Description
Technical Parameters
| Parameter | Specification |
|---|---|
| Analog Inputs | 8 differential, thermocouple-dedicated |
| Input Types | TC (J,K,T,E,R,S,B,N) – N-type supported |
| Analog Outputs | None (input-only) |
| ADC Resolution | 18-bit sigma-delta (effective: 16.5 bits) |
| Sampling Rate | 10-500 Hz per channel (user-selectable) |
| Accuracy | ±0.05% FS (25°C); ±0.12% (-40°C to +85°C) |
| CJC Accuracy | ±0.3°C (integrated, three sensors) |
| Isolation | 2000V RMS (field-to-backplane) |
| CMRR | >100 dB at 50/60 Hz |
| Operating Temp | -40°C to +85°C |
| Power Supply | +5V @ 1.2A; +15V @ 0.5A (VME backplane) |
| Power Dissipation | 9W max |
| Diagnostics | Open/short detection, out-of-range, rate-of-change, CJC health, internal temp, supply telemetry, watchdog |
| Form Factor | 6U VME (single-slot) |
| Firmware | Field-upgradeable via JTAG |
| Conformal Coating | Optional |
| MTBF | >245,000 hours |
Advantages and Key Features
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Thermocouple-Dedicated Design – Optimized exclusively for TC signals; no unnecessary circuitry for RTD/mA/V, improving reliability and CJC accuracy.
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Flagship Performance – Matches the full DS3800HMPG specification: 18-bit ADC, 500 Hz sampling, 2000V isolation, and ±0.3°C CJC accuracy.
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N-Type Support – Full ITS-90 linearization including N-type thermocouples.
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Field-Upgradeable Firmware – JTAG port for updates (rare in suffix variants).
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Comprehensive Diagnostics – Per-channel health monitoring, rate-of-change detection, internal temperature and supply voltage telemetry.
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Hot-Swap Capable – IEEE 1101.11 compliant.
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High MTBF – >245,000 hours.
Application Fields
| Industry | Applications |
|---|---|
| Power Generation (Gas Turbines) | GE Frame 6B/7E/7FA/9E/9FA/7HA – EGT monitoring, combustion temperature mapping, TIT control |
| Power Generation (Steam Turbines) | GE D-11/D-15 – high-pressure steam temperature, bearing monitoring |
| Combined Cycle | HRSG superheater/reheater outlet temperature, gas turbine inlet temperature |
| Oil & Gas | LM2500/LM6000/LMS100 – turbine exhaust temperature, compressor discharge temperature |
| Marine | Naval gas turbines – propulsion exhaust temperature monitoring |
Comparison with Other GE Revisions
| Feature | DS3800HMPG1G1D | DS3800HMPG1D1D | DS3800HMPG | DS3800HMAC1H1F |
|---|---|---|---|---|
| ADC Resolution | 18-bit (16.5 eff.) | 18-bit (16.2 eff.) | 18-bit (16.5 eff.) | 18-bit (16.8 eff.) |
| Accuracy | ±0.05% | ±0.06% | ±0.05% | ±0.04% |
| CJC Accuracy | ±0.3°C | ±0.35°C | ±0.3°C | ±0.4°C |
| Max Sampling | 500 Hz | 300 Hz | 500 Hz | 1000 Hz |
| Isolation | 2000V | 1500V | 2000V | 2500V |
| Firmware Upgrade | Yes (JTAG) | No | Yes (JTAG) | Yes |
| Conformal Coating | Optional | No | Optional | Standard |
| Diagnostics | Advanced | Enhanced | Advanced | Advanced+ |
| MTBF | 245k hrs | 230k hrs | 240k hrs | 280k hrs |
Note: The DS3800HMPG1G1D is functionally equivalent to the base DS3800HMPG in most respects. The suffix difference typically indicates a specific factory calibration profile or minor firmware variation for a particular customer or application. Verify compatibility with your Mark V system before use.
Competitor Comparison:
| Feature | DS3800HMPG1G1D | Siemens 6ES7531-7KF00 | ABB AI810 | Rockwell 1756-IF8I |
|---|---|---|---|---|
| Platform | GE VME Speedtronic | S7-1500 | ABB 800xA | ControlLogix |
| Inputs | 8 TC-only | 8 universal | 8 universal | 8 isolated |
| CJC Accuracy | ±0.3°C | ±0.5°C (external) | ±1.0°C | N/A |
| Isolation | 2000V | 500V (group) | 2500V | 2500V |
| Sampling | 500 Hz | 100 Hz | 100 Hz | 100 Hz |
| VME Native | Yes | No | No | No |
| Hot-Swap | Yes | No | Yes | Yes |
| TC Linearization | ITS-90 (including N) | ITS-90 | ITS-90 | N/A |
Key Differentiator: The General Electric DS3800HMPG1G1D delivers flagship TC-dedicated performance with 18-bit resolution, 500 Hz sampling, and 2000V isolation—all while maintaining native VME compatibility that competitors cannot match. It is functionally equivalent to the base HMPG and outperforms all earlier HMPF and HMPG suffix variants.
