Heating cable control and monitoring method and system
First Claim
1. A method for monitoring at least one parameter in a structure having power lines, the method comprising the steps of:
- disposing a plurality of addressable remote terminals throughout the structure;
sensing a parameter and applying signals representative of the parameter to the plurality of remote terminals;
bi-directionally transmitting data corresponding to the sensed parameter from each remote terminal over a network including the power lines by spread spectrum transmission to at least one addressable main controller and transmitting data from the at least one addressable main controller to the plurality of addressable remote terminals over the network including the power line by spread spectrum transmission.
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Abstract
A method and system for controlling heating cables wherein a plurality of two-conductor heating cables are disposed in contact with heatable vessels to heat the vessels. Power lines having at least two conductors are connected to the heating cables through a plurality of first switches. Each first switch is responsive to a control signal for selectively connecting and disconnecting one heating cable to and from the power lines. Each of a plurality of remote terminals is connected to the two conductors of a heating cable and detects the temperature of the heatable vessel heated by the heating cable. At least one main controller for controlling a plurality of first switches is connected to two of the power line conductors. Temperature data relating to temperatures detected by the temperature sensors is transmitted from the remote terminals over the heating cables and the power lines by spread spectrum data transmission to the main controller. A plurality of control signals is produced as a function of the temperature data and is applied by the main controller to the first switches.
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Citations
9 Claims
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1. A method for monitoring at least one parameter in a structure having power lines, the method comprising the steps of:
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disposing a plurality of addressable remote terminals throughout the structure; sensing a parameter and applying signals representative of the parameter to the plurality of remote terminals; bi-directionally transmitting data corresponding to the sensed parameter from each remote terminal over a network including the power lines by spread spectrum transmission to at least one addressable main controller and transmitting data from the at least one addressable main controller to the plurality of addressable remote terminals over the network including the power line by spread spectrum transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification