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  • Users: driga
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  1. driga

    Temperature sensor and heater and how to control it.

    @rhatcher Please see the attached figure, what would be the different between the two configurations? Current connection is the power pads while voltage sensing is the instrumentation pad according to your term. Exactly, I would like to measure the thin film heater temperature and not the fluid...
  2. driga

    Temperature sensor and heater and how to control it.

    @rhatcher Ok what kind of instrument? so if I measure voltage, then I need to do calculation to find out the resistance?
  3. driga

    Temperature sensor and heater and how to control it.

    First of all thank you for the reply, @davidbeach: What do you mean by four-wire connections? Can you explain on this or maybe give me a link so I can read it myself? @DRWeig I do not know yet. How does the two parameters (voltage type and its magnitude) affect my temperature measurement and...
  4. driga

    Temperature sensor and heater and how to control it.

    Dear all, I am new in instrumentation and control so hopefully I can get some answer or hints in solving my problem. I am planning to use Indium Tin-Oxide (ITO) as heater. I am also would like to control the heater by checking the surface temperature of the heater using the fact that the...
  5. driga

    Heating element

    Hello all, I am looking for a heating element to be used in a channel flow. Until now, there are several alternatives, but I still have a hard time to decide. The requirement are as follow: 1. Capable of creating a constant temperature as well as constant heat flux boundary condition. 2. If...
  6. driga

    Question about joule heating (multi terminal)

    Well that is because what I would try to achieve. So far for constant temperature condition, I use a copper plate, and it is heated using water flow from thermostat. What I would like to try is having a constant temperature condition instead of constant heat flux for electric heater.
  7. driga

    Question about joule heating (multi terminal)

    I want to make things clearer so I made new modification on the previous figure. So i have divided the plate into 5 zones, each zone has two electrodes (positive and negatives). Each zone has independent source of electricity, right? When you said center strip, do you mean the part shown by...
  8. driga

    Question about joule heating (multi terminal)

    Would be like this? (see attachment). If it is correct then it would be quite difficult in accessing the middle heater. And what do you like think would be the best for the control circuit? Where should I...
  9. driga

    Question about joule heating (multi terminal)

    Thanks IRstuff for such an insight discussion. I have one difficulty to understand your sketch is where the silver beads need to be positioned? Since I do not want to to take much of the space with the cost of losing optical access. That is the reason I would like to use ITO to have a...
  10. driga

    Question about joule heating (multi terminal)

    I see.. Is there any simple calculation to prove that the arrangement will ensure a uniform temperature?? So basically based on your sketch, there will be two positive and two negative poles, right? What do you think with this top arrangement (see attachment)? Will it gives the same effect as...
  11. driga

    Question about joule heating (multi terminal)

    I am sorry but I am not quite understand by moving the middle electrode outward. Lets say, from the first picture the electrode at the left most is number 1 followed by number 2, 3 and number 4 will at the right side. Which one needs to be move outward? The other thing is what do you mean by...
  12. driga

    Question about joule heating (multi terminal)

    Yes, the area needs to be heated is the top surface only. The one coated with ITO and silver beads. The glass window will be placed on a channel. I do not need the temperature uniformity within the glass part as well, just the surface of the ITO and silver beads.
  13. driga

    Question about joule heating (multi terminal)

    It is not a plan view, it is a front view. I have added top view, hopefully it is more understandable now. Do you think there still be non uniformity? The grey area is ITO coating. The stripes are silver...
  14. driga

    Question about joule heating (multi terminal)

    What do you mean by circumferential non uniformity in temperature? The idea is since on top of surface there is a convective heat transfer, I might need less heat flux at the downstream. So that I can have uniform temperature along the flat surface (longitudinal).
  15. driga

    Question about joule heating (multi terminal)

    Hello all, I would like to heat a surface using Joule heating principle. The picture is shown in attachment. The top surface of the glass body is coated with ITO and silver beads to connect it with electric source. With my arrangement is it possible to independently control the heat flux at...
  16. driga

    Calculating the needed height for reservoir

    It is a peristaltic pump. It does not come with a dampener. It has been there before I come and I have to use it. The pump can generate 1.3 bar to 3 bars (depends on the tube). I know it might need a pulsation damper because of the pump is a positive displacement pump, is there anything wrong...
  17. driga

    Calculating the needed height for reservoir

    Hi all, I have a system as shown in the schematic (see attachement). The reference height is z=0, number 1 and 3 are reservoir. The use of upper reservoir (nr. 1) is to damp the pulsation of the pump. I want to calculate the height so that the flow rate inside my channel (nr. 2) is according...
  18. driga

    Looking for a suitable pump

    The pump manufacturer said that the peristaltic pump that we have right can generate up to 2.5 bars. So the head is round about 25 meters. My task is to test the pump first. The system consists of reservoir (slightly above the pump's inlet, about 40 cm). The outlet of reservoir is 3/4" inch...
  19. driga

    Looking for a suitable pump

    Ok, could you give the link for the diaphragm pump? Is it possible that our peristaltic pump cannot generate enough pressure due to lack of power from the electric motor?`
  20. driga

    Looking for a suitable pump

    The maximum flow rate range from 50-70 l/min.

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