Home | Control Global
WEBControl Global features news and analysis of process control and automation technology to help managers and engineers maintain and optimize systems for today's process industries.
Top 50 Automation Companies of 2021: Green Muscles In
WEBNov 8, 2022 · The automation marketplace proved its resilience again in 2021 and returned to pre-pandemic levels. Despite advances in project engineering that reduced cycle times, automation projects in general are still long-cycle projects, and the overall market for systems took longer to recover than some of the more product-oriented and discrete automation businesses.
Back to Basics: Understanding how ultrasonic continuous level ...
WEBAug 7, 2013 · Ultrasonic level sensors work by the "time of flight" principle using the speed of sound. The sensor emits a high-frequency pulse, generally in the 20 kHz to 200 kHz range, and then listens for the echo. The pulse is transmitted in …
Capacity control of reciprocating compressors
WEBJul 20, 2016 · The capacity increments are 100%, 75%, 50%, 25% or 0%. At 100%, both cylinder suction valves and the clearance pocket are closed. At 75%, only the clearance pocket is open. At 50%, only one cylinder suction valve is open during the discharge stroke. At 25%, one-cylinder suction valve and the clearance pocket are open.
How valve failure modes interact with controller actions and …
WEBDec 9, 2021 · Loop Control Distributed Control PLCs & PACs SCADA Multivariable Control Industrial Computers AI & ML. Manipulate. Motors Valves Actuators Drives. Visualize. HMI Operator Interface Alarm Management Recorders Data Acquisition Mobile Access. Network. Wireless Industrial Networks I/O Systems Power Supplies Remote Access. Manage.
Dos and don'ts of control room design | Control Global
WEBApr 26, 2019 · A control room that has no room for future expansion of people or equipment. Control rooms with poor lighting, leading to employee complaints and higher rates of absenteeism. Noisy, congested control rooms with sub-optimal workflow adjacencies. Delays in design and construction schedules required to address changes.
Controllers: Direct vs. reverse-acting control - Control Global
WEBMar 14, 2014 · A: Direct action means that the controller output rises if the measurement increases. Indirect (reverse) action means that the controller output drops when the measurement rises. A: Not quite right. The control valve failure action (and sometimes the valve positioner action) is also relevant.
Instrument index insights - Control Global
WEBMay 4, 2021 · The index provides a device count for the prospective contractor bid proposals. After bid awards, it can also be used to track device scope additions, deletions and changes. This has proven to be successful, especially on large projects, in evaluating contractor work-order change requests.
Signal filtering: Why and how - Control Global
WEBJul 24, 2019 · Greg McMillan. Filtering is the modification of a measured or calculated signal—using an algorithm and/or logic—to remove undesirable aspects of the signal before it is used in a calculation or a controller. Examples in control are the feedback (or controlled) variable to a PID or APC controller, or the input to a feedforward controller.
Ways to improve split-range control - Control Global
WEBAug 6, 2019 · For tight control at the setpoint, overlap the transition point. For example, the cooling valve can remain open from 0-51% of output, and the heating valve can start opening at 49% through to 100%. You lose a little efficiency between 49% and 51%, but ensure a smoother transition.