热导检测器（TCD，Thermal Conductivity Detector）中平衡柱的主要作用是维持参比气流和检测气流的对称性，从而提高检测器的稳定性和灵敏度。
 

1. 平衡气流阻力
TCD通过比较参比气流（纯载气）和检测气流（含样品的载气）的热导率差异来工作。两路气流需保持相同的流速和压力。
平衡柱的阻力与分析柱（分离样品的色谱柱）相匹配，确保两路气流的流动条件一致，避免因阻力不均导致基线漂移或噪声。
2. 补偿温度和载气波动
平衡柱通常与分析柱使用相同的固定相和尺寸，填充惰性材料（如空柱或去活化填料），可缓冲因温度变化或载气波动对参比气流的影响，使检测器输出更稳定。
3. 对称性设计
TCD的参比池和检测池需在完全对称的条件下工作。平衡柱的存在使两路气流经历相似的路径和条件，减少非样品因素引起的信号干扰。

 

名称：平衡柱

规格：2m*1/8

型号：HH-PX-II

zui高使用温度：200°C

应用：安捷伦，岛津，赛默飞，瓦里安，布鲁克，PE

 

The main function of the balance column in a Thermal Conductivity Detector (TCD) is to maintain the symmetry between the reference airflow and the detection airflow, thereby improving the stability and sensitivity of the detector.
1. Balance airflow resistance
TCD works by comparing the difference in thermal conductivity between the reference gas flow (pure carrier gas) and the detection gas flow (carrier gas containing the sample). Two streams of air need to maintain the same flow velocity and pressure.
The resistance of the equilibrium column is matched with the analytical column (chromatographic column for separating samples) to ensure consistent flow conditions of the two gas streams and avoid baseline drift or noise caused by uneven resistance.
2. Compensate for temperature and carrier gas fluctuations
Balanced columns typically use the same fixed phase and size as analytical columns, filled with inert materials (such as empty columns or deactivated fillers), which can buffer the effects of temperature changes or carrier gas fluctuations on the reference gas flow, making the detector output more stable.
3. Symmetrical design
The reference and detection pools of TCD need to operate under completely symmetrical conditions. The presence of a balance column causes two streams of air to experience similar paths and conditions, reducing signal interference caused by non sample factors.
Name: Balance Column
Specification: 2m * 1/8
Model: HH-PX-II
Maximum operating temperature: 200 ° C
Applications: Agilent, Shimadzu, Thermo Fisher, Varian, Brooke, PE