Short videos are great ways to show how to perform an activity, such as calibrating a valve’s actuator to move the valve stem based on the 4-20mA signal it receives from the control system. In this under 5-minute “how-to” video, Emerson’s Alex Quah Shu Min demonstrates the setup and calibration procedure for the Fisher 3582i […]
I wanted to share a quick question and answer in an email exchange in case you may have a similar question sometime down the road. The original question was: The Project is about installing two manual Fisher control valves but we want to modify it to include obtaining feedback positions back to the Control Room. […]
In the Process Control LinkedIn group, a question was asked: Positioners seem very popular now, but most lines with valves have flow meters attached. Won’t a flow loop make the positioner redundant? When asked for clarification, the original poster explained: As far as I understand them, a positioner simply moves the stem to a particular […]
Unless your plant or production facilities was recently built, chances are that your process has a mix of automatic and manual control. A common area for manual control are on-off valves used in many general purpose applications such as tank filling and emptying, filter backwash and blowback, and sequencing operations to name a few. In […]
You may have seen the news of the 2013 HART Plant of the Year noting: HART technology has helped reduce production downtime related to control valve failures… We use the HART signal to monitor real time valve conditions which has helped with identifying problems before they could cause unplanned events. This reliability effort combined with […]
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