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E271T
Understanding 4 to 20 mA Loops (Timed & Monitored)

David A. Snyder, PE

This course familiarizes the reader with the uses and limitations of 4 to 20 mA current loops, which are used in the majority of analog input and analog output loops in almost every industrial facility. This course is written in a simple, easy-to-understand format, uses basic math calculations, and includes more than 80 illustrations and dozens of examples. This course shows how process parameters such as temperature, pressure, level, and flow are represented by 4 to 20 mA analog input signals and how a modulating valve’s liquid flow coefficient (Cv) is controlled by 4 to 20 mA analog output signals for quick-opening, linear, and equal-percentage modulating control valves. This course also describes how one measured parameter, such as pressure, can be used to infer another parameter, such as level or flow.

This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of the course materials.


User's Guide to Timed & Monitored Online Courses:

For Timed & Monitored (T&M) online courses, you need to log into your account to view the course content. You must complete the required study time (min. 50 minutes for each PDH) before you can submit your quiz answers and obtain your certificate of completion. However, you may print out the quiz questions anytime after purchase.

You do not need to complete the T&M course in one sitting. You may view the course content from office or home using different devices with Internet connection. Our website will keep track of your total time spent. If necessary, you may print the course content for ease of reading while you are online. You may also preview the content of E271T by viewing the content of E271 since they are identical.

For T&M courses, You need to actively view course content online - at least click your mouse once in a while. The on-screen tracking clock may stop due to inactivity at your end. If that happens, you may resume your clock by pressing F5 key on your keyboard or by refreshing your screen. Thank you for your cooperation.

Note: This course requires users to pay first before viewing the course content.

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NY PE & PLS: You must choose courses that are technical in nature or related to matters of laws and ethics contributing to the health and welfare of the public. NY Board does not accept courses related to office management, risk management, leadership, marketing, accounting, financial planning, real estate, and basic CAD. Specific course topics that are on the borderline and are not acceptable by the NY Board have been noted under the course description on our website.

AIA Members: You must take the courses listed under the category "AIA/CES Registered Courses" if you want us to report your Learning Units (LUs) to AIA/CES. If you take courses not registered with AIA/CES, you need to report the earned Learning Units (not qualified for HSW credits) using Self Report Form provided by AIA/CES.

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