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 240 of 428 Sealevel Products items

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7104
Sealevel 7104
1 Port RS-232 Low Profile PCI Serial Card
£445.00
687U
Sealevel 687U
8 Port RS-232/485 (RJ45) Versacom Serial to USB Adapter
£530.00
681U
Sealevel 681U
8 Port RS-232 (RJ45) Serial to USB Adapter
£513.00
6520-ROHS
Sealevel 6520-ROHS
SeaRAQ 8x Channel Isolated 4-20 mA Current Loop Transmitter Outputs Expansion Module
6512-ROHS
Sealevel 6512-ROHS
SeaRAQ 6x Isolated Thermocouple Inputs (Type E, J, or K) Expansion Module
6511-ROHS
Sealevel 6511-ROHS
SeaRAQ 6x Isolated RTD Analog Inputs Expansion Module
CA167-ROHS
Sealevel CA167-ROHS
100cm 50-Pin IDC to 50-Pin IDC Ribbon Cable
£20.50
CA159-ROHS
Sealevel CA159-ROHS
182cm DB25F RS-530 to DB15 Male X.21 Cable
CA152-ROHS
Sealevel CA152-ROHS
20cm 10-Pin IDC Ribbon Cable to DB9M
CA143-ROHS
Sealevel CA143-ROHS
91cm DB37F to 4x DB9M Cable
CA140-ROHS
Sealevel CA140-ROHS
DB25F to DB9M RS-232 Converter
CA135-ROHS
Sealevel CA135-ROHS
100cm 50-Pin IDC to 50-Pin Edge Connector Ribbon Cable
£52.50
CA127-ROHS
Sealevel CA127-ROHS
182cm DB9F to DB9M Extension Cable
CA118-ROHS
Sealevel CA118-ROHS
20cm 26-Pin IDC Ribbon to DB25M Cable
CA112-ROHS
Sealevel CA112-ROHS
182cm DB37M to DB37F Extension Cable
CA110-ROHS
Sealevel CA110-ROHS
15cm 40-Pin IDC Ribbon Cable to DB37M
CA107-ROHS
Sealevel CA107-ROHS
25cm DB25F RS-530 to DB37M RS-449 DTE Cable
CA104-ROHS
Sealevel CA104-ROHS
182cm DB25F to DB25M Extension Cable
9065
Sealevel 9065
ACC-188 USB Synchronous Serial Radio Adapter
9064
Sealevel 9064
ACC-188 PCMCIA Synchronous Serial Radio Adapter
430E
Sealevel 430E
Ethernet Modbus TCP to 32 Isolated Digital Input Adapter
£304.50
430E-OEM
Sealevel 430E-OEM
Ethernet Modbus TCP to 32 Isolated Digital Input OEM Board
4220-ROHS
Sealevel 4220-ROHS
2-Port Ethernet Surge Suppressor
420W
Sealevel 420W
Wireless 802.11b/g Modbus TCP to 16 Isolated Digital Input/8 Form C Relay Output Adapter
£366.00
420U
Sealevel 420U
USB Modbus RTU to 16 Isolated Digital Input/8 Form C Relay Output Adapter
420U-OEM
Sealevel 420U-OEM
USB Modbus RTU to 16 Isolated Digital Input/8 Form C Relay Output OEM Board
420S
Sealevel 420S
RS-232 Modbus RTU to 16 Isolated Digital Input/8 Form C Relay Output Adapter
£266.50
420S-OEM
Sealevel 420S-OEM
RS-232 Modbus RTU to 16 Isolated Digital Input/8 Form C Relay Output OEM Board
£254.50
420N
Sealevel 420N
16 Optically Isolated Digital Input/8 Form C Relay Output SeaI/O Expansion Module
£266.50
420M
Sealevel 420M
RS-485 Modbus RTU to 16 Isolated Digital Input/8 Form C Relay Output Adapter
£266.50
420M-OEM
Sealevel 420M-OEM
RS-485 Modbus RTU to 16 Isolated Digital Input/8 Form C Relay Output OEM Board
£254.50
420E
Sealevel 420E
Ethernet Modbus TCP to 16 Isolated Digital Input/8 Form C Relay Output Adapter
£340.50
420E-OEM
Sealevel 420E-OEM
Ethernet Modbus TCP to 16 Isolated Digital Input/8 Form C Relay Output OEM Board
£329.00
4203
Sealevel 4203
2 Port RS-232/422/485 Ethernet Serial Device Server
4202
Sealevel 4202
2 Port RS-422/485 Ethernet Serial Device Server,
4201
Sealevel 4201
2 Port RS-232 Ethernet Serial Device Server
4163
Sealevel 4163
16 Port RS-232/422/485 Ethernet Serial Device Server
4162
Sealevel 4162
16 Port RS-422/485 Ethernet Serial Device Server
4161
Sealevel 4161
16 Port RS-232 Ethernet Serial Device Server
410W
Sealevel 410W
Wireless 802.11b/g Modbus TCP to 16 Isolated Digital Input/16 Reed Relay Output Adapter
£353.50
410U
Sealevel 410U
USB Modbus RTU to 16 Isolated Digital Input/16 Reed Relay Output Adapter
410U-OEM
Sealevel 410U-OEM
USB Modbus RTU to 16 Isolated Digital Input/16 Reed Relay Output OEM Board
410S
Sealevel 410S
RS-232 Modbus RTU to 16 Isolated Digital Input/16 Reed Relay Output Adapter
£254.50
410S-OEM
Sealevel 410S-OEM
RS-232 Modbus RTU to 16 Isolated Digital Input/16 Reed Relay Output OEM Board
£242.00
410N
Sealevel 410N
16 Optically Isolated Digital Input/16 Reed Relay Output SeaI/O Expansion Module
£254.50
410M
Sealevel 410M
RS-485 Modbus RTU to 16 Isolated Digital Input/16 Reed Relay Output Adapter
£254.50
410M-OEM
Sealevel 410M-OEM
RS-485 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
410E-OEM
Sealevel 410E-OEM
Ethernet Modbus TCP to 16 Isolated Digital Input/16 Reed Relay Output OEM Board
£316.00
4104
Sealevel 4104
1 Port RS-232/422/485 Ethernet Serial Device Server
4103
Sealevel 4103
1 Port Isolated RS-232/422/485 Ethernet Serial Device Server
440S
Sealevel 440S
RS-232 Modbus RTU to 32 Reed Relay Output Adapter
£304.50
440S-OEM
Sealevel 440S-OEM
RS-232 Modbus RTU to 32 Reed Relay Output OEM Board
£291.00
440N
Sealevel 440N
32 Reed Relay Output SeaI/O Expansion Module – board only
£291.00
440M
Sealevel 440M
RS-485 Modbus RTU to 32 Reed Relay Output Adapter
£304.50
440M-OEM
Sealevel 440M-OEM
RS-485 Modbus RTU to 32 Reed Relay Output OEM Board
£291.00
440E
Sealevel 440E
Ethernet Modbus TCP to 32 Reed Relay Output Adapter
£378.00
440E-OEM
Sealevel 440E-OEM
Ethernet Modbus TCP to 32 Reed Relay Output OEM Board
£366.00
4403
Sealevel 4403
4 Port RS-232/422/485 Ethernet Serial Device Server
4402
Sealevel 4402
4 Port RS-422/485 Ethernet Serial Device Server
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Showing 240 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.