from the Automation List department...Control Valve Cycle Measurement
How to measure the control valve cycles?
By Gerald Beaudoin on 27 August, 2014 - 1:43 pm -
Sure would appreciate any points of view on this one..... Cheers Gerald Beaudoin...
from the PLC Control department...PID Control using FB41 for Siemens S7-300 PLC
I am an undergraduate student who is currently trying to program a Siemens S7-300 PLC (CPU 313) for PID control using FB 41. Where can I find more examples and more details on how to use FB41. There is none inside the Siemens PID control manual for the FB41. What are the important parameters that need to be configured?
By Jan Steen Nielsen on 27 August, 2014 - 12:19 pm -
Hello Amir Ovcina (and others) I have made an all-in-one PID-Controller (FB121) and many other...
from the Instrumentation and Control department...Calculating Pressure Transmitter Range
How can we test Rangeability of Pressure Transmitter?
The word 'Turndown' is used in two ways. One use of the word turndown is to define how far a...
By Kamaraj on 27 August, 2014 - 1:14 am -
Dear Mr.David, In your Last Post you wrote that At 7 bar pressure, the reading could be 6.65...
The term in "FSO" in your spec means (percent) of full scale uncertainty. My selection...
By Kamaraj on 25 August, 2014 - 3:56 am -
Dear Mr.David, what you have wrote about NaK pressure Transmitter is Correct. My Ke2 model...
By Kamaraj on 25 August, 2014 - 3:23 am -
Dear Mr.Ashiq, NaK filled transmitter is pressure transmitter used for high temperature...
A colleague informed me that an NaK transmitter is a pressure transmitter with a local fill fluid...
The definition you found is a correct definition of rangeability. I have no idea what a NaK...
By Kamaraj on 23 August, 2014 - 12:54 am -
Hello Mr. Ashiq, Thanks for your information.. The transmitter output is 4-20mA only. when...
what is the output of this transmitter? suppose its output is 04-20 mA than zero and span would...
from the Forum department...Hot Air Dryer Supply / Exhaust Air Handling
Supply and exhaust air handling control method evaluation.
from the Eurotherm 3504 department...Controller Watch Dog and Output Loop Failure Detection
Challenges with achieving the processor watchdog and output loop failure functionality with Eurotherm 3504.
Thanks for your reply. I am currently working on the design....
By Curt Wuollet on 23 August, 2014 - 11:45 am -
Those are fairly easy to code around with most processors. An external time delay relay that you...
from the Data Export department...Exporting Ovation Point Data over a serial link using an OPC Server
Viability of exporting DCS (Ovation) data to a third party over a wireless (serial) link using OPC server.
Dear Sarmad At our CCPP output from DCS is given to AB PLC and through SCADA. we send &...
By Arif Shuja on 25 August, 2014 - 6:59 am -
Sarmad, Were you able to get a solution for your requirement? Regards, Arif > Thanks....
from the I&C department...Solatron flow computer Corrected volumetric flow
re-configure Solatron 7951 flow computer.
Dear Mr. JMW Thanks for your information yes i am trying to configure via the front panel...
By JMW on 23 August, 2014 - 11:37 am -
> corrected volumetric flow calculation from indicated volumetric flow in solatrom flow computer...
from the South Facing Wall department...0 - 10v Sensor Output Spikes or Dips Periodically
0-10v sensor output not as stable as I'd like
from the Forum department...Lime slurry density meter
We are trying to measure density of our lime slurry which approx 22% solids
By JMW on 23 August, 2014 - 11:22 am -
Vibrating element density is a good approach for slurries but care to be taken over the % and the...
from the instrumentation department...solartron 7915 flow computer
solartron flowcomputer 7915 showing error message bad ram checksum error, but it is working normal, printer is continuous writing, bad checksum error.
By JMW on 23 August, 2014 - 10:33 am -
Suggest you contact Les Hancock support engineer of Emerson. You can find him on linkedin and he...
from the Forum department...Westinghouse WDPF System
What kind of processor is the Westinghouse WDPF and what is its intended use?
