GE DS3800HLOC | IS200 I/O Link Card Fast Shipping

Description

Product Introduction

The GE DS3800HLOC is a fully populated I/O link card from the Mark VI Speedtronic series, engineered for low-level analog signals with integrated cold-junction compensation for direct thermocouple interfacing and internal IONet termination. This variant provides eight analog input channels with high-gain differential amplifiers optimized for thermocouple signals, combined with onboard temperature reference for accurate cold-junction compensation.

What distinguishes the HLOC is its factory-installed cold-junction compensation circuitry—the ‘C’ suffix indicates an internal 120 Ω IONet termination resistor and factory-configuration for thermocouple input with onboard cold-junction reference. The onboard precision temperature sensor (accurate to ±0.5°C) provides automatic cold-junction compensation, eliminating the need for external reference junctions or manual temperature adjustments. For applications requiring direct thermocouple connection at end-of-chain positions, the HLOC delivers accurate temperature measurement without external signal conditioners or ice baths. 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

• 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—eliminates the need for external terminators on end-of-chain installations.
• Direct Thermocouple Interface: Handles J, K, and T thermocouples directly without external transmitters or signal conditioners.
• Low Noise Performance: < 2 µV RMS input noise ensures accurate temperature measurement, particularly at low signal levels.
• Simplified Field Installation: One less component to lose, misplace, or improperly install during maintenance outages.
• Full Factory Test: Every unit undergoes a 24-hour burn-in with live I/O loopback, precision microvolt source calibration (spanning –5 mV to +70 mV), 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 DS3800HLOC 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 DS3800HLOC 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 makes the HLOC different from the HLOA?
Both boards handle low-level millivolt signals. The key difference is that the HLOC has onboard cold-junction compensation for direct thermocouple measurement, while the HLOA requires external cold-junction reference. The HLOC also has internal IONet termination (C suffix) versus the HLOA’s external termination requirement (A suffix). For direct thermocouple applications at end-of-chain positions, the HLOC is the optimal choice.

What thermocouple types does the HLOC support?
The board supports J, K, and T thermocouple types through firmware linearization tables. Type selection is configured in the Mark VI I/O configuration software (Toolbox or CIMPLICITY)—the board reads raw millivolt values and the controller applies the appropriate linearization. The CJC calibration is stored onboard and provides consistent reference junction temperature measurement regardless of thermocouple type.

Will this board work with RTD sensors or 4-20 mA transmitters?
No—the HLOC is specifically optimized for thermocouple signals in the millivolt range. RTD sensors require excitation current and different signal conditioning; 4-20 mA signals require burden resistors and different input scaling. For those signal types, you should use the appropriate HLIA, HLNA, or dedicated input cards.

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 and CJC calibration constants reside in firmware. A mismatch can cause a +1°C offset at 700°C thermocouple reading. 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 DS3800HLOC 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, the onboard CJC sensor is sensitive to temperature gradients across the board—avoid mounting the board near heat sources or in areas with rapid temperature changes. For thermocouple inputs, use shielded extension wire and ground the shield only at the source end. Never run thermocouple cables in the same conduit as AC power lines.

Is programming or configuration required, or is it plug-and-play?
It’s “plug-and-play” only if your IONet configuration already expects an HLOC at that slot address and your field sensors match the factory configurations. 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.

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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