GE DS200TCQAG1A

Technical Parameters

Manufacturer: GE
Series: Mark V / Mark VIe
Channels: 16 differential
Input Range: -10 mV to +100 mV (Type J/K/T/E)
Cold Junction: Single onboard sensor with enhanced linearization and improved thermal isolation (better than standard G1)
Isolation: 1500V AC
Accuracy: ±0.08% at 25°C, ±0.15% across full temperature range
Sampling: 10 Hz sequential
Operating Temp: -30°C to +65°C
Storage Temp: -40°C to +85°C
Mounting: VME rack
Suffix “G1A”: High accuracy + advanced diagnostics (drift, degradation, sense-lead integrity) + G1 wiring + improved cold-junction compensation + basic temperature range + standard conformal coating

Key Features

High accuracy – ±0.08% for critical temperature monitoring
Advanced diagnostics – drift monitoring, degradation prediction, sense-lead integrity, and open/short detection
Improved cold-junction compensation – better linearization across ambient variations than standard G1
Faster sampling – 10 Hz for responsive monitoring
G1 wiring configuration – standard channel-to-terminal mapping matching most GE cabinets
Simple swap – no firmware changes required in most Mark V systems
LED status per channel + board health with diagnostic indicators
Standard conformal coating for moisture/dust resistance
Backward compatible with Mark V and Mark VIe (hot-swap only on VIe Rev D+)

Applications

Gas turbine EGT monitoring – high accuracy with predictive diagnostics and improved cold-junction stability
Steam turbine bearing and casing temperatures – critical protection with drift anticipation
Generator stator cooling monitoring – precise measurements with diagnostic assurance
HRSG temperature measurements – enhanced reliability for efficiency-critical points
Compressor performance monitoring – where sensor degradation cannot be tolerated and ambient temperature variations are significant

Comparison with Competitors

Selection Tips

Choose the DS200TCQAG1A if you need high accuracy (±0.08%), advanced diagnostics, and improved cold-junction compensation with G1 wiring in a standard temperature environment
For extended temperature range (70°C) with similar features, consider DS200TCQAG1B (if available)
For enhanced coating protection with similar specs, consider DS200TCQAG1A with specialized coating suffix (e.g., DS200TCQAG1ABC or similar)
For basic accuracy without diagnostics, the DS200TCEBG1A is more economical
For 4-wire long-distance needs with diagnostics, consider DS200TCDAH1BGD (lower accuracy at ±0.10%)
Verify existing wiring is 2-wire standard – G1-series terminal mapping applies
Source refurbished units with cold-junction compensation verification and diagnostic test validation

Precautions

ESD sensitive – use wrist strap
Power down for Mark V removal (no hot-swap)
Torque terminals to 0.5 N·m max
Do not exceed -30°C to +65°C operating range
Calibrate every 24 months – diagnostics and enhanced accuracy depend on a valid baseline calibration
Ground shields only at the board end
Verify thermocouple type – optimized for J/K (T/E reduces accuracy to ±0.15%)
Monitor diagnostic logs – drift warnings indicate sensor aging; plan proactive replacement
Label clearly – mark as “TCQAG1A – DIAG/ENH CJC” to ensure proper handling and maintenance tracking