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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Sealevel Products

Showing 120 of 428 Sealevel Products items

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540N
Sealevel 540N
32 Open-Collector Output SeaI/O Expansion Module
£378.00
520M-OEM
Sealevel 520M-OEM
RS-485 Modbus RTU to 8 Isolated Digital Input/8 High Current Form C Relay Output OEM Board
£266.50
463S-OEM
Sealevel 463S-OEM
RS-232 Modbus RTU to 96 Channel TTL Digital I/O OEM Board
£257.50
110PoE
Sealevel 110PoE
PoE Modbus TCP to 4 Optically Isolated Digital Input/4 Reed Relay Output Adapter
£204.50
110E
Sealevel 110E
Ethernet Modbus TCP to 4 Optically Isolated Digital Input/4 Reed Relay Output Adapter
£204.50
520S-OEM
Sealevel 520S-OEM
RS-232 Modbus RTU to 8 Isolated Digital Input/8 High Current Form C Relay Output OEM Board
£266.50
540E
Sealevel 540E
Ethernet Modbus TCP to 32 Open-Collector Output Adapter
£453.00
130E
Sealevel 130E
Ethernet Modbus TCP to 4 Optically Isolated Digital Input Adapter
£170.00
150PoE
Sealevel 150PoE
Ethernet Modbus TCP to 4 Form C Relay Output Adapter
£193.00
570M
Sealevel 570M
RS-485 Modbus RTU to 8 Analog Input – 8 Isolated Digital Input/8 Form C Relay Output Adapter
£403.00
687U
Sealevel 687U
8 Port RS-232/485 (RJ45) Versacom Serial to USB Adapter
£530.00
580PoE
Sealevel 580PoE
Ethernet Modbus TCP to 32 Isolated Dry-Contact Inputs
£637.50
120PoE
Sealevel 120PoE
PoE Modbus TCP to 4 Optically Isolated Digital Input/4 Form C Relay Output Adapter
£263.00
130PoE
Sealevel 130PoE
PoE Modbus TCP to 4 Optically Isolated Digital Input Adapter
£170.00
140PoE
Sealevel 140PoE
Ethernet Modbus TCP to 4 Reed Relay Output Adapter
£181.50
647U
Sealevel 647U
4 Port RS-232/485 (RJ45) Versacom Serial to USB Adapter
£378.00
140E
Sealevel 140E
Ethernet Modbus TCP to 4 Reed Relay Output Adapter
£181.50
DR105
Sealevel DR105
DIN Rail Mounting Clips
£15.50
DR102
Sealevel DR102
DIN Rail Mounting Clips
£39.50
2113
Sealevel 2113
1 Port Isolated RS-232/422/485 (DB9) Serial to USB Adapter
£179.00
2107
Sealevel 2107
1 Port RS-485 (DB9) Serial to USB Adapter
£93.00
160PoE
Sealevel 160PoE
Ethernet Modbus TCP to 32 Channel TTL Digital I/O Adapter
£253.50
2123
Sealevel 2123
1 Port RS-232/422/485 (DB9) Serial to USB Adapter
£169.00
2402
Sealevel 2402
4 Port RS-422/485 (DB9) Serial to USB Adapter
£196.50
2201
Sealevel 2201
2 Port RS-232 (DB9) Serial to USB Adapter
£149.50
2223-OEM
Sealevel 2223-OEM
2 Port RS-232/422/485 (DB9) OEM Serial to USB Board
£185.00
2202
Sealevel 2202
2 Port RS-422/485 DB9 Serial to USB Adapter
£230.00
170PoE
Sealevel 170PoE
PoE Modbus TCP to 8 A/D – 2 Optically Dry Contact Input – 2 Solid-State Relay Output Adapter
£303.50
2223
Sealevel 2223
2 Port RS-232/422/485 DB9 Serial to USB Adapter
£184.00
170E-OEM
Sealevel 170E-OEM
Ethernet Modbus TCP to 8 A/D – 2 Optically Dry Contact Input – 2 Solid-State Relay Output Board
£292.00
2228
Sealevel 2228
