Guarded Hot Plate – The Absolute Method for Testing Insulation Materials
Guarded Hot Plate – The Absolute Method for Testing Insulation Materials
Measuring devices of the GHP 900 series, which are especially designed for thicker specimens with a high gross DensityThe mass density is defined as the ratio between mass and volume. density, are suitable for a wide range of applications. The design of the device permits samples to be inserted into the test chamber from any side. This allows for the insertion of heavy and complex samples without damaging the measuring plates. Data acquisition and control of the device are handled by the external Lambda Control desktop device alongside a PC with Windows operating system and Lambda software.
Guarded Hot Plate – Principle of Operation
The hot plate and the guard ring are sandwiched between two samples of the same material and approximately the same thickness, d. Cold plates are placed above and below the samples. All plate temperatures are controlled such that a well‐ defined, user‐selectable temperature difference, ΔT, is established between the hot and the cold plates – and thus across the sample thickness. The guard ring is maintained exactly at hot plate temperature in order to minimize lateral heat losses.
Specifications
All features at a glance
- Large Thermal ConductivityThermal conductivity (λ with the unit W/(m•K)) describes the transport of energy – in the form of heat – through a body of mass as the result of a temperature gradient (see fig. 1). According to the second law of thermodynamics, heat always flows in the direction of the lower temperature.thermal conductivity measuring range up to 2.0 W/(m·K)
- Fully insulated guarded test chamber, designed for specimens with a thickness up to 260 mm
- Available as 1- or 2-specimen measurement method according to ISO 8302 (chapter 1.6.2)
- Easy specimen change from any side
- Integrated digital measurement of specimen thickness and sample pressure
- Motorized lifting of the upper plate
- Network capability
- Control, data acquisition and data processing via external PC and Lambda software
- Variable dimensions of heating plates; heating area from 200 mm x 200 mm up to 500 mm x 500 mm
- Square-shaped or rectangular areas for a variety of specimen dimensions
- Cold plates and guarded chamber are controlled by chiller systems
| GHP 900 | |
|---|---|
| Measuring range | 0.005 to 2.0 W/(m·K), depending on material and thickness |
| Specimen size (L x W) |
900 mm x 900 mm variable, according to the dimension of the hot plate: 200 mm x 200 mm up to 500 mm x 500 mm |
| Specimen thickness (H) |
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| Temperature range |
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| Interface | 1x RS 232,1x Gigabit Ethernet |
| Dimensions (H x W x D) | 233 cm x 146 cm x 126 cm (opened hood) |
| Power supply | 110 V to 230 V, 50/60 Hz |
| Weight | 278 kg |
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