The Met One Relative Humidity probe represents sensitivity, accuracy, linearity and stability not encountered with conventional relative humidity sensors. It is extremely well suited for meteorological, industrial, laboratory and other demanding applications.

The sensor can also be supplied with a temperature sensor mounted in it and used with various radiation shields for reliable, accurate measurements.

The Relative Humidity Probe is based upon the capacitance change of a polymer thin film capacitor. A one-micron thick dielectric polymer layer absorbs water molecules through a thin metal electrode and causes capacitance change proportional to relative humidity. The thin polymer layer reacts very fast, and therefore, the response time is very short; less than five seconds to 90% of the final value of relative humidity.

General Specifications:

• Input Power: 10 to 18 VDC @ < 5 mA
• Dimensions: Length: 8.5 in (21.59 cm) x Diameter: 0.75 in (1.91 cm)
• Weight: 2.5 oz (70.9 g)

Relative Humidity Specifications:

• Range: 0 - 100% Relative Humidity
• Accuracy: ± 2.0% from 0 - 100% Relative Humidity
• Resolution: 0.1 m/sec
• Output: 0 to 1 VDC Standard (0 to 5.0 VDC Optional)
• Temperature range: -50 °C to +50 °C (-58 °F to 122 °F)
• RH Sensing Element: Thin film polymer capacitor

Temperature Specifications:

• Range: -50 °C to +50 °C (-58 °F to 122 °F)
• Accuracy: ±0.10 °C (0.18 °F)
• Output: Resistive
• Sensor: Thermistor