Gas Sensor Housing Passage for Fast Response Under Pressure
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Solution Overview
Problem
Existing gas sensing devices face challenges in accurately measuring dissolved gas concentrations in real-time due to pressure increases within the housing, which hinder the movement of evaporated gas to the sensing electrode, especially when the sensor is heated to high temperatures.
Innovation Solution
The device incorporates a connection passage connecting openings in the housing to maintain communication with external air, allowing for a circulation path that facilitates gas movement to the sensing electrode, even under high pressure conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor unit is heated to high temperature to operate the gas sensor, then the sensing capability is improved, but the pressure inside the sealed space increases which hinders gas evaporation and movement to the sensing electrode
Solution Approach 1:
The sealed space is divided into a first sealed space containing the sensing electrode and a second sealed space containing the gas separation membrane, connected through a connection passage. This segmentation allows the sensor unit to be heated for improved sensing capability while the connection passage provides a pressure relief path, preventing excessive pressure buildup that would hinder gas movement to the sensing electrode.
2Measurement precision
If the dissolved gas concentration is measured by extracting gas from liquid sample and analyzing by gas chromatography, then measurement accuracy is improved, but real-time measurement capability is lost
Solution Approach 1:
A gas separation membrane is introduced as an intermediary between the liquid sample and the sensing electrode. The membrane allows dissolved gas to permeate from the liquid into the second sealed space, where it can be detected by the sensor unit. This intermediary approach enables real-time measurement while maintaining measurement accuracy, eliminating the need for time-consuming gas chromatography analysis.
3Reliability
If the sensing electrode is disposed in the sealed space, then electrode deterioration is prevented, but gas evaporation and movement to the sensing electrode becomes difficult due to pressure increase
Solution Approach 1:
The invention introduces a spatial dimension by creating a connection passage between the first sealed space (containing the sensing electrode) and the second sealed space (containing the gas separation membrane). This additional pathway allows gas to move from the liquid through the membrane into the first sealed space without being hindered by pressure increases, maintaining fast gas movement speed while keeping the sensing electrode protected in the sealed environment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enables rapid and accurate measurement of gas concentrations by ensuring smooth gas transfer to the sensing electrode, despite increased pressure within the housing.
Implementation Method 1
a gas separation membrane that separates a liquid and a gas
Implementation Method 2
a heater for heating the sensor unit to a high temperature
Implementation Method 3
evaporation of the dissolved gas in the sealed space and movement thereof to the sensing electrode of the sensor unit
Data Source
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AI summary
Proposed is a gas sensing device. The gas sensing device includes a housing including an opening part through which a target gas to be sensed enters an inner space thereof, a sensor unit disposed in the inner space of the housing, and a connection passage connecting a first opening and a second opening that are formed in the housing such that the first opening and the second opening are open toward the inner space of the housing. According to the present disclosure, there is an effect that the gas sensing device capable of measuring a concentration of a gas with a high response speed and a high accuracy may be provided even if a pressure of a space inside the housing where the sensor unit is disposed increases.