Temperature responsive indicators for process control instruments
First Claim
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1. A process transmitter comprising:
- a housing;
a sensor within the housing producing a sensor signal as a function of a process variable;
transmitter circuitry within the housing for producing an electrical output based on the sensor signal; and
a temperature responsive indicator visible from an exterior of the housing, the indicator being visually responsive to a temperature.
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Abstract
A process transmitter includes a temperature responsive indicator to indicate an operating condition of the process transmitter. The operating condition may represent a level of a sensed process variable or an operating temperature of the process transmitter.
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Citations
20 Claims
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1. A process transmitter comprising:
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a housing;
a sensor within the housing producing a sensor signal as a function of a process variable;
transmitter circuitry within the housing for producing an electrical output based on the sensor signal; and
a temperature responsive indicator visible from an exterior of the housing, the indicator being visually responsive to a temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A process transmitter for measuring a process variable, the process transmitter comprising:
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transmitter circuitry for producing an electrical output representative of a sensed process variable; and
a temperature responsive indicator responsive to heat produced as a function of the electrical output in order to provide a visual indication representative of the process variable. - View Dependent Claims (12, 13, 14, 15)
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16. A process transmitter for measuring a process variable, the process transmitter comprising:
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a sensing element for sensing the process variable;
transmitter circuitry for producing an output based on the sensed process variable;
a housing containing the transmitter circuitry and sensing element; and
a temperature responsive indicator positioned on the housing and responsive to a temperature of the process transmitter housing. - View Dependent Claims (17, 18, 19, 20)
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Specification