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Method for correcting temperature-causing changes in process of detecting oxygen and nitrogen analyzer thermal conductivity cell

A technology of detection process and thermal conductivity cell, applied in the direction of material resistance, etc., can solve the problems of wasting time and wasting carrier gas, saving time and gas, and correcting the effect of voltage

Active Publication Date: 2012-11-21
上海宝英光电科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this way, both time and carrier gas are wasted

Method used

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  • Method for correcting temperature-causing changes in process of detecting oxygen and nitrogen analyzer thermal conductivity cell

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Embodiment Construction

[0015] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0016] In order to solve the problems of the technologies described above, the present invention is achieved through the following steps (as figure 1 shown): is achieved through the following steps:

[0017] 1. At the beginning of the experiment, only the carrier gas is introduced to collect the voltage value data output by a thermal conductivity cell, and the average value is taken as a reference point;

[0018] 2. Based on this reference point, calculate the slope of the straight line formed by each collected data and the reference point; each of the collected data is continuously collected by the AD sampling card at a fixed time interval. The voltage output by the cell;

[0019] 3. The starting point of the waveform: when the rate of change of this slope exceeds the preset range compared with the previous slope, this point is the starting p...

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Abstract

The invention relates to a method for correcting temperature-causing changes in the process of detecting an oxygen and nitrogen analyzer thermal conductivity cell, which is implemented by the following steps: feeding in carrier gas, acquiring voltage value data output by a section of the thermal conductivity cell, and using an average value thereof as a reference point; on the basis of the reference point, calculating the slope of a straight line formed by every acquired data and the reference point; starting point of waveform: when the change rate exceeds a preset scope in case that the slope is compared with previous slope, the point is the starting point of waveform; crest of waveform; endpoint of waveform; and forming a straight line from the starting point to the endpoint of waveformas a reference line of V0 and calculating the area by waveform data according to this reference line so that content of the gas to be detected can be calculated; the method has the advantage that: assingle V0 value is changed into a changing V0 slope, the influence of working temperature on voltage is corrected; and time and gas are saved.

Description

technical field [0001] The invention relates to a thermal conduction pool detection, in particular to a method for correcting changes caused by working temperature during the thermal conductivity pool detection process. Background technique [0002] TC-306 oxygen and nitrogen analyzer adopts thermal conductivity cell detection method when measuring nitrogen. The thermal conductivity cell detector is a detection device based on gas heat conduction and thermal resistance effect. The process of detecting gas concentration is realized through heat exchange and thermal balance between thermal resistance (tungsten-rhenium wire element) and the measured gas. This method has the advantages of high sensitivity and good linearity, but there are many factors that affect the thermal conductivity signal: the change of operating temperature, the change of the thermal conductivity bridge current, the purity of the carrier gas and the change of the gas flow will all affect the thermal condu...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/18
Inventor 黄晓文
Owner 上海宝英光电科技有限公司