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  • Users: danw2
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  1. danw2

    what happened to the controls engineering and the instrumentation fora?

    what happened to the controls engineering and the instrumentation fora?
  2. danw2

    RIP Skogsgurra, Gunnar Englund

    It grieves me to report that Gunnar Englund died on June 14, 2021 only weeks after getting a diagnosis of cancer. He was a frequent contributor to this forum and wrote columns for the Swedish trade journal Electronik i Norden, which has published a eulogy at the link below. A Google translation...
  3. danw2

    The Chemical Safety Board has relea

    The Chemical Safety Board has released an updated animated video on or about the 15th anniversary of the BP Texas City refinery 2005 explosion and fire. An ad for CSB's forthcomin interactive training application takes up the first 40 odd seconds of the video. The animated narrative starts...
  4. danw2

    Explosion Proof RTD's

    I must have missed a previous thread, RTD's Intrinsically Safe, Link Just found it in a search. (Keith) >Never seen an ExP RTD before. Seems likely to lag the poor thing horridly. I could see them wanting to change out ExP for two reasons. One would be having to run the requisite thick-wall...
  5. danw2

    cruise ship rams ship and dock in Venice

    Link "MSC Cruises blamed a mechanical problem on its ship, which can carry over 2,675 passengers in 1,071 cabins, as it tried to dock in the Giudecca Canal." Another firmware issue?
  6. danw2

    Animated video of reboiler explosion (June, 2013) is on-line

    US Chemical Safety Board's 12 minute, animated streaming video of the Williams Olefins Plant Explosion and Fire, Geismar LA, June 13, 2013 is at
  7. danw2

    Schematics for Transmation 1045 milliamp calibrator

    After an 8 year search, thread698-166703, I finally found schematics for my Transmation 1045 milliamp calibrator. A jpg scan of each of the two schematics is attached...
  8. danw2

    Monitoring 'grounds' in DC power bus

    Monitoring 'grounds' in a DC power bus. I'm trying to figure out how to SCADA-ize an antique chart recorder in a steel mill (from a distance, I've not been there yet to look and see) that indicates "grounds" on a DC bus system used for powering cranes. My issue is how to transducer-ize the...
  9. danw2

    wall mount 24Vdc 200mA power supply

    Banner Engineering had a totally enclosed, wall mount 24Vdc 200mA power supply that was ideal for many instrumentation apps - it mounted easily with its wall mount flange or you could screw a DIN rail adapter to it. But it's been discontinued. I'm not aware of another brand/model that is...
  10. danw2

    Sick UM30 - Interpreting the Teutonic alphabet

    The spec and wiring diagram are for a Sick UM30 ultrasonic distance sensor. The wiring is Teutonic, and I'm not sure what the alphabet translates to. I suspect - L+ is 12-30VDC+ supply but - NC ? ? the binary switching output ? - M ? ? - QA ? ? Siemens uses Q for output. A for...
  11. danw2

    Sense a railcar

    A train of railcars, consisting of a locomotive and 100+ rail cars pass a station point. The train moves at 3mph (~5km/hr). A sensor is needed for detection of the passing of the engine, the gaps between the rail cars, and presence of a coal car. The surrounding atmosphere is filled with coal...
  12. danw2

    RIP: Rob's Fieldbus Reference List, formerly on Compuserve

    It seems that the world's most comprehensive list of fieldbuses (with links), formerly on Compuserve at http://ourworld-top.cs.com/rahulsebos/ has disappeared. Google's cached pages for the former site are merely Compuserve's Good-bye message: Has anyone encountered is list of hundreds of...
  13. danw2

    Why does ethernet not have common mode/noise problems?

    Why does ethernet appear to be such an easy plug & play imlementation that avoids the hassles of RS-485 with grounding, biasing, termination, common mode & noise? I've torn my hair out over the years with local RS-485 networks that aren't any longer than 100m in length, that have had all...
  14. danw2

    Where to buy strain relief?

    I want to put strain reliefs on some power tools that need replacement power cords. I'd like to get something like: I couldn't find anything in Newark or Digikey. This is twosie threesie buy. Anyone know of source? Dan
  15. danw2

    residential submersible pump

    A precipitous drop in the house water pressure sent me to check the pressure on the bladder tank - only 20 psi on system with a pressure switch set for 30-50 psi. I clamped an ammeter on one of the pump wires at the breaker and its running continuously @ 7A, like it should since it hasn't...
  16. danw2

    camera adapter for Tektronix scope

    I was looking around for a camera adapter for my 484 analog storage scope. One can find oodles of Tek brand Polaroid camera/film adapters for Tektronix scopes on eBay. Does anyone know if there were commercial adapters for 35mm or other cameras? Dan
  17. danw2

    VSWR for testing 900Mhz freq hopper antenna & cable

    Our plant has a small network of 4 frequency hopping, 900Mhz, 1 watt, unlicensed ISM band, serial data radios (tlaking Modbus) whose performance seems to be degrading over the past 2 years, as evidenced by an increasing number of time-outs and failed responses. The system worked flawlessly for...
  18. danw2

    schematic for Transmation 1045 milliamp calibrator

    Anyone have a schematic for the Transmation 1045 milliamp calibrator? In the old file cabinet, maybe? Dan
  19. danw2

    Valve Positioner History

    Somehow I've missed this history forum entirely, until today. While I can't offer an answer to Jim Casey's query (thread769-114295) as to who first offered a valve positioner, an ISA article probably sheds some light on the time frame for such. The ISA article dated August 1, 2003 entitled...
  20. danw2

    vintage HP 1640 serial data analyzer

    Anyone here old enough to have used an HP 1640 serial data analyzer? There's one I can borrow from the widow of a former work colleague, but she lives 1500 miles away, knows nothing about the device, and it would be a hassle for her to ship it to me, if it isn't what I can use. I need to...

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