Spark testing apparatus

A technology of equipment, electric sparks, used in mechanical equipment, mining equipment, preventing sparks, etc.
CN104620116AInactive Publication Date: 2015-05-13CMTE DEV LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CMTE DEV LTD
Publication Date
2015-05-13
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a method and apparatus for electronically testing the safety of sources of energy such as electrical circuits, in explosive atmospheres such as high risk mining situations, using an electronic spark tester (EST) in place of the known mechanical spark test apparatus (STA). The EST typically uses an analogue subsystem (5) and a digital subsystem (6) connected by a digital to analogue converter (7) and an analogue to digital connector (8) to apply a simulated spark load to the energy source and measure the time varying current response to that load.
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Description

technical field

[0001] The present invention relates to a spark test apparatus and is specifically designed not only for assessing the safety of energy sources used in high risk mining situations. Background technique

[0002] There are many situations where an explosive atmosphere exists and there is a safety risk if these gases come into contact with an energy source (such as an explosion from eg an electrical circuit). The concept of "intrinsic safety" is also considered as a method of instrument protection in this explosive atmosphere. Protection is achieved by designing the energy source so that it cannot produce an explosive spark. This is achieved by limiting the power that the source can provide either always or when a false start is detected.

[0003] In the past, energy sources with simple electrical characteristics have been shown to be intrinsically safe based solely on these characteristics through the use of evaluation curves. However, many devices have more...

Claims

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