Description
Technical Parameters
| Parameter | Specification |
|---|---|
| Analog Inputs | 8 differential, thermocouple-dedicated |
| Input Types | TC (J,K,T,E,R,S,B) only |
| Analog Outputs | None (input-only) |
| ADC Resolution | 14-bit (effective: 13 bits) |
| Sampling Rate | 10-25 Hz per channel (fixed) |
| Accuracy | ±0.22% FS (25°C); ±0.45% (-40°C to +85°C) |
| CJC Accuracy | ±0.7°C (integrated) |
| Isolation | 1000V RMS (field-to-backplane) |
| CMRR | >72 dB at 50/60 Hz |
| Operating Temp | -40°C to +85°C |
| Power Supply | +5V @ 0.8A; +15V @ 0.3A (VME backplane) |
| Power Dissipation | 7W max |
| Diagnostics | Basic open-circuit detection, out-of-range alarms |
| Form Factor | 6U VME (single-slot) |
| Firmware | Factory-programmed (not field-upgradeable) |
| MTBF | >175,000 hours |
Advantages and Key Features
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Thermocouple-Dedicated – Optimized for TC signals only.
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Integrated CJC – Onboard cold-junction compensation.
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Open-Circuit Detection – Basic burnout detection.
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Hot-Swap Capable – IEEE 1101.11 compliant.
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Simple Design – Reliable low-component-count architecture.
Application Fields
| Industry | Applications |
|---|---|
| Power Generation | GE Frame 5/6B gas turbines – EGT monitoring |
| Steam Turbines | Small steam turbines – temperature monitoring |
| Industrial | Cogeneration – exhaust temperature |
Comparison with Newer GE Revisions
| Feature | DS3800HMPF1B1B | DS3800HMPF | DS3800HMAC1H1F |
|---|---|---|---|
| Input Channels | 8 | 8 | 8 |
| ADC Resolution | 14-bit (13 eff.) | 16-bit (15 eff.) | 18-bit (16.8 eff.) |
| Accuracy | ±0.22% | ±0.08% | ±0.04% |
| CJC Accuracy | ±0.7°C | ±0.3°C | ±0.4°C |
| Max Sampling | 25 Hz | 100 Hz | 1000 Hz |
| Isolation | 1000V | 1500V | 2500V |
| Firmware Upgrade | No | No | Yes |
| Conformal Coating | No | Optional | Standard |
| MTBF | 175k hrs | 210k hrs | 280k hrs |
Competitor Comparison:
| Feature | DS3800HMPF1B1B | Siemens 6ES7531-7KF00 | ABB AI810 |
|---|---|---|---|
| Platform | GE VME Speedtronic | S7-1500 | ABB 800xA |
| VME Native | Yes | No | No |
| CJC Accuracy | ±0.7°C | ±0.5°C (external) | ±1.0°C |
Selection Recommendations
| Scenario | Recommendation |
|---|---|
| Existing installation with 1B1B | Continue use if acceptable; spares limited. |
| Need improved accuracy | Upgrade to later DS3800HMPF (±0.08%, ±0.3°C CJC). |
| Need outputs | Use DS3800HMAC1G1E or DS3800HMAC1H1F. |
| Triple-redundant | Use three identical 1B1B modules. Do not mix revisions. |
| Non-GE retrofit | Do not use – strictly for VME Speedtronic. |
| Spare stock | Extremely limited – source refurbished units only. |
Critical Precautions
Pre-Installation
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Authenticate module – Check GE labels; verify serial number.
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Inspect connectors – Check for bent pins or corrosion.
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Firmware note – Factory-programmed; cannot be updated.
Installation
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ESD protection – Wear grounded wrist strap.
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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; 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.
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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 after power-up.
Procurement
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Authentic sourcing – Obsolete; source from certified GE repair centers only.
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Refurbished units – Request CJC calibration certificate and 1-year warranty.
Final Summary
The General Electric DS3800HMPF1B1B is an early, obsolete thermocouple input module for GE Speedtronic systems. Its 14-bit ADC, ±0.22% accuracy, ±0.7°C CJC, and 1000V isolation are significantly outdated. Only consider this module for maintaining existing installations with identical spares. For upgrades, choose the later DS3800HMPF (better TC accuracy) or DS3800HMAC1H1F (universal with outputs). Source refurbished units exclusively from certified GE repair centers.
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