Hot Disk – Sensors
Hot Disk – Sensors
A variety of sensor materials and sizes allow for adaptation to the specific applicationSensors with Kapton, Teflon and mica insulation are available for various applications and temperature ranges. A wide range of sizes allows you to adapt the sensor to different sample geometries.
Product Description
The hot disc sensor consists of a nickel double helix that serves both as a heat source and to measure the temperature rise during the measurement.
During the actual measurement, a current flows through the nickel spiral and it heats up. Depending on the thermal conductivity of the sample enclosing the sensor, this heat flows more or less well and quickly to the environment (sample). At the same time, the electrical resistance of the nickel spiral is measured with high resistance, which changes depending on the temperature. The temperature change (temperature rise) plotted against time produces the transient curve from which the measurement results are determined.
The sensors for standard measurements are round and available in different sizes. Depending on the material, sensors with radii from 0.5 mm to 30 mm are available. Customised products are also available on request. Special sensors are available for optional measuring techniques such as cp module or thin film module. Rectangular sensors are also available for special applications. Various cable materials and sample holders complete the perfect customisation to your requirements.
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Specifications
Depending on the intended use of the sensors, the sensor cables and sample holders must be selected accordingly.Kapton sensors
:
Temperature range: -196°C to 300°C (up to 400°C in a vacuum)
Available sizes:
Type / Radius (in mm)
7531 / 0.5
102003 / 0.9
7577 / 2.0
7577Q / 2.0 (with larger Kapton surface area)
5465 / 3.2
5465Q / 3.2 (with larger Kapton surface area)
5501 / 6.4
5501Q / 6.4 (with larger Kapton surface)
8563 / 9.9
4922 / 14.6
4922L / 14.6 (with extended lead)
5599 / 29.5
5599L / 29.5 (with extended lead)
The 7531 and 7577 sensors are not suitable for anisotropy measurements.
Sensors with a larger Kapton surface area are particularly suitable for liquids and melts.
Sensors with an extended lead are particularly suitable for larger samples with high thermal conductivity.
Kapton sensors (thin film module):
Temperature range: -196°C to 300°C (up to 400°C in vacuum)
Available sizes:
Type / Radius (in mm)
7854 / 10.5
7280 / 14.7
7281 / 30.0
Kapton sensor: (cp module):
with applied gold cell (max. sample size 19 mm Ø
x 5 mm thick)
Temperature range: -196°C to 150°C
Mica sensors:
Temperature range: 300°C to 600°C or 1000°C (under inert gas/vacuum)
Available sizes:
Type / Radius (in mm)
5465 / 3.2 (only for samples with λ > 5 W/mK and known cp)
5082 / 6.6
4921 / 9.7
4922 / 14.6
4922L / 14.6 (with extended lead)
5599 / 29.5
5599L / 29.5 (with extended lead)
Mica sensors exhibit increased wear at high operating temperatures and should be regarded as consumables under these operating conditions.
Teflon sensors
:
Suitable for Standard, Anisotropy, Slab, One-dimensional and Structural Probe modules.
Temperature range: -196°C to 250°C
Type / Radius (mm)
7577 / 2.0
5465 / 3.2
5501 / 6.4
The 7577 sensor is not suitable for anisotropy measurements.
Options and Accessories
• Temperature
control equipment• Sample
holders• Special sensors available on request
Applications
See Hot Disk systems
