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 3093 Series

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

1 option available

Sealevel 270U Series

7 Port Isolated Industrial USB 2.0 Hub

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 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)

1 option available

Sealevel 430E-OEM Series

Ethernet Modbus TCP to 32 Isolated Digital Input OEM Board

1 option available

Sealevel 110PoE Series

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

From £204.50 (exc. VAT)

1 option available

Sealevel 110PoE-OEM Series

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

From £193.00 (exc. VAT)

1 option available

Sealevel 110E Series

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

From £204.50 (exc. VAT)

1 option available

Sealevel 110E-OEM Series

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

From £193.00 (exc. VAT)

1 option available

Sealevel 410S-OEM Series

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

From £242.00 (exc. VAT)

1 option available

Sealevel 570W Series

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

From £502.00 (exc. VAT)

1 option available

Sealevel 570S Series

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

From £403.00 (exc. VAT)

1 option available

Sealevel 570N Series

8 Analog Input – 8 Isolated Digital Input/8 Form C Relay Output SeaI/O Expansion Module

From £403.00 (exc. VAT)

1 option available

Sealevel 570M Series

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

From £403.00 (exc. VAT)

1 option available

Sealevel 540W Series

Wireless 802.11b/g Modbus TCP to 32 Open-Collector Output Adapter

From £477.50 (exc. VAT)

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 470S Series

RS-232 Modbus RTU to 16 Analog Input/2 Analog Output – 8 Isolated Digital Input/8 Digital Output Adapter

From £465.50 (exc. VAT)

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 470M Series

RS-485 Modbus RTU to 16 Analog Input/2 Analog Output – 8 Isolated Digital Input/8 Digital Output Adapter

From £465.50 (exc. VAT)

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 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 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 470S-OEM Series

RS-232 Modbus RTU to 16 Analog Input/2 Analog Output – 8 Isolated Digital Input/8 Digital Output OEM Board

From £452.00 (exc. VAT)

1 option available

Sealevel 470M-OEM Series

RS-485 Modbus RTU to 16 Analog Input/2 Analog Output – 8 Isolated Digital Input/8 Digital Output OEM Board

From £452.00 (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 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-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)

Sealevel SS-DB25-ROHS

DB25 Female to DB25 Male - Serial Surge Suppressor

Sealevel SS-DB9-ROHS

DB9 Female to DB9 Male - Serial Surge Suppressor

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.