Chapter 4: Specifications
Page 46 HygroPro User’s Manual
4.4 Moisture Sensor
Sensor Type
• Thin-film aluminum oxide moisture sensor probe
Calibration
• Each sensor is individually computer-calibrated against known
moisture concentrations, traceable to
NIST
Calibration Interval
• Sensor recalibration at GE is recommended every six to twelve
months, depending on the application
Flow Rate
• Gases: Static to 100 m/s linear velocity at a pressure of 1 atm.
• Liquids: Static to 10 cm/s linear velocity at density of 1 g/cc
4.5 Built-In Temperature Sensor
Type
• Nonlinear NTC thermistor (resultant temperature linearized by
microprocessor)
Measurement Range
• –22° to 158°F (–30° to 70°C)
Accuracy
• ±0.9°F (±0.5°C) overall
Response Time (Maximum)
• One second in well stirred oil, or 10 seconds in still air, for a 63%
step change in increasing or decreasing temperature
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