Cold Junction Compensation

• Cold junction compensation is performed at the thermocouple connector.The thermocouple must be connected using K Type Thermocouple wire or K Type compensating wire all the way to the amplifiers connector (there must be no copper wire in-between).

Input characteristics

• Common mode voltage range: - 5V to + 2.5V
• Input impedance: Negative input 100 kΩ to 0V
• Input impedance: Positive input > 1 MΩ to 0V

Output characteristics

• Normal operation:
  • Maximum sink current: 5mA (0 to 5V output)
  • Maximum source current: 5mA (0 to 4.2V output), 2mA (4.2 to 5V output)
• Absolute Maximum:
  • Output sink current: 5mA max
  • Output source current: current limited, protected against continuous short to 0V
  • Applied output voltage: 0V, 5.0Vmax. voltages outside these limits may cause damage
  • Driven output voltage: - 0.3Vmin, 5.3Vmax. (no load)

Power Supply

• Supply current: 1mA typical (plus output drive current)
• Supply voltage:
  • Recommended voltage: 8V regulated
  • Operational voltage range: 7.5VDC min, 22VDC max
  • If connected to a 12V vehicle battery then the connection should be made near a device that includes transient voltage clamping of 60V or less
  • Maximum reverse voltage: - 20V
  • Max transient supply voltage: 60V for < 100ms at < 1% duty

Accuracy

• Conditions: 25°C ambient and 25°C measured
• Calibration error: ± 3°C
• Gain error: ± 0.5% max
• Temp drift: ± 0.05 °C / °C max (over 0 to 50°C ambient)
• Total errors:
  • (Calibration + Gain + Temp drift) for 0°C to 50°C ambient
  • At measured temp of 25°C, Total error ± 4.25°C
  • At measured temp of 1000°C, Total error ± 9.25°C

Operating temperature

• Operating Temp Range: – 10°C to 80°C ambient

Ingress Protection (IP) Rating

• Environmental protection: IP53 (with connector facing down)