Photoionization Detector Water Removal by Electrolysis
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Solution Overview
Problem
Photoionization detectors (PIDs) face inaccuracies due to water accumulation from high humidity, leading to false signals and inefficient energy consumption in conventional water removal methods.
Innovation Solution
A method to detect and electrolyze water within the PID using switches and circuitry configurations to maintain accurate signal readings by eliminating water, ensuring energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional water removal methods are used in high humidity environments, then water accumulation is reduced, but energy consumption increases and signal accuracy deteriorates
Solution Approach 1:
The patent changes the electrical parameter (applying a voltage pulse) to the water molecules in the sensing chamber, causing them to electrolyze and decompose into hydrogen and oxygen gases. This parameter change approach allows water removal without continuous energy consumption, resolving the contradiction between signal accuracy and energy efficiency
Solution Approach 2:
The patent converts the harmful effect of water accumulation (which causes false signals) into a beneficial outcome by using the electrical pulse to electrolyze the water. The water that causes problems is transformed through electrolysis into removable gas products, turning the harmful moisture into a removable byproduct that improves signal accuracy without continuous energy input
2Reliability
If high voltage is applied continuously to electrolyze water, then water removal effectiveness improves, but energy consumption increases
Solution Approach 1:
The patent applies voltage in periodic pulses rather than continuously. The control circuit activates the voltage source only when water accumulation is detected, creating a periodic action pattern. This maintains effective water removal while minimizing energy loss by keeping the system inactive during dry periods
Solution Approach 2:
The system incorporates a sensor that automatically detects water accumulation and triggers the electrolysis process only when needed. This self-service mechanism ensures water removal effectiveness while avoiding unnecessary energy consumption, as the high voltage is applied only when the system itself detects the problem
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 solution effectively removes water from the PID, maintaining consistent signal readings and reducing energy consumption while addressing humidity-related inaccuracies.
Implementation Method 1
The UV light photo ionizes trace organic compounds, but not the air, resulting in electrons being ejected and forming positively charged molecules
Implementation Method 2
a third electrode is positioned in the sensing chamber and the circuit is operative to apply a voltage across the third electrode and the first sensing electrode, the voltage being of sufficient magnitude to reduce condensation within the sensing chamber by hydrolysing any droplet of condensation in electrical contact with the first and third electrodes
Data Source
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AI summary
A photoionization detector, PID, comprising: a bias electrode (110); a signal electrode (115); and a processing circuitry configured to: monitor a signal between the signal electrode (115) and the bias electrode (110), determine whether the signal is above a threshold to indicate that water is present in the PID, and, in an instance in which the signal is above the threshold, the circuitry is further configured to close a leakage switch (315) to thereby connect the signal electrode (115) to at least one of a reference voltage or a ground in order to allow current to flow through the bias electrode (110) and the signal electrode (115) so as to electrolyze one or more particles of water present in the PID.