2 KD2 PRO OVERVIEW KD2 Pro
RK-1
Note: The RK-1 is optional and not included with the standard KD2
Pro
The thick (6 cm long, 3.9 mm diameter) single needle RK-1 sensor
measures thermal conductivity and thermal resistivity. We designed
the RK-1 specifically for use in hard materials like rock or cured
concrete, where you must use a rotary hammer to drill a hole to ac-
commodate the sensor. The TR-1 sensor is generally more accurate
than the RK-1 sensor and is the preferred choice in granular and
solid materials as long as you can make a hole to accommodate the
longer and thinner sensor. In instances where the material is too
hard to drill a hole for the long, thin TR-1 sensor, a
5
32
or 4 mm
rotary hammer bit (included in the RK-1 kit) can be used to drill
a pilot hole in the material. Make sure to remove any dust or drill
cuttings from the rotary hammer hole using a swab or compressed
air before inserting the RK-1 sensor. It is also necessary to use the
included thermal grease to ensure good thermal contact between the
RK-1 sensor and the test material.
Note: Do not use the RK-1 sensor in liquid samples.
Read Time
The read time is the time, in minutes, the KD2 Pro takes to gather
data for computing thermal properties. It applies heat to the sensor
for half of the set time, and takes measurements over the full time.
The KD2 Pro waits thirty seconds for temperature equilibration be-
fore heating starts, so the entire measurement time should be the
“Read Time” plus 30 seconds. The sensor takes sixty temperature
readings during the read time, so the number entered here also de-
termines the number of seconds between temperature readings. This
number displays in the upper right corner of the screen and is avail-
able with each data record after downloading. Default read times
are one minute for the KS-1 sensor, two minutes for the SH-1 sensor,
five minutes for the TR-1 sensor, and ten minutes for the (optional)
RK-1 Sensor.
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