CS505-L

Fuel Moisture Sensor

Retired Product
(not available for purchase)
Automatic fuel moisture measurements can be made using our CS505 Fuel Moisture sensor. The CS505 measures the moisture content of a ponderosa pine dowel that is designed to USFS specifications and are also used on the traditional weighing fuel moisture racks.

The CS505 produces a ±2.5 volt square wave. The frequency of the square wave is read using the pulse or analog channel of a Campbell logger and is then converted to fuel moisture % using a quadratic calibration. The response is similar to the traditional weighing racks because the entire dowel surface is exposed for moisture exchange.


Features

  • Measures moisture content of USFS-specified, 10-hour, Ponderosa pine dowel
  • Dowel dimensions are the same as those used in fuel moisture racks
  • Dowel is easily replaced in the field

Specifications

  • Operating range: 0 to 70% moisture content
  • Power supply: 9 to 18 Vdc
  • Accuracy ±1% rms @ 0 to 10% moisture content; ±2.4% rms @ 30 to 40%
  • Current use: 70 mA active/10 µA quiescent
  • Output signal: ±2.5 Vdc square wave with an output frequency of 600 to 1500 Hz