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Control.com topic...
Engineering
Posted by OZI Guy on 30 October, 2014 - 5:37 pm
Is there a published work about expected maximum uncertainty if the recommended straight run for an orifice plate flow measurement is not observed?
Topic: Continuous process industries, DCS questions.
from the Forum department...
Blockage in Impulse Lines/ Filling Glycol
Originally posted by Nasser on 30 October, 2014 - 3:23 am
What is the best practice when you have blockage in impulse lines for flow transmitter how can clear the blockage?
what is the best equipment to fill glycol in level dp cell in both H & L sides?
New Replies:
Hopefully blockage isn't a problem, but to properly fill most d/p systems you need the proper...
Some forum threads on purging impulse lines: Purge with pneumatic differential relays ...
First off, the impulse lines should NEVER incur any blockage. So let's address what is causing the...
Topic: Engineering and workplace issues.
from the Instrumentation department...
Why shield should be at one end in cabinets
Originally posted by Sudheer on 13 July, 2013 - 10:38 am
When instrument shield connection to ground, why connect at one end of the cable, especially internal cables?
New Replies:
d, > The electricians only wire what is on the drawing and more than a few engineers have...
The electricians only wire what is on the drawing and more than a few engineers have made grounding...
Agreed. However it needs to be understood that the foil wrap on a single twisted pair is conductive...
You can do whatever you want with your shields:^). The idea behind grounding one end only is that...
Srbg, What you are describing is entirely possible--and would be correct as long as the shield...
Thanks for the info. I am particularly interested in why cannot we make our shield continuous...
Topic: Information resources, documentation.
from the Forum department...
Instrument Learning Materials?
Originally posted by Dave on 30 October, 2014 - 7:54 am
New instrument engineer, could use some help!
New Replies:
Automation Direct is a web based vendor of PLCs and associated components and controls. They...
Hi, Dave, First of all, let me say I've been lax in reading other non-turbine control...
Topic: Engineering and workplace issues.
from the None department...
convert 4-20mA to 0-5volt!
Originally posted by leyla on 19 August, 2002 - 3:52 am
I want to convert 4-20mA (from a sensor) to 0-5Volt, but I don't know how...
New Replies:
very useful thank you very much...
Topic: Power generation equipment control.
from the Power generation department...
Generator and Capacitor Bank
Originally posted by fluidflow on 22 July, 2014 - 1:04 am
Totally stumped by the recent brawl over utility of capacitor bank in power generation.
New Replies:
Some useful information. Take care G.Rajesh...
FF... Please play particular attention to Candl_Pete's excellent post. He was able to illustrate...
FF, further to my earlier post, see the following Control.Com thread: ...
FF, problem is clearer. Following is a summary, based on information provided to date: A)...
FluidFlow... Do you want me to answer you directly, via control.com, or both? Phil...
Dear Phil On the undermentioned thread, discussion had taken place earlier but no conclusion...
Dear Phil, I have send you the single line diagram via email. Subject: Fluidflow sending...
FluidFlow... can you send me a simple Single-Line-Diagram (or hand-drawn sketch) that relates how...
Hello Phil, The problem or dilemma is still persisting. Senior Manager is telling that...
Topic: Engineering and workplace issues.
from the Forum department...
Grounding Current Transformers
Originally posted by gautam on 29 October, 2014 - 1:17 am
Need for grounding of secondary terminal of current transformer.
New Replies:
Gautam... Q1: The ground-terminal protects endangerment of human life if there is a...
It serves several purposes, one being safety in case of an insulation breakdown. Since the...
Topic: Engineering and workplace issues.
from the ELECTRICAL/INSTRUMENTATION department...
Why IRP Used for Interface Between DCS and MCC
Posted by VINNY on 29 October, 2014 - 12:50 am
Why is an IRP panel is used between DCS and MCC?
Posted by Josh on 28 October, 2014 - 11:58 pm
The consequence to run cathodic protection DC cable and instrument cable (most 24 VDC) cable in same cable tray.
Topic: Engineering and workplace issues.
from the INSTRUMENT department...
Grounding Problem in Siemens DCS
Originally posted by RAJESH on 26 October, 2014 - 4:50 pm
In DCS panel the resistance measured between power earth and signal earth vary from 24 ohm to 160 ohm in different panels.
New Replies:
My apologies, I see now that I misread your post. You should not have that much resistance...
You need to be specific not only with the resistance magnitudes you describe but also how you are...
> resistance between power earth and signal earth is varying from 40 ohm to 120 ohm. It...
Resistance from cabinet instrument ground to ground connection in earthing pit 100-200 milliohms. ...
Topic: Engineering and workplace issues.
from the Automation Safety department...
AB or Siemens Equivalent Safety Product as Sick's Flexi-Loop
Originally posted by Weida on 23 September, 2014 - 11:49 am
Is there any Allen Bradley or Siemens safety product that has similar modular capbilities as Sick's Flexi-Loop system?
New Replies:
Looking forward to reading more. Great article. Much thanks again. Much obliged....
Topic: Information resources, documentation.
from the Forum department...
Electric Motor Driven Actuator
Originally posted by Qasem on 26 October, 2014 - 8:10 am
Actuated valve in remote location where no instrument air availability.
New Replies:
what is the valve controlling/modulating? There are many options. Rexa has options that are all...
Lots to choose from: http://tinyurl.com/pgakocf...
Topic: Sensor technologies.
from the Forum department...
Flow Measurement Using Load Cells
Originally posted by Juan Pardo on 24 October, 2014 - 5:20 pm
Measuring the flow coming out of a vessel using only a load cell to control a valve.
New Replies:
That method (loss of weight, flow measurement) is not often used in automatic control. It...
Originally posted by Phantush on 21 October, 2014 - 3:28 pm
Convert RMS voltage to Analog signal + Per Unit
New Replies:
You need a signal conditioner module to produce a useable signal for PLC (4-20mA) and to isolate...
The sine wave input is to be read in from a PLC....
If I'm reading you right you want to measure the Peak Voltage. Use a diode and capacitor to...
Topic: Continuous process industries, DCS questions.
from the Instrumentation department...
Instrument Control Loop
Originally posted by Waqar Ahmed on 26 June, 2014 - 3:18 am
Maintenance procedure of process control loop.
New Replies:
As posted by dave, something must have changed. Besides hardware (valve) problems, there could be a...
Originally posted by Rich on 21 October, 2014 - 3:28 pm
Looking for feedback on flow meters and flow computers from Flow Technology Inc
New Replies:
Also...while looking at outputs, if intrinsically safe operation is an issue, you should look for...
If it operates as just a flow meter and totalizer, presumably it operates unattended. Someone just...
Topic: Engineering and workplace issues.
from the eng department...
Standard Recipes Designation ID
Posted by Gustavo Borda on 22 October, 2014 - 4:28 pm
Is there any rule to designate a process recipes (IDs)?
Topic: Engineering and workplace issues.
from the Automation List department...
Why is current transformer secondary short circuited?
Originally posted by Anonymous on 6 June, 2007 - 11:47 pm
Why is current transformer secondary short circuited during the operation?
New Replies:
why voltage not high when we short the C.T secondary side? Pls explain with principle....
Topic: Engineering and workplace issues.
from the Instrumentation department...
Control Valve Fail Action
Posted by xyz on 21 October, 2014 - 6:28 pm
control valve fail action discussion
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