Product Details
The Honeywell 51301880-100, also cataloged as the 51301880-100 Thermocouple Multiplexer Terminal Board, operates as a dedicated hardware component for low-millivolt signal termination and field thermocouple signal conditioning within Honeywell LE PIU, Experion PKS, and TDC 3000 network platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 51301880-100 |
| Brand | Honeywell |
| Origin | USA |
| Weight | 1.6 lbs |
| Dimensions | Standard terminal board footprint |
| Operating Temp | 0 to +60 deg C |
| Power Consumption | Passive field termination assembly |
| Board Assembly Reference | 51301881-100 Rev E |
| Function | Thermocouple Multiplexer Terminal Board |
| Signal Input Type | Low-millivolt Thermocouple Signals |
| Input Capacity | Up to 16 thermocouple inputs (with relay board) |
| Cold Junction Compensation | Integrated Cold Junction Reference (CJR) |
| Mounting Type | Panel or rack-mounted |
| Field Wiring Interface | Screw terminals |
| PCB Construction | Industrial-grade PCB with protective conformal coating |
Cold Junction Compensation and Channel-to-Channel Isolation
The board features an integrated Cold Junction Reference (CJR) block designed to perform precise temperature compensation directly at the field wiring interface point. Internal channel-to-channel isolation pathways decoupling thermocouple signals reduce ground loop interference and mitigate common-mode noise across all 16 input channels. The circuit board layout maintains thermoelectric EMF stability before routing multiplexed analog voltage signals through 4-20 mA HART and millivolt processing stages within the host system card cage.
Frequently Asked Questions
Q: How is thermal gradient error minimized across the field terminal blocks?
A: Cold Junction Compensation (CJC) thermistor circuitry is embedded in close physical proximity to the screw terminal rows, continuously measuring local block temperature to correct millivolt offset calculations in real time.
Q: Does the terminal board require an external power supply for signal processing?
A: No, the 51301880-100 is a passive field interface board that draws required reference voltage directly from the interconnected low-energy Process Interface Unit (LE PIU) or relay card assembly.
Field Installation Guidelines
- Mount the assembly on a flat enclosure panel or standard rack frame using ground-bonded mounting hardware to establish continuous earth ground.
- Route thermocouple extension wire pairs directly to designated terminal screw blocks, taking care to observe correct wire polarity (+ and - leads) for the specified thermocouple type.
- Ensure shield drain wires are tied to the local grounding bar at one point only to avoid introducing ground loops into millivolt signal paths.
- Verify all terminal block screws are torqued according to cabinet wiring standards to prevent resistance shifts at contact points.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
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