Description
4-channel thermocouple module
Model and Article Information
- Model Number: EM AT04
- Article Number: E 288-3AT04-0AA1
- Description: 4-channel thermocouple module designed for precise temperature measurements using thermocouples.
Physical and Power Specifications
- Dimensions (WxHxD): 47 mm × 100 mm × 81 mm
- Power Consumption: 1.5 W
- Current Consumption:
- SM bus: 120 mA
- 24V DC: 40 mA
Analog Input Specifications
- Number of Inputs: 4 channels for thermocouple connections
- Measuring Principle: Sigma-Delta (provides high-precision conversion from analog to digital)
- Resolution:
- Temperature: 0.1°C / 0.1°F
- Voltage: 15 bits + symbol bits (for voltage measurement, providing high resolution)
- Max. Voltage Resistance: ±35V (protects against high-voltage spikes)
- Cold End Temperature Error: ±1.5°C (temperature compensation for the cold junction, typical in thermocouple measurements)
Isolation and Protection
- Isolation:
- Field side and logic side: 500V AC
- Field side and 24V DC side: 500V AC
- 24V DC side and logic side: 500V AC
- Channel-to-Channel Isolation: Supported (each channel is electrically isolated for improved noise immunity and reduced cross-talk)
- Common Mode Rejection: >120 dB at 120V AC (provides excellent noise rejection, especially in industrial environments with electrical noise)
- Repeatability: ±0.05% FS (Full Scale) for consistent and stable readings
Cable and Sensor Specifications
- Cable Loop Resistance (Max): 100Ω (important for ensuring signal integrity in the sensor wiring)
- Cable Length: Up to 100 meters with shielded twisted pair cable (providing long-distance measurement capabilities while minimizing interference)
Diagnostic Features
- Diagnosis Capabilities:
- Overflow/underflow detection
- Circuit break detection
- 24V DC low voltage detection
Frequency Rejection and Filter Settings
- Rejection Frequency Selection: The module supports different frequency rejection settings to filter out electrical noise:
- 400 Hz (2.5 ms integration time)
- 60 Hz (16.6 ms integration time)
- 50 Hz (20 ms integration time)
- 10 Hz (100 ms integration time)
- Note:
- When 400 Hz inhibition is selected, the integration time is reduced to 10 ms, maintaining the module’s resolution and accuracy, while suppressing noise at 100 Hz and 200 Hz frequencies.
