Description
Technical Parameters
| Parameter | Specification |
|---|---|
| Analog Inputs | 16 differential channels, software-configurable |
| Input Types | TC (J,K,T,E,R,S,B,N), RTD (Pt100,Ni100), 4-20mA, 0-10V, ±50mV, ±100mV |
| Analog Outputs | None (input-only module) |
| ADC Resolution | 16-bit sigma-delta (effective: 15 bits) |
| Sampling Rate | 10-100 Hz per channel (user-selectable) |
| Accuracy | ±0.10% FS (25°C); ±0.25% (-40°C to +85°C) |
| Isolation | 1500V RMS (field-to-backplane) |
| CMRR | >85 dB at 50/60 Hz |
| Operating Temp | -40°C to +85°C |
| Power Supply | +5V @ 1.5A; +15V @ 0.5A (VME backplane) |
| Power Dissipation | 11W max |
| Diagnostics | Open/short detection, out-of-range alarms, rate-of-change alarms, watchdog timer |
| Form Factor | 6U VME (single-slot) |
| Firmware | Field-upgradeable via JTAG (later revisions) |
| MTBF | >220,000 hours |
Advantages and Key Features
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16 Input Channels – Double the channel density of HMAC series (8 inputs), reducing module count in large turbine applications.
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Universal Inputs – Each channel software-configurable without hardware jumpers.
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High-Density EGT Monitoring – Optimized for exhaust gas temperature thermocouple arrays in gas turbines.
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Integrated CJC – Multiple onboard cold-junction compensation sensors for thermocouple accuracy.
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Advanced Diagnostics – Per-channel health monitoring, rate-of-change detection.
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Watchdog Timer – Configurable failsafe reporting on communication loss.
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Hot-Swap Capable – IEEE 1101.11 compliant for live replacement.
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Field-Upgradeable Firmware – JTAG port for updates (late revisions).
Application Fields
| Industry | Applications |
|---|---|
| Power Generation (Gas Turbines) | GE Frame 6B/7E/7FA/9E/9FA – EGT monitoring (16 thermocouples per module), combustion dynamics, TIT control |
| Power Generation (Steam Turbines) | GE D-11/D-15 – bearing metal RTDs, casing expansion, steam temperature monitoring |
| Combined Cycle | HRSG temperature monitoring – superheater/reheater outlet, economizer inlet |
| Oil & Gas | LM2500/LM6000 – compressor inlet temperature, turbine exhaust temperature |
| Marine | Naval propulsion – multi-point bearing temperature monitoring |
Comparison with HMAC Series (GE Internal)
| Feature | DS3800HMHA | DS3800HMAC1G1E | DS3800HMAC1H1F |
|---|---|---|---|
| Input Channels | 16 (double density) | 8 | 8 |
| Output Channels | None | 4 | 4 |
| ADC Resolution | 16-bit (15 eff.) | 18-bit (16.5 eff.) | 18-bit (16.8 eff.) |
| Accuracy | ±0.10% | ±0.05% | ±0.04% |
| Max Sampling | 100 Hz | 500 Hz | 1000 Hz |
| Isolation | 1500V | 2000V | 2500V |
| Field Firmware | Yes (late rev) | Yes | Yes |
| Form Factor | 6U VME | 6U VME | 6U VME |
Competitor Comparison:
| Feature | DS3800HMHA | Siemens 6ES7531-7KF00 (16-ch) | ABB AI830 (16-ch) |
|---|---|---|---|
| Platform | GE VME Speedtronic | S7-1500 (Profinet) | ABB 800xA |
| Inputs | 16 universal | 16 (grouped config) | 16 (TC/RTD/mA) |
| Isolation | 1500V | 500V (group) | 2500V (channel) |
| Accuracy | ±0.10% | ±0.1% | ±0.08% |
| CJC | Integrated | External | Integrated |
| Hot-Swap | Yes | No | Yes |
| VME Native | Yes | No | No |
| MTBF | 220k hrs | ~150k hrs | ~200k hrs |
Key Differentiator: The General Electric DS3800HMHA offers double the input density of HMAC modules while maintaining VME compatibility, making it the preferred choice for EGT monitoring where 8-input modules would require two slots per 16 thermocouples.
Selection Recommendations
| Scenario | Recommendation |
|---|---|
| EGT monitoring (gas turbines) | DS3800HMHA is the ideal choice – 16 channels match typical EGT thermocouple arrays. |
| Need both inputs and outputs | Use HMAC series ( DS3800HMAC1G1E or DS3800HMAC1H1F ) instead. |
| Need higher accuracy/faster sampling | Consider HMAC G/H series (18-bit, ±0.04%, 1000Hz) if channel count permits. |
| New Mark V system | Select DS3800HMHA for high-density input applications. |
| Triple-redundant (TMR) | Use three identical HMHA modules. Do not mix HMHA with HMAC in TMR sets. |
| Non-GE retrofit | Do not use – strictly for VME Speedtronic. |
| Spare stock | Stock one spare per three active units. Lead times: 8-12 weeks. |
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 (V5.02+ recommended).
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Inspect connectors – Check P1/P2 for bent pins or corrosion.
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
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Cable – Belden 8760 for TC/RTD; Belden 8424 for 4-20mA. Use thermocouple-grade extension wire.
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Shielding – Connect shield to module shield terminal; ground only one 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 (4.4-5.3 lb-in); strip length 7-8mm.
Environmental
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Operating temp – -40°C to +85°C; keep rack <70°C for long-term reliability.
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Humidity – 5-95% RH non-condensing; allow 4-hour warm-up if stored <0°C.
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Vibration – 5g (10-500Hz) per IEC 60068-2-6.
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Clearance – Maintain 10mm airflow clearance; obstruction reduces MTBF.
Firmware & Configuration
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Firmware version – Late revisions support field upgrade; early models are factory-programmed.
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Channel config – Use Mark V Toolbox; no auto-detection. Incorrect config causes erroneous readings.
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Calibration – Factory valid for 5 years; after extreme thermal shock, perform 2-point field check.
Procurement
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Authentic sourcing – Buy only from GE-authorized distributors or certified repair centers.
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Refurbished units – Request NIST calibration certificate and 1-year minimum 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 and FCC Part 15 Class A.
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ATEX – Not certified; mount in purge-pressurized enclosure for hazardous areas.
Final Summary
The General Electric DS3800HMHA is the high-density analog input solution for GE Speedtronic systems, offering 16 universal input channels in a single VME slot. It is the preferred module for EGT monitoring in gas turbines where 16 thermocouple arrays are standard. While its 16-bit ADC and ±0.10% accuracy are sufficient for most temperature monitoring applications, the HMAC G/H series offers superior accuracy, faster sampling, and higher isolation when channel count is less critical. The General Electric DS3800HMHA cannot replace HMAC modules that require analog outputs, nor can HMAC modules match the 16-channel density of HMHA. For new EGT-intensive builds or upgrades, the General Electric DS3800HMHA remains the most space-efficient choice. Ensure Mark V firmware compatibility, source from authorized channels, and follow strict ESD and wiring practices.
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