Infrared Power Control for Explosion-Proof Field Devices
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Solution Overview
Problem
Field devices with wireless communication units are typically shipped and stored without power to prevent battery drain and unauthorized radio emissions, but this requires users to manually insert batteries into pressure-resistant, explosion-proof containers, which is inconvenient and increases safety risks during installation in hazardous environments.
Innovation Solution
Incorporating an external interface unit with an infrared communication device and a power controller that allows remote control of the battery power supply through an infrared interface, enabling the user to start or stop power without opening the container, thus preventing radio emissions during transport and optimizing battery usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If field devices are shipped without batteries installed, then battery drain and unauthorized radio emissions are prevented, but manual battery insertion is required which increases safety risks and inconvenience during installation in hazardous environments
Solution Approach 1:
The battery is pre-installed in the field device during manufacturing, but the power supply is kept in an off state. This preliminary action allows the device to be prepared in advance without activating the battery, thus preventing battery drain and unauthorized radio emissions during transport and storage. The power can then be activated later through a safe remote operation without requiring manual battery insertion at the installation site.
2Device complexity
If manual battery insertion is required, then power control is simple, but personnel expenses and safety hazards increase due to opening pressure-resistant containers in hazardous environments
Solution Approach 1:
The manual mechanical operation of opening the pressure-resistant container and inserting the battery is replaced by an automated electronic power control system. The power controller receives activation signals through communication interfaces (such as infrared or wireless communication) and automatically switches the power supply on without requiring physical access to the container. This substitution eliminates the need for personnel to open containers in hazardous environments, reducing safety risks and improving installation efficiency.
3Ease of operation
If power is activated immediately after battery installation, then the device is ready for use, but unnecessary battery consumption occurs during transport and storage
Solution Approach 1:
The power supply state is made dynamic and controllable, transitioning from a static always-on or always-off state to a dynamically adjustable state. The power controller can switch between on and off states based on operational requirements, allowing the device to be transported with the power off (saving battery) and activated only when needed at the installation site. This dynamic control optimizes battery usage while ensuring device readiness when required.
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
Enables safe and convenient transportation and installation of field devices with pre-installed batteries, reducing personnel expenses and safety hazards by allowing controlled power activation at the site, while avoiding unnecessary battery consumption and compliance with radio regulations.
Implementation Method 1
an external interface unit configured to receive a setting signal for starting or stopping supply of power from the battery through an infrared interface
Data Source
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AI summary
There is provided a field device activated by a battery and housed in a pressure-resistant and explosion-proof container. The device includes: an external interface unit comprising: an infrared communication unit configured to communicate with an external infrared communication device through a window attached to the container; and a display unit configured to display status information about the field device; and a power controller configured to determine whether power from the battery should be switched on or off, in response to a request from the external interface unit.