BTU 5203376 OT-II 349 12-Channel Thermocouple Over Temperature Unit Ethernet 24V

BTU 5203376 OT-II 349 12-Channel Thermocouple Over Temperature Unit Ethernet 24V

The BTU International 5203376 OT-II (349) is a 12-channel thermocouple over-temperature monitoring unit designed for use in BTU reflow ovens and industrial furnace control systems. It monitors up to 12 independent thermocouple inputs simultaneously and provides over-temperature protection signaling through its network and hardwired connections. The unit operates on 24V DC and communicates via a built-in Ethernet network port for integration with furnace control networks.

Specifications & What's Included

• Manufacturer: BTU International
• Part Number: 5203376
• Model: OT-II (349), Secondary Model: 3214
• Assembly Revision: BLS Assy. Rev E
• Type: Over Temperature Monitoring Unit
• Number of Channels: 12 (CH1–CH12)
• Thermocouple Input Type: Selectable via front-panel TC Type Selection switch (supports multiple TC types including J, K, T, E, B, S, C)
• Power: 24V DC
• Connectivity: 1 Ethernet Network Port
• Connection Slots: 3
• Front Panel: 12 individual channel status LEDs, Power indicator LED, Reset button, TC Type Selection switch
• Terminal Connections: Green screw-terminal blocks on front and rear edges (24V+, 24V-, NO, NC, COM, and per-channel inputs)
• Form Factor: Compact panel-mount / DIN-rail compatible module with integrated mounting brackets
• Certifications: UL Listed, CE (Open-Type Process Control Equipment)
• Item includes: OT-II unit only

Applications

The BTU OT-II Over Temperature Unit is a safety and process control module used in BTU International reflow soldering ovens and convection furnace systems. In these systems, it acts as a watchdog for zone temperatures — monitoring each thermocouple zone and triggering an alarm or shutdown signal if any zone exceeds its programmed over-temperature threshold, protecting both the product being processed and the furnace itself. The Ethernet port allows the OT-II to communicate over the furnace's control network, enabling centralized monitoring and logging. This type of module is typically found in SMT (surface mount technology) PCB assembly lines and electronics manufacturing facilities running BTU furnaces. Facilities maintaining or refurbishing BTU reflow ovens — including contract manufacturers, electronics repair shops, and surplus equipment integrators — commonly source these replacement modules to keep older BTU systems operational without full equipment replacement.