Small and versatile, ideal for many applications
Versatile and inexpensive Dual Needle Heat Pulse Specific Heat Sensor for use in many research applications.
The East 30 Sensors Specific Heat Sensor uses DNHP technology to take accurate measurements of Specific Heat in many situations including:
Soil Water Content monitoring
Specific Heat measurements
Laboratory and Field applications
Thermal Diffusivity and Conductivity Measurements
The Specific Heat sensor is designed to be simple and rugged for use in many environments. This sensor uses the Dual Needle Heat Pulse method to make reliable and repeatable measurements in almost all applications. One needle contains a heating element, and the other a precision Thermistor for highly precise temperature measurements.
Accuracy: ± 5%
Head is 35mm x 10mm
Needles 30mm x 1.27mm in diameter
10K Precision Thermistor
Epoxy and Delrin head
Stainless Steel needles
2m standard (additional cable available)
The Specific Heat Sensor consists of a pair of 30mm-long stainless steel needles, spaced 6mm apart. It is a Dual Needle Heat Pulse sensor (DNHP). One needle contains an Evanohm heater, and the other contains a Precision 10K Thermistor. After the sensor needles are inserted into the sample, a current is applied to the heater for 8 seconds. The temperature rise of the thermistor is then monitored. The specific heat of the material is inversely proportional to the height of the sensed temperature rise, and the thermal diffusivity of the material is related to the time taken for the pulse peak to pass the temperature sensor. The thermal conductivity can then be computed as the product of the thermal diffusivity and the specific heat.
Bristow, K.L., R.D. White, and R. Horton, 1994. Measurement of Soil Thermal Properties with a Dual-Probe Heat Pulse Technique. Soil Sci. Soc. Am. J. 55:291-293
Bristow, K.L., J.R. Bilskie, G.J. Kluitenberg, and R. Horton, 1995. Comparison of Techniques for Extracting Soil Thermal Properties from Dual Probe Heat Pulse Data. Soil Sci. Am. J. 1:160
Campbell, G.S., C. Calissendorff, and J.H. Williams, 1991. Probe for Measuring Soil Specific Heat Doing a Heat-Pulse Method. Soil Sci. Soc. Am. J. 55:291-293
Kluitenberg, G.J., J.M. Ham, and K.L. Bristow, 1993. Error Analysis of the Heat Pulse Method for Measuring Soil Volumetric Heat Capacity. Soil Sci. Soc. Am. J. 57:1444-1451