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조회 수 : 15186
2012.06.19 (15:50:00)
Product Category:  Thermal Conductivity Meter 
Standard:  ISO 8302
EN 1946-2
EN 12667
EN 12664
EN 12939
ASTM C177
(DIN 52612) 
Output Properties:  Thermal transition resistance, R (m²·K/W)
Thermal conductivity, λ (mW/m·K) 
Application:   

Thermal Conductivity Test Tool λ-Meter EP500

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The Thermal Conductivity Test Tool λ-Meter EP500e (guarded hot plate apparatus) is a tool according the guarded hot plate method for the operation of tests on the absolute values of thermal conductivity, thermal transfer resistance as well as the k-value and U-value respectively of insulation materials, construction materials and other products. Tests are done in accordance with ISO 8302, EN 12667, ASTM C177 and a high measurement accuracy as required by test authorities. Test are completed within a short measurement time as often requested by the worksown production control.

 

Design and Function of the Guarded Hot Plate Apparatus

The Thermal Conductivity Test Tool λ-Meter EP500e (guarded hot plate apparatus) is a test tool based on an Embedded-PC for absolute value measurements on guarded hot plate method according to ISO 8302, DIN EN 1946-2, DIN EN 12667 and ASTM C177 (DIN 52612). The Thermal Conductivity Test Tool λ-Meter EP500e (guarded hot plate apparatus) measures the sample thickness d of the inserted sample, the temperature difference ΔT over the sample and the heat flux Q which is equivalent to the electrical power of the measuring heating P (= U ⋅ I). The thermal conductivity is determined based on the defined measurement area A and the one-dimensional thermal conduction as follows:

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It is not a heat flow meter and therefore it offers a higher accuracy induced by principle than the most other offered test tools. It is designed for long-term use and does not require calibration even after years.

The use of modern technologies for designing the sensor plates enables to go without a measurement chamber environment, which is standard otherwise. It is therefore easier to handle.

The Thermal Conductivity Test Tool λ-Meter EP500e (guarded hot plate apparatus) does not require a thermo stationary controlled measurement environment. It must be plugged into the regular power supply and can be used in any room or office.

It makes very little noise (like a PC) and dissipates very little heat. The advanced control algorithm of the test tool calculates for each measurement the optimal measurement parameters and reduces the measurement time to a minimum.

The Thermal Conductivity Test Tool λ-Meter EP500e (guarded hot plate apparatus) is a compact desktop tool.

 

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Characteristics and Operations Scope of the guarded hot plate apparatus λ-Meter EP500e

If you decide to invest in a thermal conductivity test tool you should opt for the guarded hot plate apparatus in accordance with ISO 8302, EN 1946-2. It features major technological improvements compared to the frequently used heat flow meters according to ISO 8301, EN 1946-3.

The single-specimen thermal conductivity test tool λ-Meter EP500e is a guarded hot plate apparatus and measures the thermal conductivity, thermal resistance as well as the k-value and U-value respectively of an insulating material and other products. Tests are done in accordance with ISO 8302, EN 1946-2, EN 12664, EN 12667, EN 12939, ASTM C177 and DIN 52612. and a high accuracy as required by test authorities.

It has been approved for use by test institutes or (higher education) institutes as well as for internal factory production control.

Completely new in the design is that stationary thermal conditions can be achieved in the measurement zone. Three protective heating rings and a thermostatic heating ring (can be used for heating and cooling) are separated by gap controls and can be controlled individually to allow for convenient handling. The open design has a greater potential for automated solutions. It does not require a thermostatically controlled measurement chamber indispensable for the regular tool-type.

Technical Data

Measurement Mode

single measurement or series of up to 3 single measurements
at different arbitrary temperatures

Measurement Temperature

freely selectable in the range of 10 °C up to 40 °C

optional

down to -10 and up to 50 °C

Temperature Difference

freely selectable in the range of 5 K up to 15 K

Measurement Range

R = 0,250...5,0 m²·K/W and λ = 3...250 mW/m·K

optional

R = 0,125...5,0 m²·K/W and λ = 3...500 mW/m·K

optional

R = 0,025...0,25 m²·K/W and λ = 0,25...2,0 W/m·K

Sample Thickness

10 up to 120 mm

optional

<10 up to 200 mm

Sample Dimensions

optimal: 500 x 500 mm², measurement zone size at minimum

Measurement Zone

selectable: 250 x 250 mm², 200 x 200 mm², 150 x 150 mm²

Reproducibility

< 0,5 % (mostly < 0,2 %)

Measurement Accuracy

< 1,0 % for thicknesses < 90 mm and λ = 10...60 mW/m·K

(mostly < 0,7 %)

The prototype had been used for comparative tests by the FIW Munich (see no: CE 1-1/99).

Dimensions

(Length x Width x Height)

63 x 63 x 88 cm³

Mass

ca. 85 kg

Power Supply

230 V / 50 Hz

Power Consumption

max. 450 W

Protection Class / Degree of
Protection

I / IP 20

Cooling-/Heating unit:

12 air-cooled high performance Peltier modules

 

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Selected Thermal Conductivity Test Tool λ-Meter EP500e
Lambda-Messtechnik, Germany
Output Properties: Thermal transition resistance, R (m²·K/W) Thermal conductivity, λ (mW/m·...
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