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AutoQuiz: What Is the Application for an Impulse Line in Fluid Flow?

The post AutoQuiz: What Is the Application for an Impulse Line in Fluid Flow? first appeared on the ISA Interchange blog site.

AutoQuiz is edited by Joel Don, ISA’s community manager.

Today’s automation industry quiz question comes from the ISA Certified Control Systems Technician (CCST) program. Certified Control System Technicians calibrate, document, troubleshoot, and repair/replace instrumentation for systems that measure and control level, temperature, pressure, flow, and other process variables. Click this link for information about the CCST program. This question comes from the Level I study guide, Domain 3, Troubleshooting. Level I represents a professional who has a five-year total of education, training, and/or experience.

Impulse lines are used with:

a) head meters
b) magnetic flowmeters
c) positive displacement meters
d) open channel meters
e) none of the above


<span class="collapseomatic " id="id8561" tabindex="0" title="Click Here to Reveal the Answer” >Click Here to Reveal the Answer

The head meter we refer to here is a flowmeter that uses head (pressure) as a parameter in measuring the fluid flow.

Impulse lines (sensing lines) connect the process to the pressure transmitter, at a distance, so as to reduce the effect of ambient temperature on the transmitter’s operability and life span. Vibration and accessibility are other reasons for locating the transmitter away from the process.

The key to nailing this question is to know that head is the same as pressure, that impulse lines work in pressure related measurements, and that the other three meters don’t use pressure as part of their scheme.

The correct answer is A.

Source: ISA News