Description
GE HE693THM166
Technical Specifications:
- Channels: 16 thermocouple inputs
- Thermocouple Types: J, K, T, E, N, R, S, B
- Cold Junction Compensation: Built-in, accuracy ±0.5°C
- Resolution: 0.1°C
- Accuracy: ±1.5°C or ±0.25% of reading (whichever is greater)
- Update Rate: 4 Hz per channel
- Isolation: 1500 VDC
- Power: ~3 W
Functional Features:
- Per-channel thermocouple type selection via software
- Open-thermocouple detection with alarm
- Grounding fault detection
- LED indicators per 4-channel group
Application Scenarios:
- Gas turbine inlet temperature (TIT) monitoring
- Exhaust gas temperature measurement
- Bearing and winding temperature monitoring
- Boiler and furnace temperature profiling
Material Composition:
- PCB: 4-layer with thermocouple-grade low-thermal-EMF connectors
- Connectors: Gold-plated thermocouple terminal blocks
- Housing: Aluminum with EMI shield
Working Principle: Each thermocouple input is connected to a precision amplifier that measures the microvolt-level signal. The cold junction temperature is measured by an on-board sensor and used to compensate the reading. The compensated temperature is digitized by a 16-bit A/D and sent to the CPU via backplane. Installation Requirements:
- Use thermocouple extension wire of the same type as the sensor
- Maintain proper polarity at all connections
- Keep thermocouple wires away from power cables (minimum 150 mm separation)
Usage Precautions:
- Never mix thermocouple types on the same module without reconfiguration
- Verify cold junction sensor is not exposed to heat sources
- Calibrate against a reference thermometer annually
