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Recent content by AGomaa

  1. AGomaa

    Valve Coefficient for a Back Pressure Valve

    Berenger, In addition to the valuable info that LittleInch provided, there are some fundamental issues that I would like to highlight: - If I understand your drawing correctly, your control loop that controls the vessel pressure consists of (transmitter/Controller/valve), although the valve...
  2. AGomaa

    PES vs. PLC vs. ESD

    Sometime the instrument tag (tag or prefix/suffix) can be used to distinguish the control system that the instrument is connected to. Sorry for the cut and paste error in my reply
  3. AGomaa

    PES vs. PLC vs. ESD

    Sometime the instrument tag can be used to distiSometime the instrument tag (tag or prefix/suffix) can be used to distinguish the control system that the instrument is connected tonguish
  4. AGomaa

    Blown PLC Outputs for bidirectional control valves

    I did application(s) for bag filters where the outputs for the solenoids are “on” for 80 ms and cycled each one or three minutes. I use interposing relays (normally 5 to 10 amps contact). All are running well for many years (I forget how many some six some ten) the PLC output card is a...
  5. AGomaa

    Pressure Transducer

    The diaphragm seal I mean is a separate diaphragm seal typically used for aggressive media (acids etc.) this is not the diaphragm in the transducer. A typical one is model 990.10. Normally you get the transducer and the diaphragm seal pre-installed and filled with seal. Check with WIKA they...
  6. AGomaa

    Pressure Transducer

    Hi, I would expect that you have a transducer with diaphragm seal, that there is a filling fluid between the transducer and the diaphragm. as such the diaphragm does not have this action (concave to convex). If not then it is better to use one who have a filling sealed fluid. Advise more...
  7. AGomaa

    Would this be a difficult PLC application?

    Just to add some of the Automationdirect micro PLC includes P&ID functions. However using separate PID controller will make your design much simpler. By the way most of PID uses analog output, I can not see one in your application. if it is for temperature control you may include an output from...
  8. AGomaa

    Rabbit MicroController to A2D

    Thanks itsmoked,zeitghost. What is your impression about Rabbit in general. I have been trying this communication but it never beend sccessful. The SPI is straight communication which I like. I am designing a product and I think it suits my application. You will find many guys who worked with...
  9. AGomaa

    Rabbit MicroController to A2D

    I’m trying to connect Rabbit Microcontroller 2200 to A2D of Analog AD7730. through SPI. Have any one tried this before?.
  10. AGomaa

    direct logic 405 questions

    Basically the 405 series came in three CPUs DL 430 (has no memory cartridge) DL440 should have any one of the following: EE, UV or CMOS cartridge, Only the CMOS has battery that maintain the ladder. DL450 has internal memory and/may or may not have memory cartridge as in 440 The UV and the EE...
  11. AGomaa

    Trying to find a PLC

    For such low voltage look for TC/Voltage input range you can find close range to yours, Automationdirect has a voltage input modules of 0-1.25 V input with 16 bit resolution. (F0-04THM) They have interfaces as well. search their web for full range. www.automationdirect.com
  12. AGomaa

    Selecting Process Controller

    Basically you are talking about two PID loops, with no logic involved. I prefer to go directly to sand alone controller, this is far easy to install and I think will be cheaper, you may check OMIGA as one of the cheap sources for controllers, You can find many vendors who provide one or two...
  13. AGomaa

    stop button and plc's

    In most of alarm signals you would prefer to use Normally Closed signal. because in addition to your alarm status if you have a cut in the wire you will have alarm. which will indicate that there is a problem in your system. using normally open contact for such application (with the cut wire)...
  14. AGomaa

    Flight Simulator PLC Control

    Another option you may think of is selecting a PLC CPU that does not run any program. With the I/O associated with it acts as external I/O to your PC application. So you will gain high speed and may be lower cost. A typical product is the Automationdirect H4-EBC , F3-OMUX-1, etc. (an RTU to your...
  15. AGomaa

    Flow meter....

    There are many types of instruments that can measure liquids flow rate. Orifice, turbine, PD, sonic, annubar, vortex, and many many types. To properly select a type, you shall define at least the following: 1- liquid name (cleanness, corrosive…) 2- Flow rate range, Pressure, Temp. viscosity, SG...
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