Hydrogen Flame Ionization Detector Insulation Protection
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Solution Overview
Problem
The hydrogen flame ionization detector (FID) experiences degradation due to increased noise and baseline issues caused by a decrease in insulation between the collector and the collector housing, primarily resulting from the accumulation of conductive materials on the insulator.
Innovation Solution
An accumulation suppression structure is provided above the insulator to prevent conductive materials from accumulating and shortening the insulation distance between the collector and the collector housing, including a purge gas inlet to create an updraft, an overhanging portion to receive emitted materials, and specific surface configurations to maintain insulation distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional insulator is used to hold the collector, then the collector is electrically insulated from the collector housing, but conductive materials accumulate on the insulator causing insulation deterioration
Solution Approach 1:
An accumulation suppression structure is introduced as an intermediary element between the insulator and the upper end of the collector. This structure receives conductive materials emitted from the collector before they can accumulate on the insulator, thereby protecting the insulator's electrical insulation properties and extending its service life.
Solution Approach 2:
The accumulation suppression structure converts the harmful effect of emitted conductive materials into a manageable situation by providing a designated reception area. The structure is designed to receive and contain these materials in a controlled manner, preventing them from causing insulation deterioration while maintaining the overall system functionality.
2Device complexity
If the collector is positioned close to the collector housing, then the device structure is compact, but the insulation distance is reduced making the system vulnerable to electrical continuity
Solution Approach 1:
The accumulation suppression structure serves as an intermediary barrier between the collector and the insulator. By positioning this structure above the insulator to receive emitted materials, it prevents conductive accumulation that would otherwise bridge the insulation gap, thereby maintaining electrical insulation reliability without requiring increased spacing.
Solution Approach 2:
The accumulation suppression structure provides beforehand protection by capturing conductive materials before they can accumulate on the insulator and compromise the insulation distance. This preventive measure ensures that the insulation reliability is maintained even when the collector is positioned close to the collector housing for structural simplicity.
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
The suppression of insulation deterioration extends the life of the FID by preventing electrical continuity between the collector and the collector housing, thereby reducing noise and baseline increases.
Implementation Method 1
a purge gas inlet configured to form an updraft above the insulator by a gas introduced from the purge gas inlet into the collector housing
Implementation Method 2
A hydrogen flame is formed at the tip of the nozzle to ionize the components contained in the sample gas. The generated ions are collected by a collector, and the quantity of the ions collected by the collector is detected as an electric current.
Data Source
AI summary
A hydrogen flame ionization detector includes a nozzle configured to eject a sample gas upward, a cylindrical collector provided above the nozzle with a longitudinal direction thereof vertically oriented, the collector being configured to collect ions generated by a hydrogen flame formed at a tip of the nozzle, an insulator provided to hold the collector therein in such a manner as to extend in a radially inward direction of the collector, and a collector housing configured to accommodate the collector therein in such a manner as to surround an outer peripheral surface of the collector while holding a peripheral portion of the insulator. An accumulation suppression structure is provided above the insulator to suppress a material emitted from an upper end of the collector from being accumulated in such a manner as to shorten an insulation distance between the collector and the collector housing.