2 Port RS-232/422/485 (DB9) Software Configurable Serial to USB Adapter Board – PC Bracket
£173.00
2103
Sealevel 2103
1 Port Isolated RS-232 (DB25) Serial to USB Adapter
£114.00
2108
Sealevel 2108
1 Port RS-232 (DB9) Serial to USB Adapter Board – PC Bracket
£76.50
2803
Sealevel 2803
8 Port RS-232/422/485 (DB9) Serial to USB Adapter
£524.00
410S-OEM
Sealevel 410S-OEM
RS-232 Modbus RTU to 16 Isolated Digital Input/16 Reed Relay Output OEM Board
£242.00
410E
Sealevel 410E
Ethernet Modbus TCP to 16 Isolated Digital Input/16 Reed Relay Output Adapter
£329.00
430E
Sealevel 430E
Ethernet Modbus TCP to 32 Isolated Digital Input Adapter
£304.50
420M
Sealevel 420M
RS-485 Modbus RTU to 16 Isolated Digital Input/8 Form C Relay Output Adapter
£266.50
430M
Sealevel 430M
RS-232 Modbus RTU to 32 Isolated Digital Input Adapter
£230.00
2208
Sealevel 2208
2 Port RS-232 (DB9) Serial to USB Adapter Board – PC Bracket
£140.50
2105R
Sealevel 2105R
1 Port RS-232 (DB9) Serial to USB Adapter
£90.00
430N
Sealevel 430N
32 Optically Isolated Digital Input SeaI/O Expansion Module
£230.00
420S-OEM
Sealevel 420S-OEM
RS-232 Modbus RTU to 16 Isolated Digital Input/8 Form C Relay Output OEM Board
£254.50
420S
Sealevel 420S
RS-232 Modbus RTU to 16 Isolated Digital Input/8 Form C Relay Output Adapter
£266.50
430W
Sealevel 430W
Wireless 802.11b/g Modbus TCP to 32 Isolated Digital Input Adapter
£329.00
420E-OEM
Sealevel 420E-OEM
Ethernet Modbus TCP to 16 Isolated Digital Input/8 Form C Relay Output OEM Board
£329.00
470M-OEM
Sealevel 470M-OEM
RS-485 Modbus RTU to 16 Analog Input/2 Analog Output – 8 Isolated Digital Input/8 Digital Output OEM Board
£452.00
450M
Sealevel 450M
RS-485 Modbus RTU to 16 Form C Relay Output Adapter
£280.00
450E-OEM
Sealevel 450E-OEM
Ethernet Modbus TCP to 16 Form C Relay Output OEM Board
£340.50
450S-OEM
Sealevel 450S-OEM
RS-232 Modbus RTU to 16 Form C Relay Output OEM Board
£266.50
462W
Sealevel 462W
Wireless 802.11b/g Modbus TCP to 96 Channel TTL DB78F Digital I/O Adapter
£366.00
440E-OEM
Sealevel 440E-OEM
Ethernet Modbus TCP to 32 Reed Relay Output OEM Board
£366.00
450M-OEM
Sealevel 450M-OEM
RS-485 Modbus RTU to 16 Form C Relay Output OEM Board
£266.50
470M
Sealevel 470M
RS-485 Modbus RTU to 16 Analog Input/2 Analog Output – 8 Isolated Digital Input/8 Digital Output Adapter
£465.50
450N
Sealevel 450N
16 Form C Relay Output SeaI/O Expansion Module
£266.50
450S
Sealevel 450S
RS-232 Modbus RTU to 16 Form C Relay Output Adapter
£280.00
440M
Sealevel 440M
RS-485 Modbus RTU to 32 Reed Relay Output Adapter
£304.50
463M-OEM
Sealevel 463M-OEM
RS-485 Modbus RTU to 96 Channel TTL Digital I/O OEM Board
£239.00
470S
Sealevel 470S
RS-232 Modbus RTU to 16 Analog Input/2 Analog Output – 8 Isolated Digital Input/8 Digital Output Adapter
£465.50
110PoE-OEM
Sealevel 110PoE-OEM
PoE Modbus TCP to 4 Optically Isolated Digital Input/4 Reed Relay Output Board
£193.00
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Showing 120 of 428

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.