Did you get any information about WDPF systems migration? > I am writing my bachelor thesis...
from the Chemical Engineering department...PI Controller on a Reactive Distillation Column
Tuning a PI controller for a dynamic reactive distillation column model.
from the Heads, flows, pumps & motors combined department...Pipe sizing for fluids and pump/motor selection
How do you select pipe size, metal as well as corresponding pump type with motors for process industry?
By Bob Peterson on 20 August, 2014 - 11:04 pm -
There are well known formulas for determining pressure drop across valves and thru piping and...
from the Forum department...Chain & gearbox selection for factory automation
Selection process for gearboxes & chain for conveyors & packaging machines
from the OSI vs. Aspen department...OSI Pi versus Aspen Info Plus 21
Chemical company with batch processes has to decide if they buy Aspen tech or OSI.
By Chetan Patel on 20 August, 2014 - 3:27 am -
go for GE Proficy Historian, Best in solution and pricing as well.......
from the Forum department...PX_VIB_GAIN in Mark V
how PX_VIB_GAIN in mark V works?
By John on 19 August, 2014 - 11:10 pm -
I was on-site and had a look at this. The gain change was NOT a function of speed as the machine...
Perhaps GE has set the gain to vary with shaft rotative speed to create a sort-of parametric...
from the Instrumentation and Control department...Replacing a Ball Valve with a Different Control Valve
how can we replace mechanically ball valve into electric or pneumatic valve?
By d on 19 August, 2014 - 1:30 pm -
few possibilities, you need to replace the valve, or at least contact the manufacturer of the...
from the Forum department...Control Valve Position Command Signal
Looking for a device that generate control valve position signal for open loop control
the correct terminology is Remote/Local for the Setpoint Adjustments Auto/Man for automatic...
I think Roy got it - manual station. I thought almost any PID controller had an auto/manual or...
I believe you are looking for a Manual Loading Station, I haven't seen one for years. If you are...
By d on 18 August, 2014 - 3:21 pm -
just put your controller in manual and adjust the output > I need to manipulate a control...
This post of mine is not related to my other post about the integrating actuator TM-55. Sorry for...
Gary, If you are wanting to "...manipulate [the integrating] control valve's...
from the Operation department...Lube oil temperature and bearing vibration
Is there any correlation between lube oil temperature and bearing vibration?
By Christopher on 19 August, 2014 - 8:19 am -
Check if you changed the OIL PUMP (attached to the turbine axis) during your last shut down. If you...
from the Mechanical department...Atomizing air cooler modification
Atomizing Air Cooler Modification
> Power Saved in kWhr = (Main AA Comp Power rating in kWhr)*(Turbine running hours) > This...
Izhar, Power Saved in kWhr = (Main AA Comp Power rating in kWhr)*(Turbine running hours) This...
Izhar, What are each of the columns in the data? I see "GT," "Fr,"...
CSA/SB Thanks a lot for your inputs. CSA I really appreciate your responses. I am really sorry,...
from the Instrumentation and Control department...Understanding Run Back in Burner Management System
What is Run Back in a Boiler Operation?
from the Forum department...Difference Between Mark V Type 'A' or 'B' Panel
What is the difference between a Mark V type 'A' and a type 'B' Panel? Can you tell by looking at it?
MPAC, No; one can't tell from looking at the outside of the panel, or even by opening the doors...
from the urgent department...Honeywell DCS & ESD Load Calculation
CPU load calculation for control modules (in C300).
from the Automation List department...What Constitutes a Cycle for Preventative Maintenance Purposes?
A manufacturer of a valve and actuator specs the life at 2 million cycles and defines a cycle as 0-90 % movement. If a valve sits all day oscillating around 50-60, what constitutes a cycle for preventative maintenance purposes?
from the Forum department...Questions about Designing a Gas Processing Plant - student project
I need advice about a gas processing plant I'm trying to design, as an exercise.
Computer programmers do it byte by byte