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  1. HSWSac

    Pressure drop alarm

    Those switches at grainger would be just the ticket for you. If you got a 40-60 PSI switch, it would turn ON when the pressure drops below 40 PSI, and back OFF when the pressure gets back up to 60 PSI and above. Usually you can adjust those set points. You want a range like that, so that when it...
  2. HSWSac

    proximity sensors

    I've had good luck with the Allen Bradley ultra-sonic sensors.
  3. HSWSac

    Modulated Interlock Loop Safety Curcuit....

    If you wanted it super simple and wanted the 555, then generate your square wave with the 555, and pump the signal and loop back into the inputs of simple chip with an exclusive or gate (XOR). The output of the chip can trigger a relay or transistor if the signals don't match. (!XOR means they...
  4. HSWSac

    Maple Silver 520 OIT to Modicon address?

    In defense of Maple systems, I have found their tech support people to be very helpful and outgoing. Too bad he wasn't able to help you out... I can't either, I'm sure there's someone here though that can. Good luck!
  5. HSWSac

    SLC 5/05 help

    So, what was it?
  6. HSWSac

    distance between comm cables and power cables

    Being that you're in WA state, look closely at your state codes. My little experience with WA, their state electrical codes were far stricter than what's common in other places.
  7. HSWSac

    Extension .LAD file

    Telepace uses the .lad extension, but it's Control Microsystems: http://controlmicrosystems.com/products/software-tools/programming-tools/
  8. HSWSac

    Mysterious relay in water telemtery panel / SCADA

    I'd be curious how the conversion from 4-20 to PWM is done. Is it a single relay module that does it?
  9. HSWSac

    Verifying the stiffness of a pipe, Al vs. Steel

    DamRonB, Your idea about the foam is an interesting one!!! I would want to try it, simply out of curiosity!!! I went to one site today and braced one of the aluminum poles in a non-ideal, but aesthetic way which we think should be sufficient. Ideally, guy wires would probably work the best...
  10. HSWSac

    Verifying the stiffness of a pipe, Al vs. Steel

    DamRonB, We're against guys, if not just for the looks of it. Build a nice pole for the customer, then have to guy it... grrr... I have a plan to brace the poles with threaded rod anchored and tensioned to the edge of the foundation. It's not a lot of angle, I know, but I have a feeling it...
  11. HSWSac

    Verifying the stiffness of a pipe, Al vs. Steel

    This is all very helpful. The main advantage to the Al pole was the corrosion and the weight. We didn't have problems with the steel poles, other than they were heavy and it's hard to get things galvanized in CA. In comparison, I figure a 4" Sch 40 Al pole will weight about 75 lbs, where our...
  12. HSWSac

    Verifying the stiffness of a pipe, Al vs. Steel

    So, that's interesting. Though the 6061 would be less rigid, it'd have a higher yield strength. You're assumption about our poles is correct, the pole seems plenty strong enough, but the swaying isn't great for the long term on the equipment. Though the equipment can handle it just fine, I...
  13. HSWSac

    Verifying the stiffness of a pipe, Al vs. Steel

    DanRonB, The weights in the table were from an Al pipe chart. That was just copy and pasting a chart, so since I didn't need it for the IE calculation, I didn't bother adding the steel values. I'm going to try to attach an image of the newly constructed pole to this post. Yes, pole is welded...
  14. HSWSac

    Verifying the stiffness of a pipe, Al vs. Steel

    Thanks. That's helpful. I thought the cantilever equation would be useful, as to illustrate the stiffness in a practical example. I'm not sure, though, that the equation I found takes into account the weight of the cantilever itself, but I figured for a vertical pole, it may not matter (except...
  15. HSWSac

    Verifying the stiffness of a pipe, Al vs. Steel

    Here's the table as a JPG.. .might be easier to view. http://files.engineering.com/getfile.aspx?folder=2279aed5-b718-4ccb-8617-017508be3d0d&file=pipe.jpg
  16. HSWSac

    Verifying the stiffness of a pipe, Al vs. Steel

    First off, I'm not a Structural Engineer, but I'm an electrical engineer and we install equipment on poles. We recently changed our pole design from Steel to Aluminum and found a drastic difference in stiffness. After researching the numbers, I believe I've found the info I'm looking for. If I...

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