Wireless Measurement Transmitter Segmented Housing for Safe Service
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Solution Overview
Problem
Existing wireless measurement transmitters face challenges in industrial environments due to exposure of electronics to explosive or corrosive atmospheres during circuit setting or battery replacement, requiring additional safety measures like disconnecting from the process and removing to a safe area.
Innovation Solution
A wireless measurement transmitter design with a housing assembly featuring a sealed first cavity for the measurement circuit assembly and a replaceable module with a primary battery and service communication connector, allowing service operations without exposing the electronics to the environment, using a dual-cover system and a service communication connector accessible by removing the second cover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the wireless measurement transmitter cover is removed to perform circuit settings or battery replacement, then service operations can be performed, but the measurement electronics are exposed to the atmosphere resulting in degradation or damage to electronics, or risk of electrical spark in explosive atmosphere
Solution Approach 1:
The housing is divided into separate sealed compartments: a first sealed compartment containing the measurement circuit assembly and a second compartment for the replaceable module. This segmentation allows the measurement electronics to remain sealed and protected while service operations are performed on the replaceable module through a service port, eliminating the need to expose the entire device to the environment.
Solution Approach 2:
A service communication connector is provided as an intermediary interface that allows external service equipment to communicate with the measurement circuit assembly through the sealed housing. This mediator enables circuit settings to be performed remotely without opening the sealed compartment, thus protecting the electronics from environmental exposure while maintaining service accessibility.
2Ease of repair
If the wireless measurement transmitter cover is removed to replace the primary battery, then battery replacement can be performed, but there is risk of electrical spark in explosive atmosphere
Solution Approach 1:
The transmitter is segmented into a sealed measurement circuit compartment and a separate replaceable module compartment. The replaceable module containing the battery can be exchanged through a service port without opening the sealed compartment, allowing battery replacement without exposing the measurement electronics to explosive atmospheres.
Solution Approach 2:
The battery and its associated replaceable module are extracted as a separate serviceable component that can be replaced independently through the service port. This extraction allows the hazardous battery replacement operation to be performed without compromising the sealed, explosion-proof integrity of the measurement electronics compartment.
3Reliability
If existing measurement transmitters require disconnecting from the process and removing to a safe area for service operations, then safety is maintained, but productivity is reduced due to additional steps and time required
Solution Approach 1:
The transmitter is designed with a service port and replaceable module that enable on-site service operations without requiring removal from the process. The sealed housing with integrated service access allows technicians to perform battery replacement and circuit settings in place, making the device self-sufficient and eliminating the need to disconnect and relocate to safe areas.
Solution Approach 2:
The housing is pre-configured with a sealed first compartment for measurement electronics and a second compartment for the replaceable module, along with a service port for accessing the replaceable module. This preliminary structural arrangement enables safe in-place service operations, eliminating the need for subsequent removal and relocation steps.
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A measurement transmitter (100) includes a main housing body (102B) with a first cavity (104) closed by a first cover (102A) and a second cavity (106) closed by a second cover (102C). A measurement circuit assembly in the first cavity (104) includes power and service communication conductors (112) that extend through the main housing body (102B) to contacts (116) in the second cavity (106). A replaceable module (120) plugs into the contacts (116) in the second cavity (106) and includes a primary battery (150) and a service communication connector (122). The service communication connector (122) is exposed for connection to service equipment by removal of the second cover (102C).