The Vigilant Aircraft Hygrometer is a rugged, shock mounted instrument used for the measurement of dew or frost point in flight or in installations with existing flow, such as wind tunnels. Commonly used in government and private applications in atmospheric studies, hurricane measurements, pollution studies, cloud and ice formation, and wind tunnel profiling.

The Vigilant features a miniature, remote, primary method chilled mirror dew/frost point sensor employing a platinum resistance thermometer, and has 15 feet of interconnecting cable to the control unit. Custom cable lengths are available. Alternately, the sensor may be permanently mounted to the control unit. Precision calibration units for the linear analog outputs are included.

The specially designed remote dew/frost point sensor can be mounted through the skin of the aircraft on either the left or right side. The chilled mirror dew/frost point detection method utilized assures precision accuracy, high repeatability and high reliability. 

Features:

     Designed for atmospheric sciences

     Measures dew/frost points in flight

     Rugged shock-mounted instrument

     Choice of left or right-side of aircraft mounting

     90 to 240 Vac operating power

     Two or three stage sensors available to fit specifications

     Military qualified

Five soft keys for setup and operation:

     Displayed parameter selection, °C/°F toggle

     View/change time, date, digital averaging, baud rate

     Manual Auto Balance Cycle initiate

     Program Auto Balance Cycle for start time, interval, output

     Track/Hold

     Maximum Heat toggle

     Maximum Cool toggle

     View/change high and low limits for analog outputs

     View/change alarm parameters, high/low limits, high or low  alarms, latched or unlatched relays

      Reset front panel alarm indicators, latched only