Please note that we will be closed for the holiday period starting from 24th December, and will reopen on 2nd January 2026. Our last shipping dates to customers this year will be - UK Mainland: 22/12/2025. Highlands/2-day carriage: 18/12/2025. FedEx Priority: 16/12/2025. FedEx Economy: 15/12/2025.

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 60 of 428 Sealevel Products items

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6510-ROHS
Sealevel 6510-ROHS
SeaRAQ 8x Channel-to-Channel Isolated A/D Inputs Expansion Module
647U
Sealevel 647U
4 Port RS-232/485 (RJ45) Versacom Serial to USB Adapter
£378.00
641U
Sealevel 641U
4 Port RS-232 (RJ45) Serial to USB Adapter
580PoE
Sealevel 580PoE
Ethernet Modbus TCP to 32 Isolated Dry-Contact Inputs
£637.50
580E
Sealevel 580E
Ethernet Modbus TCP to 32 Isolated Dry-Contact Inputs
£637.50
570U
Sealevel 570U
USB Modbus RTU to 8 Analog Input – 8 Isolated Digital Input/8 Form C Relay Output Adapter
540U
Sealevel 540U
USB Modbus RTU to 32 Open-Collector Output Adapter
540U-OEM
Sealevel 540U-OEM
USB Modbus RTU to 32 Open-Collector Output OEM Board
540S
Sealevel 540S
RS-232 Modbus RTU to 32 Open-Collector Output Adapter
£378.00
540S-OEM
Sealevel 540S-OEM
RS-232 Modbus RTU to 32 Open-Collector Output OEM Board
£366.00
540N
Sealevel 540N
32 Open-Collector Output SeaI/O Expansion Module
£378.00
540M
Sealevel 540M
RS-485 Modbus RTU to 32 Open-Collector Output Adapter
£378.00
540M-OEM
Sealevel 540M-OEM
RS-485 Modbus RTU to 32 Open-Collector Output OEM Board
£366.00
540E
Sealevel 540E
Ethernet Modbus TCP to 32 Open-Collector Output Adapter
£453.00
540E-OEM
Sealevel 540E-OEM
Ethernet Modbus TCP to 32 Open-Collector Output OEM Board
£439.50
5402e
Sealevel 5402e
4 Port RS-232/422/485/530/530A/V.35 PCI Express Synchronous Serial Card
£1,473.00
5402
Sealevel 5402
4 Port RS-232/422/485/530/530/V.35 Synchronous Serial PCI Card
£1,161.50
530W
Sealevel 530W
Wireless 802.11b/g Modbus TCP to 16 Isolated Digital Input/16 Open-Collector Output Adapter
£526.50
530U
Sealevel 530U
USB Modbus RTU to 16 Isolated Digital Input/16 Open-Collector Output Adapter
530U-OEM
Sealevel 530U-OEM
USB Modbus RTU to 16 Isolated Digital Input/16 Open-Collector Output OEM Board
530S
Sealevel 530S
RS-232 Modbus RTU to 16 Isolated Digital Input/16 Open-Collector Output Adapter
£428.50
530S-OEM
Sealevel 530S-OEM
RS-232 Modbus RTU to 16 Isolated Digital Input/16 Open-Collector Output OEM Board
£415.00
530N
Sealevel 530N
16 Isolated Digital Input/16 Open-Collector Output SeaI/O Expansion Module
£428.50
530M
Sealevel 530M
RS-485 Modbus RTU to 16 Isolated Digital Input/16 Open-Collector Output Adapter
£428.50
530M-OEM
Sealevel 530M-OEM
RS-485 Modbus RTU to 16 Isolated Digital Input/16 Open-Collector Output OEM Board
£415.00
530E
Sealevel 530E
Ethernet Modbus TCP to 16 Isolated Digital Input/16 Open-Collector Output Adapter
£502.00
530E-OEM
Sealevel 530E-OEM
Ethernet Modbus TCP to 16 Isolated Digital Input/16 Open-Collector Output OEM Board
£489.00
520W
Sealevel 520W
Wireless 802.11b/g Modbus TCP to 8 Isolated Digital Input/8 High Current Form C Relay Output Adapter