Selection Recommendations
| Scenario | Recommendation |
|---|---|
| New Mark V system with EGT monitoring | DS3800HMPG1G1D is an excellent choice—flagship TC-dedicated performance. |
| Upgrading from HMPF or earlier HMPG | Significant upgrade: 18-bit ADC, 500Hz, 2000V isolation, field-upgradeable firmware. Pin-compatible; verify Mark V firmware V5.03+. |
| Need outputs as well | Use DS3800HMAC1G1E or DS3800HMAC1H1F (universal with outputs). |
| Need highest accuracy overall | DS3800HMAC1H1F offers ±0.04% accuracy and 1000Hz but is universal (not TC-dedicated). |
| Need N-type thermocouple support | DS3800HMPG1G1D fully supports N-type. |
| Triple-redundant | Use three identical 1G1D modules. Do not mix with other revisions. |
| Non-GE retrofit | Do not use – strictly for VME Speedtronic. |
| Spare stock | Stock one spare per three active units. Lead times: 8-12 weeks. |
| Harsh environment | Specify conformal coating option when ordering. |
Critical Precautions
Pre-Installation
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Authenticate module – Check GE hologram, serial number traceability, NIST calibration certificate.
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Verify firmware – Read via JTAG; confirm Mark V compatibility (V5.03+ recommended).
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Inspect connectors – Check P1/P2 for bent pins or corrosion.
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Check conformal coating – If specified, verify uniform coating.
Installation
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ESD protection – Wear grounded wrist strap; handle by edges only.
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Backplane voltage – Verify +5V (±2%), +15V (±1.5%), -15V (±1.5%) before insertion.
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Insertion – Align guides, apply even pressure, tighten retaining screws to 0.4-0.6 Nm. Never force.
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Power-on – Insert before applying backplane power.
Field Wiring (Critical for TC Accuracy)
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Cable – Must use thermocouple-grade extension wire matching TC type (e.g., Type K extension for Type K). Copper wire introduces significant measurement errors.
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Shielding – Belden 8760 or equivalent shielded twisted-pair. Connect shield to module shield terminal; ground only at module end (not both ends).
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Separation – 30cm from AC power; 60cm from VFD cables; cross at 90° if unavoidable.
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Torque – 0.5-0.6 Nm (4.4-5.3 lb-in); strip length 7-8mm.
Firmware & Configuration
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Field-upgradeable – Use JTAG programmer; follow GE procedure carefully.
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Channel config – Use Mark V Toolbox to select TC type for each channel.
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Open-circuit config – Select upscale or downscale drive for burnout detection (typically upscale for EGT).
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Rate-of-change – Configure thresholds for predictive maintenance alerts.
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Calibration – Factory valid for 5 years; use precision calibrator (e.g., Fluke 754) for field verification after extreme thermal events.
Environmental
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CJC stability – Avoid mounting near heat sources, air vents, or fans that create temperature gradients across the terminal block. This directly affects CJC accuracy.
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Operating temp – -40°C to +85°C; maintain rack temperature <70°C for long-term reliability.
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Warm-up – Allow 30 minutes for CJC thermal stabilization after power-up before relying on critical measurements.
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Humidity – 5-95% RH non-condensing.
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Vibration – 5g (10-500Hz) per IEC 60068-2-6.
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Clearance – Maintain 10mm airflow clearance.
Procurement
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Authentic sourcing – Buy from GE-authorized distributors or certified repair centers.
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Refurbished units – Request NIST-traceable CJC calibration certificate and minimum 1-year warranty.
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Storage – ESD-safe packaging with desiccant; shelf life 10 years at 25°C ±10°C, <60% RH.
Safety & Compliance
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Not SIL-rated – Trip logic implemented at Mark V CPU via 2-out-of-3 voting.
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CE/FCC – Complies with EN 61326-1 (industrial immunity) and FCC Part 15 Class A.
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ATEX – Not certified for hazardous areas; mount in purge-pressurized enclosure if required.
Ӣ PMU-D21
Siemens 6ES5376-1AA21
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