DS3800HLOC1A1B Mark VI | GE Speedtronic I/O OEM Part

Description

Product Introduction

The GE DS3800HLOC1A1B is a fully populated I/O link card from the Mark VI Speedtronic series, combining low-level millivolt input capability with factory-optimized jumper settings for Type J thermocouples, integrated cold-junction compensation, and internal IONet termination. This variant is specifically engineered for exhaust gas temperature monitoring and other thermocouple-based applications requiring accurate measurement with simplified end-of-chain installation.

What distinguishes the 1A1B suffix is its factory-set jumper configuration that enables Type J thermocouple operation with cold-junction compensation on all eight analog channels, while the ‘C’ in the base model provides internal IONet termination. The first ‘A’ specifies Type J thermocouple configuration, and the second ‘B’ confirms internal termination is active. For gas turbine installations monitoring combustion temperatures (typically up to 760°C with Type J sensors) at end-of-chain positions, the HLOC1A1B provides accurate temperature measurement with built-in termination, eliminating the need for external signal conditioners or network terminators. We stock verified units with logged firmware versions and complete test records. No rework, no counterfeit—just OEM-spec hardware ready for deployment.

Key Technical Specifications

Key Selling Points & Differentiators

• Eight Type J Thermocouple Channels: All eight analog inputs dedicated to Type J thermocouples with onboard cold-junction compensation—eliminates the need for external transmitters or signal conditioners.
• Integrated Cold-Junction Compensation: Onboard precision temperature sensor provides automatic CJC—eliminates external reference junctions and manual temperature calculations.
• Built-In IONet Termination: Internal 120 Ω resistor factory-enabled—ideal for end-of-chain installations, simplifying rack wiring.
• Low Noise Performance: < 2 µV RMS input noise ensures accurate temperature measurement across the full Type J range.
• Full Factory Test: Every unit undergoes a 24-hour burn-in with live I/O loopback, precision microvolt source calibration (spanning Type J range from –40°C to +760°C), cold-junction compensation verification, and communication handshake validation—includes signed QC report with measured values for all channels.
• 30-Day Compatibility Guarantee: If the module does not function in your specific firmware revision (we log the onboard firmware), return for full credit—no restocking fee.
• Anti-Counterfeit Sealed: Each DS3800HLOC1A1B ships with tamper-evident packaging and visual inspection photos taken at receipt.
• Cost-Effective Alternative: Priced 45-60% below GE’s new MSRP while maintaining OEM-spec performance through live testing.

Frequently Asked Questions (FAQ)

Can I hot-swap the DS3800HLOC1A1B while the turbine is running?
No—absolutely not. The Mark VI backplane does not support live insertion for this module. You will need a full shutdown and power cycle. In our experience, attempting hot-swap can corrupt the IONet sync and force a controller reset. Always isolate the rack before removal.

What exactly does the 1A1B suffix mean, and does it matter for my application?
Yes, the suffix is critical. The first ‘A’ indicates Type J thermocouple configuration on all eight analog channels with CJC enabled. The second ‘B’ confirms the IONet port has internal termination active. If your temperature sensors are Type K or T, you’ll need to either reconfigure jumpers (we can provide the map) or select a different variant. If your board sits in the middle of the IONet network, this board’s internal termination would cause double-termination—this variant should only be used at end positions.

Will this board work as a direct replacement for a DS3800HLOC?
Electrically and functionally, yes—the HLOC1A1B provides the same core functionality with factory-optimized jumper settings. The standard HLOC comes with all channels in a default, unconfigured state—you set them up in the field. The 1A1B comes pre-configured for Type J thermocouples on all channels. If your existing HLOC was configured the same way, this is a direct drop-in. If not, you’ll need to match your existing jumper settings.

How do I verify if this board matches my existing firmware revision?
We log the firmware version from every unit during our inbound test. Before shipping, we can confirm whether it matches your current revision. This is particularly important for thermocouple boards because the linearization coefficients for Type J changed slightly between firmware revisions to align with the NIST ITS-90 standard. A mismatch can cause a +1.2°C offset at 700°C—significant for turbine efficiency calculations. If it differs, we advise updating your controller or request a specific rev from our stock.

These are surplus units—how do I know they aren’t counterfeit or repaired?
We maintain full traceability: every DS3800HLOC1A1B is photographed upon receipt, cross-checked against GE’s OEM marking guide (including board revision, date code, and component-level verification), and tested for electrical characteristics (insulation > 10 MΩ, current draw within 5% of spec). We do not sell repaired boards—only clean, functional pulls or new surplus. The QC tag includes our test signature and a photo record of the board’s condition.

What happens if the board fails after installation?
Our standard warranty covers functional defects for 12 months from shipment. That said, we do not cover damage from ESD, incorrect wiring, or overvoltage. To be frank, we’ve seen more thermocouple input failures from improper extension wire than from board defects. Using copper wire instead of Type J thermocouple extension cable creates a secondary junction that can induce up to 3°C of error. We include a quick-reference wiring guide with every shipment and recommend using shielded, jacketed extension cable rated for the ambient temperature range. Ground the shield only at the source end.

Is programming or configuration required, or is it plug-and-play?
It’s “plug-and-play” only if your IONet configuration already expects an HLOC1A1B at that slot address and your field sensors are all Type J thermocouples. Otherwise, you must reconfigure the I/O map in the CIMPLICITY or Toolbox software to define the thermocouple type and engineering units. The board stores no user program—all logic resides in the controller. You will not lose turbine sequences by swapping this board. The CJC calibration values are stored onboard, so temperature readings remain accurate without recalibration.

What shipping and packaging precautions do you take?
Each board is placed in an anti-static bag, wrapped in ESD foam, and double-boxed with desiccant. Low-level analog cards with precision CJC sensors are extremely sensitive to moisture and contamination—we seal the inner bag with a tamper-evident label, include a humidity indicator card, and use anti-corrosion packaging. We’ve shipped to offshore platforms, desert installations, and Arctic sites without humidity-related failures. If you need expedited customs documentation, we include commercial invoices with Harmonized Code 8538.90.8160.

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