Intrinsically safe field maintenance tool with power islands
First Claim
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1. A hand held configurator for coupling to a two wire process control loop for use in configuring and monitoring field units coupled to the two wire process control loop, comprising:
- a power supply;
loop coupling circuitry configured to couple to the two wire process control loop;
at least two power islands configured to electrically isolate electrical components in one power island from electrical components in another power island;
independent power connections between each power island and the power supply; and
a series resistor electrically connecting two power islands to limit energy transfer therebetween.
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Abstract
A hand held configuration for coupling to a two wire process control loop for use in configuring and monitoring field units coupled to the two wire process control loop is provided which includes a power supply, and at least two power islands. The power islands are configured to electrically isolate electrical components in one power island from electrical components in another power island. Independent power connections are provided between each power island and the power supply.
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Citations
20 Claims
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1. A hand held configurator for coupling to a two wire process control loop for use in configuring and monitoring field units coupled to the two wire process control loop, comprising:
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a power supply;
loop coupling circuitry configured to couple to the two wire process control loop;
at least two power islands configured to electrically isolate electrical components in one power island from electrical components in another power island;
independent power connections between each power island and the power supply; and
a series resistor electrically connecting two power islands to limit energy transfer therebetween. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification