pressure with the same tool and get a consistent reading every time. No need for a span adjustment.  - Durability - Rugged construction designed to withstand vibration, pressure spikes and pulsation that are common in OEM applications.  - Accuracy - Technology that ensures you meet the minimum requirements of the application such as field-proven polysilicon, and thin film (CVD) pressure sensor technology.  In addition to those above, ratiometric transducers offer: - Ease of design and installation. Ratiometric output transducers require less peripheral equipment to work in a system.  - **Low-power, low-current consumption options****.** These sensors are able to run with lower voltage power supplies, leading to lower costs for OEM product design and installation value to the end-user. - Multiple signal configurations.  Ratiometric sensors fit a variety of electronics options, power supplies and PLCs. - "Live Zero" options. Improved troubleshooting support (for example, no power vs system/sensor failure). ## What are the challenges of ratiometric outputs? Unlike digital or 4-20 mA outputs, which are less affected by cable length, ratiometric outputs require a fixed low-power voltage source, so signal loss and noise interference can occur as cable lengths increase. With that in mind, the cable and sensor should be installed away from noise sources such as Variable Frequency Devices (VFD), high voltage cables, etc., or shielded after installation. ## Examples of ratiometric output transducers. Ashcroft has been providing pressure sensors to the OEM market for more than 30 years for use with oil/fuel systems, brakes, manifolds, transmission, diagnostics and more. Transducers that offer ratiometric output include: The [S1](https://www.ashcroft.com/products/pressure/pressure-sensors/s1-pressure-transducer/) high-volume sensor is compact and highly configurable. It offers a wide selection of material and connection choices that are designed for vibration, shock and high cycle life. The [G2](https://www.ashcroft.com/products/pressure/pressure-sensors/g2-pressure-transducer/) rugged-design sensor is engineered for installations and conditions that also produce substantial vibration, shock and high-cycle life. The [G3](https://www.ashcroft.com/products/pressure/pressure-sensors/g3-pressure-transducer/) highly compatible sensor is designed with all 316L stainless steel wetted parts for use with many types of process media and is available for low-pressure, vacuum or absolute pressure applications. The [KTS1](https://www.ashcroft.com/products/temperature/oem-temperature-sensors/kts1-temperature-sensor/) temperature sensor is designed for rugged OEM applications requiring analog outputs Each of these pressure transducers incorporates Ashcroft’s proven sensing technologies to provide a cost-effective option designed with easy installation and cost-saving benefits.  ## Ready to learn more about ratiometric outputs? If you would like support specifying a ratiometric pressure sensor for your system, [contact us](https://www.ashcroft.com/contact/) to speak with a product specialist. You can also explore the related resources below or [download our guide](https://sales.ashcroft.com/five-mistake-oem-system-ebook-lp?_ga=2.221937179.2075457622.1658759383-1727663658.1617109357) to learn about common selection errors OEMs and system integrators encounter when choosing pressure transducers.[![Mistakes to Avoid when Selecting Pressure Sensors](https://no-cache.hubspot.com/cta/default/4021582/06bd9901-2bce-469f-88b2-0f0a640e15fe.png)](https://cta-redirect.hubspot.com/cta/redirect/4021582/06bd9901-2bce-469f-88b2-0f0a640e15fe) [Todd McPadden, Product Sales Leader, High Pressure Transducers](https://blog.ashcroft.com/author/todd-mcpadden) Todd is the product manager for OEM High-Pressure Transducers with more than 19 years of experience at Ashcroft. Connect: [mailto:todd.mcpadden@ashcroft.com](mailto:todd.mcpadden@ashcroft.com) Topics: [pressure transducers](https://blog.ashcroft.com/topic/pressure-transducers) [pressure sensors](https://blog.ashcroft.com/topic/pressure-sensors) [OEM](https://blog.ashcroft.com/topic/oem) [ratiometric](https://blog.ashcroft.com/topic/ratiometric) Don't forget to share this post: ## Related Articles ### [![](https://blog.ashcroft.com/hs-fs/hubfs/Choosing%20Pressure%20Sensor%20for%20OHV_BLOG%20(1).png?width=1600&height=534&name=Choosing%20Pressure%20Sensor%20for%20OHV_BLOG%20(1).png) How Do You Choose a Pressure Sensor for Off-Highway Vehicles? 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