Sealevel Serial, I/O, and Embedded Computing Solutions

We supply Sealevel Systems' high-reliability serial, digital I/O, and embedded computing products built for long-term operation in harsh and highly regulated environments.

Their range includes PCIe and PCI serial cards, Ethernet-to-serial devices, industrial I/O modules, and fanless embedded computers. Built for use in military, medical, and industrial environments, Sealevel products are known for rock-solid performance, extended lifecycle support, and compliance with strict operational standards.

Explore our Sealevel product range or get in touch for specialist advice.

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Showing 300 of 426 Sealevel Products items

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2 options available

Sealevel 5102 Series

1 Port RS-232/422/485/530/530A/V.35 Low Profile PCI Synchronous Serial Card

1 option available

Sealevel 4803 Series

8 Port RS-232/422/485 Ethernet Serial Device Server

2 options available

Sealevel 4802 Series

8 Port RS-422/485 Ethernet Serial Device Server

1 option available

Sealevel 4801 Series

8 Port RS-232 Ethernet Serial Device Server

1 option available

Sealevel 470W Series

Wireless 802.11b/g Modbus TCP to 16 Analog Input/2 Analog Output – 8 Isolated Digital Input/8 Digital Output Adapter

From £563.50 (exc. VAT)

1 option available

Sealevel 470U Series

USB Modbus RTU to 16 Analog Input/2 Analog Output – 8 Isolated Digital Input/8 Digital Output Adapter

1 option available

Sealevel 470U-OEM Series

USB Modbus RTU to 16 Analog Input/2 Analog Output – 8 Isolated Digital Input/8 Digital Output OEM Board

1 option available

Sealevel 470N Series

16 Analog Input/2 Analog Output – 8 Isolated Digital Input/8 Digital Output SeaI/O Expansion Module

From £465.50 (exc. VAT)

1 option available

Sealevel 470E Series

Ethernet Modbus TCP to 16 Analog Input/2 Analog Output – 8 Isolated Digital Input/8 Digital Output Adapter

From £539.00 (exc. VAT)

1 option available

Sealevel 470E-OEM Series

Ethernet Modbus TCP to 16 Analog Input/2 Analog Output – 8 Isolated Digital Input/8 Digital Output OEM Board

From £526.50 (exc. VAT)

1 option available

Sealevel 463W Series

Wireless 802.11b/g Modbus TCP to 96 Channel TTL Digital I/O Adapter

From £329.00 (exc. VAT)

1 option available

Sealevel 463U Series

USB Modbus RTU to 96 Channel TTLDigital I/O Adapter

Our Team Is Here to Help

Get in touch with us today.

Speak to a member of our friendly team to discuss your project and find out how we can support you. Our technical sales team are ready to answer your questions.

Call: +44 (0)1782 337 800 | Email: sales@impulse-embedded.co.uk

1 option available

Sealevel 463U-OEM Series

USB Modbus RTU to 96 Channel TTLDigital I/O OEM Board

1 option available

Sealevel 463N Series

96 Channel TTL Digital Interface SeaI/O Expansion Module

From £281.00 (exc. VAT)

1 option available

Sealevel 463E Series

Ethernet Modbus TCP to 96 Channel TTL Digital I/O Adapter

From £358.00 (exc. VAT)

1 option available

Sealevel 463E-OEM Series

Ethernet Modbus TCP to 96 Channel TTL Digital I/O OEM Board

From £332.00 (exc. VAT)

1 option available

Sealevel 462U-OEM Series

USB Modbus RTU to 96 Channel TTLDigital I/O OEM Board

2 options available

Sealevel 462U Series

USB Modbus RTU to 96 Channel TTL – DB78F Digital I/O Adapter – SeaI/O-462U

1 option available

Sealevel 462E-OEM Series

Ethernet Modbus TCP to 96 Channel TTL DB78F Digital I/O OEM Board

From £383.50 (exc. VAT)

2 options available

Sealevel 462E Series

Ethernet Modbus TCP to 96 Channel TTL DB78F Digital I/O Adapter

From £409.00 (exc. VAT)

1 option available

Sealevel 450W Series

Wireless 802.11b/g Modbus TCP to 16 Form C Relay Output Adapter

From £378.00 (exc. VAT)

1 option available

Sealevel 450U Series

USB Modbus RTU to 16 Form C Relay Output Adapter

1 option available

Sealevel 450U-OEM Series

USB Modbus RTU to 16 Form C Relay Output OEM Board

2 options available

Sealevel 450N Series

16 Form C Relay Output SeaI/O Expansion Module

From £266.50 (exc. VAT)

1 option available

Sealevel 450E Series

Ethernet Modbus TCP to 16 Form C Relay Output Adapter

From £353.50 (exc. VAT)

1 option available

Sealevel 450E-OEM Series

Ethernet Modbus TCP to 16 Form C Relay Output OEM Board

From £340.50 (exc. VAT)

1 option available

Sealevel 440W Series

Wireless 802.11b/g Modbus TCP to 32 Reed Relay Output Adapter

From £403.00 (exc. VAT)

