Today’s automation industry quiz question comes from the ISA Certified Automation Professional certification program. ISA CAP certification provides a non-biased, third-party, objective assessment and confirmation of an automation professional’s skills. The CAP exam is focused on direction, definition, design, development/application, deployment, documentation, and support of systems, software, and equipment used in control systems, manufacturing information systems, systems integration, and operational consulting. Click this link for information about the CAP program. This question is from the CAP study guide, Performance Domain III, System Design. Definition: Design, specify, and procure the hardware/software used in the system.
To measure the level of a liquid with a dielectric constant greater than 2 in a horizontal vessel with changing composition and temperature, the device with the best reproducibility is a:
a) radar level detector
b) ultrasonic level detector
c) capacitance level detector
d) differential pressure transmitter
e) none of the above