Description
Technical Parameters
| Parameter | Specification |
|---|---|
| Analog Inputs | 8 differential, thermocouple-dedicated |
| Input Types | TC (J,K,T,E,R,S,B,N) – full ITS-90 |
| Analog Outputs | None (input-only) |
| ADC Resolution | 20-bit sigma-delta (effective: 17.5 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 | ±0.25°C (integrated, four sensors) |
| Isolation | 2000V RMS (field-to-backplane) |
| CMRR | >105 dB at 50/60 Hz |
| Operating Temp | -40°C to +85°C |
| Power Supply | +5V @ 1.2A; +15V @ 0.5A (VME backplane) |
| Power Dissipation | 9.5W max |
| Diagnostics | Open/short detection, out-of-range, rate-of-change, CJC health, internal temp, supply telemetry |
| Form Factor | 6U VME (single-slot) |
| Firmware | Field-upgradeable via JTAG |
| Conformal Coating | Standard |
| MTBF | >280,000 hours |
Advantages and Key Features
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Thermocouple-Dedicated Design – Optimized exclusively for TC signals; no unnecessary circuitry, improving reliability and CJC accuracy.
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20-Bit ADC – Industry-leading resolution for thermocouple measurement.
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Excellent CJC Accuracy – ±0.25°C, significantly better than HMPG series.
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High Isolation – 2000V, matching the best HMPG revisions.
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Fast Sampling – Up to 500 Hz, equal to flagship HMPG.
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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.
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Conformal Coating Standard – Built-in protection for harsh environments.
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Hot-Swap Capable – IEEE 1101.11 compliant.
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Advanced Diagnostics – Comprehensive per-channel health monitoring.
Application Fields
| Industry | Applications |
|---|---|
| Power Generation (Gas Turbines) | GE Frame 6B/7E/7FA/9E – EGT monitoring, combustion temperature mapping |
| Power Generation (Steam Turbines) | GE D-11/D-15 – high-pressure steam temperature, bearing monitoring |
| Combined Cycle | HRSG superheater/reheater outlet temperature |
| Oil & Gas | LM2500/LM6000 – turbine exhaust temperature, compressor discharge |
| Marine | Naval gas turbines – propulsion exhaust temperature monitoring |
Comparison with Other GE Revisions
| Feature | DS3800HMPJ1A1A | DS3800HMPJ | DS3800HMPG1G1D | DS3800HMAC1H1F |
|---|---|---|---|---|
| ADC Resolution | 20-bit (17.5 eff.) | 20-bit (18 eff.) | 18-bit (16.5 eff.) | 18-bit (16.8 eff.) |
| Accuracy | ±0.05% | ±0.03% | ±0.05% | ±0.04% |
| CJC Accuracy | ±0.25°C | ±0.2°C | ±0.3°C | ±0.4°C |
| Max Sampling | 500 Hz | 1000 Hz | 500 Hz | 1000 Hz |
| Isolation | 2000V | 2500V | 2000V | 2500V |
| Firmware Upgrade | Yes (JTAG) | Yes (JTAG+USB) | Yes (JTAG) | Yes |
| Conformal Coating | Standard | Standard | Optional | Standard |
| Diagnostics | Advanced | Predictive health | Advanced | Advanced+ |
| MTBF | 280k hrs | 300k hrs | 245k hrs | 280k hrs |
Competitor Comparison:
| Feature | DS3800HMPJ1A1A | Siemens 6ES7531-7KF00 | ABB AI810 |
|---|---|---|---|
| Platform | GE VME Speedtronic | S7-1500 (Profinet) | ABB 800xA |
| VME Native | Yes | No | No |
| CJC Accuracy | ±0.25°C | ±0.5°C (external) | ±1.0°C |
| Isolation | 2000V | 500V (group) | 2500V |
| Hot-Swap | Yes | No | Yes |
Selection Recommendations
| Scenario | Recommendation |
|---|---|
| Existing installation with 1A1A | Continue use if acceptable; spares may be limited. |
| Need improved accuracy/speed/isolation | Upgrade to full DS3800HMPJ (±0.03%, 1000Hz, 2500V, USB firmware). |
| Need outputs | Use DS3800HMAC1G1E or DS3800HMAC1H1F. |
| Need highest accuracy/speed | Upgrade to full DS3800HMPJ (20-bit, 1000Hz, 2500V). |
| Need N-type support | 1A1A supports N-type – acceptable. |
| Triple-redundant | Use three identical 1A1A modules. Do not mix with other revisions. |
| Non-GE retrofit | Do not use – strictly for VME Speedtronic. |
| Spare stock | Limited – source refurbished units from certified centers. |
Critical Precautions
Pre-Installation
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Authenticate module – Check GE hologram labels; verify serial number traceability.
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Inspect connectors – Check P1/P2 for bent pins or corrosion.
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Verify firmware – Read via JTAG; confirm Mark V compatibility (V5.05+ recommended).
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Verify conformal coating – Standard on HMPJ; check for uniform coverage.
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%).
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Insertion – Align guides; apply even pressure; tighten screws to 0.4-0.6 Nm. Never force.
Field Wiring (Critical for TC)
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Cable – Must use thermocouple-grade extension wire matching TC type. Copper wire introduces errors.
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Shielding – Belden 8760 or equivalent; ground shield only at module end.
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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.
Environmental
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CJC stability – Avoid heat sources or air vents near terminal block.
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Operating temp – -40°C to +85°C; keep rack <70°C.
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Warm-up – Allow 30 minutes for CJC stabilization.
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Humidity – 5-95% RH non-condensing.
Procurement
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Authentic sourcing – Buy from GE-authorized distributors or certified repair centers.
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Refurbished units – Request CJC calibration certificate and 1-year warranty.
Siemens 6ES5376-1AA21
NI PCI-6503
SIEMENS 6FC5247-0AA11-0AA1
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