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  1. m777182

    Kiln Insulation

    Ceramic fibres (not asbestos fibers!) are exelent for your task. m777182
  2. m777182

    Making a regulated humidity chamber

    To check humidity sensors you do not need a very large chamber.I think that the idea of putting a pan on the bottom that contains salt and water, covered by a screen, is a good start. With different salts you can keep humidity in chamber in a range of about 10% to 95% r.h. A ventilator above the...
  3. m777182

    demin water specification

    Properties of demin water you can read in tables. I assume that saying "normal water" you understand potable water from a tap: it contains some salts (~ 20 mg/l) and dissolved gases and therefore conducts electricity to some extent contrary to demin water that is almost an insulator. Properties...
  4. m777182

    Sand monitoring during production

    If you would like to measure a proportion of solids in a liquid in a two phase flow then it is possible to use an inline density measuring device. If your basic liquid is constant then you can calibrate density as a function of solids content. Once I read a paper where a non contact measurement...
  5. m777182

    Pickup Velocity of Solids for Ventilation

    I am not sure if I understand your question correctly: if you want to remove particles then the fluid flow velocity should be higher then settling velocity of your dust. There are numerous empirical relations how to calculate it (Google on "fluidization").It dependes on particles diameter and...
  6. m777182

    compare matrix elements

    Sorry I cannot matlab but I would search for max (or min )element in both vectors. If not equal I would reject them or overwrite with zero. If equal, then transfer them into a new vector.Loop to the last element. m777182
  7. m777182

    Will this be an effective method for measuring blend time

    Once I read a paper describing same problem, but a contactless conductivity cell was employed instead of an acoustic sensor. They were using the same principle as the Coulter counter works on.It was claimed that it worked. m777182
  8. m777182

    Help with Anhydrous HF Process Design

    Contact www.ijs.si. They have been working with HF for decades. I think they will gladly give you some hints. m777182
  9. m777182

    Current to pneumatic signal transducer

    If you accept "modulation by hand" then a 1,5 V battery source in series with a rheostat 75-375 Ohms (neglecting the inner resistance of the battery) will produce a 4-20mA current through your transducer. Turning your rheostat up and down you "modulate" the signal. With a selector switch and...
  10. m777182

    Vapour Pressure over Water

    If at t=0 Tair>Twater then you will come to a solution making heat and mass balance for an adiabatic system and iterating to an equilibrium point. It is a good exercise for loop programming: you should develop all relevant water and air properties that you normaly read from tables (Perry,...)...
  11. m777182

    Accelerated Test Factors - not Semicon related

    Temperature accelerates chemical decomposition and its effect will be most easily detected on polymeric materials: isolation, printed boards,connectors, housing. There are instruments that measure changes of materials due to temperature changes (cycles). They actually measure the elastic modulus...
  12. m777182

    Carbon

    At my army service, ages ago, in the middle of nowhere, I was using tooth polish paste because it was available,you know...smile, boys... m777182
  13. m777182

    heat capacity

    Heat capacity of a medium is not the only property you are taking into account when choosing a heating medium. It would be too simple. Take a look into a heat transfer text. m777182
  14. m777182

    Ground loop interrupt pH electrodes

    A possible source of a ground loop problem has to do with the reference electrode input to the amplifier: this point is usually not at the ground potential, but is with a resistor of a few kOhms separated from the ground in the amplifier circuit side. On the other side, that is in the liquid...
  15. m777182

    Neutralizing HNO2 and HNO3 with caustic

    Yes, ChemBuddy, I am wrong. HNO2 is not as strong as I had in mind and it will make some buffering. So an titration experiment(s) is(are) needed. Thanks for correcting me. m777182
  16. m777182

    Neutralizing HNO2 and HNO3 with caustic

    HNO2 and HNO3 are both very strong monovalent acids. If you neutralize them with NaOH there will be no buffer action,the pH at equilibrium =7.You can simply calculate mols of both acids and add the same amount (in mols!) of NaOH. m777182
  17. m777182

    set "PID parameters" for power serie of y = 3E-40*x^18.94

    Your datapoints seem a part of a titration curve around the inflection poit.Can't you afford a trasformation y--->log(y) and get a (nearly) linear function log(y)=Ax+B? m777182
  18. m777182

    Thermic Fluid

    A friend of mine was using lead as a thermic fluid in one of his applications.He used an adapted welding trafo for heating. m777182
  19. m777182

    Protecting stored pumps

    I would fill them with a mixture of inert gases that is used for car tires to minimize oxidative processes. From outer side I would apply some moisture repelant spray here around known under trade name WD40. If no better suggestion this one is maybe a good one. m777182
  20. m777182

    Mixing Vessel Dimensions

    There are some other questions about your powder like size distribution,density etc. as well as about your liquid like density, viscosity...then you can talk further about an efficient mixer. A good way to input powder into a solution is a system with circulating the solution through an eductor...

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