5 TAKING MEASUREMENTS KD2 Pro
the TR-1 sensor in these types of materials.
3. Do not bend the needles. Needle spacing on the SH-1 sensor
is critical for accurate measurements. A 1% change in needle
spacing results in a 2% error in measurement of diffusivity and
specific heat. A guide is provided for maintaining proper needle
spacing during insertion of the sensor into a sample. The Delrin
verification block included with your system shows the correct
sensor spacing. If a needle is slightly bent, it can be carefully
straightened until the tip spacing matches the hole spacing in
the calibration block.
5.2 Measurements in Concrete or Rock
The best method of using the KD2 Pro for measurements in concrete
or Fluidized Thermal Backfill
TM
is to mold pilot holes in wet concrete
using the pilot pins furnished with your KD2 Pro. Follow these four
steps to install the pilot pin.
1. Coat pilot pin with thermal grease or Vaseline.
2. Install pin at least 10 cm deep while concrete is wet. Do not
bury the pin or it becomes hard to grip for removal.
3. Remove pin when concrete dries.
4. Coat the TR-1 sensor with thermal grease, insert sensor into
the cast hole and begin to take readings.
If you need to take measurements in rock samples or cured concrete,
use the optional RK-1 sensor. The RK-1 sensor kit includes a “5/32”
rotary hammer bit to drill pilot holes that accommodate the RK-1
sensor. (4 mm rotary hammer bits are also acceptable). After drilling
the holes, be sure to clean the dust and drill cuttings from the rotary
hammer hole using a swab or compressed air before inserting the RK-
1 sensor. It is also necessary to apply a liberal coat of the thermal
grease on the needle to ensure good thermal contact between the
RK-1 sensor and the test material.
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