Take a peak inside a recent Stromquist & Company controls class. In this video Matt from Stromquist & Company will walk you through what you need to know about industrial grade single loop controllers. Find out why the Honeywell UDC3200 universal single loop controller is the best selling and best valued controller in the marketplace, and the UDC 2500 controller is the high limit controller that industry chooses when burner safety is critical. Matt teaches us about different types of input and output signals. Want to know the difference between a 4-20ma and a 2-10 and why people choose one over the other? How about upscale and downscale burnout? What thermocouple should you use? What is the thermocouple health feature that Honeywell offers? Should I use it? Check out this training video to get the answers to these and other questions.
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3 Responses
dear sir
i just want a eason behind selection of 4-20 ma not 5-21 ma or other or 3-19 ma as all will give us a difference of 16 ma
is its just a conicidence like why we use 110 or 230 v as Ac supply .
since during my serach and interview for one of the job this question was asked so i said 4-20 ma is used because of live zero and to avoid noise problems ,but it made me shut to the question 5-21 mA?
is theer any reason behind it or just a range selected ?
2.also is theer any good reference to understand the real logic or what exactly osi layesr works or being used by the protocol or the development people.
Thank you so much for your question, and for checking out controltrends. The reason most people use 4-20 ma or 0-10v is because most end devices, like valve or damper actuators are already set up to go from full open to full close ( span) between 4-20 or 0-10v. This makes it easy to span your actuator. That being said you could set your span up for any control signal between either 4-12 ma or 0-10v, for example one manufacturer of actuators has their actuators stroke between 6-9 v.
I hope this answers your question. Thanks again for your comment.
but sir it can also goes from full open to full close in range of 5 to 21 or any other?