德國(guó)Flucon導(dǎo)熱系數(shù)儀LAMBDA導(dǎo)熱率測(cè)定儀熱線法測(cè)量導(dǎo)熱熱導(dǎo)率測(cè)試儀

測(cè)量流體的導(dǎo)熱系數(shù)一般用到穩(wěn)態(tài)法和瞬態(tài)法，但是由于有對(duì)流的影響，瞬態(tài)法具有很多優(yōu)點(diǎn)：

瞬態(tài)法考慮了變化的溫度場(chǎng)的問題，測(cè)量時(shí)間快得多，結(jié)果受對(duì)流影響較小。僅0.01mm/min的平均流速會(huì)導(dǎo)致由于自由對(duì)流而引起的1%的偏差。因此，穩(wěn)態(tài)方法，特別是在涉及厚層的實(shí)驗(yàn)裝置中，不能提供不受對(duì)流影響的測(cè)量數(shù)據(jù)。此外，還必須非常小心地避免任何種類的強(qiáng)制對(duì)流，例如由于測(cè)量裝置的振動(dòng)引起的。

LAMBDA系統(tǒng)是一個(gè)緊湊的，界面友好的儀器，通過根據(jù)ASTM?熱線法，可以在一個(gè)非常寬的溫度和壓力范圍內(nèi)測(cè)定導(dǎo)熱系數(shù)，適用于實(shí)驗(yàn)室和現(xiàn)場(chǎng)的流體分析連接操作，包括納米顆粒分散流體的熱導(dǎo)率測(cè)量，LAMBDA可以獨(dú)立操作或者和計(jì)算機(jī)，配備RS232接口。

  • 顯示導(dǎo)熱系數(shù)和溫度
  • 通過熱線法快速穩(wěn)定地進(jìn)行電阻測(cè)量
  • 沒有對(duì)流的影響
  • 適用于任何流體、粉末和凝膠
  • 只需要少量樣品（35ml）
  • 高重現(xiàn)性99%
  • 設(shè)置時(shí)間短
  • 易于操作
  • 可選連接到計(jì)算機(jī)，用于全自動(dòng)測(cè)量和溫度控制。
Electronic unit LAMBDA
Instationary heat wire resistance measurement in accordance with ASTM D7896
Thermal conductivity 10 to 2.000 mW/mK
Accuracy +/- 2 % reading
Reproducibility +/- 1 % reading
Repeatability +/- 0.5 % reading
Temperature sensor PT100 +/- 0.1o C
Specific heat (computed) 0.1 to 1 cal/g o C
Measuring time approx. 30 s
Display: LC-Display
Digital interface: RS 232
Analog interface: 0…10 V or 4…20 mA
(thermal conductivity)
0…10 V or 4…20 mA
(temperature)
controller interface: RS232 ( heating unit)
Housing: Design electronic housing
Size/weight (approx.): 230*350*140 mm, 3 kg
Power supply: 110-230 VAC, 50/60 Hz
Ambient temperature: 10 to 40o C
Sensor unit LAMBDA
Heat wire element: Pt
Dimensions: designed to be screwed
into measuring chamber
(see 4.3)
Material: stainless steel
Temperature sensor PT100 +/- 0.1°C
(integrated)
Sensor cable: L = 1 m
Temperature range: -50°C to 300oC
Measured medium: fluids, powders, gels &
pastes
Measuring chamber LAMBDA
Stainless steel chamber
Containment: D=36 mm, L=90 mm
Material: stainless steel
Temperature range: -50°C to 300°C
Pressure range: 0 to 35 bar
Interface cable RS232 (LAMBDA – PC)
Software LAMBDA System
(operating system WINDOWS XP and
higher versions)
恒溫配置：
Block thermostat for EPSILON+ / LAMBDA
for the fully automatic determination of the dielectric
properties of fluids as a function of temperature
Type CL-355A-230
Temperature range Room temperature to 400
degree C (by use with the
EPSILON+ up to 180° C
& up to 300°C with the
LAMBDA) Temp. stability +/- 0,3 degree C
Temp. set manually & automatically
Power supply 230 VAC, 50/60 Hz
Controller interface RS232

Related posts