Gas Detector Enclosure Layout for Fast Leak Response
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Solution Overview
Problem
Gas detectors in refrigerated cargo containers experience delayed response times due to environmental packaging trapping gas or air, which can pose safety risks from leaks of low global warming potential (GWP) refrigerants.
Innovation Solution
A gas detector enclosure design with a printed circuit board (PCB) that isolates the gas detector element from the electronics, using a solid, unitary body to impede fluid flow and a spacer portion with a seal to expose the gas detector element to the exterior while keeping the electronics isolated, reducing trapped air and gas exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the gas detector element is exposed to the exterior environment for rapid gas detection, then the response time is reduced, but the electronics are exposed to environmental factors such as moisture and temperature extremes
Solution Approach 1:
The enclosure is divided into two distinct zones: an electronics housing area that is sealed and isolated from the environment, and a sensor area that is exposed to the exterior. The PCB acts as a partition wall between these zones, allowing the sensor to detect gases while the electronics remain protected from environmental factors such as moisture and temperature extremes.
2Reliability
If the electronics are isolated from the exterior environment, then the reliability of the electronics is improved, but the gas detection response time is delayed due to trapped air
Solution Approach 1:
The PCB serves as an intermediary structure that provides both protection and gas passage. It includes a solid unitary body that impedes fluid flow to protect electronics, while also incorporating a aperture that allows gas to pass through to the sensor. This mediator structure enables simultaneous achievement of electronics isolation and rapid gas detection.
3Object-affected harmful factors
If a solid unitary body is used to impede fluid flow and protect electronics, then the sealing effectiveness is improved, but the device complexity increases
Solution Approach 1:
The PCB combines multiple functions into a single integrated component: it serves as the circuit board for electronics, provides structural support for the enclosure, creates the sealing barrier against environmental factors, and incorporates the gas passage aperture. This merging of functions reduces the overall device complexity compared to using separate components for each function.
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 significantly reduces response times from 20 minutes to 1 minute, enabling faster safety warnings and mitigation in refrigeration systems by minimizing gas exposure to sensors and protecting electronics from environmental factors.
Implementation Method 1
Such gas detectors can include non-dispersive infrared (NDIR) technology and are used to determine concentrations of particular gases in a given atmosphere
Data Source
AI summary
A gas detector is provided and includes a gas detector element, electronics to interface with the gas detector element and an enclosure configured to expose the gas detector element to an exterior and to form an electronics housing area in which the electronics are disposed whereby the electronics are isolated from the exterior.