Model 137 Aircraft Hygrometer

• Description: Dew Point Hygrometer
• Manufacturer: EdgeTech
• Model: 137 -A3
• Serial Number: 36278

The temperature range configuration was changed from -60 C - 40 C, to -70 C to -30 C. The serial output frequency was changed from 5 seconds to 1 second.

• Dew/Frost Point Range
  • −50 to +90 °C

• Dew/Frost Point Accuracy
  • ±0.20 °C nominal

• Depression
  • 65°C,nominal

• Slew Rate
  • 1.5°C/second max, above 0°C

• Repeatability
  • ± 0.05°C

• Precision
  • 0.1 °C

• Sample Flow Rate
  • 0.25 - 2.5 liters/minute

• Operating Temperature
  • Control Unit: 0 to + 50°C
  • Sensor: 50 to +100°C

• Power Requirements
  • 90 to 240 VAC, 50 - 60Hz
  • 75 watts Maximum

Picture of Control Unit Side

Control Unit Back

Control Unit Face

Sensor Head

Data Cable

Sensor Element