Anonymous Verified Buyer
" Very responsive and helpful, competitive pricing. Good source! "
July 2025
781349-01
781349-01, 32 Thermocouple Inputs, 8 CJC Channels, TB-4353 Terminal Block
Actual item may vary if no part number is provided on quote request.
✔ 2 Year Warranty Included
✔ Free Domestic Ground Shipping
✔ NIST Calibration Available
Andrew Gar**** Verified Buyer
" Amazing to work with and had my order within 1 week after purchasing with all NI certs and data that were needed. "
March 2025
Said Sai**** Verified Buyer
" Competent contact for highly specialized components. The support team is very knowledgeable. Many thanks for the help and the fast shipping! "
January 2025
Bob C**** Verified Buyer
" Jason was able to get our emergency situation taken care of quickly and professionally. "
May 2025
Gregg Flecki**** Verified Buyer
" Great service and great products. This is my 2nd time using Apex Waves, truly impressed. "
January 2025
Carol Zimme**** Verified Buyer
" Very responsive and helpful, competitive pricing. Good source! "
July 2025
Andrew Gar**** Verified Buyer
" Amazing to work with and had my order within 1 week after purchasing with all NI certs and data that were needed. "
March 2025
Said Sai**** Verified Buyer
" Competent contact for highly specialized components. The support team is very knowledgeable. Many thanks for the help and the fast shipping! "
January 2025
Bob C**** Verified Buyer
" Jason was able to get our emergency situation taken care of quickly and professionally. "
May 2025
Gregg Flecki**** Verified Buyer
" Great service and great products. This is my 2nd time using Apex Waves, truly impressed. "
January 2025
National Instruments 781349-01 Terminal Block for PXI Express Thermocouple Input Module
National Instruments part number 781349-01 is an identifying part number of the TB-4353, a Terminal Block designed for the NI PXIe-4353 PXI Express Thermocouple Input Module. The 781349-01 facilitates screw terminal connectivity for up to 32 thermocouple inputs and includes 8 cold-junction compensation (CJC) channels equipped with NTC thermistors, enhancing CJC accuracy for precise temperature measurements.
The 781349-01 terminal block is engineered for use with the NI PXIe-4353 module, which features a ±80 mV maximum voltage measurement range. To ensure compatibility and prevent incorrect connections, the TB-4353 incorporates keying mechanisms. The terminal block also includes a strain-relief mechanism and tie-wrap holes, offering additional strain relief for connected signal wires. For cold-junction compensation, the TB-4353 integrates 8 thermistors that measure the temperature of adjacent screw terminal junctions, with each thermistor corresponding to a subset of thermocouple channels. This design ensures accurate CJC measurements under varying conditions, making it ideal for high-precision temperature monitoring.
The 781349-01 offers a typical CJC accuracy of 0.20°C at 23°C ±5°C, with a maximum of 0.30°C. Across the full operating temperature range of 0°C to 55°C, it maintains a typical accuracy of 0.35°C with a maximum of 0.45°C, supporting wire gauges up to 14 AWG maximum. With dimensions of 5.10 inches (12.95 cm) in height and 6.02 inches (15.28 cm) in width, the TB-4353 is compact and suitable for indoor use only. It is designed for operation at a maximum altitude of 2,000 meters and meets safety and electromagnetic compatibility standards, including IEC 61010-1 for safety and EN 61326-1 for EMC. The terminal block features 300 Vrms channel-to-earth ground isolation under Measurement Category II and comes with a 1-year calibration interval.
| Model | 781349-01 |
|---|---|
| Model Name | TB-4353 |
| Part Type | Terminal Block |
| Number of Thermocouple Inputs | 32 |
| Number of CJC Channels | 8 |
| CJC Accuracy | ±0.20°C at 23°C ±5°C (typical) |
| Temperature Accuracy | ±0.35°C from 0°C to 55°C (typical) |
| Wire Gauge Support | Up to 14 AWG |
| Dimensions | 12.95 cm × 15.28 cm |
| Altitude | Maximum 2,000 meters |
Associated part numbers for 781349-01:
Delivery:
Eligible returns may be accepted within 30 days at Apex Waves’ discretion. A 25% restocking fee applies; non-refundable and built-to-order products are excluded.
Payment:
Receive Price & Availability Today!
Ask About Our Tiered Calibration Levels
Option & Modules:
Confirm Your Requirements or Versions
Cost & Lead Time Available Upon Request for Service
Repair Evaluation: $150
Common Typos:
Why Buy From Apex Waves:
