Recent content by mhlimon

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  1. M

    Ovation Redundant Drop CPU Failed Mode

    Dear all, Recently in our Emerson 3.5.1 ovation system, a redundant drop-54 CPU is found to be failed mode. We tried to 'Clear' and 'Load' the CPU, but following error came out 'Drop-54 is unavailable and can not be cleared'. We have tried to reboot the controller by switching power On/Off...
  2. M

    H2S Gas Detector

    As the range is 0 - 100 ppm, it would be best if you calibrate the full range with a 100 ppm cylinder. However, if your measurable range is lower, you can calibrate it with a lower range like 0-50ppm with a 50ppm cylinder. This is my opinion.
  3. M

    Education and school info - where did you learn?

    Quite an interesting career. Your suggestions are valuable. I am working in a power plant for three and half years after graduating with a BSc degree in EE. I worked for 2 years in electrical maintenance and later moved to the I&C field. Currently, I am in the learning phase. However, networking...
  4. M

    Calibration Acceptance range and tolerance limit

    I am working at a power plant under a ISO certified company. We have standard calibration procedure and calibration record sheet. During last ISO audit, Bureau Veritus auditor wanted to know why there is no tolerance limit or acceptable error not mentioned in our sheet. Our plant is a big...
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