Magnetic flowmeter with built-in simulator
First Claim
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1. A magnetic flowmeter transmitter, comprising:
- a differential amplifier sensing an additive combination of actual flowmeter electrode outputs and simulated electrode outputs, the differential amplifier providing an additive amplifier output; and
a simulator that provides the simulated electrode outputs, the simulator sensing the additive amplifier output and providing an error indication when the additive amplifier output is outside a normal range.
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Abstract
A magnetic flowmeter transmitter includes a differential amplifier that senses an additive combination of actual flowmeter electrode outputs and simulated electrode outputs. The differential amplifier provides an additive amplifier output. A simulator provides the simulated electrode outputs. The simulator senses the additive amplifier output and provides an error indication when the additive amplifier output is outside a normal range.
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Citations
23 Claims
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1. A magnetic flowmeter transmitter, comprising:
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a differential amplifier sensing an additive combination of actual flowmeter electrode outputs and simulated electrode outputs, the differential amplifier providing an additive amplifier output; and
a simulator that provides the simulated electrode outputs, the simulator sensing the additive amplifier output and providing an error indication when the additive amplifier output is outside a normal range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of testing a magnetic flowmeter transmitter, comprising:
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providing simulated electrode outputs;
providing a differential amplifier sensing an additive combination of actual flowmeter electrode outputs and the simulated electrode outputs;
providing an additive amplifier output from the differential amplifier; and
sensing the additive amplifier output; and
providing an error indication when the additive amplifier output is outside a normal range. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 23)
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22. A magnetic flowmeter transmitter, comprising:
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a first amplifier having first and second inputs, the first input coupling to a first flowtube electrode contact;
a second amplifier having third and fourth inputs, the third input coupling to a second flowtube electrode contact; and
a simulator that provides simulated electrode outputs to the second and fourth inputs, the simulator sensing a response to the simulated electrode outputs and providing an error indication when the sensed response is outside a normal range.
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Specification