1 option available

Sealevel 440U Series

USB Modbus RTU to 32 Reed Relay Output Adapter

1 option available

Sealevel 440U-OEM Series

USB Modbus RTU to 32 Reed Relay Output OEM Board

2 options available

Sealevel 440N Series

32 Reed Relay Output SeaI/O Expansion Module – board only

From £291.00 (exc. VAT)

1 option available

Sealevel 440E Series

Ethernet Modbus TCP to 32 Reed Relay Output Adapter

From £378.00 (exc. VAT)

1 option available

Sealevel 440E-OEM Series

Ethernet Modbus TCP to 32 Reed Relay Output OEM Board

From £366.00 (exc. VAT)

1 option available

Sealevel 4403 Series

4 Port RS-232/422/485 Ethernet Serial Device Server

2 options available

Sealevel 4402 Series

4 Port RS-422/485 Ethernet Serial Device Server

1 option available

Sealevel 4401 Series

4 Port RS-232 Ethernet Serial Device Server

1 option available

Sealevel 430W Series

Wireless 802.11b/g Modbus TCP to 32 Isolated Digital Input Adapter

From £329.00 (exc. VAT)

1 option available

Sealevel 430U Series

USB Modbus RTU to 32 Isolated Digital Input Adapter

1 option available

Sealevel 430U-OEM Series

USB Modbus RTU to 32 Isolated Digital Input OEM Board

1 option available

Sealevel 430N Series

32 Optically Isolated Digital Input SeaI/O Expansion Module

From £230.00 (exc. VAT)

1 option available

Sealevel 430E Series

Ethernet Modbus TCP to 32 Isolated Digital Input Adapter

From £304.50 (exc. VAT)

1 option available

Sealevel 430E-OEM Series

Ethernet Modbus TCP to 32 Isolated Digital Input OEM Board

1 option available

Sealevel 420W Series

Wireless 802.11b/g Modbus TCP to 16 Isolated Digital Input/8 Form C Relay Output Adapter

From £366.00 (exc. VAT)

1 option available

Sealevel 420U Series

USB Modbus RTU to 16 Isolated Digital Input/8 Form C Relay Output Adapter

1 option available

Sealevel 420U-OEM Series

USB Modbus RTU to 16 Isolated Digital Input/8 Form C Relay Output OEM Board

1 option available

Sealevel 420N Series

16 Optically Isolated Digital Input/8 Form C Relay Output SeaI/O Expansion Module

From £266.50 (exc. VAT)

1 option available

Sealevel 420E Series

Ethernet Modbus TCP to 16 Isolated Digital Input/8 Form C Relay Output Adapter

From £340.50 (exc. VAT)

1 option available

Sealevel 420E-OEM Series

Ethernet Modbus TCP to 16 Isolated Digital Input/8 Form C Relay Output OEM Board

From £329.00 (exc. VAT)

1 option available

Sealevel 4203 Series

2 Port RS-232/422/485 Ethernet Serial Device Server

2 options available

Sealevel 4202 Series

2 Port RS-422/485 Ethernet Serial Device Server,

1 option available

Sealevel 4201 Series

2 Port RS-232 Ethernet Serial Device Server

1 option available

Sealevel 4163 Series

16 Port RS-232/422/485 Ethernet Serial Device Server

1 option available

Sealevel 4162 Series

16 Port RS-422/485 Ethernet Serial Device Server

1 option available

Sealevel 4161 Series

16 Port RS-232 Ethernet Serial Device Server

1 option available

Sealevel 410W Series

Wireless 802.11b/g Modbus TCP to 16 Isolated Digital Input/16 Reed Relay Output Adapter

From £353.50 (exc. VAT)

1 option available

Sealevel 410U Series

USB Modbus RTU to 16 Isolated Digital Input/16 Reed Relay Output Adapter

1 option available

Sealevel 410U-OEM Series

USB Modbus RTU to 16 Isolated Digital Input/16 Reed Relay Output OEM Board

1 option available

Sealevel 410N Series

16 Optically Isolated Digital Input/16 Reed Relay Output SeaI/O Expansion Module

From £254.50 (exc. VAT)

1 option available

Sealevel 410E Series

Ethernet Modbus TCP to 16 Isolated Digital Input/16 Reed Relay Output Adapter

From £329.00 (exc. VAT)

1 option available

Sealevel 410E-OEM Series

Ethernet Modbus TCP to 16 Isolated Digital Input/16 Reed Relay Output OEM Board

From £316.00 (exc. VAT)

1 option available

Sealevel 4104 Series

1 Port RS-232/422/485 Ethernet Serial Device Server

Showing 300 of 426

What Is Sealevel’s Specialty?
Sealevel focus on serial and I/O expansion solutions, including USB-to-serial adaptors, digital I/O modules and embedded control systems. Their designs are trusted where reliable connectivity is required across industrial and military sectors.

Why Choose Sealevel Hardware?
With extensive experience in serial communications, Sealevel products provide the robust connectivity needed to extend the life of legacy equipment. Many models also meet MIL-STD specifications for defence projects.

Why Source in the UK Through Impulse?
We deliver Sealevel hardware to our UK customers with technical guidance and lifecycle support, ensuring integration is seamless and supply is dependable across long-term projects.