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.

Enquire Now

Showing 420 of 426 Sealevel Products items

Sort By:

View:

Filter your results

Load Previous

1 option available

Sealevel 2228 Series

2 Port RS-232/422/485 (DB9) Software Configurable Serial to USB Adapter Board – PC Bracket

From £173.00 (exc. VAT)

1 option available

Sealevel 2223-OEM Series

2 Port RS-232/422/485 (DB9) OEM Serial to USB Board

From £185.00 (exc. VAT)

2 options available

Sealevel 2223 Series

2 Port RS-232/422/485 DB9 Serial to USB Adapter

From £184.00 (exc. VAT)

1 option available

Sealevel 2213 Series

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

From £297.00 (exc. VAT)

1 option available

Sealevel 2208 Series

2 Port RS-232 (DB9) Serial to USB Adapter Board – PC Bracket

From £140.50 (exc. VAT)

1 option available

Sealevel 2203 Series

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

From £230.00 (exc. VAT)

2 options available

Sealevel 2202 Series

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

From £230.00 (exc. VAT)

1 option available

Sealevel 2201 Series

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

From £149.50 (exc. VAT)

1 option available

Sealevel 2161 Series

16 Port RS-232 (RJ45) Serial to USB Adapter

1 option available

Sealevel 2128 Series

1 Port RS-232/422/485 (DB9) Software Configurable Serial to USB Adapter Board – PC Bracket

From £168.00 (exc. VAT)

1 option available

Sealevel 2123 Series

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

From £169.00 (exc. VAT)

1 option available

Sealevel 2113 Series

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

From £179.00 (exc. VAT)

1 option available

Sealevel 2108 Series

1 Port RS-232 (DB9) Serial to USB Adapter Board – PC Bracket

From £76.50 (exc. VAT)

1 option available

Sealevel 2107 Series

1 Port RS-485 (DB9) Serial to USB Adapter

From £93.00 (exc. VAT)

1 option available

Sealevel 2106 Series

1 Port RS-422 (DB9) Serial to USB Adapter

From £72.50 (exc. VAT)

1 option available

Sealevel 2105R Series

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

From £90.00 (exc. VAT)

1 option available

Sealevel 2104 Series

1 Port Isolated RS-232/422/485 (DB25) Serial to USB Adapter

From £125.50 (exc. VAT)

1 option available

Sealevel 2103 Series

1 Port Isolated RS-232 (DB25) Serial to USB Adapter

From £114.00 (exc. VAT)

1 option available

Sealevel 2102 Series

1 Port RS-422/485/530 (DB25) Serial to USB Adapter

From £159.00 (exc. VAT)

1 option available

Sealevel 2101 Series

1 Port RS-232 (DB25) Serial to USB Adapter

1 option available

Sealevel 170PoE Series

PoE Modbus TCP to 8 A/D – 2 Optically Dry Contact Input – 2 Solid-State Relay Output Adapter

From £303.50 (exc. VAT)

1 option available

Sealevel 170PoE-OEM Series

PoE Modbus TCP to 8 A/D – 2 Optically Dry Contact Input – 2 Solid-State Relay Output Board

From £292.00 (exc. VAT)

1 option available

Sealevel 170E Series

Ethernet Modbus TCP to 8 A/D – 2 Optically Dry Contact Input – 2 Solid-State Relay Output Adapter

From £303.50 (exc. VAT)

1 option available

Sealevel 170E-OEM Series

Ethernet Modbus TCP to 8 A/D – 2 Optically Dry Contact Input – 2 Solid-State Relay Output Board

From £292.00 (exc. VAT)

1 option available

Sealevel 160PoE Series

Ethernet Modbus TCP to 32 Channel TTL Digital I/O Adapter

From £253.50 (exc. VAT)

1 option available

Sealevel 160PoE-OEM Series

Ethernet Modbus TCP to 32 Channel TTL Digital I/O Board

1 option available

Sealevel 160E Series

Ethernet Modbus TCP to 32 Channel TTL Digital I/O Adapter

From £215.00 (exc. VAT)

1 option available

Sealevel 160E-OEM Series

Ethernet Modbus TCP to 32 Channel TTL Digital I/O Board

1 option available

Sealevel 150PoE Series

Ethernet Modbus TCP to 4 Form C Relay Output Adapter

From £193.00 (exc. VAT)

1 option available

Sealevel 150E Series

Ethernet Modbus TCP to 4 Form C Relay Output Adapter

From £193.00 (exc. VAT)

1 option available

Sealevel 140PoE Series

Ethernet Modbus TCP to 4 Reed Relay Output Adapter

From £181.50 (exc. VAT)

1 option available

Sealevel 140E Series

Ethernet Modbus TCP to 4 Reed Relay Output Adapter

From £181.50 (exc. VAT)

1 option available

Sealevel 130PoE Series

PoE Modbus TCP to 4 Optically Isolated Digital Input Adapter

From £170.00 (exc. VAT)

1 option available

Sealevel 130E Series

Ethernet Modbus TCP to 4 Optically Isolated Digital Input Adapter

From £170.00 (exc. VAT)

1 option available

Sealevel 120PoE Series

PoE Modbus TCP to 4 Optically Isolated Digital Input/4 Form C Relay Output Adapter

From £263.00 (exc. VAT)

1 option available

Sealevel 120PoE-OEM Series

PoE Modbus TCP to 4 Optically Isolated Digital Input/4 Form C Relay Output Board

From £244.50 (exc. VAT)

1 option available

Sealevel 120E Series

Ethernet Modbus TCP to 4 Optically Isolated Digital Input/4 Form C Relay Output Adapter

From £216.00 (exc. VAT)

1 option available

Sealevel 120E-OEM Series

Ethernet Modbus TCP to 4 Optically Isolated Digital Input/4 Form C Relay Output Board

From £204.50 (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

1 option available

Sealevel 440S Series

RS-232 Modbus RTU to 32 Reed Relay Output Adapter

From £304.50 (exc. VAT)

1 option available

Sealevel 440S-OEM Series

RS-232 Modbus RTU to 32 Reed Relay Output OEM Board

From £291.00 (exc. VAT)

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 440M Series

RS-485 Modbus RTU to 32 Reed Relay Output Adapter

From £304.50 (exc. VAT)

1 option available

Sealevel 440M-OEM Series

RS-485 Modbus RTU to 32 Reed Relay Output OEM Board

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 430S Series

RS-232 Modbus RTU to 32 Isolated Digital Input Adapter

From £230.00 (exc. VAT)

1 option available

Sealevel 430S-OEM Series

RS-232 Modbus RTU to 32 Isolated Digital Input OEM Board

From £217.50 (exc. VAT)

1 option available

Sealevel 430N Series

32 Optically Isolated Digital Input SeaI/O Expansion Module

From £230.00 (exc. VAT)

1 option available

Sealevel 430M Series

RS-232 Modbus RTU to 32 Isolated Digital Input Adapter

From £230.00 (exc. VAT)

1 option available

Sealevel 430M-OEM Series

RS-232 Modbus RTU to 32 Isolated Digital Input OEM Board

1 option available

Sealevel 430E Series

Ethernet Modbus TCP to 32 Isolated Digital Input Adapter

From £304.50 (exc. VAT)

Showing 420 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.