Relio R4

Relio R4-i7Relio R4-i3Relio R4-N2800


Relio R4 - Intel 3rd Gen. Core i7/i3/Atom 19" 1U Rack-mount PC with up to 16GB DDR3 memory, Mini PCI-Express and two SeaRAQ I/O expansion slots

Wide Voltage

These devices and systems have been designed to accept a wide voltage DC power input. This feature is desirable in the industrial market where a fixed voltage level or mains AC power cannot be guaranteed.


These products use heatsink, heatpipe and extrusion technology to dissipate the heat generated by the system rather than using traditional fans thus improving system reliability and longevity.


This product supports Linux based kernels. See product datasheet and manual for a list of compatible Linux kernels and distributions (for development and pre-sales support please contact our technical sales team).


This product fully adheres to the Restriction of Hazardous Substances Directive 2002/95/EC, RoHS for short.  The directive covers the restriction of use of certain hazardous substances in electrical and electronic equipment and was adopted in February 2003 by the European Union.


CE is a mandatory standard for products on the market in the European Economic Area. By CE marking a product, the manufacturer ensures that the item meets the essential safety requirements set out in the applicable CE directive.

FCC Approved

The Federal Communications Commission (FCC) is an independent agency of the United States government that sets standards and governs the testing of conducted and radiated emissions such as EMI.


Underwriters Laboratories (UL) is an independent product safety certification organisation based in the United States. UL develops standards for products, materials, components, assemblies, tool and equipment, mainly dealing with product safety.

Relio R4 1U rack PC
Relio R4Relio R4Relio R4

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Relio R4-i7

Relio R4 with Intel Core i7-3517UE 1.7GHz processor and 16GB DDR3 memory

Relio R4-i3

Relio R4 with Intel Core i3-3217UE 1.6GHz processor and 16GB DDR3 memory

Relio R4-N2800

Relio R4 with Intel Atom N2800 1.8GHz processor and 4GB DDR3 memory


SeaRAQ 8x Channel-to-Channel Isolated A/D Inputs Expansion Module


SeaRAQ 6x Isolated RTD Analog Inputs Expansion Module


SeaRAQ 6x Isolated Thermocouple Inputs (Type E, J, or K) Expansion Module


SeaRAQ 8x Channel Isolated 4-20 mA Current Loop Transmitter Outputs Expansion Module


SeaRAQ 16x Isolated Digital Inputs (3V to 30V DC) Expansion Module


SeaRAQ 16x Isolated Digital Inputs (0V to 132V AC) Expansion Module


SeaRAQ 16x Isolated Form A Relay Outputs Expansion Module


SeaRAQ 8x Isolated Form A Relay Outputs Expansion Module


DB9 Female to DB9 Male Extension Cable, 72" in Length


DB9 Female to DB9 Female Null Modem Cable, 10' in Length


Terminal Block - DB9 Female to 9 Screw Terminals


Terminal Block Kit - TB05 + CA127 Cable


DB9 Female to RJ45 Modular Adapter


DB9 Male to DB9 Female Low Profile Null Modem Adapter

* Lead time is indicative and is subject to change at time of ordering. Next business day delivery on in-stock products only (when ordered before 3pm).
** Contact us for quantity or project pricing.
† Additional delivery charge may be incurred for certain postcodes (calculated at checkout)
VELA Rack - Powerful Industrial PCs, configured for your industry
Combining 38 years of Advantech's world-leading industrial computing development with 28 years of Impulse's industrial computing capabilities, the new VELA Rack range of configurable rack PC systems has the pedigree to support the most critical applications.
Learn about VELA Rack

Relio R4 overview

  • 1U 19" rack-mount enclosure with powder-coated finish
  • Silent solid-state, fanless design with no moving parts
  • COM Express Type 6 Module supports Intel 3rd Gen. Core i7/i3/Atom processors
  • Up to 16GB DDR3 system memory
  • Removable 2.5" solid-state disk (SSD) drive is perfect for rugged applications
  • 1x DisplayPort
  • 1x RS-485 and 2x RS-232 ports
  • Dual Gigabit Ethernet ports
  • 5x USB2.0 ports
  • 2x SeaRAQ expansion slots for optional analog, digital and serial I/O
  • 1x Mini PCI Express expansion slot
  • Integrated graphics supporting DirectX and OpenGL 3.x
  • Supports ACPI power management
  • Supports Windows or Linux operating systems
  • Wide 18V to 36V DC power input
  • 0°C to +50°C operating temperature
The Relio R4 is a fanless, solid-state 1U rackmount computer with no internal cables. The system is ideal for rugged applications that demand high reliability, I/O expansion, scalable processing and a long product life cycle.

The R4 builds upon the advantages of the COM Express architecture and features your choice of Intel dual-core processor (Atom N2800 1.8GHz; Core i3 1.6GHz; Core i7 1.7GHz) and up to 16GB RAM. The rackmount system requires low power consumption while operating fanless over an operating temperature range of 0°C to +50°C.

A wealth of standard I/O features include dual Gigabit Ethernet, five USB2.0 ports, three serial ports, DisplayPort video and audio interfaces. The R4 operates with no moving parts or internal cables, eliminating the most common causes of failure.

Featuring two SeaRAQ I/O expansion slots, the Relio R4 offers extra expansion capabilities and supports a variety of real-world analog I/O configurations such as A/D inputs, 4-20mA outputs, 0-20mA inputs, thermocouples and RTD inputs. Optically isolated inputs, relay outputs and additional serial interfaces are also available.

The Relio R4 operates from your choice of 2.5" SATA solid-state disk (SSD) that can be integrated and preloaded with 32-bit or 64-bit versions of Microsoft Windows or Linux operating systems. Operating from solid-state disk, the system is perfect for industrial and commercial rackmount environments including process control, test & measurement and HMI applications.

Impulse is the exclusive UK distributor of Sealevel products and can supply you the Relio R4 along with a wide range of industrial computing and communication products.

For more information about the Relio R4 1U rack PC please contact our technical sales team on +44 (0)1782 337 800, or alternatively submit an enquiry.
Enquire about the Relio R4
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+44(0)1782 337 800
STOCK ALERT!Rack PCs, Embedded Box PCs, SBCs, and IIoT devices in stock and ready to ship.
Richard B.
Given we're in the middle of a global components shortage, the team at Impulse have gone out of their way to ensure our strict supply requirements are met. To this day, Impulse remain to be a cornerstone supplier and partner for our business.
Sep 2021
+44(0)1782 337 800