The Sweating Guarded Hotplate simulates the heat and mass transfer processes which occur next to human skin. Measurement of thermal resistance and water vapor resistance under steady state conditions of a range of products including fabrics, films, coatings, foams and leather including multi-layer assemblies.

PRINCIPLES
The specimen to be tested is placed on an electronically heated porous plate with conditioned air ducted to flow across and paralledl to its upper surface.

INSTALLATION
The instrument includes the test enclosure into which is constructed the measuring unit and thermal guard, and in which the ambient air temerature, air speed and relative humidity are conrolled, However the entire system must be operated in conditions conforming to ISO 139:2005 Textiles-Sttandard Atmospheres for Conditioning and Testing.

UTILITIES REQUIRED
Requires 20 amp single phase electrical supply
Supply of triple distilled water (not plumbed)

ADDITIONAL SPECIFICATIONS
- Thermal resistance (Rct) test range: 0.002 - 2.0 m�K/W
- Vapor resistance (Ret) test range: 5 - 1000m�Pa/W
- Maximum test specimen sizes:
- 300 x 300mm for specimen thickness < 5mm
- 214mm x 214mm for test specimen thickness from 5-70mm
- Hotplate: 3mm porous bronze plate 200mm x 200mm
- Hotplate temperature control at 35�C �0.1�C
- Thermal guard temperature control at 35�C �0.1�C
- Enclosure: Conditioned air flows parallel to Hotplate and Thermal Guard
- Air duct height: 55mm ?mm above the working platform
- Air temperature range 18�C-40�C �0.1�C
- Relative humidity 30-70% �3%
- Air temperature accuracy during test �0.5�C for thermal resistance and vapor resistance < 0.5 m�K/W and 100 m�Pa/W
- Air flow speed 1�0.05 m/s, measured 15mm above the working platform at 20�C air temperature

Supplied with laptop computer, USB connection cable and M259 software disc

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