Product Short Description
Product Overview
Specialized temperature signal conditioning module for GE Mark VI gas/steam turbine safety control systems, converting thermocouple and RTD resistance temperature detector weak analog signals into standard 4–20 mA isolated signals for turbine cabinet PLC collection. It supports multi-type temperature sensor signal input with built-in cold junction compensation and over-temperature fault alarm functions.
Description
Technical Specifications
- Supported Input Sensors: K/E/J/T type thermocouples, Pt100 platinum resistance temperature detectors
- Signal Output Standard: Isolated 4–20 mA DC analog signal proportional to temperature value
- Temperature Measurement Precision: ±0.05% full scale
- Galvanic Isolation Voltage: 3000 V AC between sensor input and system output circuit
- Power Supply: 24 V DC turbine control cabinet power supply
- Dimension: 132 mm × 85 mm × 30 mm, weight 0.45 kg
- Operating Temperature: -20 ℃ ~ +70 ℃, suitable for turbine side heat environment
- Diagnosis Functions: Sensor open circuit, short circuit, over-range temperature alarm output
Core Functional Features
- Automatic cold junction compensation for thermocouple signals to eliminate ambient temperature measurement error
- High-precision signal amplification circuit for weak millivolt thermocouple voltage signals
- Full isolation design to resist electromagnetic interference from turbine high-power generator equipment
- Configurable temperature range via GE Toolbox engineering software for different sensor types
- Independent fault relay output for over-temperature safety interlock trigger
Working Principle
Weak millivolt voltage signals from thermocouples or resistance change signals from Pt100 RTD sensors enter the front-end signal amplification circuit of XMTC-62-21. The internal cold junction compensation chip corrects temperature deviation caused by terminal ambient temperature fluctuation, then the DAC circuit converts calibrated temperature values into standard 4–20 mA isolated analog output signals transmitted to Mark VI main controller. Real-time impedance detection of sensor wiring; abnormal impedance triggers fault relay action to send over-temperature or broken wire alarm signal to turbine safety interlock logic.
Structural & Material Characteristics
- Housing: Aluminum alloy heat dissipation shell to adapt high-temperature turbine cabinet environment
- Signal circuit: Multi-layer isolated PCB with independent temperature compensation chip
- Wiring terminals: High-temperature resistant screw terminals suitable for turbine workshop ambient
Installation Requirements
- Installed on dedicated DIN rail inside GE Mark VI turbine control cabinet
- Temperature sensor signal cables use shielded compensation wire dedicated to thermocouple/RTD
- Separate sensor wiring from turbine excitation high-current power cables
Application Scenarios
Gas turbine bearing temperature monitoring, steam turbine cylinder wall temperature measurement, generator winding over-temperature detection, combustion chamber thermocouple signal conditioning, turbine lubricating oil temperature safety monitoring.
Operation & Maintenance Precautions
- Thermocouple compensation wires must use matched model; mixed wire types cause severe measurement deviation
- Calibrate temperature measurement range every 12 months according to turbine maintenance cycle
- Regularly check terminal heat generation; loose screws lead to temperature signal drift
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