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  1. MerlinKnight

    Gas flow rate at different pressures

    I now the flow of natural gas through an orifice will be the same on both sides with a little pressure differential. But if i have 900 PSIG at 4mmscfd measured upstream and the other side of the valve or orifice is attached to a pipe to atmosphere. Is the flow going to be higher on the pipe to...
  2. MerlinKnight

    air compressor

    Thank you both very much. Merlin Knight
  3. MerlinKnight

    air compressor

    I have an air compressure that is rated 35 scfm @ 175 psig. If i were to regulate it down to 20 psig how does this effect my scfm on the outlet of the regulator? What would be the max scfm with the compressor being able to keep up? Any Help would greatly be appreciated. Merlin Knight
  4. MerlinKnight

    Class 1 Div. 2 Wireless Ethernet

    Can't find the answer. I want to put a netgear wireless 802.11 router in a nema 4 enclosure. But i need to put an external antenna. Do i have to find a class 1 div. 2 wireless router? Do i have to find a Class 1 Div. 2 External antenna, which i can't find so far? Can i use a netgear with a...
  5. MerlinKnight

    TCP/IP routing 1 ip address

    I know that if you are given a DSL that has 1 ip addres available that you put a router on it and all the computers can reach the internet. The problem is i have a allen brabley PLC, computer and a analyzer all on ethernet. My DSL has only 1 ip address. How can i talk to each device from the...
  6. MerlinKnight

    Networking

    I am in need of splitting 3 pc's and 4 PLC's from a network. They had hooked them up to a corporate network. NOT SECURE. I can't shut down these systems and change ip addresses.They hook up through a switch before they go to a corporate networt. What i want to do is put a firewall up in between...
  7. MerlinKnight

    rslinx opc excel

    I have rslinx pro running on one pc. On another pc i have a excel spreedsheet that i would like to get data from the plc 500 in the field. I know that the cell in excel needs =application|topic!item if i am on that pc . So if i am on the computer without rslinx on it would it be =...
  8. MerlinKnight

    [b] 0-24 Vcc to 4-20 mA [/b]

    Try searching for a module call ACTION PAK signal conditioners and call the rep. I have used them in the past for other projects.
  9. MerlinKnight

    AB SLC serial comms, laptop

    Hello, I had the same problem. I found that dell has a laptop that has the rs232 port. I have the D800 series. Also A/B makes a USB to DH485 interface converter. It has worked great on the computers we have that don't have the serial port. Cat # 1747-UIC.
  10. MerlinKnight

    Trending in VB

    Hello CajunCenturion, I am wanting to make a trend that will trend temperature. On the right side it will have the temp range that i am wanting to make changable . Also , i would like to have a changable time constant at the bottom to be able to spread out the readings. Thank you, Merlin Knight
  11. MerlinKnight

    Trending in VB

    Hello, Does anyone know where i can get info or even better code for trending. I want to place a trend in my project for a variable but don't know where to start. Thank You, Merlin Knight
  12. MerlinKnight

    Don't understand this

    Hello Zeitghost, Yes it is. Just trying to understand how they are doing things in it. I believe that Johnwm is right though . It was probably converted from qbasic, not that i am complaining, still want to learn but i don't understand why this happened and there are other areas that do...
  13. MerlinKnight

    Don't understand this

    Hello, I am looking at some codes stepping through them trying to learn more about VB and how it works. I am following this code which i have learned alot from but i don't understand this part. Here is part of it: For C = 1 To d: DA$(C) = "": Next bypass2: TK3PicType.List2.AddItem tempA$...
  14. MerlinKnight

    siemens touchscreen MP270B virtual keypad

    Hello, I had to convert a tp-37 siemens touchscreen to a MP270B. Converting caused some problems with graphic and button size and text. Got that straight. The problem i am having know is the pop-up keypad does not stay in one place and it also likes to shrink. Does anyone know of a way to...
  15. MerlinKnight

    Touchscreen

    Hello, I would like to work with a LCD Touchscreen for a design i am working on. Does anyone know a good site to get one or circuit design to try. Thank You.
  16. MerlinKnight

    Amplify small pulse signal

    Thanks for the help. I will try the ad8361 chip. I did have it grounded to the circuit. I will also try the op-amp suggestion and any others i can get. Jim
  17. MerlinKnight

    PIC Chip Programming

    nornrich, Try this site. I learned alot from this guy. http://hobby_elec.piclist.com/e_menu.htm
  18. MerlinKnight

    Amplify small pulse signal

    1) what is an "ant wire" - antenna(?), which seems a bit unlikely as the highest frequency is only a few kHZ. The ant is just a paper clip at the moment. 2) Is the "-800mV to -1.4V" the signal on this "ant wire", or is it at the output of whatever circuit...
  19. MerlinKnight

    Amplify small pulse signal

    Hello, Could someone tell me how to amplify a neg sawtooth pulse. I want to pick up a pulse with an ant wire that varies from -800mv to -1.4v. The width between pulses is 16ms. Pulse width is 450us. I want to convert this to varying 0 to +5 volts. Any help would greatly be...
  20. MerlinKnight

    Switching led with PNP transistor

    Thank You jbartos Great site. Merlinknight

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