Description
Technical Parameters
| Parameter | Specification |
|---|---|
| Inputs | 8 differential, universal |
| Input Types | ±10V, ±5V, 0-10V, 4-20mA, RTD (Pt100) |
| ADC | 16-bit SAR (effective: 15 bits) |
| Accuracy | ±0.10% FS (25°C); ±0.25% (-40°C to +85°C) |
| Sampling | Up to 5000 Hz per channel |
| Isolation | 1000V RMS |
| Power | +5V @ 0.8A; +15V @ 0.3A |
| Diagnostics | Out-of-range, rate-of-change, watchdog |
| Firmware | Factory-programmed (not field-upgradeable) |
| Conformal Coating | No |
| MTBF | >180,000 hours |
Advantages
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High Speed – 5000 Hz sampling, significantly faster than HMP/HMAC series.
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Universal Inputs – Accepts voltage, current, and RTD signals.
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Dynamic Response – Optimized for vibration, speed, and pressure transient monitoring.
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Hot-Swap Capable – IEEE 1101.11 compliant.
Applications
| Industry | Use |
|---|---|
| Gas Turbines | Bearing vibration, shaft speed, dynamic pressure |
| Steam Turbines | Overspeed detection, valve position feedback |
| Compressors | Surge detection, high-speed pressure transients |
| Pumps | Motor current monitoring, speed feedback |
Comparison
| Feature | DS3800HNMA | DS3800HMPK (TC-dedicated) | DS3800HMAC1H1F (Universal) |
|---|---|---|---|
| Inputs | 8 universal | 8 TC-only | 8 universal + 4 outputs |
| ADC | 16-bit SAR | 24-bit sigma-delta | 18-bit sigma-delta |
| Sampling | 5000 Hz | 2000 Hz | 1000 Hz |
| Accuracy | ±0.10% | ±0.02% | ±0.04% |
| Isolation | 1000V | 2500V | 2500V |
| Best For | Dynamic signals | Temperature | General-purpose I/O |
Selection
| Scenario | Choice |
|---|---|
| Vibration/speed monitoring | DS3800HNMA – high-speed dynamic response. |
| Temperature monitoring (EGT) | Use DS3800HMPK series (TC-dedicated). |
| General-purpose I/O with outputs | Use DS3800HMAC1H1F. |
| TMR | Three identical HNMA modules. |
| Non-GE | Do not use – VME only. |
Critical Precautions
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Authenticate – Check GE hologram, serial number.
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ESD – Wear grounded wrist strap.
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Backplane – Verify +5V, +15V, -15V before insertion.
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Wiring – Use shielded twisted-pair for voltage/current signals. Maintain separation from AC power.
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Torque – 0.5-0.6 Nm.
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Temp – Keep rack <70°C.
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Firmware – Factory-programmed; cannot be field-updated.
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Sourcing – Obsolete; source refurbished from certified GE repair centers.
Final Summary
The General Electric DS3800HNMA is a high-speed universal analog input module designed for dynamic signal monitoring (vibration, speed, pressure transients) in GE Speedtronic systems. It offers 5000 Hz sampling, significantly faster than temperature-dedicated HMPK or general-purpose HMAC modules. However, it has lower accuracy (±0.10%), lower isolation (1000V), and is factory-programmed (no field firmware updates). For temperature-critical applications, choose DS3800HMPK. For general-purpose I/O with outputs, choose DS3800HMAC1H1F. Source from certified repair centers.
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