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 360 of 426 Sealevel Products items

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2 options available

Sealevel 7201 Series

2 Port RS-232/422/485 PCI Serial Card

2 options available

Sealevel 7161e Series

16 Port RS-232 PCI Express Asynchronous Serial Card

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 420S Series

RS-232 Modbus RTU to 16 Isolated Digital Input/8 Form C Relay Output Adapter

From £266.50 (exc. VAT)

1 option available

Sealevel 420S-OEM Series

RS-232 Modbus RTU to 16 Isolated Digital Input/8 Form C Relay Output OEM Board

From £254.50 (exc. VAT)

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 420M Series

RS-485 Modbus RTU to 16 Isolated Digital Input/8 Form C Relay Output Adapter

From £266.50 (exc. VAT)

1 option available

Sealevel 420M-OEM Series

RS-485 Modbus RTU to 16 Isolated Digital Input/8 Form C Relay Output OEM Board

From £254.50 (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 410S Series

RS-232 Modbus RTU to 16 Isolated Digital Input/16 Reed Relay Output Adapter

From £254.50 (exc. VAT)

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 410M Series

RS-485 Modbus RTU to 16 Isolated Digital Input/16 Reed Relay Output Adapter

From £254.50 (exc. VAT)

1 option available

Sealevel 410M-OEM Series

RS-485 Modbus RTU to 16 Isolated Digital Input/16 Reed Relay Output OEM Board

From £242.00 (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

1 option available

Sealevel 4103 Series

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

2 options available

Sealevel 4102 Series

1 Port RS-422/485 Ethernet Serial Device Server

1 option available

Sealevel 4101 Series

1 Port RS-232 Ethernet Serial Device Server

1 option available

Sealevel 4030 Series

48 Channel TTL Digital I/O ISA Card

2 options available

Sealevel 3730 Series

16 Isolated Digital Input/16 Reed Relay Output PC/104 Module – DIO-32.104

2 options available

Sealevel 3720 Series

16 Isolated Digital Input PC/104 Module – DIO-104.OPTO

2 options available

Sealevel 3710 Series

16 Reed Relay Output PC/104 Module – DIO-104.REL

2 options available

Sealevel 3701 Series

48 Channel TTL Digital I/O PC/104 Module – DIO-48.PC104

1 option available

Sealevel 3588 Series

8 Port RS-485 PC/104 Serial Card

1 option available

Sealevel 3540 Series

4 Port RS-232/422/485 PC/104 Serial Card

1 option available

Sealevel 3514 Series

1 Port RS-232/422/485/530/530A/V.35 PC/104+ Synchronous Serial Card

1 option available

Sealevel 3512 Series

1 Port RS-232/422/485/530/530A/V.35 PC/104 Synchronous Serial Card

1 option available

Sealevel 3098 Series

32 Switched Relay Output ISA Card

2 options available

Sealevel 3096 Series

8-Channel Isolated Digital Input/8-Channel Reed Relay Output ISA Card

1 option available

Sealevel 3095 Series

16 Reed Relay Output ISA Card

2 options available

Sealevel 3094 Series

16 Optically Isolated Digital Input ISA Card – ISO-16

2 options available

Sealevel 3093 Series

16-Channel Isolated Digital Input/16-Channel Reed Relay Output ISA Card

1 option available

Sealevel 2833 Series

8 Port RS-232/422/485 (DB9) Serial to USB Adapter

1 option available

Sealevel 2823 Series

8 Port RS-232/422/485 (DB9) Serial to USB Adapter

From £521.00 (exc. VAT)

4 options available

Sealevel 2807 Series

8 Port RS-232/485 RJ45 Versacom Serial to USB Adapter

From £435.50 (exc. VAT)

4 options available

Sealevel 2804 Series

8 Port RS-232 RJ45 Serial to USB Adapter

From £466.00 (exc. VAT)

1 option available

Sealevel 2803 Series

8 Port RS-232/422/485 (DB9) Serial to USB Adapter

From £524.00 (exc. VAT)

2 options available

Sealevel 2802 Series

8 Port RS-422/485 DB9 Serial to USB Adapter

From £503.50 (exc. VAT)

1 option available

Sealevel 2801 Series

8 Port RS-232 (DB9) Serial to USB Adapter

From £357.50 (exc. VAT)

1 option available

Sealevel 270U Series

7 Port Isolated Industrial USB 2.0 Hub

1 option available

Sealevel 2433 Series

4 Port RS-232/422/485 (DB9) Serial to USB Adapter

1 option available

Sealevel 2423 Series

4 Port RS-232/422/485 (DB9) Serial to USB Adapter

4 options available

Sealevel 2407 Series

4 Port RS-232/485 RJ45 Versacom Serial to USB Adapter

From £335.50 (exc. VAT)

4 options available

Sealevel 2404 Series

4 Port RS-232 RJ45 Serial to USB Adapter

From £321.00 (exc. VAT)

1 option available

Sealevel 2403 Series

4 Port RS-232/422/485 (DB9) Serial to USB Adapter

From £387.00 (exc. VAT)

1 option available

Sealevel 2402 Series

4 Port RS-422/485 (DB9) Serial to USB Adapter

From £196.50 (exc. VAT)

1 option available

Sealevel 2401 Series

4 Port RS-232 (DB9) Serial to USB Adapter

From £184.00 (exc. VAT)

Showing 360 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.