£378.00
520U
Sealevel 520U
USB Modbus RTU to 8 Isolated Digital Input/8 High Current Form C Relay Output Adapter
520U-OEM
Sealevel 520U-OEM
USB Modbus RTU to 8 Isolated Digital Input/8 High Current Form C Relay Output OEM Board
520S
Sealevel 520S
RS-232 Modbus RTU to 8 Isolated Digital Input/8 High Current Form C Relay Output Adapter
£280.00
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
520N
1 in stock
Sealevel 520N
8 Optically Isolated Input/8 High-Current Form C Relay Output SeaI/O Expansion Module
£280.00
520M
Sealevel 520M
RS-485 Modbus RTU to 8 Isolated Digital Input/8 High Current Form C Relay Output Adapter
£280.00
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
520E-OEM
Sealevel 520E-OEM
Ethernet Modbus TCP to 8 Isolated Digital Input/8 High Current Form C Relay Output OEM Board
£340.50
5104e
Sealevel 5104e
1 Port RS-232/422/485/530/530A/V.35 Low Profile PCI Express Synchronous Serial Card
£584.50
5104
Sealevel 5104
1 Port RS-232/422/485/530/530A/V.35 Low Profile PCI Synchronous Serial Card
5103e
Sealevel 5103e
1 Port RS-232 Low Profile PCI Express Synchronous Serial Card
£453.50
5103
Sealevel 5103
1 Port RS-232 Low Profile PCI Synchronous Serial Card
5102e
Sealevel 5102e
1 Port RS-232/422/485/530/530A/V.35 Low Profile PCI Express Synchronous Serial Card
£534.00
5102
Sealevel 5102
1 Port RS-232/422/485/530/530A/V.35 Low Profile PCI Synchronous Serial Card
4803
Sealevel 4803
8 Port RS-232/422/485 Ethernet Serial Device Server
4802
Sealevel 4802
8 Port RS-422/485 Ethernet Serial Device Server
4801
Sealevel 4801
8 Port RS-232 Ethernet Serial Device Server
470U
Sealevel 470U
USB Modbus RTU to 16 Analog Input/2 Analog Output – 8 Isolated Digital Input/8 Digital Output Adapter
470U-OEM
Sealevel 470U-OEM
USB Modbus RTU to 16 Analog Input/2 Analog Output – 8 Isolated Digital Input/8 Digital Output OEM Board
463W
Sealevel 463W
Wireless 802.11b/g Modbus TCP to 96 Channel TTL Digital I/O Adapter
£329.00
463U
Sealevel 463U
USB Modbus RTU to 96 Channel TTLDigital I/O Adapter
463U-OEM
Sealevel 463U-OEM
USB Modbus RTU to 96 Channel TTLDigital I/O OEM Board
463S
Sealevel 463S
RS-232 Modbus RTU to 96 Channel TTL Digital I/O Adapter
£283.00
463S-OEM
Sealevel 463S-OEM
RS-232 Modbus RTU to 96 Channel TTL Digital I/O OEM Board
£257.50
463N
Sealevel 463N
96 Channel TTL Digital Interface SeaI/O Expansion Module
£281.00
463M
Sealevel 463M
RS-485 Modbus RTU to 96 Channel TTL Digital I/O Adapter
£264.50
463M-OEM
Sealevel 463M-OEM
RS-485 Modbus RTU to 96 Channel TTL Digital I/O OEM Board
£239.00
463E
Sealevel 463E
Ethernet Modbus TCP to 96 Channel TTL Digital I/O Adapter
£358.00
463E-OEM
Sealevel 463E-OEM
Ethernet Modbus TCP to 96 Channel TTL Digital I/O OEM Board
£332.00
462W
Sealevel 462W
Wireless 802.11b/g Modbus TCP to 96 Channel TTL DB78F Digital I/O Adapter
£366.00
462U-OEM
Sealevel 462U-OEM
USB Modbus RTU to 96 Channel TTLDigital I/O OEM Board
462U
1 in stock
Sealevel 462U
USB Modbus RTU to 96 Channel TTL – DB78F Digital I/O Adapter – SeaI/O-462U
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Showing 60 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.