Mar
10

Flow Control – Positive Displacement Pump Part 1

Positive Displacement Pump Curve

Positive displacement pumps may be used when it is necessary address flow requirements of 2GPM or less. The pump design ( e.g. vane, gear, peristaltic) selected for a particular application should be based on properties of the liquid and the expected operating condition. One characteristic of a positive displacement pump is that when it is …

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Mar
03

Flow Control – Centrifugal Pump

Flow Control Using Centrifugal Pump

Centrifugal pumps can be used to transfer large volumes of liquid between vessels in an industrial process. When a constant speed motor is used to drive the pump then the pump flow rate may be controlled by adjusting a throttling valve that is installed after the pump discharge, as illustrated below. The pump discharge pressure …

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Feb
24

Wireless Control – ACC 2014

The 2014 American Control Conference, ACC, will be held Wednesday through Friday, June 4 – 6, at the Hilton Portland & Executive Tower, Portland, OR. As noted on the conference web site, the ACC is internationally recognized as a premier scientific and engineering conference dedicated to the advancement of control theory and practice. Last year …

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Feb
17

High Speed Wireless Control

I was recently sent a link to a YouTube video of a control demonstration by professor Raffaello D’Andrea, The Institute for Dynamic Systems and Control at ETH, Swiss Federal Institute of Technology, Zurich. ETH is one of the world’s leading universities for technology and the natural sciences. I found the demonstration by Professor D’Andrea to …

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Feb
10

The Changing Web

Blevins YouTube

It is quite easy to upload and store a power point presentation as a Slideshare file on the Slideshare web site. Once a presentation is uploaded in this manner then it may be viewed by anyone through the Slideshare web site. In addition, the Slideshare web site includes tools that that allow an audio recording …

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Feb
03

WirelessHART – Monitoring and Control of On-Off Valves

TopWorx_4310

A number of WirelessHART devices have been introduced over the last few years to monitor the status of on/off valves. For example, the TopWorx 4310 WirelessHART Valve Position Monitor can be used detect linear and rotary movement using non-contact technology with limit switch feedback. Such devices provide a low cost way to monitor the position …

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Jan
27

WirelessHART – Level Switch

2160 WirelessHART Transmitter

In many tank level control applications, a level switch is installed and used as an interlock to help prevent overfilling the tank. For example, in many existing installations you may find a vibrating fork liquid level switch wired as an input to the control system. However, today it is possible to reduce the cost of installing a …

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Jan
20

WirelessHART – Discrete Measurement

702 Transmitter

Many manufacturers initially introduced WirelessHART field devices that were designed to support continuous process measurements such pressure, flow, temperature, and level. Also, WirelessHART transmitters are now available for analytical measurements such as pH. Recently you may have noticed that some manufacturers have introduced WirelessHART field devices for discrete measurement. For example, Rosemount has released the …

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Jan
06

Finding a Patent

Patent Office

When exploring a new area of technology, it is often helpful to find out what patents have been granted or are pending. The patent office allows anyone to explore the patent office database free of charge. A quick search capability is provide that allows you to easily find out what patent have been granted to …

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Dec
30

Emerson Exchange 2013 – Workshop Videos

Emerson Exchange Video

Emerson Exchange was held this year at the Gaylord Texan Hotel and Convention Center, Grapevine, TX on Sept 30th – Oct 4th, 2013. Over 350 workshops were hosted over a three day period. In addition, on the last day of Emerson Exchange, a small number of Meet the Expert workshops were presented. This year the …

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