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Buck Scientific

热导检测器(TCD)

热导检测器(TCD)

  • 通用探测器
  • 检测范围从 100% 到 200-500 ppm
  • 轻松更换灯丝
  • 恒温高达 275°C

热导检测器 (TCD) 可检测所有分子,常用于固定气体分析( O2N2 、CO、 CO2H2S 、NO 等),因为目标分析物在其他更灵敏的检测器上响应不佳。TCD 可检测从 100% 到约 100 ppm 的浓度,基线平坦且峰形尖锐。当峰宽或基线不平坦时,300 ppm 的检测限更为现实。对于更低的检测限,HID 检测器可能更适合无机物,而 FID 检测器则可为碳氢化合物提供 1ppm 的检测限。

该色谱图显示 0.5mL 10,000 ppm (1%) CO2 从
使用 1 米硅胶填充柱在 80°C 下对空气进行分析。

TCD 由四根钨铼灯丝组成,构成惠斯通电桥。电流流过灯丝,使其升温。载气(通常为氦气,导热性极高)流过灯丝,以恒定的速率带走热量。其中两根灯丝仅暴露于载气(参比),另外两根暴露于载气/样品流。当导热性低于载气的样品分子离开色谱柱并流过两根样品灯丝时,灯丝的温度会升高。温度升高会使惠斯通电桥失去平衡,并在样品分子通过检测器时产生峰值。

如果 GC 未检测到载气压力,灯丝保护电路会切断电流,从而防止灯丝损坏,但并非在所有情况下都能防止灯丝损坏。TCD 配备用户可更换的灯丝,以防灯丝烧坏。

常规价格 $1.00 USD
常规价格 促销价 $1.00 USD
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GC Accessories

Frequently Asked Questions

How can I contact you?

Feel free to call us T+86 189-6516-4839
or email  sales@nwspec.com to:

• Place an order
• Ask for a quote
• Or if you have any other questions

You will always get a live person here at NWSPEC; never an automated system! 

We are open from 6:00AM - 7:00PM Eastern Time, Monday - Friday. 

Where can I find application notes?

If you have any questions regarding the application notes, or can't find the one you are looking for, please contact Sales at sales@nwspec.com



Do you have instructional manuals for your instruments to download?

Yes, we have instructional manuals for our instruments. They can be found on https://nwspec.com/pages/resource .

If you don't see the one you are looking for, please contact: sales@nwspec.com



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