Fredlund Thermal Conductivity Sensor
Testing accessories and preparation equipment
FTC-100 Fredlund Thermal Conductivity Sensor


The GCTS FTC-100 Fredlund Thermal Conductivity Sensor was engineered as an unsaturated soil sensor and is ideal for measuring soil suction and temperature in the field.

 

  • Digital design
  • Transmission of data over 100 m without affecting signal quality
  • 1 to 1,000 kPa range
  • 5% accuracy
  • Accurate for all soil types
  • Measurements are unaffected by soil water salinity
  • Moisture barrier protects electronics from unfavorable moisture infiltrations
  • Special burial cable permits long-term installation in moist environments
  • 12V battery pack and a solar panel can be provided as power supply

 

The Fredlund Thermal Conductivity Sensor (FTC-100) is an unsaturated soil sensor for measuring soil suction and temperature in the field. The system consists of ceramic-tipped sensors, a suction sensor controller (data logger), and a power supply. Typically, 16 sensors are included with 10 m (30 ft.) of cable for each sensor. The data logger consists of a 16-channel multiplexer that can be connected to a laptop or PC. Power is supplied with a 12-Volt battery pack and a solar panel.

 

The sensor tip has a miniature heating element and a temperature sensor embedded in the center. The heating curve of the sensor is obtained by sending a controlled current to the heating element. The temperature rise in the sensor after heating depends on the water content of the sensor, which is a function of the surrounding soil suction. Calibration curves developed in the laboratory are provided to obtain the suction corresponding to field measured change in temperature.

 

SPECIFICATIONS

Accuracy: . . . . . . . . . . . . . . . . 5% (for calibrated sensors)*
Range: . . . . . . . . . . . . . . . . . . 1 to 1,000 kPa
Cable Length: . . . . . . . . . . . . . up to 100 m
Controller: . . . . . . . . . . . . . . . .16 Channels
Power: . . . . . . . . . . . . . . . . . . .12 VDC
Software: . . . . . . . . . . . . . . . . .Windows based

 

SHIPPING

(Full System w/ 16 Sensors)

Weight: . . . . . . . . . . . . . . . . . 25 kg
Dimensions: . . . . . . . . . . . . . .60 x 60 x 60 cm

* Sensors calibrated in wetting only and for 500 kPa range