The NI FP-TB-3 FieldPoint Terminal Base is an isothermal terminal base designed for use with National Instruments FieldPoint I/O systems, particularly thermocouple measurements when paired with the FP-TC-120 module. It provides 18 screw terminals—16 numbered terminals and two dedicated C (common) channel terminals—for secure signal termination and power distribution in industrial environments. Isothermal construction minimizes temperature gradients across terminals, enhancing accuracy of cold-junction compensation. The terminal base accommodates one 8 or 16 channel FieldPoint module and mounts on standard 35 mm DIN rails or via panel mounting. Keyed design prevents incorrect module installation.
Technical Specifications
• Terminals: 18 screw terminals (16 numbered + 2 C channels)
• Isothermal Construction: Minimizes thermal gradients on I/O terminals
• Wire Gauge: 16–26 AWG copper conductor
• Wire Stripping: 7 mm (0.28 in.) insulation removal required
• Screw Terminal Torque: 0.5–0.6 N·m (4.4–5.3 lb·in.)
• Maximum Total Current: 10 A through V and C terminals combined
• Current Distribution: Single C terminal for return if total draw < 3 A; individual C terminals required if ≥ 3 A
• Operating Temperature: −40 °C to 70 °C
• Dimensions (with module): 107 mm × 109 mm × 91 mm (4.2 in. × 4.3 in. × 3.6 in.)
• Weight: 240 g (8.5 oz)
• Certifications: CE, C-Tick, FCC Part 15 Class A (EN 55011 Class A at 10 m, FCC Part 15A above 1 GHz); Immunity per EN 61326:1997 + A2:2001, Table 1
– Key Features
• Isothermal design for enhanced thermocouple cold-junction compensation accuracy
• Keyed module socket prevents installation errors
• Dual mounting options: 35 mm DIN rail or panel mount
• Supports both 8 and 16 channel modules
• Field-wiring termination via screw terminals with specified torque parameters
– Compatibility & Integration
Primarily designed for the FP-TC-120 thermocouple module. Compatible with other FieldPoint I/O modules that do not require external power and utilize terminals 1 to 16. EMC compliance requires shielded cabling.
