Thermal Properties Sensors

Measurements:

Applications:

The KD2 Pro has a variety of sensor options. Find out which ones you need.

 

  • TR-1—Measures thrermal resistivity and thermal conductivity in soils and other porous materials.
  • RK-1—A more robust sensor that measures thrermal resistivity and thermal conductivity in hard materials like, rock, concrete and masonry. Fits into a roto-hammer bit pilot hole.
  • KS-1—A smaller sensor that measures thrermal resistivity and thermal conductivity in liquids and some porous materials.
  • SH-1—A dual-needle sensor that measures thermal resistivity, conductivity, diffusivity and specific heat in non-fluid samples.
 
SENSOR TR-1 RK-1 KS-1 SH-1
MEASUREMENT Read time- 5 Minutes Read time- 10 Minutes Read time- 60 Seconds Read time- 2 Minutes
ACCURACY (Conductivity): ± 10% from 0.2 - 4 W/(m· K)
±0.02 W/(m· K) from 0.01 - 0.2 W/(m· K)
(Conductivity): ±10% from 0.2 - 6 W/(m· K)
±0.02 W/(m· K) from 0.1 - 0.2 W/(m· K)
(Conductivity): ±5% from 0.2 - 2 W/(m· K)
±0.01 W/(m· K) from 0.02 - 0.2 W/(m· K)
(Conductivity) ± 10% from 0.2 - 2 W/(m· K)
±0.01 W/(m· K) from 0.02 - 0.2 W/(m· K)
(Diffusivity) ±10% at conductivities above 0.1 W/(m· K)
(Volumetric Specific Heat) ±10% at conductivities above 0.1 W/(m· K)
RANGES

K: 0.1 to 4 W/(m·K)

R: 25 to 1000 °C·cm/W 

K: 0.1 to 6 W/(m·K)

R: 17 to 1000°C cm/W

K: 0.02 to 2 W/(m·K)

R: 50 to 5000°C cm/W

K: 0.02 to 2.00 W /(m· K) 

R: 50 to 5000 °C·cm/W 

0.1 to 1 mm2/s (diffusivity)

0.5 to 4 mJ/(m3K) (volumetric specific heat

ENVIRONMENT –50 to 150°C –50 to 150°C –50 to 150°C –50 to 150°C
DIMENSIONS

10 cm length

2.4 mm diameter

6 cm length

3.9 mm diameter

6 cm length

1.27 mm diameter

30 mm length

1.30 mm diameter

2 needles, 6 mm spacing

SAMPLE SIZE Sample size is dependent on the thermal properties of the material being tested. In general a 2cm radius of sample material around the needle(s) is sufficient for samples with thermal conductivities around 0.5 W/mK. Samples with lower conductivity (i.e. insulation) can be tested with a smaller sample size. Samples with a higher conductivity (i.e. granite) will require a larger sample to avoid boundary effects.

KD2 Pro Sensor Compatibility

SAMPLE MATERIAL TR-1 RK-1 KS-1 SH-1
LOW VISCOSITY LIQUIDS (E.G. WATER) No No Best1 No
HIGH VISCOSITY LIQUIDS (E.G. GLYCEROL, OIL) Ok No Best No
INSULATION AND INSULATING MATERIALS No No Best5 No
MOIST SOIL Best Ok No Ok
DRY SOIL, POWDERS, GRANULAR MATERIALS Best2 Ok No Ok
CONCRETE Best3 Best3 No Ok4
ROCK Best3 Best3 No Ok4
OTHER SOLIDS Best3 Ok No Ok
VOLUMETRIC SPECIFIC HEAT No No No Best
THERMAL DIFFUSIVITY No No No Best

1 In low viscosity liquids, the read time should be set to the minimum allowed 1 minute to avoid free convection.

2 In dry granular materials where contact resistance can be significant, extending the read time to the maximum allowed 10 minutes will produce the most accurate results.

3 In solid materials where a pilot hole has been drilled and contact resistance can be significant, using thermal grease and extending the read time to the maximum allowed 10 minutes will produce the most accurate results.

4 The SH-1 sensor will take accurate measurements in rock and cured concrete, but it is very difficult to drill small small diameter, parallel holes in these materials to accommodate the SH-1 needles.

5 The KS-1 needle in default mode (Low Power, 1 min read time). Heater temperatures with the other probes are too high for insulation measurements.

 

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TR-1 Sensor

The large (10cm long, 2.4mm diameter) single needle TR-1 sensor measures thermal conductivity and thermal resistivity (part number 40352). The TR-1 was designed for us in soil, concrete and other granular or solid materials. If measuring cured concrete (or any other material that requires drilling…

RK-1 Sensor

The 6cm long, 3.9mm diameter single needle RK-1 sensor measures thermal conductivity and thermal resistivity (part number 40351). The RK-1 was designed for us in rock, concrete and other solid materials that require the drilling of a pilot hole. The RK-1 sensor should not be used in liquids. See…

KS-1 Sensor

The small 6cm long, 1.3mm diameter single needle KS-1 sensor  (part number 40354) measures thermal conductivity and thermal resistivity of liquids and insulating materials.  See the sensor comparisons tab on the KD2 Pro page for a side-by-side comparison of the sensors. Contact us…

SH-1 Sensor

The dual needle SH-1 sensor (3cm long, 1.3mm diameter, 6mm spacing) measures volumetric heat capacity, thermal diffusivity, thermal conductivity, and thermal resistivity (part number 40353). The SH-1 is compatible with most solid and granular materials.  The SH-1 sensor should not be used in…